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• Server Fault Wiki: How does Subnetting Work?

  - by Kyle Brandt

  How does Subnetting Work, and How do you do it by hand or in your head? Can someone explain both conceptually and with several examples? Server Fault gets lots of subnetting homework questions, so we could use an answer to point them to on Server Fault itself. If I have a network, how do I figure out how to split it up? If I am given a netmask, how do I know what the network Range is for it? Sometimes there is a slash followed by a number, what is that number? Sometimes there is a subnet mask, but also a wildcard mask, they seem like the same thing but they are different? Someone mentioned something about knowing binary for this? Not looking for links to other sites (unless maybe you have one post with a bunch of good ones). I already know how to subnet, I just thought it would be nice if Server Fault had a generic subnetting answer.

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• /lib/i386-linux-gnu/libc.so.6 causing segmentation fault & session crash

  - by Fred Zimmerman

  I am having repeated and frequent crashes ending session whenever I take certain actions such as loading gmail under Chrome. Oddly, the same is not happening when I go to gmail under Chrome. After rooting around in /var/logs it appears to me that he trigger is something to do with libc.so.6 (see below). How can I fix this? 23936.947] [ 23936.947] Backtrace: [ 23936.948] 0: /usr/bin/X (xorg_backtrace+0x49) [0xb7745089] [ 23936.948] 1: /usr/bin/X (0xb75bf000+0x189d7a) [0xb7748d7a] [ 23936.948] 2: (vdso) (__kernel_rt_sigreturn+0x0) [0xb759c40c] [ 23936.948] 3: /usr/bin/X (0xb75bf000+0xfade7) [0xb76b9de7] [ 23936.948] 4: /usr/bin/X (ValidatePicture+0x1d) [0xb76bcb8d] [ 23936.949] 5: /usr/bin/X (CompositePicture+0xc3) [0xb76bcc83] [ 23936.949] 6: /usr/lib/xorg/modules/drivers/intel_drv.so (0xb6f18000+0xcf542) [0xb6fe7542] [ 23936.949] 7: /usr/bin/X (0xb75bf000+0x10b1d7) [0xb76ca1d7] [ 23936.949] 8: /usr/bin/X (CompositeGlyphs+0xc4) [0xb76b6d84] [ 23936.949] 9: /usr/bin/X (0xb75bf000+0x104956) [0xb76c3956] [ 23936.949] 10: /usr/bin/X (0xb75bf000+0xfe6f1) [0xb76bd6f1] [ 23936.949] 11: /usr/bin/X (0xb75bf000+0x3798d) [0xb75f698d] [ 23936.949] 12: /usr/bin/X (0xb75bf000+0x253ba) [0xb75e43ba] **[ 23936.950] 13: /lib/i386-linux-gnu/libc.so.6 (__libc_start_main+0xf3) [0xb721d4d3] [ 23936.950] 14: /usr/bin/X (0xb75bf000+0x256f9) [0xb75e46f9] [ 23936.950] [ 23936.950] Segmentation fault at address 0x155 [ 23936.950] Caught signal 11 (Segmentation fault). Server aborting [ 23936.950] Please consult the The X.Org Fou**ndation support at http://wiki.x.org for help. [ 23936.950] Please also check the log file at "/var/log/Xorg.0.log" for additional information.

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• Bladecenter-E Power Module fault

