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• Mouse takes a while to start working after boot

  - by warkior

  I just recently installed Ubuntu 12.04 (64 bit) and a number of my USB devices have stopped working. At least, they don't work for the first 3-5 minutes. I have two mice (one wireless, one wired) and a camera, which seem to take Ubuntu 3-5 minutes to recognize after booting up. Eventually, they do start to work, but it takes ages! lsusb results: (when the mice are working...) $ lsusb Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 002: ID 046d:c512 Logitech, Inc. LX-700 Cordless Desktop Receiver Bus 003 Device 003: ID 03f0:3f11 Hewlett-Packard PSC-1315/PSC-1317 Bus 006 Device 002: ID 046d:c00c Logitech, Inc. Optical Wheel Mouse Bus 006 Device 003: ID 046d:c52b Logitech, Inc. Unifying Receiver syslog entries for what seems (to my very untrained eye) to be the problem: Oct 12 20:12:51 REMOVED-GA-MA785GM-US2H kernel: [ 17.420117] usb 2-3: device descriptor read/64, error -110 Oct 12 20:12:57 REMOVED-GA-MA785GM-US2H goa[1879]: goa-daemon version 3.4.0 starting [main.c:112, main()] Oct 12 20:13:06 REMOVED-GA-MA785GM-US2H kernel: [ 32.636107] usb 2-3: device descriptor read/64, error -110 Oct 12 20:13:06 REMOVED-GA-MA785GM-US2H kernel: [ 32.852122] usb 2-3: new high-speed USB device number 3 using ehci_hcd Oct 12 20:13:21 REMOVED-GA-MA785GM-US2H kernel: [ 47.964131] usb 2-3: device descriptor read/64, error -110 Oct 12 20:13:37 REMOVED-GA-MA785GM-US2H kernel: [ 63.180115] usb 2-3: device descriptor read/64, error -110 Oct 12 20:13:37 REMOVED-GA-MA785GM-US2H kernel: [ 63.396126] usb 2-3: new high-speed USB device number 4 using ehci_hcd Oct 12 20:13:47 REMOVED-GA-MA785GM-US2H kernel: [ 73.804158] usb 2-3: device not accepting address 4, error -110 Oct 12 20:13:47 REMOVED-GA-MA785GM-US2H kernel: [ 73.916190] usb 2-3: new high-speed USB device number 5 using ehci_hcd Oct 12 20:13:58 REMOVED-GA-MA785GM-US2H kernel: [ 84.324160] usb 2-3: device not accepting address 5, error -110 Oct 12 20:13:58 REMOVED-GA-MA785GM-US2H kernel: [ 84.324197] hub 2-0:1.0: unable to enumerate USB device on port 3 Oct 12 20:13:58 REMOVED-GA-MA785GM-US2H udev-configure-printer: failed to claim interface Oct 12 20:13:58 REMOVED-GA-MA785GM-US2H udev-configure-printer: Failed to get parent Oct 12 20:13:58 REMOVED-GA-MA785GM-US2H udev-configure-printer: device devpath is /devices/pci0000:00/0000:00:12.0/usb3/3-3 Oct 12 20:13:58 REMOVED-GA-MA785GM-US2H udev-configure-printer: MFG:hp MDL:psc 1310 series SERN:CN47CB60BJO2 serial:CN47CB60BJO2 Oct 12 20:13:58 REMOVED-GA-MA785GM-US2H kernel: [ 84.768132] usb 5-3: new full-speed USB device number 2 using ohci_hcd Oct 12 20:14:01 REMOVED-GA-MA785GM-US2H udev-configure-printer: no corresponding CUPS device found Oct 12 20:14:13 REMOVED-GA-MA785GM-US2H kernel: [ 99.904185] usb 5-3: device descriptor read/64, error -110 Oct 12 20:14:29 REMOVED-GA-MA785GM-US2H kernel: [ 115.144188] usb 5-3: device descriptor read/64, error -110 Oct 12 20:14:29 REMOVED-GA-MA785GM-US2H kernel: [ 115.384178] usb 5-3: new full-speed USB device number 3 