Re: reiser4-2.6.18-rc2-mm1: possible circular locking dependency detected in txn_end

[Laurent Riffard <laurent.riffard@free.fr>]

Le 31.07.2006 21:55, Vladimir V. Saveliev a écrit :
> Hello
> 
> What kind of load did you run on reiser4 at that time?

I just formatted a new 2GB Reiser4 FS, then I moved a whole ccache
cache tree to this new FS (cache size was about 20~30 Mbytes).
Something like:

# mkfs.reiser4 /dev/vglinux1/ccache
# mount -tauto -onoatime /dev/vglinux1/ccache /mnt/disk
# mv ~laurent/.ccache/* /mnt/disk/


> On Sun, 2006-07-30 at 20:57 +0200, Laurent Riffard wrote:
>> =======================================================
>> [ INFO: possible circular locking dependency detected ]
>> -------------------------------------------------------
>> mv/29012 is trying to acquire lock:
>>  (&txnh->hlock){--..}, at: [<e0c8e09b>] txn_end+0x191/0x368 [reiser4]
>>
>> but task is already holding lock:
>>  (&atom->alock){--..}, at: [<e0c8a640>] txnh_get_atom+0xf6/0x39e
>> [reiser4]
>>
>> which lock already depends on the new lock.
>>
>>
>> the existing dependency chain (in reverse order) is:
>>
>> -> #1 (&atom->alock){--..}:
>>        [<c012ce2f>] lock_acquire+0x60/0x80
>>        [<c0292968>] _spin_lock+0x19/0x28
>>        [<e0c8bbd7>] try_capture+0x7cf/0x1cd7 [reiser4]
>>        [<e0c786e1>] longterm_lock_znode+0x427/0x84f [reiser4]
>>        [<e0ca55dc>] coord_by_handle+0x2be/0x7f7 [reiser4]
>>        [<e0ca5f89>] coord_by_key+0x1e3/0x22d [reiser4]
>>        [<e0c7dbd2>] insert_by_key+0x8f/0xe0 [reiser4]
>>        [<e0cbf7f1>] write_sd_by_inode_common+0x361/0x61a [reiser4]
>>        [<e0cbfce4>] create_object_common+0xf1/0xf6 [reiser4]
>>        [<e0cbaebf>] create_vfs_object+0x51d/0x732 [reiser4]
>>        [<e0cbb1fd>] mkdir_common+0x43/0x4b [reiser4]
>>        [<c015ed33>] vfs_mkdir+0x5a/0x9d
>>        [<c0160f5e>] sys_mkdirat+0x88/0xc0
>>        [<c0160fa6>] sys_mkdir+0x10/0x12
>>        [<c0102c2d>] sysenter_past_esp+0x56/0x8d
>>
>> -> #0 (&txnh->hlock){--..}:
>>        [<c012ce2f>] lock_acquire+0x60/0x80
>>        [<c0292968>] _spin_lock+0x19/0x28
>>        [<e0c8e09b>] txn_end+0x191/0x368 [reiser4]
>>        [<e0c7f97d>] reiser4_exit_context+0x1c2/0x571 [reiser4]
>>        [<e0cbb091>] create_vfs_object+0x6ef/0x732 [reiser4]
>>        [<e0cbb1fd>] mkdir_common+0x43/0x4b [reiser4]
>>        [<c015ed33>] vfs_mkdir+0x5a/0x9d
>>        [<c0160f5e>] sys_mkdirat+0x88/0xc0
>>        [<c0160fa6>] sys_mkdir+0x10/0x12
>>        [<c0102c2d>] sysenter_past_esp+0x56/0x8d
>>
>> other info that might help us debug this:
>>
>> 2 locks held by mv/29012:
>>  #0:  (&inode->i_mutex/1){--..}, at: [<c015f50b>]
>> lookup_create+0x1d/0x73
>>  #1:  (&atom->alock){--..}, at: [<e0c8a640>]
>> txnh_get_atom+0xf6/0x39e [reiser4]
>>
>> stack backtrace:
>>  [<c0104df0>] show_trace+0xd/0x10
>>  [<c0104e0c>] dump_stack+0x19/0x1d
>>  [<c012bc62>] print_circular_bug_tail+0x59/0x64
>>  [<c012cc3e>] __lock_acquire+0x814/0x9a5
>>  [<c012ce2f>] lock_acquire+0x60/0x80
>>  [<c0292968>] _spin_lock+0x19/0x28
>>  [<e0c8e09b>] txn_end+0x191/0x368 [reiser4]
>>  [<e0c7f97d>] reiser4_exit_context+0x1c2/0x571 [reiser4]
>>  [<e0cbb091>] create_vfs_object+0x6ef/0x732 [reiser4]
>>  [<e0cbb1fd>] mkdir_common+0x43/0x4b [reiser4]
>>  [<c015ed33>] vfs_mkdir+0x5a/0x9d
>>  [<c0160f5e>] sys_mkdirat+0x88/0xc0
>>  [<c0160fa6>] sys_mkdir+0x10/0x12
>>  [<c0102c2d>] sysenter_past_esp+0x56/0x8d
>>
>> (Linux antares.localdomain 2.6.18-rc2-mm1 #77 Sun Jul 30 15:09:34
>> CEST 2006 i686 AMD Athlon(TM) XP 1600+ unknown GNU/Linux)
> 

-- 
laurent