  - by Lihnjo

  We have problem on IBM Bladecenter-E Critical Events Power module 2 is off. DC fault. Power module 4 is off. DC fault. Warnings and System Events Insufficient chassis power to support redundancy What is the best solution for this problem? Thanks AMM Service Data Help SPAPP Capture Available 10/13/2010 17:03:47 1090347 bytes Time: 11/19/2012 11:02:31 UUID: 42E1 5D2F D7BF 41A6 A4A2 48D1 3FB7 0540 MAC Address xx:xx:xx:xx:xx:xx MM Information Name: nnnnn Contact: aaa, bbb, ccc, England Location: [email protected] IP address: 111.222.333.444 Date Time Information GMT offset: +1:00 - Central Europe Time (Western Europe, Algeria, Nigeria, Angola) Adjust for DST: Yes NTP: Enabled NTP Hostname/IP: 111.222.333.444 System Health: Critical System Status Summary One or more monitored parameters are abnormal. Critical Events Power module 2 is off. DC fault. Power module 4 is off. DC fault. Warnings and System Events Insufficient chassis power to support redundancy CHASSIS (BladeCenter-E) in CHASSIS slot: 01 TopoPath is "CHASSIS[1]". Description : BladeCenter-E Width : 1 Sub Type : BladeCenter (BC) Power Mode : 220 v KVM Owner : CHASSIS[1]/BLADE[9] MT Owner : CHASSIS[1]/MGMT_MOD[1] Component Type : CHASSIS Inventory: VPD ID: 336 (decimal) POS ID EXT: 0 (decimal) POS ID: 8 (decimal) Machine Type/Model: 86773RG Machine Serial Number: 99ZL816 Part Number: 39R8561 FRU Number: 39R8563 FRU Serial Number: YK109174W1HV Manufacturer ID: IBM Hardware Revision: 3 (decimal) Manufacture Date: 18 (wk), 07 (yr) UUID: 42E1 5D2F D7BF 41A6 A4A2 48D1 3FB7 0540 (hex) Type Code: 97 (decimal) Sub-type Code: 0 (decimal) IANA Num: 336 (decimal) Product ID: 8 (decimal) Manufacturer Sub ID: FOXC Enviroment data: -------------- Type: : POWER_USAGE Unit: : WATTS Reading: : 0xa Sensor Label: : Midplane Sensor ID: : 0x0 MGMT MOD (Advanced Management Module) in MGMT_MOD slot: 01 TopoPath is "CHASSIS[1]/MGMT_MOD[1]". Description : Advanced Management Module Name : kant Width : 1 Component Role : Primary Component Type : MGMT MOD Insert Time : 28050132 Inventory: VPD ID: 288 (decimal) POS ID EXT: 0 (decimal) POS ID: 4 (decimal) Part Number: 39Y9659 FRU Number: 39Y9661 FRU Serial Number: YK11836CE2RC Manufacturer ID: IBM Hardware Revision: 4 (decimal) Manufacture Date: 50 (wk), 06 (yr) UUID: 1D95 9937 8CA5 11DB 9499 0014 5EDF 1C98 (hex) Type Code: 81 (decimal) Sub-type Code: 1 (decimal) IANA Num: 20301 (decimal) Product ID: 65 (decimal) Manufacturer Sub ID: ASUS Firmware data: Type : AMM firmware Build ID : BPET50P File Name : CNETCMUS.PKT Release Date : 03/26/2010 Release Level : 50 Revision - Major: 80 Port info: ======================================================== Topology Path ID : 1 Label : External Phy Orientation : EXTERNAL Port Number : 1 Type : MGT Physical Meidum : Copper Number of Link Intferfaces : 1 ------------------------------------ Link Ifc ID Number : 1 Link Ifc Transport Protocol : ENET Link Ifc Addr Type : MAC Link Ifc Burned-in Addr : xx:xx:xx:xx:xx:xx Link Ifc Admin Addr : 00:00:00:00:00:00 Link Ifc Addr in use : xx:xx:xx:xx:xx:xx ---------------------------------------------------------- Configuration behaviors: Save Only Enviroment data: -------------- Type: : TEMPERATURE Unit: : DEGREES_C Reading: : 38.00 Sensor Label: : MM Ambient Sensor ID: : 0x0 -------------- Type: : VOLTAGE Unit: : VOLTS Reading: : +4.81 Sensor Label: : +5V Sensor ID: : 0x1b -------------- Type: : VOLTAGE Unit: : VOLTS Reading: : +3.26 Sensor Label: : +3.3V Sensor ID: : 0x19 -------------- Type: : VOLTAGE Unit: : VOLTS Reading: : +11.97 Sensor Label: : +12V Sensor ID: : 0x16 -------------- Type: : VOLTAGE Unit: : VOLTS Reading: : -4.88 Sensor Label: : -5V Sensor ID: : 0x1e -------------- Type: : VOLTAGE Unit: : VOLTS Reading: : +2.47 Sensor Label: : +2.5V Sensor ID: : 0x18 -------------- Type: : VOLTAGE Unit: : VOLTS Reading: : +1.76 Sensor Label: : +1.8V Sensor ID: : 0x15 -------------- Type: : POWER_USAGE Unit: : WATTS Reading: : 0x19 Sensor Label: : kant Sensor ID: : 0x0

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• What can cause a segmentation fault (11) in apache2 after activating ssl

  - by MadMaxAPP

  Configuration is as follows: OpenSuse 12.1 minimal installation 64 bit ISPConfig 3.0.4.6 Everything runs smooth but if I activate SSL for apache2, the web server becomes unavailable. The log (error.log) fills with always the same segmentation fault error message (around 20 times a second) [notice] child pid 9178 exit signal Segmentation fault (11) ... What is the best way to find what causes the problem?

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• Ubuntu 13.10 installation fault

  - by macphisto1983

  I'm trying to install Ubuntu 13.10 64bit on my notebook, but after a few second the installation quit, i have to take screenshot with my phone, i saw an error: MMIO write of 0x00000000 write fault at 0x418880 [IBUS]![enter image description here][1] My notebook is Asus n56vv with Optimus intel + nvidia gt750m At now I have a working installation of Ubuntu 13.04, I just want to install Ubuntu 13.10, keeping my home folder, I also tried to try ubuntu, but I have the same issue and the system didn't load.

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• Fault Contract in WCF with learning video

  This article will give basic introduction on how to handle exception at service side, how to use fault contract at service side and how to handle service exception at client side.