using ohci_hcd Oct 12 20:14:44 REMOVED-GA-MA785GM-US2H kernel: [ 130.520196] usb 5-3: device descriptor read/64, error -110 Oct 12 20:14:59 REMOVED-GA-MA785GM-US2H kernel: [ 145.760179] usb 5-3: device descriptor read/64, error -110 Oct 12 20:14:59 REMOVED-GA-MA785GM-US2H kernel: [ 146.000173] usb 5-3: new full-speed USB device number 4 using ohci_hcd Oct 12 20:15:10 REMOVED-GA-MA785GM-US2H kernel: [ 156.408168] usb 5-3: device not accepting address 4, error -110 Oct 12 20:15:10 REMOVED-GA-MA785GM-US2H kernel: [ 156.544188] usb 5-3: new full-speed USB device number 5 using ohci_hcd Oct 12 20:15:20 REMOVED-GA-MA785GM-US2H kernel: [ 166.952181] usb 5-3: device not accepting address 5, error -110 Oct 12 20:15:20 REMOVED-GA-MA785GM-US2H kernel: [ 166.952215] hub 5-0:1.0: unable to enumerate USB device on port 3 Oct 12 20:15:21 REMOVED-GA-MA785GM-US2H kernel: [ 167.216164] usb 6-2: new low-speed USB device number 2 using ohci_hcd Oct 12 20:15:21 REMOVED-GA-MA785GM-US2H mtp-probe: checking bus 6, device 2: "/sys/devices/pci0000:00/0000:00:13.1/usb6/6-2" Oct 12 20:15:21 REMOVED-GA-MA785GM-US2H mtp-probe: bus: 6, device: 2 was not an MTP device Oct 12 20:15:21 REMOVED-GA-MA785GM-US2H kernel: [ 167.396138] input: Logitech USB Mouse as /devices/pci0000:00/0000:00:13.1/usb6/6-2/6-2:1.0/input/input16 Oct 12 20:15:21 REMOVED-GA-MA785GM-US2H kernel: [ 167.396442] generic-usb 0003:046D:C00C.0003: input,hidraw2: USB HID v1.10 Mouse [Logitech USB Mouse] on usb-0000:00:13.1-2/input0 Oct 12 20:15:21 REMOVED-GA-MA785GM-US2H kernel: [ 167.660187] usb 6-3: new full-speed USB device number 3 using ohci_hcd Oct 12 20:15:21 REMOVED-GA-MA785GM-US2H mtp-probe: checking bus 6, device 3: "/sys/devices/pci0000:00/0000:00:13.1/usb6/6-3" Oct 12 20:15:21 REMOVED-GA-MA785GM-US2H mtp-probe: bus: 6, device: 3 was not an MTP device Oct 12 20:15:21 REMOVED-GA-MA785GM-US2H kernel: [ 167.859045] logitech-djreceiver 0003:046D:C52B.0006: hiddev0,hidraw3: USB HID v1.11 Device [Logitech USB Receiver] on usb-0000:00:13.1-3/input2 Oct 12 20:15:21 REMOVED-GA-MA785GM-US2H kernel: [ 167.865086] input: Logitech Unifying Device. Wireless PID:400a as /devices/pci0000:00/0000:00:13.1/usb6/6-3/6-3:1.2/0003:046D:C52B.0006/input/input17 Oct 12 20:15:21 REMOVED-GA-MA785GM-US2H kernel: [ 167.865291] logitech-djdevice 0003:046D:C52B.0007: input,hidraw4: USB HID v1.11 Mouse [Logitech Unifying Device. Wireless PID:400a] on usb-0000:00:13.1-3:1 Oct 12 20:15:24 REMOVED-GA-MA785GM-US2H colord: io/hpmud/musb.c 139: unable get_string_descriptor -1: Operation not permitted Oct 12 20:15:24 REMOVED-GA-MA785GM-US2H colord: io/hpmud/musb.c 2040: invalid product id string ret=-1 Oct 12 20:15:24 REMOVED-GA-MA785GM-US2H colord: io/hpmud/musb.c 139: unable get_string_descriptor -1: Operation not permitted Oct 12 20:15:24 REMOVED-GA-MA785GM-US2H colord: io/hpmud/musb.c 2045: invalid serial id string ret=-1 Oct 12 20:15:24 REMOVED-GA-MA785GM-US2H colord: io/hpmud/musb.c 139: unable get_string_descriptor -1: Operation not permitted Oct 12 20:15:24 REMOVED-GA-MA785GM-US2H colord: io/hpmud/musb.c 2050: invalid manufacturer string ret=-1

