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  • Linux Kernel crash mutex_lock_slowpath "blocked for more than 120 seconds". What to do?

    - by Roddick
    I have out-of-the box Debian Lenny with non-custom kernel 2.6.26-2-amd64. Brand new server that is used to 5% of it's potential, CPU and Disk-wise. Meaning it probably not crashing because of overload. every few days it freezes with hundreds of these messages in console log: : [284847.828428] INFO: task apache2:12473 blocked for more than 120 seconds. : [284847.868468] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. : [284847.912759] apache2 D ffff8101bc6b7ab0 0 12473 14358 : [284847.912763] ffff810160d5bc50 0000000000000082 ffff8101c0002e40 0000000000000000 : [284847.912766] ffff8101a7c42950 ffff810327d92810 ffff8101a7c42bd8 0000000400000044 : [284847.912770] ffff8101c0002e40 00000000000612d0 0000000000000000 00000040000612d0 : [284847.912773] Call Trace: : [284847.912786] [<ffffffff80429b0d>] __mutex_lock_slowpath+0x64/0x9b : [284847.912790] [<ffffffff80429972>] mutex_lock+0xa/0xb : [284847.912794] [<ffffffff802a20b9>] do_lookup+0x82/0x1c1 : [284847.912800] [<ffffffff802a4271>] __link_path_walk+0x87a/0xd19 : [284847.912805] [<ffffffff80295844>] kmem_getpages+0x96/0x15f : [284847.912808] [<ffffffff80295fb7>] ____cache_alloc_node+0x6d/0x106 : [284847.912814] [<ffffffff802a4756>] path_walk+0x46/0x8b : [284847.912819] [<ffffffff802a4a82>] do_path_lookup+0x158/0x1cf : [284847.912822] [<ffffffff802a3879>] getname+0x140/0x1a7 : [284847.912827] [<ffffffff802a53f1>] __user_walk_fd+0x37/0x4c : [284847.912831] [<ffffffff8029e381>] vfs_lstat_fd+0x18/0x47 : [284847.912840] [<ffffffff8029e3c9>] sys_newlstat+0x19/0x31 : [284847.912848] [<ffffffff8020beda>] system_call_after_swapgs+0x8a/0x8f Almost all traces has __mutex_lock_slowpath as top-level. Only some has different trace: : [284847.737386] INFO: task apache2:12472 blocked for more than 120 seconds. : [284847.777551] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. : [284847.824881] apache2 D ffff8101bc6b7ab0 0 12472 14358 : [284847.824886] ffff8101b9cc1c50 0000000000000086 ffffffffa0131e0a 0000000000000002 : [284847.824889] ffff8102e7454300 ffff810324c6cad0 ffff8102e7454588 0000000000000000 : [284847.824893] 0000000000000001 0000000000000296 0000000000000003 ffff8101b9cc1c58 : [284847.824896] Call Trace: : [284847.828403] [<ffffffffa0131e0a>] :ext3:__ext3_journal_dirty_metadata+0x1e/0x46 : [284847.828412] [<ffffffff80429b0d>] __mutex_lock_slowpath+0x64/0x9b : [284847.828418] [<ffffffff80429972>] mutex_lock+0xa/0xb : [284847.828421] [<ffffffff802a20b9>] do_lookup+0x82/0x1c1 : [284847.828427] [<ffffffff802a4271>] __link_path_walk+0x87a/0xd19 : [284847.828428] [<ffffffff80271296>] find_lock_page+0x1f/0x8a : [284847.828428] [<ffffffff80273182>] filemap_fault+0x1c2/0x33c : [284847.828428] [<ffffffff802a4756>] path_walk+0x46/0x8b : [284847.828428] [<ffffffff802a4a82>] do_path_lookup+0x158/0x1cf : [284847.828428] [<ffffffff802a3879>] getname+0x140/0x1a7 : [284847.828428] [<ffffffff802a53f1>] __user_walk_fd+0x37/0x4c : [284847.828428] [<ffffffff8029e381>] vfs_lstat_fd+0x18/0x47 : [284847.828428] [<ffffffff8029e3c9>] sys_newlstat+0x19/0x31 : [284847.828428] [<ffffffff8020beda>] system_call_after_swapgs+0x8a/0x8f kernel: [1912668.466347] INFO: task apache2:17984 blocked for more than 120 seconds. [1912668.507035] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. : [1912668.555165] apache2 D ffff8101c5637ba0 0 17984 17282 : [1912668.596752] ffff810166a7dd30 0000000000000086 0000000000000000 ffff810166a7dcd8 : [1912668.643341] ffff8101c563c880 ffff81024505f000 0000000000000002 ffff810166a7dd68 : [1912668.699566] 0000000000000086 00000000000cb1a0 0000000000000000 ffff81017f344d60 : [1912668.744773] Call Trace: : [1912668.761754] [<ffffffff8022a3ed>] pick_next_task_fair+0x6e/0x7a : [1912668.829311] [<ffffffff802be0e2>] bio_alloc_bioset+0x89/0xd9 : [1912668.861930] [<ffffffff8024ac3a>] getnstimeofday+0x39/0x98 : [1912668.897005] [<ffffffff802710f6>] sync_page+0x0/0x41 : [1912668.927868] [<ffffffff80429487>] io_schedule+0x5c/0x9e : [1912668.960286] [<ffffffff80271132>] sync_page+0x3c/0x41 : [1912668.991756] [<ffffffff804295fa>] __wait_on_bit_lock+0x36/0x66 : [1912669.031757] [<ffffffff802710e3>] __lock_page+0x5e/0x64 : [1912669.064191] [<ffffffff802461d3>] wake_bit_function+0x0/0x23 : [1912669.100100] [<ffffffff80281bc5>] handle_mm_fault+0x5e4/0x8de : [1912669.134531] [<ffffffff802461a5>] autoremove_wake_function+0x0/0x2e : [1912669.174623] [<ffffffff802aa108>] fcntl_setlk+0x1cf/0x291 : [1912669.210623] [<ffffffff802461a5>] autoremove_wake_function+0x0/0x2e : [1912669.246923] [<ffffffff802a677f>] sys_fcntl+0x280/0x2f7 After googling for "mutex_lock_slowpath" I can only find the Kernel mailing list discussions that this issue was introduced in some commit. Wthout reference to verison. Discussions as recent as Jan 25, 2011. The Kernel I am using is form Debian Lenny, year ago. What should I do? Is this bug even fixed in kernel? if it's such obvious bug why it happens so rarely? Should I download latest kernel from kernel.org and upgrade? Should I use Debian backports to install new "Approved" kernel? Am I missing something? What to do?