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• IWAB0399E Error in generating Java from WSDL: java.io.IOException: ERROR: Missing <soap:fault> elem

  - by DanO

  I have a WCF 4.0 service for internal use. Another team is trying to consume it in Java. IWAB0399E Error in generating Java from WSDL: java.io.IOException: ERROR: Missing <soap:fault> element inFault "PasswordReuseFaultFault" ... One source suggests it may be a Soap 1.1 vs. Soap 1.2 issue Indeed my WCF generated WSDL <wsdl:fault name="PasswordReuseFaultFault"> <wsp:PolicyReference URI="#blah_blah_blah_PasswordReuseFaultFault_Fault"/> <soap12:fault name="PasswordReuseFaultFault" use="literal"/> </wsdl:fault> notice the <soap12:fault>instead of the expected <soap:fault> I'm pretty sure that is the cause of the problem. How do I get WCF to generate soap 1.1 WSDL ? or What should I tell the Java team to do so their tools can understand the newer protocol?

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• Apache HTTPD - Segmentation fault when loading mod_jk module

  - by hansengel

  I just set up mod_jk with my Apache httpd 2.0.52 installation, but now when I try to start Apache, it has a segmentation fault. I've checked that I am using the mod_jk compiled for 2.0.x.. built against the same version I have, in fact. I've also verified that the path I'm giving to LoadModule is correct, and the permissions and the ownership of the file are the same as the rest of the modules'. When I remove the "LoadModule" command for mod_jk from my httpd.conf, there is no segmentation fault. Nothing shows in Apache's error logs. I have tried restarting the server with this module using both service httpd restart and httpd. These are the last few lines returned of strace httpd -X: gettimeofday({1292100295, 434487}, NULL) = 0 socket(PF_INET6, SOCK_STREAM, IPPROTO_IP) = -1 EAFNOSUPPORT (Address family not supported by protocol) socket(PF_NETLINK, SOCK_RAW, 0) = 3 bind(3, {sa_family=AF_NETLINK, pid=0, groups=00000000}, 12) = 0 getsockname(3, {sa_family=AF_NETLINK, pid=22378, groups=00000000}, [12]) = 0 time(NULL) = 1292100295 sendto(3, "\24\0\0\0\26\0\1\3\307\342\3M\0\0\0\0\0\305\333\267", 20, 0, {sa_family=AF_NETLINK, pid=0, groups=00000000}, 12) = 20 recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"<\0\0\0\24\0\2\0\307\342\3MjW\0\0\2\10\200\376\1\0\0\0"..., 4096}], msg_controllen=0, msg_flags=0}, 0) = 664 recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"\24\0\0\0\3\0\2\0\307\342\3MjW\0\0\0\0\0\0\1\0\0\0\10\0"..., 4096}], msg_controllen=0, msg_flags=0}, 0) = 20 close(3) = 0 socket(PF_INET, SOCK_STREAM, IPPROTO_IP) = 3 --- SIGSEGV (Segmentation fault) @ 0 (0) --- +++ killed by SIGSEGV +++ Process 22378 detached Has anyone had a similar problem using Apache 2.0.52 with mod_jk? I might try downloading and building the source for the Apache server and mod_jk myself if there isn't a discovered fix for this.

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• Apache HTTPD - Segmentation fault when loading mod_jk module

  - by Hans Engel

  I just set up mod_jk with my Apache httpd 2.0.52 installation, but now when I try to start Apache, it has a segmentation fault. I've checked that I am using the mod_jk compiled for 2.0.x.. built against the same version I have, in fact. I've also verified that the path I'm giving to LoadModule is correct, and the permissions and the ownership of the file are the same as the rest of the modules'. When I remove the "LoadModule" command for mod_jk from my httpd.conf, there is no segmentation fault. Nothing shows in Apache's error logs. I have tried restarting the server with this module using both service httpd restart and httpd. These are the last few lines returned of strace httpd -X: gettimeofday({1292100295, 434487}, NULL) = 0 socket(PF_INET6, SOCK_STREAM, IPPROTO_IP) = -1 EAFNOSUPPORT (Address family not supported by protocol) socket(PF_NETLINK, SOCK_RAW, 0) = 3 bind(3, {sa_family=AF_NETLINK, pid=0, groups=00000000}, 12) = 0 getsockname(3, {sa_family=AF_NETLINK, pid=22378, groups=00000000}, [12]) = 0 time(NULL) = 1292100295 sendto(3, "\24\0\0\0\26\0\1\3\307\342\3M\0\0\0\0\0\305\333\267", 20, 0, {sa_family=AF_NETLINK, pid=0, groups=00000000}, 12) = 20 recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"<\0\0\0\24\0\2\0\307\342\3MjW\0\0\2\10\200\376\1\0\0\0"..., 4096}], msg_controllen=0, msg_flags=0}, 0) = 664 recvmsg(3, {msg_name(12)={sa_family=AF_NETLINK, pid=0, groups=00000000}, msg_iov(1)=[{"\24\0\0\0\3\0\2\0\307\342\3MjW\0\0\0\0\0\0\1\0\0\0\10\0"..., 4096}], msg_controllen=0, msg_flags=0}, 0) = 20 close(3) = 0 socket(PF_INET, SOCK_STREAM, IPPROTO_IP) = 3 --- SIGSEGV (Segmentation fault) @ 0 (0) --- +++ killed by SIGSEGV +++ Process 22378 detached Has anyone had a similar problem using Apache 2.0.52 with mod_jk? I might try downloading and building the source for the Apache server and mod_jk myself if there isn't a discovered fix for this.