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• Server hung with "blocked for more than 120 seconds", diskless

  - by alterpub

  I have server which hung every 2-5 days. dmesg show following situation: kernel: [490894.231753] INFO: task munin-html:10187 blocked for more than 120 seconds. kernel: [490894.231799] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kernel: [490894.231843] munin-html D 0000000000000000 0 10187 9796 0x00000000 kernel: [490894.231878] ffff88063174b968 0000000000000082 ffff88063174b8d8 0000000000015b80 kernel: [490894.231930] ffff88063174bfd8 0000000000015b80 ffff88063174bfd8 ffff88062fe644d0 kernel: [490894.231982] 0000000000015b80 0000000000015b80 ffff88063174bfd8 0000000000015b80 kernel: [490894.232033] Call Trace: kernel: [490894.232059] [<ffffffff8117fce0>] ? sync_buffer+0x0/0x50 kernel: [490894.232089] [<ffffffff815a1f13>] io_schedule+0x73/0xc0 kernel: [490894.232115] [<ffffffff8117fd25>] sync_buffer+0x45/0x50 kernel: [490894.232143] [<ffffffff815a258f>] __wait_on_bit+0x5f/0x90 kernel: [490894.232170] [<ffffffff8117fce0>] ? sync_buffer+0x0/0x50 kernel: [490894.232197] [<ffffffff815a2638>] out_of_line_wait_on_bit+0x78/0x90 kernel: [490894.232227] [<ffffffff81080250>] ? wake_bit_function+0x0/0x40 kernel: [490894.232255] [<ffffffff8117fcd6>] __wait_on_buffer+0x26/0x30 kernel: [490894.232288] [<ffffffffa00131be>] squashfs_read_data+0x1be/0x520 [squashfs] kernel: [490894.232320] [<ffffffff8114f0f1>] ? __mem_cgroup_try_charge+0x71/0x450 kernel: [490894.232350] [<ffffffffa0013963>] squashfs_cache_get+0x1c3/0x320 [squashfs] kernel: [490894.232381] [<ffffffffa00136eb>] ? squashfs_copy_data+0x10b/0x130 [squashfs] kernel: [490894.232426] [<ffffffff815a3dbe>] ? _raw_spin_lock+0xe/0x20 kernel: [490894.232454] [<ffffffffa0013b68>] ? squashfs_read_metadata+0x48/0xf0 [squashfs] kernel: [490894.232499] [<ffffffffa0013ae1>] squashfs_get_datablock+0x21/0x30 [squashfs] kernel: [490894.232544] [<ffffffffa0015026>] squashfs_readpage+0x436/0x4a0 [squashfs] kernel: [490894.232575] [<ffffffff8111a375>] ? __inc_zone_page_state+0x35/0x40 kernel: [490894.232606] [<ffffffff8110d072>] __do_page_cache_readahead+0x172/0x210 kernel: [490894.232636] [<ffffffff8110d131>] ra_submit+0x21/0x30 kernel: [490894.232662] [<ffffffff811045f3>] filemap_fault+0x3f3/0x450 kernel: [490894.232691] [<ffffffff812bd156>] ? prio_tree_insert+0x256/0x2b0 kernel: [490894.232726] [<ffffffffa009225d>] aufs_fault+0x11d/0x170 [aufs] kernel: [490894.232755] [<ffffffff8111f6d4>] __do_fault+0x54/0x560 kernel: [490894.232782] [<ffffffff81122f39>] handle_mm_fault+0x1b9/0x440 kernel: [490894.232811] [<ffffffff811286f5>] ? do_mmap_pgoff+0x335/0x380 kernel: [490894.232840] [<ffffffff815a7af5>] do_page_fault+0x125/0x350 kernel: [490894.232867] [<ffffffff815a4675>] page_fault+0x25/0x30 Os info cat /etc/issue.net Ubuntu 10.04.2 LTS uname -a Linux Shard1Host3 2.6.35-32-server #68~lucid1-Ubuntu SMP Wed Mar 28 18:33:00 UTC 2012 x86_64 GNU/Linux This system load via ltsp and hasn't harddrives also it has a lot of memory 24Gb. free -m total used free shared buffers cached Mem: 24152 17090 7061 0 50 494 -/+ buffers/cache: 16545 7607 Swap: 0 0 0 I put vmstat info here but I think it won't give results after reboot vmstat 1 30 procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 0 0 0 7231156 52196 506400 0 0 0 0 172 143 7 0 92 0 1 0 0 7231024 52196 506400 0 0 0 0 7859 16233 5 0 94 0 0 0 0 7231024 52196 506400 0 0 0 0 7870 16446 2 0 98 0 0 0 0 7230900 52196 506400 0 0 0 0 7308 15661 5 0 95 0 0 0 0 7231100 52196 506400 0 0 0 0 7960 16543 6 0 94 0 0 0 0 7231100 52196 506400 0 0 0 0 7542 16047 5 1 94 0 3 0 0 7231100 52196 506400 0 0 0 0 7709 16621 3 0 96 0 0 0 0 7231220 52196 506400 0 0 0 0 7857 16552 4 0 96 0 0 0 0 7231220 52196 506400 0 0 0 0 7192 15491 6 0 94 0 0 0 0 7231220 52196 506400 0 0 0 0 7423 15792 5 1 94 0 1 0 0 7231260 52196 506404 0 0 0 0 7686 16296 2 0 98 0 0 0 0 7231260 52196 506404 0 0 0 0 6976 15183 5 0 95 0 0 0 0 7231260 52196 506404 0 0 0 0 7303 15600 4 0 95 0 0 0 0 7231320 52196 506404 0 0 0 0 7967 16241 1 0 98 0 0 0 0 7231444 52196 506404 0 0 0 0 6948 15113 6 0 94 0 0 0 0 7231444 52196 506404 0 0 0 0 7931 16181 6 0 94 0 1 0 0 7231516 52196 506404 0 0 0 0 7715 15829 6 0 94 0 0 0 0 7231516 52196 506404 0 0 0 0 7771 16036 2 0 97 0 0 0 0 7231268 52196 506404 0 0 0 0 7782 16202 6 0 94 0 1 0 0 7231212 52196 506404 0 0 0 0 7457 15622 4 0 96 0 0 0 0 7231212 52196 506404 0 0 0 0 7573 16045 2 0 98 0 2 0 0 7231216 52196 506404 0 0 0 0 7689 16076 6 0 94 0 0 0 0 7231424 52196 506404 0 0 0 0 7429 15650 4 0 95 0 3 0 0 7231424 52196 506404 0 0 0 0 7534 16168 3 0 97 0 1 0 0 7230548 52196 506404 0 0 0 0 8559 15926 7 1 92 0 0 0 0 7230672 52196 506404 0 0 0 0 7720 15905 2 0 98 0 0 0 0 7230548 52196 506404 0 0 0 0 7677 16313 5 0 95 0 1 0 0 7230676 52196 506404 0 0 0 0 7209 15432 5 0 95 0 0 0 0 7230800 52196 506404 0 0 0 0 7522 15861 2 0 98 0 0 0 0 7230552 52196 506404 0 0 0 0 7760 16661 5 0 95 0 In the munin(monitoring system) graphs I see(before server hung): Disk(nbd0) IOs per device: read: 289m but avg by week 2.09m Disk(nbd0) throughput per device: read: 4.73k but avg by week 108.76 Disk(nbd0) utilization per device: 100% but avg by week 1.2% Eth0 traffic was low: in/out only 2Mbps Number of threads increased to 566 usually 392 Fork rate 1.08 but usually 2.82 VMStat(processes state) Increased to 17.77(from 0 as far as I could see in the graph) CPU usage iowait 880.46% when usually 6.67% It'll be great if somebody help me to understand what's up.