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  • Need complete picture of virtual adress space

    - by claws
    Hello, This image gives a good picture about Virtual Adress space. But it only says half of the story. It only gives complete picture of User Adress space ie.. lower 50% (or 75% in some cases). What about the rest 50% (or 25%) which is occupied by the kernel. I know kernel also has so many different things like kernel modules , device drivers, core kernel itself. There must be some kind of layout right? What is its layout? If you say its Operating System dependent. I would say, there are two major operating systems Windows & Linux. Please give answer for any one these.

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  • task blocked for more than

    - by Manuel Sopena Ballesteros
    I have a webserver with the configuration below: VMWare ESXi environemt CPanel installed CentOS release 6.5 (Final) 4 CPUs 2G RAM 2x VM disks 100G each LVM system My issue is I am getting kernel panic quite frequently. These is a list of some processes blocked I could see from the console: mysqld queueprocd httpd suphp vmtoolsd loop0 auditd this is my sar logs Linux 2.6.32-431.3.1.el6.x86_64 (test01) 08/22/2014 _x86_64_ (4 CPU) 12:00:01 AM CPU %user %nice %system %iowait %steal %idle 12:10:01 AM all 26.86 0.01 0.98 0.57 0.00 71.57 12:20:01 AM all 1.78 0.02 1.03 0.08 0.00 97.09 12:30:01 AM all 26.34 0.02 0.85 0.05 0.00 72.74 12:40:01 AM all 27.12 0.01 1.11 1.22 0.00 70.54 12:50:01 AM all 1.59 0.02 0.94 0.13 0.00 97.32 01:00:01 AM all 26.10 0.01 0.77 0.04 0.00 73.07 01:10:01 AM all 27.51 0.01 1.16 0.14 0.00 71.18 01:20:01 AM all 1.80 0.07 1.06 0.08 0.00 96.99 01:30:01 AM all 26.19 0.01 0.78 0.05 0.00 72.96 01:40:01 AM all 26.62 0.02 0.87 0.05 0.00 72.45 01:50:02 AM all 1.35 0.01 0.87 0.02 0.00 97.75 02:00:01 AM all 26.11 0.02 0.69 0.02 0.00 73.17 02:10:01 AM all 26.73 0.02 0.89 0.14 0.00 72.21 02:20:01 AM all 1.45 0.01 0.92 0.04 0.00 97.58 02:30:01 AM all 26.59 0.01 1.06 0.03 0.00 72.31 02:40:01 AM all 26.27 0.01 0.72 0.05 0.00 72.95 02:50:01 AM all 0.86 0.01 0.50 0.09 0.00 98.53 03:00:01 AM all 25.61 0.02 0.39 0.03 0.00 73.96 03:10:01 AM all 26.30 0.08 0.66 0.14 0.00 72.82 03:20:01 AM all 0.81 0.01 0.51 0.04 0.00 98.63 03:30:02 AM all 26.15 0.02 0.53 0.07 0.00 73.24 03:40:01 AM all 26.06 0.01 0.47 0.04 0.00 73.42 03:50:01 AM all 0.96 0.02 0.51 0.03 0.00 98.48 Average: all 17.69 0.02 0.79 0.14 0.00 81.36 06:58:14 AM LINUX RESTART 07:00:01 AM CPU %user %nice %system %iowait %steal %idle 07:10:01 AM all 1.04 0.02 0.57 0.95 0.00 97.42 07:20:02 AM all 0.66 0.01 0.39 0.06 0.00 98.87 07:30:01 AM all 25.71 0.01 0.45 0.16 0.00 73.67 07:40:01 AM all 25.88 0.01 0.35 0.08 0.00 73.68 As you can see the server became unresponsive at 03.50 AM and I had to reset the VM at 06.58 AM to fix it. dmesg does not show any relevant information. I don't see any bottleneck in sar, any idea what can I check next? thank you very much

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  • Ubuntu hard disk problem

