kernel 2.6.21-1.3116.fc7 possible circular locking dependency

[Thomas M Steenholdt]

Alexandru Ciobanu wrote:
> Upon booting 2.6.21 kernel on my HP500 notebook I get a kind of weid 
> info message which I've pasted below.
> I'm using a custom 2.6.21-1.3116 kernel [I've included a small patch in 
> drivers/input/serio/i8042.c to get my touchpad going (BZ #230595)] and 
> reiserfs for filesystem. I'm not experiencing any problems with my 
> system and I definitely have no ideea what this error(?) is about.
> Any ideas?
> 
> =======================================================
> [ INFO: possible circular locking dependency detected ]
> 2.6.21-1.3116ics.fc7 #1
> -------------------------------------------------------
> chgrp/1221 is trying to acquire lock:
>  (&REISERFS_SB(s)->xattr_dir_sem){..--}, at: [<e00e6c6c>] 
> reiserfs_chown_xattrs+0x4e/0x106 [reiserfs]
> 
> but task is already holding lock:
>  (&inode->i_mutex){--..}, at: [<c0614c6a>] mutex_lock+0x21/0x24
> 
> which lock already depends on the new lock.
> 
> 
> the existing dependency chain (in reverse order) is:
> -> #1 (&inode->i_mutex){--..}:
>        [<c044299f>] __lock_acquire+0xa19/0xba4
>        [<c0442f1c>] lock_acquire+0x56/0x6f
>        [<c0614ad2>] __mutex_lock_slowpath+0xf7/0x26e
>        [<c0614c6a>] mutex_lock+0x21/0x24
>        [<e00e5f54>] get_xa_root+0x4a/0x10b [reiserfs]
>        [<e00e604c>] open_xa_dir+0x19/0xde [reiserfs]
>        [<e00e716e>] reiserfs_delete_xattrs+0x58/0x160 [reiserfs]
>        [<e00cc07b>] reiserfs_delete_inode+0x5d/0xe8 [reiserfs]
>        [<c048f6ca>] generic_delete_inode+0xa6/0x110
>        [<c048f746>] generic_drop_inode+0x12/0x130
>        [<c048ed32>] iput+0x63/0x66
>        [<c0487305>] do_unlinkat+0xb6/0x123
>        [<c0487382>] sys_unlink+0x10/0x12
>        [<c0405078>] syscall_call+0x7/0xb
>        [<ffffffff>] 0xffffffff
> 
> -> #0 (&REISERFS_SB(s)->xattr_dir_sem){..--}:
>        [<c0442883>] __lock_acquire+0x8fd/0xba4
>        [<c0442f1c>] lock_acquire+0x56/0x6f
>        [<c043b7fc>] down_read+0x3f/0x51
>        [<e00e6c6c>] reiserfs_chown_xattrs+0x4e/0x106 [reiserfs]
>        [<e00cbedb>] reiserfs_setattr+0x115/0x258 [reiserfs]
>        [<c04901a3>] notify_change+0x127/0x2c8
>        [<c047d232>] chown_common+0x93/0xa6
>        [<c047d3d6>] sys_chown+0x34/0x46
>        [<c0405078>] syscall_call+0x7/0xb
>        [<ffffffff>] 0xffffffff
> 
> other info that might help us debug this:
> 
> 1 lock held by chgrp/1221:
>  #0:  (&inode->i_mutex){--..}, at: [<c0614c6a>] mutex_lock+0x21/0x24
> 
> stack backtrace:
>  [<c04061e9>] show_trace_log_lvl+0x1a/0x2f
>  [<c04067ad>] show_trace+0x12/0x14
>  [<c0406831>] dump_stack+0x16/0x18
>  [<c0441096>] print_circular_bug_tail+0x5f/0x68
>  [<c0442883>] __lock_acquire+0x8fd/0xba4
>  [<c0442f1c>] lock_acquire+0x56/0x6f
>  [<c043b7fc>] down_read+0x3f/0x51
>  [<e00e6c6c>] reiserfs_chown_xattrs+0x4e/0x106 [reiserfs]
>  [<e00cbedb>] reiserfs_setattr+0x115/0x258 [reiserfs]
>  [<c04901a3>] notify_change+0x127/0x2c8
>  [<c047d232>] chown_common+0x93/0xa6
>  [<c047d3d6>] sys_chown+0x34/0x46
>  [<c0405078>] syscall_call+0x7/0xb
>  =======================
> 

AFAICT, this problem has reiserfs written all over it. You should take 
this to kernel.org, since reiserfs is not supported in fedora...

Hope this helps.

/Thomas