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• What are the first operations that the Linux Kernel executes on boot?

  - by The Rook

  After the boot loader hands execution over to the kernel, what happens? I know assembler, so what are the first few executions that a kernel must make or is there a C function that does this? What is the startup sequence before the kernel can execute an arbitrary binary?

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• Windows XP: Have my program run in kernel mode?

  - by Kalamari

  I'm currently learning about the different modes the Windows operating system runs in (kernel mode vs. user mode), device drivers, their respective advantages and disadvantages and computer security in general. I would like to create a practical example of what a faulty device driver that runs in kernel mode can do to the system, by for example corrupting memory used for critical OS-processes. How can I execute my code in kernel mode instead of user mode, directly? Do I have to write a dummy device driver and install it to do this? Where can I read more about kernel and user mode in Windows? I know the dangers of this and will do all of the experiments on a virtual machine running Windows XP only

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• Kernel panic error

  - by cioby23

  We have a dedicated server with software RAID1 and one of the disk failed recently. The disk was replaced but after rebuilding the array and rebooting the server freezes with a Kernel Panic message No filesystem could mount root, tried: reiserfs ext3 ext2 cramfs msdos vfat iso9660 romfs fuseblk xfs Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(9,1) The filesystem on both disks is ext4. It seems the kernel can't load ext4 support. Is there any way to add ext4 support or do I need to recompile a new kernel again ? Interesting point that before disk replacement all was fine. The kernel is a stock kernel bzImage-2.6.34.6-xxxx-grs-ipv6-64 from our provider OVH Kind regards,

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• Forensic Analysis of the OOM-Killer

