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Description of problem: I found this in /var/log/messages: Sep 29 12:18:31 X kernel: Sep 29 12:18:31 X kernel: ============================================= Sep 29 12:18:31 X kernel: [ INFO: possible recursive locking detected ] Sep 29 12:18:31 X kernel: 2.6.18-1.2189.fc5 #1 Sep 29 12:18:31 X kernel: --------------------------------------------- Sep 29 12:18:31 X kernel: kswapd0/157 is trying to acquire lock: Sep 29 12:18:31 X kernel: (&(&ip->i_lock)->mr_lock){----}, at: [<e112617c>] xfs_ilock+0x63/0x68 [xfs] Sep 29 12:18:31 X kernel: Sep 29 12:18:31 X kernel: but task is already holding lock: Sep 29 12:18:31 X kernel: (&(&ip->i_lock)->mr_lock){----}, at: [<e1126163>] xfs_ilock+0x4a/0x68 [xfs] Sep 29 12:18:31 X kernel: Sep 29 12:18:31 X kernel: other info that might help us debug this: Sep 29 12:18:31 X kernel: 4 locks held by kswapd0/157: Sep 29 12:18:31 X kernel: #0: (shrinker_rwsem){----}, at: [<c04504b3>] shrink_slab+0x25/0x123 Sep 29 12:18:31 X kernel: #1: (iprune_mutex){--..}, at: [<c05f9dec>] mutex_lock+0x21/0x24 Sep 29 12:18:31 X kernel: #2: (&(&ip->i_iolock)->mr_lock){----}, at: [<e1126135>] xfs_ilock+0x1c/0x68 [xfs] Sep 29 12:18:31 X kernel: #3: (&(&ip->i_lock)->mr_lock){----}, at: [<e1126163>] xfs_ilock+0x4a/0x68 [xfs] Sep 29 12:18:31 X kernel: Sep 29 12:18:31 X kernel: stack backtrace: Sep 29 12:18:31 X kernel: [<c0403f8d>] show_trace_log_lvl+0x58/0x16a Sep 29 12:18:31 X kernel: [<c0404565>] show_trace+0xd/0x10 Sep 29 12:18:31 X kernel: [<c0404602>] dump_stack+0x19/0x1b Sep 29 12:18:31 X kernel: [<c04310d8>] __lock_acquire+0x75f/0x986 Sep 29 12:18:31 X kernel: [<c0431870>] lock_acquire+0x4b/0x6b Sep 29 12:18:31 X kernel: [<c042e94c>] down_read+0x2d/0x3f Sep 29 12:18:31 X kernel: [<e112617c>] xfs_ilock+0x63/0x68 [xfs] Sep 29 12:18:31 X kernel: [<e113f19f>] xfs_inactive_free_eofblocks+0x97/0x1fe [xfs] Sep 29 12:18:31 X kernel: [<e1143f18>] xfs_inactive+0x171/0x9af [xfs] Sep 29 12:18:31 X kernel: [<e114cfdd>] xfs_fs_clear_inode+0x31/0x6d [xfs] Sep 29 12:18:31 X kernel: [<c047a5df>] clear_inode+0xd8/0x129 Sep 29 12:18:31 X kernel: [<c047a8b4>] dispose_list+0x3c/0xc1 Sep 29 12:18:31 X kernel: [<c047aaac>] shrink_icache_memory+0x173/0x19b Sep 29 12:18:31 X kernel: [<c045055e>] shrink_slab+0xd0/0x123 Sep 29 12:18:31 X kernel: [<c0450896>] kswapd+0x260/0x336 Sep 29 12:18:31 X kernel: [<c042bf87>] kthread+0xb0/0xdd Sep 29 12:18:31 X kernel: [<c0401005>] kernel_thread_helper+0x5/0xb Sep 29 12:18:31 X kernel: DWARF2 unwinder stuck at kernel_thread_helper+0x5/0xb Sep 29 12:18:31 X kernel: Leftover inexact backtrace: Sep 29 12:18:31 X kernel: [<c0404565>] show_trace+0xd/0x10 Sep 29 12:18:31 X kernel: [<c0404602>] dump_stack+0x19/0x1b Sep 29 12:18:31 X kernel: [<c04310d8>] __lock_acquire+0x75f/0x986 Sep 29 12:18:32 X kernel: [<c0431870>] lock_acquire+0x4b/0x6b Sep 29 12:18:32 X kernel: [<c042e94c>] down_read+0x2d/0x3f Sep 29 12:18:32 X kernel: [<e112617c>] xfs_ilock+0x63/0x68 [xfs] Sep 29 12:18:32 X kernel: [<e113f19f>] xfs_inactive_free_eofblocks+0x97/0x1fe [xfs] Sep 29 12:18:32 X kernel: [<e1143f18>] xfs_inactive+0x171/0x9af [xfs] Sep 29 12:18:32 X kernel: [<e114cfdd>] xfs_fs_clear_inode+0x31/0x6d [xfs] Sep 29 12:18:32 X kernel: [<c047a5df>] clear_inode+0xd8/0x129 Sep 29 12:18:32 X kernel: [<c047a8b4>] dispose_list+0x3c/0xc1 Sep 29 12:18:32 X kernel: [<c047aaac>] shrink_icache_memory+0x173/0x19b Sep 29 12:18:32 X kernel: [<c045055e>] shrink_slab+0xd0/0x123 Sep 29 12:18:32 X kernel: [<c0450896>] kswapd+0x260/0x336 Sep 29 12:18:32 X kernel: [<c042bf87>] kthread+0xb0/0xdd Sep 29 12:18:32 X kernel: [<c0401005>] kernel_thread_helper+0x5/0xb Version-Release number of selected component (if applicable): kernel-2.6.18-1.2189.fc5
The xfs guys have done some lockdep work, I'll see what they've got so far. In the meantime, this looks like a false positive. -Eric
A new kernel update has been released (Version: 2.6.18-1.2200.fc5) based upon a new upstream kernel release. Please retest against this new kernel, as a large number of patches go into each upstream release, possibly including changes that may address this problem. This bug has been placed in NEEDINFO state. Due to the large volume of inactive bugs in bugzilla, if this bug is still in this state in two weeks time, it will be closed. Should this bug still be relevant after this period, the reporter can reopen the bug at any time. Any other users on the Cc: list of this bug can request that the bug be reopened by adding a comment to the bug. In the last few updates, some users upgrading from FC4->FC5 have reported that installing a kernel update has left their systems unbootable. If you have been affected by this problem please check you only have one version of device-mapper & lvm2 installed. See bug 207474 for further details. If this bug is a problem preventing you from installing the release this version is filed against, please see bug 169613. If this bug has been fixed, but you are now experiencing a different problem, please file a separate bug for the new problem. Thank you.
Seems to be fixed now, thanks!