In an attempt to debug another kernel issue I turned on the lock validator and
managed to generate this report.
As a side note the first attempt to boot with the lock validator failed with
a message indicating I had exceeded MAX_LOCK_DEPTH. To get this trace
I patched sched.h: MAX_LOCK_DEPTH to 60.
Dec 1 08:35:41 reforged [ 3052.513931] =========================
Dec 1 08:35:41 reforged [ 3052.513937] [ BUG: held lock freed! ]
Dec 1 08:35:41 reforged [ 3052.513939] -------------------------
Dec 1 08:35:41 reforged [ 3052.513943] kswapd0/183 is freeing memory
c3458000-c3458fff, with a lock still held there! Dec 1 08:35:41
reforged [ 3052.513947] (&(&ip->i_iolock)->mr_lock){....}, at:
[<c0222289>] xfs_ilock+0x20/0x75 Dec 1 08:35:41 reforged
[ 3052.513959] 28 locks held by kswapd0/183: Dec 1 08:35:41 reforged
[ 3052.513961] #0: (&(&ip->i_iolock)->mr_lock){....}, at:
[<c0222289>] xfs_ilock+0x20/0x75 Dec 1 08:35:41 reforged
[ 3052.513968] #1: (&(&ip->i_lock)->mr_lock){....}, at: [<c02222bb>]
xfs_ilock+0x52/0x75 Dec 1 08:35:41 reforged [ 3052.513975]
[ 3052.514136] stack backtrace: Dec 1 08:35:41 reforged
[ 3052.514139] [<c0103cb9>] show_trace+0x16/0x19 Dec 1 08:35:41
reforged [ 3052.514146] [<c01040f7>] dump_stack+0x1a/0x1f Dec 1
08:35:41 reforged [ 3052.514150] [<c012be74>]
debug_check_no_locks_freed+0xe0/0xff Dec 1 08:35:41 reforged
[ 3052.514159] [<c014122d>] free_hot_cold_page+0x96/0x109 Dec 1
08:35:41 reforged [ 3052.514166] [<c01412bc>] __pagevec_free+0x1c/0x27
Dec 1 08:35:41 reforged [ 3052.514170] [<c01435dc>]
__pagevec_release_nonlru+0x65/0x71 Dec 1 08:35:41 reforged
[ 3052.514176] [<c0144702>] shrink_inactive_list+0x4b1/0x722 Dec 1
08:35:41 reforged [ 3052.514181] [<c0144a2d>] shrink_zone+0xba/0xd9
Dec 1 08:35:41 reforged [ 3052.514185] [<c0144e9e>]
kswapd+0x26a/0x361 Dec 1 08:35:41 reforged [ 3052.514189]
[<c012742b>] kthread+0xb0/0xe1 Dec 1 08:35:41 reforged [ 3052.514192]
[<c0101005>] kernel_thread_helper+0x5/0xb reforged log #
Linux reforged 2.6.18.3 #4 PREEMPT Fri Dec 1 06:15:05 PST 2006 i686 AMD Athlon(tm) XP 3000+ AuthenticAMD GNU/Linux