  - by Oddthinking

  Ubuntu's Out-Of-Memory Killer wreaked havoc on my server, quietly assassinating my applications, sendmail, apache and others. I've managed to learn what the OOM Killer is, and about its "badness" rules. While my machine is small, my applications are even smaller, and typically only half of my physical memory is in use, let alone swap-space, so I was surprised. I am trying to work out the culprit, but I don't know how to read the OOM-Killer logs. Can anyone please point me to a tutorial on how to read the data in the logs (what are ve, free and gen?), or help me parse these logs? Apr 20 20:03:27 EL135 kernel: kill_signal(13516.0): selecting to kill, queued 0, seq 1, exc 2326 0 goal 2326 0... Apr 20 20:03:27 EL135 kernel: kill_signal(13516.0): task ebb0c6f0, thg d33a1b00, sig 1 Apr 20 20:03:27 EL135 kernel: kill_signal(13516.0): selected 1, signalled 1, queued 1, seq 1, exc 2326 0 red 61795 745 Apr 20 20:03:27 EL135 kernel: kill_signal(13516.0): selecting to kill, queued 0, seq 2, exc 122 0 goal 383 0... Apr 20 20:03:27 EL135 kernel: kill_signal(13516.0): task ebb0c6f0, thg d33a1b00, sig 1 Apr 20 20:03:27 EL135 kernel: kill_signal(13516.0): selected 1, signalled 1, queued 1, seq 2, exc 383 0 red 61795 745 Apr 20 20:03:27 EL135 kernel: kill_signal(13516.0): task ebb0c6f0, thg d33a1b00, sig 2 Apr 20 20:03:27 EL135 kernel: OOM killed process watchdog (pid=14490, ve=13516) exited, free=43104 gen=24501. Apr 20 20:03:27 EL135 kernel: OOM killed process tail (pid=4457, ve=13516) exited, free=43104 gen=24502. Apr 20 20:03:27 EL135 kernel: OOM killed process ntpd (pid=10816, ve=13516) exited, free=43104 gen=24503. Apr 20 20:03:27 EL135 kernel: OOM killed process tail (pid=27401, ve=13516) exited, free=43104 gen=24504. Apr 20 20:03:27 EL135 kernel: OOM killed process tail (pid=29009, ve=13516) exited, free=43104 gen=24505. Apr 20 20:03:27 EL135 kernel: OOM killed process apache2 (pid=10557, ve=13516) exited, free=49552 gen=24506. Apr 20 20:03:27 EL135 kernel: OOM killed process apache2 (pid=24983, ve=13516) exited, free=53117 gen=24507. Apr 20 20:03:27 EL135 kernel: OOM killed process apache2 (pid=29129, ve=13516) exited, free=68493 gen=24508. Apr 20 20:03:27 EL135 kernel: OOM killed process sendmail-mta (pid=941, ve=13516) exited, free=68803 gen=24509. Apr 20 20:03:27 EL135 kernel: OOM killed process tail (pid=12418, ve=13516) exited, free=69330 gen=24510. Apr 20 20:03:27 EL135 kernel: OOM killed process python (pid=22953, ve=13516) exited, free=72275 gen=24511. Apr 20 20:03:27 EL135 kernel: OOM killed process apache2 (pid=6624, ve=13516) exited, free=76398 gen=24512. Apr 20 20:03:27 EL135 kernel: OOM killed process python (pid=23317, ve=13516) exited, free=94285 gen=24513. Apr 20 20:03:27 EL135 kernel: OOM killed process tail (pid=29030, ve=13516) exited, free=95339 gen=24514. Apr 20 20:03:28 EL135 kernel: OOM killed process apache2 (pid=20583, ve=13516) exited, free=101663 gen=24515. Apr 20 20:03:28 EL135 kernel: OOM killed process logger (pid=12894, ve=13516) exited, free=101694 gen=24516. Apr 20 20:03:28 EL135 kernel: OOM killed process bash (pid=21119, ve=13516) exited, free=101849 gen=24517. Apr 20 20:03:28 EL135 kernel: OOM killed process atd (pid=991, ve=13516) exited, free=101880 gen=24518. Apr 20 20:03:28 EL135 kernel: OOM killed process apache2 (pid=14649, ve=13516) exited, free=102748 gen=24519. Apr 20 20:03:28 EL135 kernel: OOM killed process grep (pid=21375, ve=13516) exited, free=132167 gen=24520. Apr 20 20:03:57 EL135 kernel: kill_signal(13516.0): selecting to kill, queued 0, seq 4, exc 4215 0 goal 4826 0... Apr 20 20:03:57 EL135 kernel: kill_signal(13516.0): task ede29370, thg df98b880, sig 1 Apr 20 20:03:57 EL135 kernel: kill_signal(13516.0): selected 1, signalled 1, queued 1, seq 4, exc 4826 0 red 189481 331 Apr 20 20:03:57 EL135 kernel: kill_signal(13516.0): task ede29370, thg df98b880, sig 2 Apr 20 20:04:53 EL135 kernel: kill_signal(13516.0): selecting to kill, queued 0, seq 5, exc 3564 0 goal 3564 0... Apr 20 20:04:53 EL135 kernel: kill_signal(13516.0): task c6c90110, thg cdb1a100, sig 1 Apr 20 20:04:53 EL135 kernel: kill_signal(13516.0): selected 1, signalled 1, queued 1, seq 5, exc 3564 0 red 189481 331 Apr 20 20:04:53 EL135 kernel: kill_signal(13516.0): task c6c90110, thg cdb1a100, sig 2 Apr 20 20:07:14 EL135 kernel: kill_signal(13516.0): selecting to kill, queued 0, seq 6, exc 8071 0 goal 8071 0... Apr 20 20:07:14 EL135 kernel: kill_signal(13516.0): task d7294050, thg c03f42c0, sig 1 Apr 20 20:07:14 EL135 kernel: kill_signal(13516.0): selected 1, signalled 1, queued 1, seq 6, exc 8071 0 red 189481 331 Apr 20 20:07:14 EL135 kernel: kill_signal(13516.0): task d7294050, thg c03f42c0, sig 2 Watchdog is a watchdog task, that was idle; nothing in the logs to suggest it had done anything for days. Its job is to restart one of the applications if it dies, so a bit ironic that it is the first to get killed. Tail was monitoring a few logs files. Unlikely to be consuming memory madly. The apache web-server only serves pages to a little old lady who only uses it to get to church on Sundays a couple of developers who were in bed asleep, and hadn't visited a page on the site for a few weeks. The only traffic it might have had is from the port-scanners; all the content is password-protected and not linked from anywhere, so no spiders are interested. Python is running two separate custom applications. Nothing in the logs to suggest they weren't humming along as normal. One of them was a relatively recent implementation, which makes suspect #1. It doesn't have any data-structures of any significance, and normally uses only about 8% of the total physical RAW. It hasn't misbehaved since. The grep is suspect #2, and the one I want to be guilty, because it was a once-off command. The command (which piped the output of a grep -r to another grep) had been started at least 30 minutes earlier, and the fact it was still running is suspicious. However, I wouldn't have thought grep would ever use a significant amount of memory. It took a while for the OOM killer to get to it, which suggests it wasn't going mad, but the OOM killer stopped once it was killed, suggesting it may have been a memory-hog that finally satisfied the OOM killer's blood-lust.

