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SubjectJFS - real deadlock and lockdep warning (2.6.18-rc5-mm1)
Hello,

as the subject says it's some time[0] I'm experiencing deadlocks[1] (I'm
only tracking -mm, and sporadically using the stable series). I have a
couple of use cases that seem to reliably trigger the deadlock, namely
using Eclipse and Firefox.

[0]: I'd say at least since 2.6.17-rc-something
[1]: no sysrq, no logs, no nothing, netconsole doesn't log anything
more, just screwed FS which grub can't read (Inconsistent
filesystem - press any key to continue)

I decided to try out the LOCKDEP stuff to see if I can provide more
useful info, and here we go, as soon as my /home (jfs) partition is
written (at login):
[ 72.420000]
[ 72.420000] =============================================
[ 72.420000] [ INFO: possible recursive locking detected ]
[ 72.420000] 2.6.18-rc5-mm1-2-lockdep #9
[ 72.420000] ---------------------------------------------
[ 72.420000] zsh/3844 is trying to acquire lock:
[ 72.420000] (&jfs_ip->commit_mutex){--..}, at: [<c0320948>] mutex_lock+0x8/0x10
[ 72.420000]
[ 72.420000] but task is already holding lock:
[ 72.420000] (&jfs_ip->commit_mutex){--..}, at: [<c0320948>] mutex_lock+0x8/0x10
[ 72.420000]
[ 72.420000] other info that might help us debug this:
[ 72.420000] 2 locks held by zsh/3844:
[ 72.420000] #0: (&inode->i_mutex){--..}, at: [<c0320948>] mutex_lock+0x8/0x10
[ 72.420000] #1: (&jfs_ip->commit_mutex){--..}, at: [<c0320948>] mutex_lock+0x8/0x10
[ 72.420000]
[ 72.420000] stack backtrace:
[ 72.420000] [<c0103b8f>] dump_trace+0x1ef/0x230
[ 72.420000] [<c0103bf6>] show_trace_log_lvl+0x26/0x40
[ 72.420000] [<c01043cb>] show_trace+0x1b/0x20
[ 72.420000] [<c01044b4>] dump_stack+0x24/0x30
[ 72.420000] [<c0136050>] __lock_acquire+0x8e0/0xd80
[ 72.420000] [<c0136869>] lock_acquire+0x69/0x90
[ 72.420000] [<c0320705>] __mutex_lock_slowpath+0x75/0x2b0
[ 72.420000] [<c0320948>] mutex_lock+0x8/0x10
[ 72.420000] [<d137950b>] jfs_create+0xbb/0x420 [jfs]
[ 72.420000] [<c016cb7b>] vfs_create+0xcb/0x120
[ 72.420000] [<c0170158>] open_namei+0x618/0x6f0
[ 72.420000] [<c0162368>] do_filp_open+0x38/0x60
[ 72.420000] [<c01623db>] do_sys_open+0x4b/0xf0
[ 72.420000] [<c01624d7>] sys_open+0x27/0x30
[ 72.420000] [<c01032af>] syscall_call+0x7/0xb
[ 72.420000] [<b7ec8b8d>] 0xb7ec8b8d
[ 72.420000] =======================

I suspect JFS is guilty, anyway my HD has these partitions:

/dev/hda1 on / type reiserfs (rw)
/dev/hda3 on /usr type reiserfs (rw)
/dev/hda5 on /home type jfs (rw)

bootlog: http://oioio.altervista.org/linux/dmesg-2.6.18-rc5-mm1-lockdep
config: http://oioio.altervista.org/linux/config-2.6.18-rc5-mm1-lockdep

--
mattia
:wq!
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