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Subject: Re: [2.6.30-rc1] gpf in btrfs during shutdown
From: Chris Mason <chris.mason@oracle.com>
To: Ed Tomlinson <edt@aei.ca>
Cc: linux-kernel <linux-kernel@vger.kernel.org>
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	 <200904081948.02742.edt@aei.ca>
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Date: Wed, 08 Apr 2009 20:14:54 -0400
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On Wed, 2009-04-08 at 19:48 -0400, Ed Tomlinson wrote:

> 
> Chris,
> 
> Just go the following gpf during shutdown runing 2.6.30-rc1 on amd64 on a kernel built with gcc 4.3.3
> 
> * Unmounting filesystems ...[75813.573941] EXT4-fs: mballoc: 313285 blocks 3098 reqs (2001 success)
> [75813.593628] EXT4-fs: mballoc: 1312 extents scanned, 438 goal hits, 1063 2^N hits, 0 breaks, 0 lost
> [75813.621386] EXT4-fs: mballoc: 1551 generated and it took 21437865
> [75813.640246] EXT4-fs: mballoc: 364104 preallocated, 204441 discarded
> [75813.685443] general protection fault: 0000 [#1] PREEMPT SMP
> [75813.698277] last sysfs file: /sys/devices/pci0000:00/0000:00:01.0/0000:01:05.0/enable
> [75813.698277] CPU 1
> [75813.698277] Modules linked in: btrfs/etc/init.d/halt zlib_deflate zlib_inflate crc32c libcrc32c radeon drm bridge stp llc bnep rf]
> .sh: line 90:  6[75813.698277] Pid: 6768, comm: umount Not tainted 2.6.30-rc1-crc #1 System Product Name
> 768 Segmentation[75813.698277] RIP: 0010:[<ffffffff8030e3a7>]  [<ffffffff8030e3a7>] kmem_cache_alloc+0x77/0x210
>  fault      umou[75813.698277] RSP: 0018:ffff8801466514a8  EFLAGS: 00010046
> nt "${x}" >&/dev[75813.698277] RAX: 0000000000000000 RBX: ffff880028066b40 RCX: ffff88015f3444a0
> /null

That's not supposed to happen.  Do you have slab (or slub) debug
enabled? 