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• When was the last time you had a BSOD or kernel panic?

  - by Bruce McLeod

  The last time I saw a BSOD (Blue screen of death) was when Windows 7 tried to sleep in Parallels 3 which hadn't implemented ACPI for windows 7. Apart from that I can't recall the last time I had a blue screen. Has driver signing finally stopped frequent kernel panics?

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• How do I (and do I even want to) delete outdated versions of the Linux kernel?

  - by NoCatharsis

  I notice that GRUB (or is it GRUB2?) asks which version of Linux I'd like to boot, and outdated versions of the kernel are listed. How do I remove these and their associated files to save disk space? Since I'm new to Linux, is there any reason why I shouldn't remove them?

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• Error with perl script using module Mail::Sendmail

  - by Octopus

  I am using below code to connect to SMTP server where authentication is required for connection. While executing script I am getting an error message saying "Error sending mail: Connection error from mail.utiba.com on port 465 ()". However the connection to the mail server is working fine, I can connect to the mail server using other mail clients. Please suggest what I am doing wrong here. Is there any sendmail settings required? #!/usr/bin/perl use strict; use warnings; use Mail::Sendmail; print "Testing Mail::Sendmail version $Mail::Sendmail::VERSION\n"; print "Default server: $Mail::Sendmail::mailcfg{smtp}->[0]\n"; print "Default sender: $Mail::Sendmail::mailcfg{from}\n"; my %mail = ( From=> 'username', Bcc => '[email protected]', Cc=> '[email protected]', Subject => 'Test message', 'X-Mailer' => "Mail::Sendmail version $Mail::Sendmail::VERSION", ); $mail{Smtp} = 'mail.server.com:port'; $mail{auth} = {user=>'username', password=>"password", required=>1 }; $mail{'X-custom'} = 'My custom additionnal header'; $mail{'mESSaGE : '} = "The message key looks terrible, but works."; $mail{Date} = Mail::Sendmail::time_to_date( time() - 86400 ); if (sendmail %mail) { print "Mail sent OK.\n" } else { print "Error sending mail: $Mail::Sendmail::error \n" } print "\n\$Mail::Sendmail::log says:\n", $Mail::Sendmail::log;

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• Class vs. Module in VB

  - by Arlen Beiler

  What advantage is there, if any, to using Modules rather than classes in VB? How do they differ, and what advantages/disadvantages are there in using modules? In VB or VB.NET, I use both.

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• Perl, module export symbol

  - by Mike

  I'm having trouble understanding how to export a package symbol to a namespace. I've followed the documentation almost identically, but it seems to not know about any of the exporting symbols. mod.pm #!/usr/bin/perl package mod; use strict; use warnings; require Exporter; @ISA = qw(Exporter); @EXPORT=qw($a); our $a=(1); 1; test.pl $ cat test.pl #!/usr/bin/perl use mod; print($a); This is the result of running it $ ./test.pl Global symbol "@ISA" requires explicit package name at mod.pm line 10. Global symbol "@EXPORT" requires explicit package name at mod.pm line 11. Compilation failed in require at ./test.pl line 3. BEGIN failed--compilation aborted at ./test.pl line 3. $ perl -version This is perl, v5.8.4 built for sun4-solaris-64int

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• IIS7 url rewrite module, rewrite problem - the page views increase more then once

  - by stacker

  This is my rewrite regex: ^([0-9]+)|/(.*)$ for rewrite 1234\article-name to article.aspx?id={R:1}. The problem is: if the url is 1234, the page views count is increased with 1. but if the url is: 1234/article-name the page views count increased in 6. Any idea what is the problem and how to fix it? maybe the problem is with the regex.

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• Create a new project type in netbeans module

  - by marcos

  Hi Let's say i need to develop a plugin for a given technology not suported by netbeans, how do i register a new project type for this technology? The user would want to create a new project using the project wizzard, i've maneged to create a project template, but this requires the template to be based on an existing project type.

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• IIS7 rewrite module, rewrite problem, the page views increase more then once

  - by stacker

  This is my rewrite regex: ^([0-9]+)|/(.*)$ for rewrite 1234\article-name to article.aspx?id={R:1}. The problem is: if the url is 1234, the page views count is increased with 1. but if the url is: 1234/article-name the page views count increased in 6. Any idea what is the problem and how to fix it? maybe the problem is with the regex.

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• Python-How to call up a function from another module?