    - by Henadzy
    Hello! I have got the error with a hard disk on Ubuntu 9.10. It slows down my system, applications have not been responding for a long time. But when I mount and use filesystem which placed on this hard disk at other computer it works properly. disk: SAMSUNG HD161HJ (SATA) syslog: Apr 25 00:28:25 vare6gin kernel: [ 885.773839] ata3.00: exception Emask 0x1 SAct 0x1e SErr 0x0 action 0x6 frozen Apr 25 00:28:25 vare6gin kernel: [ 885.773845] ata3.00: Ata error. fis:0x21 Apr 25 00:28:25 vare6gin kernel: [ 885.773861] ata3.00: cmd 60/08:08:3f:00:ad/00:00:10:00:00/40 tag 1 ncq 4096 in Apr 25 00:28:25 vare6gin kernel: [ 885.773864] res 51/40:24:67:c8:91/40:00:05:00:00/40 Emask 0x9 (media error) Apr 25 00:28:25 vare6gin kernel: [ 885.773871] ata3.00: status: { DRDY ERR } Apr 25 00:28:25 vare6gin kernel: [ 885.773877] ata3.00: error: { UNC } Apr 25 00:28:25 vare6gin kernel: [ 885.773890] ata3.00: cmd 60/18:10:9f:6b:ed/00:00:0e:00:00/40 tag 2 ncq 12288 in Apr 25 00:28:25 vare6gin kernel: [ 885.773893] res 51/40:24:67:c8:91/40:00:05:00:00/40 Emask 0x9 (media error) Apr 25 00:28:25 vare6gin kernel: [ 885.773900] ata3.00: status: { DRDY ERR } Apr 25 00:28:25 vare6gin kernel: [ 885.773904] ata3.00: error: { UNC } Apr 25 00:28:25 vare6gin kernel: [ 885.773918] ata3.00: cmd 60/08:18:3f:5f:ed/00:00:0e:00:00/40 tag 3 ncq 4096 in Apr 25 00:28:25 vare6gin kernel: [ 885.773921] res 51/40:24:67:c8:91/40:00:05:00:00/40 Emask 0x9 (media error) Apr 25 00:28:25 vare6gin kernel: [ 885.773927] ata3.00: status: { DRDY ERR } Apr 25 00:28:25 vare6gin kernel: [ 885.773932] ata3.00: error: { UNC } Apr 25 00:28:25 vare6gin kernel: [ 885.773946] ata3.00: cmd 60/08:20:67:c8:91/00:00:05:00:00/40 tag 4 ncq 4096 in Apr 25 00:28:25 vare6gin kernel: [ 885.773948] res 51/40:24:67:c8:91/40:00:05:00:00/40 Emask 0x9 (media error) Apr 25 00:28:25 vare6gin kernel: [ 885.773955] ata3.00: status: { DRDY ERR } Apr 25 00:28:25 vare6gin kernel: [ 885.773960] ata3.00: error: { UNC } Apr 25 00:28:25 vare6gin kernel: [ 885.773970] ata3: hard resetting link Apr 25 00:28:25 vare6gin kernel: [ 885.773974] ata3: nv: skipping hardreset on occupied port Apr 25 00:28:25 vare6gin kernel: [ 886.240073] ata3: SATA link up 3.0 Gbps (SStatus 123 SControl 300) Apr 25 00:28:25 vare6gin kernel: [ 886.256277] ata3.00: configured for UDMA/133 Apr 25 00:28:25 vare6gin kernel: [ 886.256305] ata3: EH complete Apr 25 00:28:27 vare6gin kernel: [ 888.176088] ata3: EH in SWNCQ mode,QC:qc_active 0xF sactive 0xF Apr 25 00:28:27 vare6gin kernel: [ 888.176099] ata3: SWNCQ:qc_active 0xF defer_bits 0x0 last_issue_tag 0x3 Apr 25 00:28:27 vare6gin kernel: [ 888.176102] dhfis 0xF dmafis 0x1 sdbfis 0x0 Apr 25 00:28:27 vare6gin kernel: [ 888.176109] ata3: ATA_REG 0x51 ERR_REG 0x40 Apr 25 00:28:27 vare6gin kernel: [ 888.176113] ata3: tag : dhfis dmafis sdbfis sacitve Apr 25 00:28:27 vare6gin kernel: [ 888.176120] ata3: tag 0x0: 1 1 0 1 Apr 25 00:28:27 vare6gin kernel: [ 888.176126] ata3: tag 0x1: 1 0 0 1 Apr 25 00:28:27 vare6gin kernel: [ 888.176131] ata3: tag 0x2: 1 0 0 1 Apr 25 00:28:27 vare6gin kernel: [ 888.176136] ata3: tag 0x3: 1 0 0 1

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  • Ubuntu hard disk problem

