From: Matt Zimmerman <mdz@debian.org>
To: user-mode-linux-devel@lists.sourceforge.net
Subject: Re: [uml-devel] Host panic triggered by UML
Date: Thu, 20 Nov 2003 15:06:11 -0500 [thread overview]
Message-ID: <20031120200611.GK9377@dijkstra.csh.rit.edu> (raw)
In-Reply-To: <200311201915.29188.blaisorblade_spam@yahoo.it>
On Thu, Nov 20, 2003 at 07:15:29PM +0100, BlaisorBlade wrote:
> Nov 19 04:40:24 blaisorblade kernel: Unable to handle kernel NULL pointer
> dereference at virtual address 00000000
> Nov 19 04:40:24 blaisorblade kernel: printing eip:
> Nov 19 04:40:24 blaisorblade kernel: c015421b
> Nov 19 04:40:24 blaisorblade kernel: *pde = 00000000
> Nov 19 04:40:24 blaisorblade kernel: Oops: 0002
> Nov 19 04:40:24 blaisorblade kernel: CPU: 0
> Nov 19 04:40:24 blaisorblade kernel: EIP: 0010:[dcache_dir_lseek+299/384]
> Tainted: PF
> Nov 19 04:40:24 blaisorblade kernel: EIP: 0010:[<c015421b>] Tainted: PF
> Nov 19 04:40:24 blaisorblade kernel: EFLAGS: 00010286
> Nov 19 04:40:24 blaisorblade kernel: eax: 00000000 ebx: c0d24160 ecx:
> d6b15f08 edx: c0d24160
> Nov 19 04:40:24 blaisorblade kernel: esi: 00000002 edi: 00000000 ebp:
> c0d24140 esp: d67cbf84
> Nov 19 04:40:24 blaisorblade kernel: ds: 0018 es: 0018 ss: 0018
> Nov 19 04:40:24 blaisorblade kernel: Process linux (pid: 18847,
> stackpage=d67cb000)
> Nov 19 04:40:24 blaisorblade kernel: Stack: fffffff2 c0d24140 00000000
> 00000000 c01540f0 d2473f20 c01433f8 d2473f20
> Nov 19 04:40:24 blaisorblade kernel: 00000002 00000000 00000000
> d67ca000 4014b008 00000002 a2533abc c01075b7
> Nov 19 04:40:24 blaisorblade kernel: 0000002f 00000002 00000000
> 4014b008 00000002 a2533abc 00000013 0000002b
> Nov 19 04:40:24 blaisorblade kernel: Call Trace: [dcache_dir_lseek+0/384]
> [sys_lseek+120/192] [system_call+51/56]
> Nov 19 04:40:24 blaisorblade kernel: Call Trace: [<c01540f0>] [<c01433f8>]
> [<c01075b7>]
> Nov 19 04:40:24 blaisorblade kernel:
> Nov 19 04:40:24 blaisorblade kernel: Code: 89 10 89 42 04 b8 00 e0 ff ff 21 e0
> ff 48 04 8b 50 14 39 50
I've seen this same crash many times; I sent it to lkml but got no response.
> (I've had another oops in the same call path and point, so I guess this
> was the reason even the other time).
>
> This means that it crashes in fs/readdir.c:dcache_dir_lseek; after some
> checks So, probably the oops happened while working on that folder: what
> needs to be checked is if the tmpfs code creates an inconsistent
> list(exactly, an inconsistent struct dentry.d_subdirs one, since p walks
> into it). Do you think this is reasonable or not?
It only happened for me using UML hostfs on a tmpfs filesystem, so I believe
it is a tmpfs bug, yes.
--
- mdz
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prev parent reply other threads:[~2003-11-20 20:06 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-11-20 18:15 [uml-devel] Host panic triggered by UML BlaisorBlade
2003-11-20 18:56 ` Frank Dekervel
2003-11-20 19:37 ` [uml-devel] Host panic when UML reads host /dev/shm BlaisorBlade
2003-11-20 22:32 ` Frank Dekervel
2003-11-20 22:47 ` Frank Dekervel
2003-11-22 18:11 ` BlaisorBlade
2003-11-24 3:36 ` Frank Dekervel
2003-11-21 2:22 ` Jeff Dike
2003-11-22 18:12 ` BlaisorBlade
2003-11-20 20:06 ` Matt Zimmerman [this message]
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