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• I get a Segmentation fault when doing apt-get util-linux

  - by Adam

  I've found that a lot of upgrade commands and Apache on my system are failing with Segmentation faults. I don't know if this is the main one, but a lot of packages depend on util-linux: root@myUbuntuHardyHeronServer:~# apt-get install util-linux Reading package lists... Done Building dependency tree Reading state information... Done The following packages will be upgraded: util-linux 1 upgraded, 0 newly installed, 0 to remove and 72 not upgraded. 20 not fully installed or removed. Need to get 0B/441kB of archives. After this operation, 0B of additional disk space will be used. (Reading database ... 20547 files and directories currently installed.) Preparing to replace util-linux 2.13.1-5ubuntu2 (using .../util-linux_2.13.1-5ub untu3.1_i386.deb) ... Unpacking replacement util-linux ... Segmentation fault dpkg: warning - old post-removal script returned error exit status 139 dpkg - trying script from the new package instead ... Segmentation fault dpkg: error processing /var/cache/apt/archives/util-linux_2.13.1-5ubuntu3.1_i386 .deb (--unpack): subprocess new post-removal script returned error exit status 139 Segmentation fault dpkg: error while cleaning up: subprocess post-removal script returned error exit status 139 Errors were encountered while processing: /var/cache/apt/archives/util-linux_2.13.1-5ubuntu3.1_i386.deb E: Sub-process /usr/bin/dpkg returned an error code (1)

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• Apache2 Segmentation fault with wsgi_module

  - by a coder

  Apache 2.2.3 is running as an existing web server under RHEL 5. Attempting to set up Trac using wsgi_module. RHEL 5 ships with python 2.4, so in order to use the current version of Trac (1.0) I needed to install it with easy_install-2.6. Trac works with the default mod_python, however users strongly encourage not using this module as it is officially dead. Using RHEL's package manager, I downloaded/installed python26-mod_wsgi.so. I backed up the httpd.conf, then made the following additions: LoadModule wsgi_module modules/python26-mod_wsgi.so #...# WSGIScriptAlias /trac /www/virtualhosts/trac/deploy/cgi-bin/trac.wsgi <Directory /www/virtualhosts/trac/deploy/cgi-bin> WSGIApplicationGroup %{GLOBAL} Order deny,allow Allow from all </Directory> Next I moved trac.conf to trac.conf.bak (contains mod_python calls). I tested the configuration using: apachectl configtest Syntax is OK. So I reloaded the server config using: service httpd reload At this time, all virtualhosted sites stopped responding. I restored my backup copy of httpd.conf, reloaded the server config, and the virtualhosted sites are being served again. A quick look at the httpd error_log shows: [Mon Oct 08 10:20:04 2012] [info] mod_wsgi (pid=28282): Initializing Python. [Mon Oct 08 10:20:04 2012] [info] mod_wsgi (pid=28280): Attach interpreter ''. [Mon Oct 08 10:20:04 2012] [debug] proxy_util.c(1817): proxy: grabbed scoreboard slot 0 in child 28283 for worker proxy:reverse [Mon Oct 08 10:20:04 2012] [debug] proxy_util.c(1836): proxy: worker proxy:reverse already initialized [Mon Oct 08 10:20:04 2012] [debug] proxy_util.c(1930): proxy: initialized single connection worker 0 in child 28283 for (*) [Mon Oct 08 10:20:04 2012] [info] mod_wsgi (pid=28283): Initializing Python. [Mon Oct 08 10:20:04 2012] [notice] child pid 28249 exit signal Segmentation fault (11) [Mon Oct 08 10:20:04 2012] [notice] child pid 28250 exit signal Segmentation fault (11) [Mon Oct 08 10:20:04 2012] [notice] child pid 28251 exit signal Segmentation fault (11) There are many similar lines, this is just a snip of the log file. Suggestions on what could be going on to cause the Segmentation faults?

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• Pre-startup segmentation fault with ptrace

  - by sfink

  I have somehow managed to mangle my computer so that any time I attempt to use something that uses ptrace to trace another process (eg strace, gdb), I get an immediate segmentation fault. For example: # strace /bin/true execve("/bin/true", ["/bin/true"], [/* 27 vars */]) = 0 --- SIGSEGV (Segmentation fault) @ 0 (0) --- +++ killed by SIGSEGV +++ or with gdb: # gdb /bin/true GNU gdb Fedora (6.8-27.el5) Copyright (C) 2008 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-redhat-linux-gnu"... (no debugging symbols found) (gdb) run Starting program: /bin/true Program terminated with signal SIGSEGV, Segmentation fault. The program no longer exists. You can't do that without a process to debug. rpm -V comes up clean on strace, gdb, and glibc. I do not have any LD_* variables set, and PATH has nothing special in it.