    - by Henadzy
    Hello! I have got the error with a hard disk on Ubuntu 9.10. It slows down my system, applications have not been responding for a long time. But when I mount and use filesystem which placed on this hard disk at other computer it works properly. disk: SAMSUNG HD161HJ (SATA) syslog: Apr 25 00:28:25 vare6gin kernel: [ 885.773839] ata3.00: exception Emask 0x1 SAct 0x1e SErr 0x0 action 0x6 frozen Apr 25 00:28:25 vare6gin kernel: [ 885.773845] ata3.00: Ata error. fis:0x21 Apr 25 00:28:25 vare6gin kernel: [ 885.773861] ata3.00: cmd 60/08:08:3f:00:ad/00:00:10:00:00/40 tag 1 ncq 4096 in Apr 25 00:28:25 vare6gin kernel: [ 885.773864] res 51/40:24:67:c8:91/40:00:05:00:00/40 Emask 0x9 (media error) Apr 25 00:28:25 vare6gin kernel: [ 885.773871] ata3.00: status: { DRDY ERR } Apr 25 00:28:25 vare6gin kernel: [ 885.773877] ata3.00: error: { UNC } Apr 25 00:28:25 vare6gin kernel: [ 885.773890] ata3.00: cmd 60/18:10:9f:6b:ed/00:00:0e:00:00/40 tag 2 ncq 12288 in Apr 25 00:28:25 vare6gin kernel: [ 885.773893] res 51/40:24:67:c8:91/40:00:05:00:00/40 Emask 0x9 (media error) Apr 25 00:28:25 vare6gin kernel: [ 885.773900] ata3.00: status: { DRDY ERR } Apr 25 00:28:25 vare6gin kernel: [ 885.773904] ata3.00: error: { UNC } Apr 25 00:28:25 vare6gin kernel: [ 885.773918] ata3.00: cmd 60/08:18:3f:5f:ed/00:00:0e:00:00/40 tag 3 ncq 4096 in Apr 25 00:28:25 vare6gin kernel: [ 885.773921] res 51/40:24:67:c8:91/40:00:05:00:00/40 Emask 0x9 (media error) Apr 25 00:28:25 vare6gin kernel: [ 885.773927] ata3.00: status: { DRDY ERR } Apr 25 00:28:25 vare6gin kernel: [ 885.773932] ata3.00: error: { UNC } Apr 25 00:28:25 vare6gin kernel: [ 885.773946] ata3.00: cmd 60/08:20:67:c8:91/00:00:05:00:00/40 tag 4 ncq 4096 in Apr 25 00:28:25 vare6gin kernel: [ 885.773948] res 51/40:24:67:c8:91/40:00:05:00:00/40 Emask 0x9 (media error) Apr 25 00:28:25 vare6gin kernel: [ 885.773955] ata3.00: status: { DRDY ERR } Apr 25 00:28:25 vare6gin kernel: [ 885.773960] ata3.00: error: { UNC } Apr 25 00:28:25 vare6gin kernel: [ 885.773970] ata3: hard resetting link Apr 25 00:28:25 vare6gin kernel: [ 885.773974] ata3: nv: skipping hardreset on occupied port Apr 25 00:28:25 vare6gin kernel: [ 886.240073] ata3: SATA link up 3.0 Gbps (SStatus 123 SControl 300) Apr 25 00:28:25 vare6gin kernel: [ 886.256277] ata3.00: configured for UDMA/133 Apr 25 00:28:25 vare6gin kernel: [ 886.256305] ata3: EH complete Apr 25 00:28:27 vare6gin kernel: [ 888.176088] ata3: EH in SWNCQ mode,QC:qc_active 0xF sactive 0xF Apr 25 00:28:27 vare6gin kernel: [ 888.176099] ata3: SWNCQ:qc_active 0xF defer_bits 0x0 last_issue_tag 0x3 Apr 25 00:28:27 vare6gin kernel: [ 888.176102] dhfis 0xF dmafis 0x1 sdbfis 0x0 Apr 25 00:28:27 vare6gin kernel: [ 888.176109] ata3: ATA_REG 0x51 ERR_REG 0x40 Apr 25 00:28:27 vare6gin kernel: [ 888.176113] ata3: tag : dhfis dmafis sdbfis sacitve Apr 25 00:28:27 vare6gin kernel: [ 888.176120] ata3: tag 0x0: 1 1 0 1 Apr 25 00:28:27 vare6gin kernel: [ 888.176126] ata3: tag 0x1: 1 0 0 1 Apr 25 00:28:27 vare6gin kernel: [ 888.176131] ata3: tag 0x2: 1 0 0 1 Apr 25 00:28:27 vare6gin kernel: [ 888.176136] ata3: tag 0x3: 1 0 0 1

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  • barriers in SMP linux kernel

    - by osgx
    Hello Is there smth like pthread_barrier in SMP Linux kernel? When kernel works simultaneously on 2 and more CPUs with the same structure, the barrier (like pthread_barrier) can be useful. It will stop all CPUs entering to it until last CPU will run the barrier. From this moment all CPUs again works.

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  • where to start linux kernel programming?

    - by Adnan
    I have been programming in C for a couple of years in Linux. Now I want to work on linux kernel and contribute to kernel, if possible. I have been looking on the internet for the information about a starting point but I couldn't find one. So can any one please tell me where to begin?