  - by user2691540

  I am making a project where I need several modules which are imported into one main module to make a pizza ordering service. Upon finishing this (to a working standard) I decided to re-code it so that the whole order is completed with one tkinter window, now instead of using input(), I use tkinter.Entry() etc. etc. To do this I had to use functions for each step so it is broken up nicely, e.g. the code asks if the user wants pickup or delivery, the user clicks a button which sets some variables and one of the buttons is then configured to say "continue" and the command leads to the next step of the pizza ordering process e.g. getting the name. The problem I have is that when I get past the last function of the first module the configured button has a command to go to a function in the second module, but it says that the command is not defined??? I have tried my way around this but cannot import the configured button variable into the next module, and anything else I tried gave no result, it simply doesn't go to the next module after the first module is done. I have made the main tkinter window in the main module and have it that it will mainloop after importing the other modules so shouldn't the function I want to call upon be defined? How can I get from one function to the next if the latter is in a seperate module? Is this possible or do I have to rethink my approach and if so how? Ok then, have made some more code to show what my problem is, this isn't what I am actually using but it's a lot shorter and has the same issue: this is the main module: import tkinter mainwindow = tkinter.Tk() # here i set the window to a certain size etc. import mod1 import mod2 mainwindow.mainloop() this is mod1: import tkinter def button1(): label.destroy() button1.destroy() button2.config(text = "continue", command = func2) def button2(): label.destroy() button1.destroy() button2.config(text = "continue", command = func2) label = tkinter.Label(text = "example label") button1 = tkinter.Button(text = "button1", command = button1) button2 = tkinter.Button(text = "button2", command = button2) label.pack() button1.pack() button2.pack() this is mod2: def func2(): button2.destroy() print ("haha it works...") I still get the problem that func2 is not defined? Thanks in advance

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• URL rewrite module for IIS7

  - by Learner

  I am trying to test if the redirect that I wrote works or not. If I do IISReset the redirect does not work. But if I recycle the app then this works. Is this how it works? <rule name="RedirectToanothercity" patternSyntax="ECMAScript" stopProcessing="true"> <match url="^home/cities.aspx?$" /> <conditions> <add input="{QUERY_STRING}" pattern="city=jerseycity" /> </conditions> <action type="Redirect" url="jerseycity" appendQueryString="false" />

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• How do I unload (reload) a Python module?

  - by Mark Harrison

  I have a long-running python server and would like to be able to upgrade a service without restarting the server. What's the best way do do this? if foo.py has changed: unimport foo <-- how do I do this? import foo myfoo=foo.Foo()

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• How do you install a module in erlang?

  - by Ted Karmel

  I am new to Erlang and would like to to know how to install third party modules for use in my web application. Where do you place this files and what sort of commands do you execute?

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• perl, module variable

  - by Mike

  I don't really understand how scoping works in perl modules. This doesn't print anything. I would like it if running a.pl printed 1 b.pm $f=1; a.pl use b; print $f

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• USB drives not recognized all of a sudden (module usb_storage not loading)

  - by Siddharth

  I am very close to the solution, just need to know how to get usb-storage to load I have tried most of the advice on askubuntu and other sites, usb_storage enable to fdisk -l. But I am unable to find steps to get it working again. sudo lsusb results Bus.... skipped 4 lines Bus 004 Device 002: ID 413c:3012 Dell Computer Corp. Optical Wheel Mouse Bus 005 Device 002: ID 413c:2105 Dell Computer Corp. Model L100 Keyboard Bus 001 Device 005: ID 8564:1000 sudo dmseg | tail reports [ 69.567948] usb 1-4: USB disconnect, device number 4 [ 74.084041] usb 1-6: new high-speed USB device number 5 using ehci_hcd [ 74.240484] Initializing USB Mass Storage driver... [ 74.256033] scsi5 : usb-storage 1-6:1.0 [ 74.256145] usbcore: registered new interface driver usb-storage [ 74.256147] USB Mass Storage support registered. [ 74.257290] usbcore: deregistering interface driver usb-storage fdisk -l reports Device Boot Start End Blocks Id System /dev/sda1 * 2048 972656639 486327296 83 Linux /dev/sda2 972658686 976771071 2056193 5 Extended /dev/sda5 972658688 976771071 2056192 82 Linux swap / Solaris I think I need steps to install and get usb_storage module working. Edit : I tried sudo modprobe -v usb-storage reports sudo modprobe -v usb-storage insmod /lib/modules/3.2.0-48-generic-pae/kernel/drivers/usb/storage/usb-storage.ko Edit : jsiddharth@siddharth-desktop:~$ sudo udevadm monitor --udev monitor will print the received events for: UDEV - the event which udev sends out after rule processing UDEV [4757.144372] add /module/usb_storage (module) UDEV [4757.146558] remove /module/usb_storage (module) UDEV [4757.148707] add /devices/pci0000:00/0000:00:1d.7/usb1/1-6 (usb) UDEV [4757.149699] add /bus/usb/drivers/usb-storage (drivers) UDEV [4757.151214] remove /bus/usb/drivers/usb-storage (drivers) UDEV [4757.156873] add /devices/pci0000:00/0000:00:1d.7/usb1/1-6/1-6:1.0 (usb) UDEV [4757.160903] add /devices/pci0000:00/0000:00:1d.7/usb1/1-6/1-6:1.0/host9 (scsi) UDEV [4757.164672] add /devices/pci0000:00/0000:00:1d.7/usb1/1-6/1-6:1.0/host9/scsi_host/host9 (scsi_host) UDEV [4757.165163] remove /devices/pci0000:00/0000:00:1d.7/usb1/1-6/1-6:1.0/host9/scsi_host/host9 (scsi_host) UDEV [4757.165440] remove /devices/pci0000:00/0000:00:1d.7/usb1/1-6/1-6:1.0/host9 (scsi) Narrowing down more : Seems like I need usb_storage to load as a module jsiddharth@siddharth-desktop:~$ lsmod | grep usb usbserial 37201 0 usbhid 41937 0 hid 77428 1 usbhid Still no usb driver mounted. Nor does a device show up in /dev. Any step by step process to debug and fix this will be really helpful.

