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SubjectWhich kernel options should be enabled to find the root cause of this bug?


On Sat, 17 Oct 2009, Justin Piszcz wrote:

> Hello,
>
> I have a system I recently upgraded from 2.6.30.x and after approximately
> 24-48 hours--sometimes longer, the system cannot write any more files to disk
> (luckily though I can still write to /dev/shm) -- to which I have
> saved the sysrq-t and sysrq-w output:
>
> http://home.comcast.net/~jpiszcz/20091017/sysrq-w.txt
> http://home.comcast.net/~jpiszcz/20091017/sysrq-t.txt
>
> Configuration:
>
> $ cat /proc/mdstat Personalities : [raid1] [raid6] [raid5] [raid4] md1 :
> active raid1 sdb2[1] sda2[0]
> 136448 blocks [2/2] [UU]
>
> md2 : active raid1 sdb3[1] sda3[0]
> 129596288 blocks [2/2] [UU]
>
> md3 : active raid5 sdj1[7] sdi1[6] sdh1[5] sdf1[3] sdg1[4] sde1[2] sdd1[1]
> sdc1[0]
> 5128001536 blocks level 5, 1024k chunk, algorithm 2 [8/8] [UUUUUUUU]
>
> md0 : active raid1 sdb1[1] sda1[0]
> 16787776 blocks [2/2] [UU]
>
> $ mount
> /dev/md2 on / type xfs (rw,noatime,nobarrier,logbufs=8,logbsize=262144)
> tmpfs on /lib/init/rw type tmpfs (rw,nosuid,mode=0755)
> proc on /proc type proc (rw,noexec,nosuid,nodev)
> sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
> udev on /dev type tmpfs (rw,mode=0755)
> tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
> devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=620)
> /dev/md1 on /boot type ext3 (rw,noatime)
> /dev/md3 on /r/1 type xfs (rw,noatime,nobarrier,logbufs=8,logbsize=262144)
> rpc_pipefs on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
> nfsd on /proc/fs/nfsd type nfsd (rw)
>
> Distribution: Debian Testing
> Arch: x86_64
>
> The problem occurs with 2.6.31 and I upgraded to 2.6.31.4 and the problem
> persists.
>
> Here is a snippet of two processes in D-state, the first was not doing
> anything, the second was mrtg.
>
> [121444.684000] pickup D 0000000000000003 0 18407 4521
> 0x00000000
> [121444.684000] ffff880231dd2290 0000000000000086 0000000000000000
> 0000000000000000
> [121444.684000] 000000000000ff40 000000000000c8c8 ffff880176794d10
> ffff880176794f90
> [121444.684000] 000000032266dd08 ffff8801407a87f0 ffff8800280878d8
> ffff880176794f90
> [121444.684000] Call Trace:
> [121444.684000] [<ffffffff810a742d>] ? free_pages_and_swap_cache+0x9d/0xc0
> [121444.684000] [<ffffffff81454866>] ? __mutex_lock_slowpath+0xd6/0x160
> [121444.684000] [<ffffffff814546ba>] ? mutex_lock+0x1a/0x40
> [121444.684000] [<ffffffff810b26ef>] ? generic_file_llseek+0x2f/0x70
> [121444.684000] [<ffffffff810b119e>] ? sys_lseek+0x7e/0x90
> [121444.684000] [<ffffffff8109ffd2>] ? sys_munmap+0x52/0x80
> [121444.684000] [<ffffffff8102c52b>] ? system_call_fastpath+0x16/0x1b
>
> [121444.684000] rateup D 0000000000000000 0 18538 18465
> 0x00000000
> [121444.684000] ffff88023f8a8c10 0000000000000082 0000000000000000
> ffff88023ea09ec8
