hi
Here is what i got suddently. But seems everything is working.
If any other information required, please let me know.
/dev/md2 on / type xfs (rw,noatime)
[39993.560200]
[39993.560202] =======================================================
[39993.560206] [ INFO: possible circular locking dependency detected ]
[39993.560208] 2.6.29-rc8-home1 #2
[39993.560210] -------------------------------------------------------
[39993.560212] kmail/5077 is trying to acquire lock:
[39993.560214] (&(&ip->i_iolock)->mr_lock){----}, at: [<ffffffff811426aa>]
xfs_ilock+0x27/0x79
[39993.560222]
[39993.560223] but task is already holding lock:
[39993.560225] (&mm->mmap_sem){----}, at: [<ffffffff81095090>]
sys_munmap+0x32/0x59
[39993.560230]
[39993.560231] which lock already depends on the new lock.
[39993.560232]
[39993.560233]
[39993.560234] the existing dependency chain (in reverse order) is:
[39993.560236]
[39993.560236] -> #1 (&mm->mmap_sem){----}:
[39993.560240] [<ffffffff8105b9fc>] __lock_acquire+0x12b0/0x161a
[39993.560244] [<ffffffff8105bdbb>] lock_acquire+0x55/0x71
[39993.560247] [<ffffffff813fc2a5>] down_read+0x34/0x41
[39993.560252] [<ffffffff813ffbfe>] do_page_fault+0x3fa/0x848
[39993.560256] [<ffffffff813fda2f>] page_fault+0x1f/0x30
[39993.560258] [<ffffffff8107e13d>] generic_file_aio_read+0x35f/0x5da
[39993.560268] [<ffffffff811650d8>] xfs_read+0x17d/0x1f5
[39993.560272] [<ffffffff81161646>] xfs_file_aio_read+0x5f/0x61
[39993.560275] [<ffffffff810a88ff>] do_sync_read+0xe7/0x12d
[39993.560284] [<ffffffff810a928c>] vfs_read+0xab/0x134
[39993.560287] [<ffffffff810a93d9>] sys_read+0x47/0x6f
[39993.560289] [<ffffffff8100c0db>] system_call_fastpath+0x16/0x1b
[39993.560293] [<ffffffffffffffff>] 0xffffffffffffffff
[39993.560302]
[39993.560302] -> #0 (&(&ip->i_iolock)->mr_lock){----}:
[39993.560306] [<ffffffff8105b6cb>] __lock_acquire+0xf7f/0x161a
[39993.560309] [<ffffffff8105bdbb>] lock_acquire+0x55/0x71
[39993.560312] [<ffffffff8104ebde>] down_write_nested+0x37/0x46
[39993.560316] [<ffffffff811426aa>] xfs_ilock+0x27/0x79
[39993.560318] [<ffffffff8115b40e>] xfs_inactive+0x14d/0x411
[39993.560322] [<ffffffff8116552f>] xfs_fs_clear_inode+0x83/0x85
[39993.560325] [<ffffffff810ba8f7>] clear_inode+0x8a/0xe3
[39993.560329] [<ffffffff810bb044>] generic_delete_inode+0xf8/0x173
[39993.560332] [<ffffffff810bb0d6>] generic_drop_inode+0x17/0x1d5
[39993.560335] [<ffffffff810ba1c7>] iput+0x61/0x65
[39993.560338] [<ffffffff810b7554>] dentry_iput+0xa9/0xc1
[39993.560341] [<ffffffff810b7651>] d_kill+0x40/0x60
[39993.560344] [<ffffffff810b942d>] dput+0x141/0x14e
[39993.560347] [<ffffffff810a9a85>] __fput+0x173/0x198
[39993.560350] [<ffffffff810a9ac2>] fput+0x18/0x1a
[39993.560353] [<ffffffff8109411e>] remove_vma+0x3e/0x63
[39993.560355] [<ffffffff8109503c>] do_munmap+0x2e9/0x30b
[39993.560358] [<ffffffff8109509e>] sys_munmap+0x40/0x59
[39993.560361] [<ffffffff8100c0db>] system_call_fastpath+0x16/0x1b
[39993.560363] [<ffffffffffffffff>] 0xffffffffffffffff
[39993.560366]
[39993.560367] other info that might help us debug this:
[39993.560368]
[39993.560370] 1 lock held by kmail/5077:
[39993.560371] #0: (&mm->mmap_sem){----}, at: [<ffffffff81095090>]
sys_munmap+0x32/0x59
[39993.560376]
[39993.560377] stack backtrace:
[39993.560379] Pid: 5077, comm: kmail Not tainted 2.6.29-rc8-home1 #2
[39993.560381] Call Trace:
[39993.560384] [<ffffffff8105a366>] print_circular_bug_tail+0xc5/0xd0
[39993.560388] [<ffffffff8105b6cb>] __lock_acquire+0xf7f/0x161a
[39993.560391] [<ffffffff8105bdbb>] lock_acquire+0x55/0x71
[39993.560393] [<ffffffff811426aa>] ? xfs_ilock+0x27/0x79
[39993.560396] [<ffffffff8104ebde>] down_write_nested+0x37/0x46
[39993.560399] [<ffffffff811426aa>] ? xfs_ilock+0x27/0x79