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• Tracking down the cause of a web service fault running in IIS

  - by BG100

  I have built a web service in Visual Studio 2008, and deployed it on IIS 7 running on Windows Server 2008 R2. It has been extensively tested, handles all errors gracefully and logs any uncaught errors to a file using log4net. The system normally runs perfectly, but occasionally (2 or 3 times a day) a fault occurs and screws up the application which needs an iisreset to get it working again. When the fault occurs I get some random errors that are caught by my catch-all error log, such as: Value cannot be null. Could not convert from type 'System.Boolean' to type 'System.DateTime'. Sequence contains no elements These errors are raised on every request until I manually do an iisreset, but there is no sight of them when the system is running normally. The web service is a stateless request-response application. Nothing is stored in the session. It could be load related, but I doubt it as there are only around 30 or 40 requests per minute. This is proving very tricky to track down. I can't work out what is putting IIS into this bad state, and why it needs an iisreset to get it working again. Nothing is reported in the event log. Can anyone suggest how to enable more extensive logging that might catch this fault? Also, does anyone know what might be causing the problem?

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• Why does accessing a member of a malloced array of structs seg fault?

  - by WSkinner

  I am working through Learn C The Hard Way and am stumped on something. I've written a simplified version of the problem I am running into to make it easier to get down to it. Here is the code: #include <stdlib.h> #define GROUP_SIZE 10 #define DATA_SIZE 64 struct Dummy { char *name; }; struct Group { struct Dummy **dummies; }; int main() { struct Group *group1 = malloc(sizeof(struct Group)); group1->dummies = malloc(sizeof(struct Dummy) * GROUP_SIZE); struct Dummy *dummy1 = group1->dummies[3]; // Why does this seg fault? dummy1->name = (char *) malloc(DATA_SIZE); return 0; } when I try to set the name pointer on one of my dummies I get a seg fault. Using valgrind it tells me this is uninitialized space. Why is this?

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• Linux / apache web-server segmentation fault warnings

  - by jeroen

  Lately I have been receiving a lot of segmentation fault warnings on my web-server. The warnings look like: [notice] child pid xxxx exit signal Segmentation fault (11) I have consulted with the server provider (it is a dedicated redhat enterprise server) and they could not find anything. What I have done so far: Since the error I have already tried the following: I have added more ram I have turned off / turned on several php modules (they sent me to a web-page someone had the same problem, caused by an excessive amount of php modules) At the moments the warnings occur, there seems to be plenty of free ram left and the number of processes is very low (the number of httpd processes is about a quarter of the maximum allowed). What can be causing these errors? Edit: current versions apache: 2.0.52 php: 5.2.8 RHEL 4 Edit 2: Although I asked this a long time ago, I never was able to solve it until I upgraded to php 5.3.

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• Line-length-tolerant XML diff

  - by Jon Skeet

  I've looked at the answers to this question, and unfortunately none of them has helped me so far. Not to beat about the bush, the second edition of C# in Depth is now in copy edit. I want to be able to see what the copy editor's done really easily, so I can reject or accept his changes. We're using a modified form of docbook, but I'm happy enough looking at the raw XML source. All fine so far - except that when the copy editor makes a change, that can change the line wrapping. So something that used to read: <para>Foo bar baz second line</para> now reads <para>Foo bar grontle baz second line</para> Now the real change here is the insertion of "grontle". I don't care that "baz" has moved from the first line to the second line... but all the diff tools I've seen do. I realise that one option would be to reformat the whole document (or possibly just whole paragraphs) into single lines... but that's then really hard to read, because diff tools don't wrap when they're displaying. I'm sure I can manage with the tools I've got, but if anyone knows of anything better, I'd be really glad to hear about it. I suspect my publishers would too :) (I've included the Windows tag here because I'd really need it to be available on Windows. I'd like to hear about any non-Windows software too, but only in case I could help to build it on Windows :)

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• ITIL Incident Classification - Fault vs SR vs Technical Incident

  - by ExceptionLimeCat

  I am new to ITIL and Incident classifcations and I am trying learn more about them and understand how they could integrate in our organization. I have found it difficult to find a clear definition of Fault vs. Service Request vs. Technical incidents. I am basing my definitions on this article: http://www.itsmsolutions.com/newsletters/DITYvol6iss27.htm As I understand it: Service Request - Service provided by IT as part of regular administration of a system. Fault - An unexpected error in a system. Technical Incident - An interruption or potential interruption in IT service due to an expected incident caused by some IT policy.

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• What is the best plan to handle server fault for google app engine [closed]

  - by lucemia

  I used google-appengine without preparing much backup plans before, but it looks like not a good idea anymore.... Since google app engine is quite hard to find a backup replacement, I plan to just add a "server error" page which will show while server fault. Currently I am thinking to: Use the cdn cloudfare in front of google app engine. It will also handle the NAME server for me. Prepare some static version of webpages (such as "Oops! the server fault") in another hosting platform While google app engine failed, I will switch the destination from google app engine to the static page by change the CNAME records on cloudfare. Is there any other recommand way to solve this situation?

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• seg fault at the end of program after executing everything?