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  • How can I solve the error while compiling the linux kernel 2.6.32.8

    - by user1182030
    while I was compiling the 2.6.32.8 linux kernel,I got the error message like this: In file included from drivers/net/igbvf/ethtool.c:36:0: drivers/net/igbvf/igbvf.h: At top level: drivers/net/igbvf/igbvf.h:128:15: error: duplicate member ‘page’ make[3]: *** [drivers/net/igbvf/ethtool.o] Error 1 make[2]: *** [drivers/net/igbvf] Error 2 make[1]: *** [drivers/net] Error 2 make: *** [drivers] Error 2 My version of gcc is 4.6.3 and I am using Ubuntu linux (the kernel I am using is 3.2.0.30).I've tried for times but failed,please help!

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  • Read linux kernel version using C?

    - by ipkiss
    Hi, I am using Ubuntu and I want to read the version of its kernel. I found a file named version in /proc/ that records the version of the current kernel. If I dont want to read file, is there any other way, like built-in function in C, that I can read the version in C? Thanks

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  • in kernel and user space

    - by jtzero
    Now I know that developing an app that goes into kernel space should be avoided - its hard to debug, complex etc.... with that off the table what are some advanteages to moving an app from user space to the kernel?

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  • Massive crash and kernel panic after updates yesterday, what now?

    - by Ghost
    Got 12.04 on an AMD+radeon machine, everything was running fine until last night when the update manager installed new packages, and now the moment I open a browser (firefox, chromium, anything) it crashes instantly. It says warning: at build/buildd/linux-3.5.0/arch/x86/kernel/smp.c:123 native_smp_send_reschedule+0x5b/0x60() Pid: 2432, comm: chrome_dbthread tainted: G D 3.5.0-2generic #2-ubuntu I already tried uninstalling the packages from the update log, didn't solve a thing. Depending of which browser I use I get a different reaction, like a complete freeze instead of a text console crash. Ideas? I really don't know what to do.

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  • Changing file permissions in kernel.

    - by Mehrdad
    I am writing kernel module(C in Linux) and I want to change the permission of the other files in it. any solution? since I am in kernel I can't use chmod syscall and ... thanks for your help This is my Makefile: > obj-m += ca.o > > all: > make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules > > clean: > make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean And this is my Code: > #include <linux/string.h> > #include <linux/mm.h> > /* Snip, tons of includes (all of them :))*/ > #include <linux/delay.h> .... int procfile_write(struct file *file, > const char *buffer, unsigned long > count, > void *data) { ... sys_chmod(path, per); ... } ... When Making it gives a warning: WARNING: "sys_chmod" [file] undefiened and when loading the module with "sudo insmod" it gives this error: Unknown sybol in module it seems that this error happens especialy in kernel modules. any idea? again thanks!

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  • Simple OpenCL Kernel

    - by Yuuta
    I'm trying to write a kernel which is a little long but the output is not correct. I took out a lot almost everything and finally narrowed down the an initialization problem and I found that the following works: __kernel void k_sIntegral(__global const float* eData,__global const unsigned long* elements,__global float* area){ const int i = get_global_id(0); if(i < elements[0]){ area[i] = i; } } But the following does not work: __kernel void k_sIntegral(__global const float* eData,__global const unsigned long* elements,__global float* area){ const int i = get_global_id(0); if(i < elements[0]){ __local float a,b,c,j,k,h,s; area[i] = i; } } Using the first kernel, I get: area[1] = 1 Using the second kernel, I get: area[1] = 0 (from calloc) Update: It seems like the code does work, but I need to change the function name otherwise it somehow calls the previous function even though it was not compiled (?). Any leads to why that happens? If anyone can let me know what might be the problem I'll be really grateful, thanks in advance!

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  • Restricting memory area for linux kernel

    - by user1066789
    I am running ltib linux on P1022RDK (P1022 Core) platform. I have 512 MB = 0x20000000 memory. I want my linux kernel to use second half of the board memory (i.e from 256 MB to 512 MB) and want first half of memory to be reserved for some other purpose. For this I am building linux kernel using ltib. For that purpose I am setting following kernel configuration. Please suggest if I am doing it the right way. CONFIG_LOWMEM_SIZE = 0x10000000 # 256 MB CONFIG_PHYSICAL_START = 0x10000000 # Starting from 256MB (second half of memory) On the Uboot I am loading the kernel as following way setenv loadaddr 0x11000000 # Kernel base = 0x10000000 + 0x01000000 (offset) setenv fdtaddr 0x10c00000 # Kernel base = 0x10000000 + 0x00c00000 (offset) bootm $loadaddr - $fdtaddr My kernel Load address is 0x10000000 & kernel entry point is 0x10000000 Doing above configuration / steps my kernel stuck at following on Uboot ## Booting kernel from Legacy Image at 11000000 ... Image Name: Linux-2.6.32.13 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 3352851 Bytes = 3.2 MB Load Address: 10000000 Entry Point: 10000000 Verifying Checksum ... OK ## Flattened Device Tree blob at 10c00000 Booting using the fdt blob at 0x10c00000 Uncompressing Kernel Image ... OK ================ It should uncompress FDT here & continue ============== Any thoughts ?

