linux-kernel - Re: [BUG] 2.6.26-rc5-mm3 kernel BUG at mm/filemap.c:575!

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Date:	Thu, 12 Jun 2008 01:57:46 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, kernel-testers@...r.kernel.org,
	linux-mm@...ck.org, Nick Piggin <npiggin@...e.de>,
	Andy Whitcroft <apw@...dowen.org>
Subject: Re: [BUG] 2.6.26-rc5-mm3 kernel BUG at mm/filemap.c:575!

On Thu, 12 Jun 2008 14:14:21 +0530 Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com> wrote:

> Hi Andrew,
> 
> 2.6.26-rc5-mm3 kernel panics while booting up on the x86_64
> machine. Sorry the console is bit overwritten for the first few lines.
> 
> ------------[ cut here ]------------
> ot fs
> no fstab.kernel BUG at mm/filemap.c:575!
> sys, mounting ininvalid opcode: 0000 [1] ternal defaultsSMP 
> Switching to ne
> w root and runnilast sysfs file: /sys/block/dm-3/removable
> ng init.
> unmounCPU 3 ting old /dev
> u
> nmounting old /pModules linked in:roc
> unmounting 
> old /sys
> Pid: 1, comm: init Not tainted 2.6.26-rc5-mm3-autotest #1
> RIP: 0010:[<ffffffff80268155>]  [<ffffffff80268155>] unlock_page+0xf/0x26
> RSP: 0018:ffff81003f9e1dc8  EFLAGS: 00010246
> RAX: 0000000000000000 RBX: ffffe20000f63080 RCX: 0000000000000036
> RDX: 0000000000000000 RSI: ffffe20000f63080 RDI: ffffe20000f63080
> RBP: 0000000000000000 R08: ffff81003f9a5727 R09: ffffc10000200200
> R10: ffffc10000100100 R11: 000000000000000e R12: 0000000000000000
> R13: 0000000000000000 R14: ffff81003f47aed8 R15: 0000000000000000
> FS:  000000000066d870(0063) GS:ffff81003f99fa80(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> CR2: 000000000065afa0 CR3: 000000003d580000 CR4: 00000000000006e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> Process init (pid: 1, threadinfo ffff81003f9e0000, task ffff81003f9d8000)
> Stack:  ffffe20000f63080 ffffffff80270d9c 0000000000000000 ffffffffffffffff
>  000000000000000e 0000000000000000 ffffe20000f63080 ffffe20000f630c0
>  ffffe20000f63100 ffffe20000f63140 ffffe20000f63180 ffffe20000f631c0
> Call Trace:
>  [<ffffffff80270d9c>] truncate_inode_pages_range+0xc5/0x305
>  [<ffffffff802a7177>] generic_delete_inode+0xc9/0x133
>  [<ffffffff8029e3cd>] do_unlinkat+0xf0/0x160
>  [<ffffffff8020bd0b>] system_call_after_swapgs+0x7b/0x80
> 
> 
> Code: 00 00 48 85 c0 74 0b 48 8b 40 10 48 85 c0 74 02 ff d0 e8 75 ec 32 00 41 5b 31 c0 c3 53 48 89 fb f0 0f ba 37 00 19 c0 85 c0 75 04 <0f> 0b eb fe e8 56 f5 ff ff 48 89 de 48 89 c7 31 d2 5b e9 47 be 
> RIP  [<ffffffff80268155>] unlock_page+0xf/0x26
>  RSP <ffff81003f9e1dc8>
> ---[ end trace 27b1d01b03af7c12 ]---

Another unlock of an unlocked page.  Presumably when reclaim hadn't
done anything yet. 

Don't know, sorry.  Strange.
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