-chris

> [75813.698277] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff80847330
> [75813.698277] RBP: ffff8801466514e8 R08: 00000035c2309000 R09: 0000000000000002
> [75813.698277] R10: 0000000000001000 R11: 0000000000000001 R12: ff880153891480ff
> [75813.698277] R13: 0000000000000246 R14: ffffffff8088ca58 R15: 0000000000000080
> [75813.698277] FS:  00007f6dd9cc0740(0000) GS:ffff880028059000(0000) knlGS:0000000000000000
> [75813.698277] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> [75813.698277] CR2: 00007f6dd964e000 CR3: 00000001425fd000 CR4: 00000000000006e0
> [75813.698277] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [75813.698277] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> [75813.698277] Process umount (pid: 6768, threadinfo ffff880146650000, task ffff88015f3444a0)
> [75813.698277] Stack:
> [75813.698277]  0000005000e7f0b0 0000000000e7f0b0 0000000000e7f0b0 0000000000000000
> [75813.698277]  0000000000000060 0000000000000051 ffff88013cd073c0 ffff88013cd078a0
> [75813.698277]  ffff8801466515a8 ffffffffa04e1365 000000000000be2d 0000000000000000
> [75813.698277] Call Trace:
> [75813.698277]  [<ffffffffa04e1365>] btrfs_update_delayed_ref+0x245/0x490 [btrfs]
> [75813.698277]  [<ffffffff8043a8e0>] ? sort+0x160/0x250
> [75813.698277]  [<ffffffffa048befc>] __btrfs_update_extent_ref+0x6c/0xb0 [btrfs]
> [75813.698277]  [<ffffffff80610f94>] ? _cond_resched+0x44/0xa0
> [75813.698277]  [<ffffffffa0491ab3>] btrfs_inc_ref+0x6c3/0x7d0 [btrfs][75813.698277]  [<ffffffffa048e7bc>] ? btrfs_init_new_buffer+0x11c/0x180 [btrfs]
> [75813.698277]  [<ffffffffa04c7b84>] ? write_extent_buffer+0x114/0x330 [btrfs]
> [75813.698277]  [<ffffffffa048be90>] ? __btrfs_update_extent_ref+0x0/0xb0 [btrfs]
> [75813.698277]  [<ffffffff80618129>] ? sub_preempt_count+0x69/0x70
> [75813.698277]  [<ffffffffa04815fa>] __btrfs_cow_block+0x58a/0xbc0 [btrfs]
> [75813.698277]  [<ffffffffa0481d39>] btrfs_cow_block+0x109/0x270 [btrfs]
> [75813.698277]  [<ffffffffa04877f2>] btrfs_search_slot+0x202/0x880 [btrfs]
> [75813.698277]  [<ffffffffa048a458>] lookup_extent_backref+0x68/0x160 [btrfs]
> [75813.698277]  [<ffffffff80618129>] ? sub_preempt_count+0x69/0x70
> [75813.698277]  [<ffffffffa048c91d>] __btrfs_free_extent+0x18d/0x950 [btrfs]
> [75813.698277]  [<ffffffff80618129>] ? sub_preempt_count+0x69/0x70
> [75813.698277]  [<ffffffff80618191>] ? add_preempt_count+0x61/0x70
> [75813.698277]  [<ffffffffa048d35d>] run_one_delayed_ref+0x27d/0x2c0 [btrfs]
> [75813.698277]  [<ffffffffa048e8f6>] run_clustered_refs+0xd6/0x250 [btrfs]
> [75813.698277]  [<ffffffffa048eb46>] btrfs_run_delayed_refs+0xd6/0x2b0 [btrfs]
> [75813.698277]  [<ffffffffa04a4244>] btrfs_commit_tree_roots+0xb4/0x2f0 [btrfs]
> [75813.698277]  [<ffffffffa04a4e0b>] btrfs_commit_transaction+0x5cb/0xa00 [btrfs]
> [75813.698277]  [<ffffffff802724d0>] ? autoremove_wake_function+0x0/0x70
> [75813.698277]  [<ffffffffa04a3315>] ? start_transaction+0x125/0x170 [btrfs]
> [75813.698277]  [<ffffffffa047cd66>] btrfs_sync_fs+0x66/0xb0 [btrfs]
> [75813.698277]  [<ffffffff803177a6>] __fsync_super+0x66/0xa0
> [75813.698277]  [<ffffffff80317805>] fsync_super+0x25/0x50
> [75813.698277]  [<ffffffff80317a7e>] generic_shutdown_super+0x3e/0x170
> [75813.698277]  [<ffffffff80317c55>] kill_anon_super+0x25/0x70
> [75813.698277]  [<ffffffff80318189>] deactivate_super+0x69/0xa0
> [75813.698277]  [<ffffffff8033502c>] mntput_no_expire+0x1ac/0x1e0
> [75813.698277]  [<ffffffff80335466>] sys_umount+0x76/0x3e0
> [75813.698277]  [<ffffffff8020bf9b>] system_call_fastpath+0x16/0x1b
> [75813.698277] Code: 8b 9c c6 e8 00 00 00 48 83 3b 00 44 8b 7b 18 0f 84 77 01 00 00 31 d2 31 f6 48 c7 c7 30 73 84 80 e8 ff 2d fb ff
> [75813.698277] RIP  [<ffffffff8030e3a7>] kmem_cache_alloc+0x77/0x210
> [75813.698277]  RSP <ffff8801466514a8>
> [75813.698277] ---[ end trace a92f79fb0023c3c1 ]---
> 
> Followed by many more...
> 
> Hope this helps,
> Ed Tomlinson
> 
> 

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