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  • Linux says a kernel module has an unknown symbol, but another loaded module provides it.

    - by raldi
    I'm trying to install a driver for a USB DAQ box, which annoyingly, I have to compile myself. I believe I've succeeded -- I have two .ko files: -rw-r--r-- 1 root root 45271 2010-03-18 21:24 advdrv_core.ko -rw-r--r-- 1 root root 24312 2010-03-18 21:24 usb4761.ko I was able to run insmod on the first without incident, but when I try on the second, I get a flood of messages: kernel: [686782.106547] usb4761: no symbol version for adv_process_info_check_event kernel: [686782.106555] usb4761: Unknown symbol adv_process_info_check_event kernel: [686782.106691] usb4761: no symbol version for advdrv_unregister_driver kernel: [686782.106695] usb4761: Unknown symbol advdrv_unregister_driver However, advdrv_core.ko provides these symbols. My kernel sure seems to have them in memory: # cat /proc/kallsyms | grep advdrv_unregister_driver f8d88504 r __ksymtab_advdrv_unregister_driver [advdrv_core] f8d888d2 r __kstrtab_advdrv_unregister_driver [advdrv_core] f8d885a4 r __kcrctab_advdrv_unregister_driver [advdrv_core] 086eb8fb a __crc_advdrv_unregister_driver [advdrv_core] f8d86e90 t advdrv_unregister_driver [advdrv_core] Why does my insmod claim they're unknown symbols?

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  • if there are multiple kernel module can drive the same device, what is the rule to choose from them?

    - by Dyno Fu
    both pcnet32 and vmxnet can drive the device. $ lspci -k ... 02:01.0 Ethernet controller: Advanced Micro Devices [AMD] 79c970 [PCnet32 LANCE] (rev 10) Subsystem: Advanced Micro Devices [AMD] 79c970 [PCnet32 LANCE] Flags: bus master, medium devsel, latency 64, IRQ 19 I/O ports at 2000 [size=128] [virtual] Expansion ROM at dc400000 [disabled] [size=64K] Kernel driver in use: vmxnet Kernel modules: vmxnet, pcnet32 both kernel modules are loaded, $ lsmod | grep net pcnet32 32644 0 vmxnet 17696 0 mii 5212 1 pcnet32 as you see, kernel driver in use is vmxnet. is there any policy/algorithm in kernel how to choose from the candidates?

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  • How to become a Kernel/Systems/Device driver programmer?

    - by accordionfolder
    Hello all! I currently work in a professional capacity as a software engineer working with the Android OS. We work at integrating our platform as a native daemon among other facets of the project. I primarily work in Java developing the SDK and Android applications, but get to help with the platform in C/C++. Anywho, I have a great interest to work professionally developing low level for linux. I am not unhappy in my current position and will hang around as long as the company lets me (as a matter of fact I quite enjoy working there!), but I would like to work my way that direction. I've been working through Linux Kernel Development (Robert Love) and The Linux Programming Interface (Michael Kerrisk) (In addition to strengthening my C skills at every chance I get) and casually browsing Monster and similar sites. The problem I see is, there are no entry level positions. How does one break into this field? Anytime I see "Linux Systems Programmer" or "Linux Device Driver Programmer" they all require at the minimum 5-7 years of relevant experience. They want someone who knows the ropes, not a junior level programmer (I've been working for 7 months now...). So, I'm assuming, that some of you on stackoverflow work in a professional capacity doing just what I would like to do. How did you get there? What platforms did you use to work your way there? Am I going to have a more difficult time because I have my bachelors in CSC as opposed to a computer engineer (where they would experience a bit more embedded, asm, etc)?

