From: Andrew Morton <akpm@osdl.org>
To: "Miquel van Smoorenburg" <miquels@cistron.nl>
Cc: linux-kernel@vger.kernel.org
Subject: Re: msync() oops in 2.6.7-rc2-bk1
Date: Fri, 4 Jun 2004 21:33:15 -0700 [thread overview]
Message-ID: <20040604213315.7060e7da.akpm@osdl.org> (raw)
In-Reply-To: <c9pvrd$v39$1@news.cistron.nl>
"Miquel van Smoorenburg" <miquels@cistron.nl> wrote:
>
> I'm running a news server. The innd process uses mmap()s for several
> files and uses msync() to force synchronization to disk every so
> often. Suddenly, an msync() causes an oops (and innd SEGVs). This
> is after the box has been up and running for 3 days:
>
> # uname -a
> Linux enterprise 2.6.7-rc2-bk1 #1 Mon May 31 15:03:52 CEST 2004 i686 GNU/Linux
>
> <1>Unable to handle kernel NULL pointer dereference at virtual address 00000000 printing eip:
> c0149120
> *pde = 00000000
> Oops: 0002 [#5]
> Modules linked in: e100 mii
> CPU: 0
> EIP: 0060:[<c0149120>] Not tainted
> EFLAGS: 00010213 (2.6.7-rc2-bk1)
> EIP is at __set_page_dirty_buffers+0x20/0xb0
> eax: 00000000 ebx: f77a1e7c ecx: c15706e0 edx: eba5a83c
> esi: 5ccfb000 edi: 00000000 ebp: 5d000000 esp: f44b5efc
> ds: 007b es: 007b ss: 0068
> Process innd (pid: 10936, threadinfo=f44b5000 task=d0eb2c70)
> Stack: f77a1de4 00000004 00000000 c4af23ec c013143e c15706e0 c013da1c 5ccfb000
> c4af23f0 c013db0f c4af23ec f7101900 5ccfb000 00000001 5cc00000 ce8b25d0
> 00000000 5d000000 c013dbc3 ce8b25cc 5cc00000 5d000000 f7101900 00000001
> Call Trace:
> [<c013143e>] set_page_dirty+0x3e/0x50
> [<c013da1c>] filemap_sync_pte+0x5c/0x80
> [<c013db0f>] filemap_sync_pte_range+0xcf/0xf0
> [<c013dbc3>] filemap_sync+0x93/0x100
> [<c013dc96>] msync_interval+0x66/0xf0
> [<c013de37>] sys_msync+0x117/0x123
> [<c0103c7b>] syscall_call+0x7/0xb
>
> Code: 0f ba 28 01 8b 40 08 39 d0 75 f5 0f ba 29 04 19 c0 85 c0 75
You have a page which has PG_private set, but page->private is NULL. And
the machine is non-SMP, non-preempt, yes?
I'd be wondering whether that machine has flipped a bit in page->flags,
frankly. How old is it?
Was the mmap of a regular file or of a block device?
next prev parent reply other threads:[~2004-06-05 4:34 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-04 14:09 Miquel van Smoorenburg
2004-06-05 4:33 ` Andrew Morton [this message]
2004-06-05 10:35 ` Miquel van Smoorenburg
2004-06-08 17:34 ` Bill Davidsen
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