  - by Fantastic Fourier

  Hello all, I wrote a quick program which executes every statement before giving a seg fault error. struct foo { int cat; int * dog; }; void bar (void * arg) { printf("o hello bar\n"); struct foo * food = (struct foo *) arg; printf("cat meows %i\n", food->cat); printf("dog barks %i\n", *(food->dog)); } void main() { int cat = 4; int * dog; dog = &cat; printf("cat meows %i\n", cat); printf("dog barks %i\n", *dog); struct foo * food; food->cat = cat; food->dog = dog; printf("cat meows %i\n", food->cat); printf("dog barks %i\n", *(food->dog)); printf("time for foo!\n"); bar(food); printf("begone!\n"); cat = 5; printf("cat meows %i\n", cat); printf("dog barks %i\n", *dog); // return 0; } which gives a result of cat meows 4 dog barks 4 cat meows 4 dog barks 4 time for foo! o hello bar cat meows 4 dog barks 4 begone! cat meows 5 dog barks 5 Segmentation fault (core dumped) I'm not really sure why it seg faults at the end? Any comments/insights are deeply appreciated.

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• Segmentation fault while switching QCompleter for QLineEdit [on hold]

  - by san

  I have a QLineEdit that uses autocompletion one which on focusIn event in which it shows paths from XML List(here I have used hardcoded list) but if user doesn't find the path from that list popped by QCompleter than I want user to be able to browse to path typing '/' in QLineEdit , I am not able to select the paths say /Users etc and on trying to type Segmentation fault occurs. from PyQt4.Qt import Qt, QObject,QLineEdit from PyQt4.QtCore import pyqtSlot,SIGNAL,SLOT from PyQt4 import QtGui, QtCore import sys class DirLineEdit(QLineEdit, QtCore.QObject): """docstring for DirLineEdit""" def __init__(self): super(DirLineEdit, self).__init__() self.defaultList = ['~/Development/python/searchMethod', '~/Development/Nuke_python', '~/Development/python/openexr', '~/Development/python/cpp2python'] self.textChanged.connect(self.__dirCompleter) def focusInEvent(self, event): if len(self.text()) == 0: self._pathsList() QtGui.QLineEdit.focusInEvent(self, event) self.completer().complete() def __dirCompleter(self): if len(self.text()) == 0: model = MyListModel(self.defaultList, self) completer = QtGui.QCompleter(model, self) completer.setModel(model) else: dirModel = QtGui.QFileSystemModel() dirModel.setRootPath(QtCore.QDir.currentPath()) dirModel.setFilter(QtCore.QDir.AllDirs | QtCore.QDir.NoDotAndDotDot | QtCore.QDir.Files) dirModel.setNameFilterDisables(0) completer = QtGui.QCompleter(dirModel, self) completer.setCaseSensitivity(QtCore.Qt.CaseInsensitive) completer.setModel(dirModel) self.setCompleter(completer) def _pathsList(self): completerList = QtCore.QStringList() for i in self.defaultList: completerList.append(QtCore.QString(i)) lineEditCompleter = QtGui.QCompleter(completerList) lineEditCompleter.setCompletionMode(QtGui.QCompleter.UnfilteredPopupCompletion) self.setCompleter(lineEditCompleter) class MyListModel(QtCore.QAbstractListModel): def __init__(self, datain, parent=None, *args): """ datain: a list where each item is a row """ QtCore.QAbstractTableModel.__init__(self, parent, *args) self.listdata = datain def rowCount(self, parent=QtCore.QModelIndex()): return len(self.listdata) def data(self, index, role): if index.isValid() and role == QtCore.Qt.DisplayRole: return QtCore.QVariant(self.listdata[index.row()]) else: return QtCore.QVariant() app = QtGui.QApplication(sys.argv) smObj = DirLineEdit() smObj.show() app.exec_() Please help fix this or suggest better way of implementation?

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• Fourth texture = segmentation fault

  - by Robin92

  I keep on getting segmentation fault each time I load fourth texture - what type of texture, I mean filename, does not matter. I checked value of GL_TEXTURES_STACK_SIZE which turned out to be 10 so quite more than 4, isn't it? Here're code fragments: funciton to load texture from png static GLuint gl_loadTexture(const char filename[]) { static int iTexNum = 1; GLuint texture = 0; img_s *img = NULL; img = img_loadPNG(filename); if (img) { glGenTextures(iTexNum++, &texture); glBindTexture(GL_TEXTURE_2D, texture); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR); glTexImage2D(GL_TEXTURE_2D, 0, img->iGlFormat, img->uiWidth, img->uiHeight, 0, img->iGlFormat, GL_UNSIGNED_BYTE, img->p_ubaData); img_free(img); //it may cause errors on windows } else printf("Error: loading texture '%s' failed!\n", filename); return texture; } actual loading static GLuint textures[4]; static void gl_init() { (...) //setting up OpenGL /* loading textures */ textures[0] = gl_loadTexture("images/background.png"); textures[1] = gl_loadTexture("images/spaceship.png"); textures[2] = gl_loadTexture("images/asteroid.png"); textures[3] = gl_loadTexture("images/asteroid2.png"); //this is causing SegFault no matter which file I load! } Any ideas? Problem is present on both Linux and Windows.