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  • How do I target a specific driver for libata kernel parameter modding?

    - by DanielSmedegaardBuus
    Sorry for the cryptic title. Not sure how to phrase it. This is it in a nutshell: I'm running a 22-disk setup, 19 of those in a ZFS array, 15 of those backed by three port multipliers attached to SATA controllers driven by the sata_sil24 module. When running full speed (SATA2, i.e. 3 Gbps), the operation is pretty quirky (simple read errors will throw an entire PMP into spasms for a long time, sometimes with pretty awful results). Booting with kernel parameter libata.force=1.5G to force SATA controllers into "legacy" speeds completely fixes all issues with the PMPs. Thing is, my ZFS pool is backed by a fast cache SSD on my ICH10R controller. Another SSD on this same controller holds the system. Doing libata.force=1.5G immediately shaves about 100 MB/s off the transfer rate of my SSDs. For the root drive, that's not such a big deal, but for the ZFS cache SSD, it is. It effectively makes the entire zpool slower for sustained transfers than it would've been without the cache drive. Random access and fs tree lookups, of course still benifit. I'm hoping, though, that there's some way to pass the .force=1.5G parameter on to just the three SATA controllers being backed by the sata_sil24 module. But listing the module options for this, no such option exists. Is this possible? And if so, how? Thanks :)

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  • How can I install Ubuntu's 10.10 kernel I Ubuntu 12.10?

    - by user103533
    I did use Ubuntu 10.10 for a long time, and now I replaced it with Ubuntu 12.10, every thing works great, but I do have one little problem, which is with my wireless card. On Ubuntu 10.10, it worked PERFECTLY, and it even worked better than in windows 7, so I was very happy with Ubuntu 10.10, but, like I said, after installing 12.10, my wireless card doesn't work any more, so I heard that KERNELS are the reason for that. Are kernels the reason for my wireless not working now? If yes then please teach me how to remove my current kernels and install 10.10 kernels. I went to -Additional Drivers- and i found something very weird i took picture and this is what it look like "apply changes" Button NOT active so i can't install driver :( anyway... my Wireless card is WL-138g v2 (remember on Ubuntu 10.10 it was WORKING 100% normally and FREE i did NOT pay for it driver) so... now what shall i do ? it is saying in picture // Using Non-Free firmware for linux kernel drivers from linux-firmware-nonfree (proprietary) // BTW i did "rfkill list" but NO-thing appear under that command.

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  • dpkg reporting as installed, uninstalled kernels

    - by Tony Martin
    I have run the following command to remove old kernels: dpkg -l 'linux-*' | sed '/^ii/!d;/'"$(uname -r | sed "s/\(.*\)-\([^0-9]\+\)/\1/")"'/d;s/^[^ ]* [^ ]* \([^ ]*\).*/\1/;/[0-9]/!d' | xargs sudo apt-get -y purge and only the current kernel is now installed, which I have confirmed in synaptic and by checking my boot partition. However, when I run: dpkg --list | grep linux-image I get the following response: rc linux-image-3.13.0-30-generic 3.13.0-30.55 amd64 Linux kernel image for version 3.13.0 on 64 bit x86 SMP rc linux-image-3.13.0-32-generic 3.13.0-32.57 amd64 Linux kernel image for version 3.13.0 on 64 bit x86 SMP ii linux-image-3.13.0-34-generic 3.13.0-34.60 amd64 Linux kernel image for version 3.13.0 on 64 bit x86 SMP rc linux-image-extra-3.13.0-30-generic 3.13.0-30.55 amd64 Linux kernel extra modules for version 3.13.0 on 64 bit x86 SMP rc linux-image-extra-3.13.0-32-generic 3.13.0-32.57 amd64 Linux kernel extra modules for version 3.13.0 on 64 bit x86 SMP ii linux-image-extra-3.13.0-34-generic 3.13.0-34.60 amd64 Linux kernel extra modules for version 3.13.0 on 64 bit x86 SMP ii linux-image-generic 3.13.0.34.40 amd64 Generic Linux kernel image Probably not a problem, but just wondering why versions -30 and -32 are reported as present. Can it be rectified? TIA

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