with 2.6.20 and almost all debugging options I get this:
[ 293.840172] =============================================
[ 293.847880] [ INFO: possible recursive locking detected ]
[ 293.853862] 2.6.20.3-debug #11
[ 293.857288] ---------------------------------------------
[ 293.863243] dd/6202 is trying to acquire lock:
[ 293.868192] (&(&ip->i_lock)->mr_lock){----}, at: [<ffffffff881693a6>]
xfs_ilock+0x56/0x7a [xfs]
[ 293.878200]
[ 293.878201] but task is already holding lock:
[ 293.884788] (&(&ip->i_lock)->mr_lock){----}, at: [<ffffffff881693a6>]
xfs_ilock+0x56/0x7a [xfs]
[ 293.894802]
[ 293.894803] other info that might help us debug this:
[ 293.902116] 2 locks held by dd/6202:
[ 293.906114] #0: (&inode->i_mutex){--..}, at: [<ffffffff804adbbd>]
mutex_lock+0x23/0x27
[ 293.915438] #1: (&(&ip->i_lock)->mr_lock){----}, at: [<ffffffff881693a6>]
xfs_ilock+0x56/0x7a [xfs]
[ 293.925977]
[ 293.925978] stack backtrace:
[ 293.930948]
[ 293.930949] Call Trace:
[ 293.935457] [<ffffffff8024325a>] __lock_acquire+0x44d/0xc60
[ 293.941707] [<ffffffff80242699>] mark_held_locks+0x5a/0x71
[ 293.956483] [<ffffffff881693a6>] :xfs:xfs_ilock+0x56/0x7a
[ 293.962537] [<ffffffff80243e94>] lock_acquire+0x7c/0xa0
[ 293.968447] [<ffffffff881693a6>] :xfs:xfs_ilock+0x56/0x7a
[ 293.974510] [<ffffffff8023f6cb>] down_write+0x33/0x3f
[ 293.980236] [<ffffffff881693a6>] :xfs:xfs_ilock+0x56/0x7a
[ 293.986315] [<ffffffff88169895>] :xfs:xfs_iget+0x43c/0x7a8
[ 293.992509] [<ffffffff8817f4ad>] :xfs:xfs_trans_iget+0xa9/0x115
[ 293.999177] [<ffffffff8816aa74>] :xfs:xfs_ialloc+0x91/0x453
[ 294.005475] [<ffffffff8817fd6a>] :xfs:xfs_dir_ialloc+0x74/0x286
[ 294.012145] [<ffffffff88184b4b>] :xfs:xfs_create+0x347/0x626
[ 294.018532] [<ffffffff8818ee57>] :xfs:xfs_vn_mknod+0x1e2/0x432
[ 294.025077] [<ffffffff8023f733>] up_read+0x24/0x28
[ 294.030501] [<ffffffff88169f69>] :xfs:xfs_iunlock+0x74/0x79
[ 294.036788] [<ffffffff881837d1>] :xfs:xfs_access+0x43/0x4e
[ 294.042943] [<ffffffff80243a15>] __lock_acquire+0xc08/0xc60
[ 294.049200] [<ffffffff804afa5b>] _spin_unlock_irqrestore+0x3f/0x47
[ 294.056083] [<ffffffff80242699>] mark_held_locks+0x5a/0x71
[ 294.062239] [<ffffffff804afa5b>] _spin_unlock_irqrestore+0x3f/0x47
[ 294.069138] [<ffffffff802428a5>] trace_hardirqs_on+0x129/0x154
[ 294.075690] [<ffffffff881837d1>] :xfs:xfs_access+0x43/0x4e
[ 294.081883] [<ffffffff8818f0b2>] :xfs:xfs_vn_create+0xb/0xd
[ 294.088139] [<ffffffff80281eeb>] vfs_create+0xb7/0xfb
[ 294.093826] [<ffffffff80282342>] open_namei+0x1d1/0x6d3
[ 294.099717] [<ffffffff80243a15>] __lock_acquire+0xc08/0xc60
[ 294.105970] [<ffffffff80278796>] do_filp_open+0x5b/0x7e
[ 294.111851] [<ffffffff80278b2a>] do_sys_open+0x4d/0xd4
[ 294.117636] [<ffffffff80278bcc>] sys_open+0x1b/0x1d
[ 294.123128] [<ffffffff8020965e>] system_call+0x7e/0x83
[ 294.128913]
Thanks,
Bernd
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