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• Segmentation fault 11 in MacOS X- C++ [migrated]

  - by Marcos Cesar Vargas Magana

  all. I have a "segmentation fault 11" error when I run the following code. The code actually compiles but I get the error at run time. //** Terror.h ** #include <iostream> #include <string> #include <map> using std::map; using std::pair; using std::string; template<typename Tsize> class Terror { public: //Inserts a message in the map. static Tsize insertMessage(const string& message) { mErrorMessages.insert( pair<Tsize, string>(mErrorMessages.size()+1, message) ); return mErrorMessages.size(); } private: static map<Tsize, string> mErrorMessages; } template<typename Tsize> map<Tsize,string> Terror<Tsize>::mErrorMessages; //** error.h ** #include <iostream> #include "Terror.h" typedef unsigned short errorType; typedef Terror<errorType> error; errorType memoryAllocationError=error::insertMessage("ERROR: out of memory."); //** main.cpp ** #include <iostream> #include "error.h" using namespace std; int main() { try { throw error(memoryAllocationError); } catch(error& err) { } } I have kind of debugging the code and the error happens when the message is being inserted in the static map member. An observation is that if I put the line: errorType memoryAllocationError=error::insertMessage("ERROR: out of memory."); inside the "main()" function instead of at global scope, then everything works fine. But I would like to extend the error messages at global scope, not at local scope. The map is defined static so that all instances of "error" share the same error codes and messages. Do you know how can I get this or something similar. Thank you very much.

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• What is the difference between a segmentation fault and a stack overflow?

  - by AruniRC

  For example when we call say, a recursive function, the successive calls are stored in the stack. However, due to an error if it goes on infinitely the error is 'Segmentation fault' (as seen on GCC). Shouldn't it have been 'stack-overflow'? What then is the basic difference between the two? Btw, an explanation would be more helpful than wikipedia links (gone through that, but no answer to specific query).

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• Ruby 1.9.3 segmentation fault on rackspace