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• Is ServerManager module available on Windows 7?

  - by ruslan

  Is ServerManager module available on Windows 7 Ultimate ? I think (but I'm not sure because I never looked at output before) the PS script that I have worked before but after some problems with IIS7 installation it stopped working. Following script import-module servermanager fails with error Import-Module : The specified module 'servermanager' was not loaded because no valid module file was found in any module directory. At line:1 char:14 + import-module <<<< servermanager + CategoryInfo : ResourceUnavailable: (servermanager:String) [Import-Module], FileNotFoundException + FullyQualifiedErrorId : Modules_ModuleNotFound,Microsoft.PowerShell.Commands.ImportModuleCommand I found recommendation to run Dism.exe /Online /Enable-Feature /FeatureName:ServerManager-PSH-Cmdlets on my machine but it also fails with error Feature name ServerManager-PSH-Cmdlets is unknown.

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• Single python file distribution: module or package?

  - by DanielSank

  Suppose I have a useful python function or class (or whatever) called useful_thing which exists in a single file. There are essentialy two ways to organize the source tree. The first way uses a single module: - setup.py - README.rst - ...etc... - foo.py where useful_thing is defined in foo.py. The second strategy is to make a package: - setup.py - README.rst - ...etc... - foo |-module.py |-__init__.py where useful_thing is defined in module.py. In the package case __init__.py would look like this from foo.module import useful_thing so that in both cases you can do from foo import useful_thing. Question: Which way is preferred, and why? EDIT: Since user gnat says this question is poorly formed, I'll add that the official python packaging tutorial does not seem to comment on which of the methods described above is the preferred one. I am explicitly not giving my personal list of pros and cons because I'm interested in whether there is a community preferred method, not generating a discussion of pros/cons :)

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• Incorporating libs into module pattern

  - by webnesto

  I have recently started using require.js (along with Backbone.js, jQuery, and a handful of other JavaScript libs) and I love the module pattern (here's a nice synopsis if you're unfamiliar: http://www.adequatelygood.com/2010/3/JavaScript-Module-Pattern-In-Depth). Something I'm running up against is best practices on incorporating libs that don't (out of the box) support the module pattern. For example, jQuery without modification is going to load into a global jQuery variable and that's that. Require.js recognizes this and provides an example project for download with a (slightly) modified version of jQuery to incorporate with a require.js project. This goes against everything I've ever learned about using external libs - never modify the source. I can list a ton of reasons. Regardless, this is not an approach I'm comfortable with. I have been using a mixed approach - wherein I build/load the "traditional" JS libraries in a "traditional" way (available in the global namespace) and then using the module pattern for all of my application code. This seems okay to me, but it bugs me because one of the real beauties of the module pattern (no globals) is getting perverted. Anyone else got a better solution to this problem?

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• 'module' object has no attribute 'element_make_factory'

  - by Ronan Dejhero

  i have this code : import pygst import st, pygtk player_name = gst.element_make_factory("playbin", "Multimedia Player") player_name.set_property("uri", "../media/alert.mp3") player_name.set_state(gst.PLAYING) it keeps throwing me the following error : player_name = gst.element_make_factory("playbin", "Multimedia Player") AttributeError: 'module' object has no attribute 'element_make_factory' nay way to solve this and why is this happening ? if i print gst i get the following : <module 'gst' from '/usr/lib/python2.7/dist-packages/gst-0.10/gst/__init__.pyc'> so it is a module !

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• The DotNetNuke Gallery Module - 7 Video Tutorials

  In this video tutorial we cover the Installation of the DotNetNuke Core Gallery Module and show you how to configure it correctly.We walk you through how to use all of the features in the Gallery module including creating albums, uploading files, bulk uploads, the slideshow, media files, watermarks, templates, and more.The videos contain:Video 1 - Introduction to the DNNGallery Module, Installation and Basic ConfigurationVideo 2 -How to Upload Images and Configure Their SettingsVideo 3 -Creating Gallery Albums and Bulk UploadingVideo 4 - How to Add Files and Albums Using FTP, Adding Music and Changing Permissible Upload TypesVideo 5 - How to Add Video Files, How to Rate Files,Gallery Look and FeelVideo 6 - Changing Feature Settings,Adding Watermarks, Gallery Security RolesVideo 7 - Working withPrivate Galleries and Security Roles, Gallery MaintenanceTotal Time Length: 57minsThe DotNetNuke Gallery Module - 7 Video Tutorials Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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