[39993.560401] [<ffffffff811426aa>] xfs_ilock+0x27/0x79
[39993.560404] [<ffffffff8115b40e>] xfs_inactive+0x14d/0x411
[39993.560407] [<ffffffff8116552f>] xfs_fs_clear_inode+0x83/0x85
[39993.560410] [<ffffffff810ba8f7>] clear_inode+0x8a/0xe3
[39993.560413] [<ffffffff810bb044>] generic_delete_inode+0xf8/0x173
[39993.560416] [<ffffffff810bb0d6>] generic_drop_inode+0x17/0x1d5
[39993.560419] [<ffffffff810ba1c7>] iput+0x61/0x65
[39993.560421] [<ffffffff810b7554>] dentry_iput+0xa9/0xc1
[39993.560424] [<ffffffff810b7651>] d_kill+0x40/0x60
[39993.560427] [<ffffffff810b942d>] dput+0x141/0x14e
[39993.560429] [<ffffffff810a9a85>] __fput+0x173/0x198
[39993.560432] [<ffffffff810a9ac2>] fput+0x18/0x1a
[39993.560434] [<ffffffff8109411e>] remove_vma+0x3e/0x63
[39993.560437] [<ffffffff8109503c>] do_munmap+0x2e9/0x30b
[39993.560440] [<ffffffff8109509e>] sys_munmap+0x40/0x59
[39993.560442] [<ffffffff8100c0db>] system_call_fastpath+0x16/0x1b
[ changed cc to [email protected]. [email protected] does not
exist. ]
On Sun, Mar 15, 2009 at 02:59:01PM +0200, Denys Fedoryschenko wrote:
> hi
>
> Here is what i got suddently. But seems everything is working.
> If any other information required, please let me know.
Known issue.
> [39993.560234] the existing dependency chain (in reverse order) is:
> [39993.560236]
> [39993.560236] -> #1 (&mm->mmap_sem){----}:
> [39993.560240] [<ffffffff8105b9fc>] __lock_acquire+0x12b0/0x161a
> [39993.560244] [<ffffffff8105bdbb>] lock_acquire+0x55/0x71
> [39993.560247] [<ffffffff813fc2a5>] down_read+0x34/0x41
> [39993.560252] [<ffffffff813ffbfe>] do_page_fault+0x3fa/0x848
> [39993.560256] [<ffffffff813fda2f>] page_fault+0x1f/0x30
> [39993.560258] [<ffffffff8107e13d>] generic_file_aio_read+0x35f/0x5da
> [39993.560268] [<ffffffff811650d8>] xfs_read+0x17d/0x1f5
> [39993.560272] [<ffffffff81161646>] xfs_file_aio_read+0x5f/0x61
> [39993.560275] [<ffffffff810a88ff>] do_sync_read+0xe7/0x12d
> [39993.560284] [<ffffffff810a928c>] vfs_read+0xab/0x134
> [39993.560287] [<ffffffff810a93d9>] sys_read+0x47/0x6f
> [39993.560289] [<ffffffff8100c0db>] system_call_fastpath+0x16/0x1b
> [39993.560293] [<ffffffffffffffff>] 0xffffffffffffffff
> [39993.560302]
> [39993.560302] -> #0 (&(&ip->i_iolock)->mr_lock){----}:
> [39993.560306] [<ffffffff8105b6cb>] __lock_acquire+0xf7f/0x161a
> [39993.560309] [<ffffffff8105bdbb>] lock_acquire+0x55/0x71
> [39993.560312] [<ffffffff8104ebde>] down_write_nested+0x37/0x46
> [39993.560316] [<ffffffff811426aa>] xfs_ilock+0x27/0x79
> [39993.560318] [<ffffffff8115b40e>] xfs_inactive+0x14d/0x411
> [39993.560322] [<ffffffff8116552f>] xfs_fs_clear_inode+0x83/0x85
> [39993.560325] [<ffffffff810ba8f7>] clear_inode+0x8a/0xe3
> [39993.560329] [<ffffffff810bb044>] generic_delete_inode+0xf8/0x173
> [39993.560332] [<ffffffff810bb0d6>] generic_drop_inode+0x17/0x1d5
> [39993.560335] [<ffffffff810ba1c7>] iput+0x61/0x65
> [39993.560338] [<ffffffff810b7554>] dentry_iput+0xa9/0xc1
> [39993.560341] [<ffffffff810b7651>] d_kill+0x40/0x60
> [39993.560344] [<ffffffff810b942d>] dput+0x141/0x14e
> [39993.560347] [<ffffffff810a9a85>] __fput+0x173/0x198
> [39993.560350] [<ffffffff810a9ac2>] fput+0x18/0x1a
> [39993.560353] [<ffffffff8109411e>] remove_vma+0x3e/0x63
> [39993.560355] [<ffffffff8109503c>] do_munmap+0x2e9/0x30b
> [39993.560358] [<ffffffff8109509e>] sys_munmap+0x40/0x59
> [39993.560361] [<ffffffff8100c0db>] system_call_fastpath+0x16/0x1b
> [39993.560363] [<ffffffffffffffff>] 0xffffffffffffffff
This is a VM problem where it calls fput() with the mmap_sem() held
in remove_vma(). It makes the incorrect assumption that filesystems
will never use the same lock in the IO path and the inode release path.
This can deadlock if you are really unlucky.
Cheers,
Dave.
--
Dave Chinner
[email protected]