  - by user531065

  I'm having a similar problem as "ruby 1.9 segmentation fault on exit." I followed the solution and updated libselinux with yum and have the following version installed: Package libselinux-2.0.96-6.fc14.1.x86_64 already installed and latest version I am running a RackSpace machine, kernel version: 2.6.35.4-rscloud. My C backtrace is: -- C level backtrace information ------------------------------------------- /usr/local/rvm/rubies/ruby-1.9.3-p0/lib/libruby.so.1.9(+0x18910a) [0x7f3cdb6c010a] vm_dump.c:796 /usr/local/rvm/rubies/ruby-1.9.3-p0/lib/libruby.so.1.9(+0x5eb04) [0x7f3cdb595b04] error.c:258 /usr/local/rvm/rubies/ruby-1.9.3-p0/lib/libruby.so.1.9(rb_bug+0xb8) [0x7f3cdb5969d8] error.c:277 /usr/local/rvm/rubies/ruby-1.9.3-p0/lib/libruby.so.1.9(+0x119865) [0x7f3cdb650865] signal.c:609 /lib64/libpthread.so.0() [0x328540eeb0] /usr/local/rvm/rubies/ruby-1.9.3-p0/lib/libruby.so.1.9(+0x179272) [0x7f3cdb6b0272] ./include/ruby/ruby.h:1306 /usr/local/rvm/rubies/ruby-1.9.3-p0/lib/libruby.so.1.9(+0x17f31b) [0x7f3cdb6b631b] vm.c:1220 /usr/local/rvm/rubies/ruby-1.9.3-p0/lib/libruby.so.1.9(+0x1800d5) [0x7f3cdb6b70d5] vm.c:624 /usr/local/rvm/rubies/ruby-1.9.3-p0/lib/libruby.so.1.9(rb_yield+0x44) [0x7f3cdb6bb274] vm.c:654 /usr/local/rvm/rubies/ruby-1.9.3-p0/lib/libruby.so.1.9(+0xab821) [0x7f3cdb5e2821] numeric.c:3204 /usr/local/rvm/rubies/ruby-1.9.3-p0/lib/libruby.so.1.9(+0x183601) [0x7f3cdb6ba601] vm_insnhelper.c:404 /usr/local/rvm/rubies/ruby-1.9.3-p0/lib/libruby.so.1.9(+0x1792b4) [0x7f3cdb6b02b4] insns.def:1015 /usr/local/rvm/rubies/ruby-1.9.3-p0/lib/libruby.so.1.9(+0x17f31b) [0x7f3cdb6b631b] vm.c:1220 /usr/local/rvm/rubies/ruby-1.9.3-p0/lib/libruby.so.1.9(+0x1800d5) [0x7f3cdb6b70d5] vm.c:624 /usr/local/rvm/rubies/ruby-1.9.3-p0/lib/libruby.so.1.9(rb_yield+0x44) [0x7f3cdb6bb274] vm.c:654 /usr/local/rvm/rubies/ruby-1.9.3-p0/lib/libruby.so.1.9(rb_ary_each+0x54) [0x7f3cdb5622e4] array.c:1478 /usr/local/rvm/rubies/ruby-1.9.3-p0/lib/libruby.so.1.9(+0x183601) [0x7f3cdb6ba601] vm_insnhelper.c:404 /usr/local/rvm/rubies/ruby-1.9.3-p0/lib/libruby.so.1.9(+0x1792b4) [0x7f3cdb6b02b4] insns.def:1015 /usr/local/rvm/rubies/ruby-1.9.3-p0/lib/libruby.so.1.9(+0x17f31b) [0x7f3cdb6b631b] vm.c:1220 /usr/local/rvm/rubies/ruby-1.9.3-p0/lib/libruby.so.1.9(rb_iseq_eval+0x1f0) [0x7f3cdb6bbae0] vm.c:1447 /usr/local/rvm/rubies/ruby-1.9.3-p0/lib/libruby.so.1.9(+0x67bfd) [0x7f3cdb59ebfd] load.c:310 /usr/local/rvm/rubies/ruby-1.9.3-p0/lib/libruby.so.1.9(rb_require_safe+0x6ef) [0x7f3cdb5a02df] load.c:619 /usr/local/rvm/rubies/ruby-1.9.3-p0/lib/libruby.so.1.9(+0x183601) [0x7f3cdb6ba601] vm_insnhelper.c:404 /usr/local/rvm/rubies/ruby-1.9.3-p0/lib/libruby.so.1.9(+0x1792b4) [0x7f3cdb6b02b4] insns.def:1015 /usr/local/rvm/rubies/ruby-1.9.3-p0/lib/libruby.so.1.9(+0x17f31b) [0x7f3cdb6b631b] vm.c:1220 /usr/local/rvm/rubies/ruby-1.9.3-p0/lib/libruby.so.1.9(+0x1800d5) [0x7f3cdb6b70d5] vm.c:624 /usr/local/rvm/rubies/ruby-1.9.3-p0/lib/libruby.so.1.9(rb_yield+0x44) [0x7f3cdb6bb274] vm.c:654 /usr/local/rvm/rubies/ruby-1.9.3-p0/lib/libruby.so.1.9(rb_ary_each+0x54) [0x7f3cdb5622e4] array.c:1478 /usr/local/rvm/rubies/ruby-1.9.3-p0/lib/libruby.so.1.9(+0x183601) [0x7f3cdb6ba601] vm_insnhelper.c:404 /usr/local/rvm/rubies/ruby-1.9.3-p0/lib/libruby.so.1.9(+0x1792b4) [0x7f3cdb6b02b4] insns.def:1015 /usr/local/rvm/rubies/ruby-1.9.3-p0/lib/libruby.so.1.9(+0x17f31b) [0x7f3cdb6b631b] vm.c:1220 /usr/local/rvm/rubies/ruby-1.9.3-p0/lib/libruby.so.1.9(rb_iseq_eval_main+0xaf) [0x7f3cdb6bbbdf] vm.c:1461 /usr/local/rvm/rubies/ruby-1.9.3-p0/lib/libruby.so.1.9(+0x6471a) [0x7f3cdb59b71a] eval.c:204 /usr/local/rvm/rubies/ruby-1.9.3-p0/lib/libruby.so.1.9(ruby_exec_node+0x1d) [0x7f3cdb59c56d] eval.c:251 /usr/local/rvm/rubies/ruby-1.9.3-p0/lib/libruby.so.1.9(ruby_run_node+0x1e) [0x7f3cdb59e60e] eval.c:244 ruby() [0x4008eb] /lib64/libc.so.6(__libc_start_main+0xfd) [0x3284c1ee5d] ruby() [0x4007d9]

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• The Server Fault Wiki of recommended practices [migrated]

  - by Avery Payne

  So I've noticed that there are several recommendations on basic practices on Server Fault, but there doesn't seem to be a cohesive view as to how those recommendations would all fit together. So I thought I would lump these together as a kind of mental exercise to see what the "ServerFault Community IT Department" would look like if it were implemented. This would give a few things: it would make a reasonable wiki (in the true wiki spirit of many contributions), it would provide several links to well-vetted practices, and it would be kind of fun to see what the amalgamation would look like. And who knows, it may even point out some interesting issues between different forms of "best practices", although I would be stunned if there was a conflict hidden in there someplace... Add your favorites from Server Fault as answers, and I'll re-edit this section with the results. Here's a few catagories to collect different ideas together. Hardware Configuration(s) Server room configuration. Server room temperature Firmware Updates and Scheduling Storage Configuration(s) Selecting a NAS box Linux: Dealing with /tmp Linux: Install apps in /var or /opt? Network Configuration(s) checking DNS health and compliance Security Practice(s) Password (General) Best Practices Password sharing methods Windows Update Updating Windows Servers that are hosts for VMs Network Service(s) User Service(s) User Naming & Deletion Upgrade Process(es) Disaster Recovery Checking Backups Documenting an outage for a post-mortem review Last Edit: 2010-02-17

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