> [121444.684000] 000000000000ff40 000000000000c8c8 ffff88023faace50
> ffff88023faad0d0
> [121444.684000] 0000000300003e00 000000010720cc78 0000000000003e00
> ffff88023faad0d0
> [121444.684000] Call Trace:
> [121444.684000] [<ffffffff811f42e2>] ? xfs_buf_iorequest+0x42/0x90
> [121444.684000] [<ffffffff811dd66d>] ? xlog_bdstrat_cb+0x3d/0x50
> [121444.684000] [<ffffffff811db05b>] ? xlog_sync+0x20b/0x4e0
> [121444.684000] [<ffffffff811dc44c>] ? xlog_state_sync+0x26c/0x2a0
> [121444.684000] [<ffffffff810513e0>] ? default_wake_function+0x0/0x10
> [121444.684000] [<ffffffff811dc4d1>] ? _xfs_log_force+0x51/0x80
> [121444.684000] [<ffffffff811dc50b>] ? xfs_log_force+0xb/0x40
> [121444.684000] [<ffffffff811a7223>] ? xfs_alloc_ag_vextent+0x123/0x130
> [121444.684000] [<ffffffff811a7aa8>] ? xfs_alloc_vextent+0x368/0x4b0
> [121444.684000] [<ffffffff811b41e8>] ? xfs_bmap_btalloc+0x598/0xa40
> [121444.684000] [<ffffffff811b6a42>] ? xfs_bmapi+0x9e2/0x11a0
> [121444.684000] [<ffffffff811dd7f0>] ? xlog_grant_push_ail+0x30/0xf0
> [121444.684000] [<ffffffff811e8fd8>] ? xfs_trans_reserve+0xa8/0x220
> [121444.684000] [<ffffffff811d805e>] ? xfs_iomap_write_allocate+0x23e/0x3b0
> [121444.684000] [<ffffffff811f0daf>] ? __xfs_get_blocks+0x8f/0x220
> [121444.684000] [<ffffffff811d8c00>] ? xfs_iomap+0x2c0/0x300
> [121444.684000] [<ffffffff810d5b76>] ? __set_page_dirty+0x66/0xd0
> [121444.684000] [<ffffffff811f0d15>] ? xfs_map_blocks+0x25/0x30
> [121444.684000] [<ffffffff811f1e04>] ? xfs_page_state_convert+0x414/0x6c0
> [121444.684000] [<ffffffff811f23b7>] ? xfs_vm_writepage+0x77/0x130
> [121444.684000] [<ffffffff8108b21a>] ? __writepage+0xa/0x40
> [121444.684000] [<ffffffff8108baff>] ? write_cache_pages+0x1df/0x3c0
> [121444.684000] [<ffffffff8108b210>] ? __writepage+0x0/0x40
> [121444.684000] [<ffffffff810b1533>] ? do_sync_write+0xe3/0x130
> [121444.684000] [<ffffffff8108bd30>] ? do_writepages+0x20/0x40
> [121444.684000] [<ffffffff81085abd>] ? __filemap_fdatawrite_range+0x4d/0x60
> [121444.684000] [<ffffffff811f54dd>] ? xfs_flush_pages+0xad/0xc0
> [121444.684000] [<ffffffff811ee907>] ? xfs_release+0x167/0x1d0
> [121444.684000] [<ffffffff811f52b0>] ? xfs_file_release+0x10/0x20
> [121444.684000] [<ffffffff810b2c0d>] ? __fput+0xcd/0x1e0
> [121444.684000] [<ffffffff810af556>] ? filp_close+0x56/0x90
> [121444.684000] [<ffffffff810af636>] ? sys_close+0xa6/0x100
> [121444.684000] [<ffffffff8102c52b>] ? system_call_fastpath+0x16/0x1b
>
> Anyone know what is going on here?
>
> Justin.
>

In addition to using netconsole, which kernel options should be enabled
to better diagnose this issue?

Should I enable these to help track down this bug?

[ ] XFS Debugging support (EXPERIMENTAL)
[ ] Compile the kernel with frame pointers

Are there any other options that will help determine the root cause of this
bug that are recommended?

Justin.




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