linux-ext4 - [Bug 45621] Kernel ooops: BUG: unable to handle kernel paging request at 000000080000001c

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Message-Id: <20121107095840.2D82111FB59@bugzilla.kernel.org>
Date:	Wed,  7 Nov 2012 09:58:40 +0000 (UTC)
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 45621] Kernel ooops: BUG: unable to handle kernel paging
 request at 000000080000001c

https://bugzilla.kernel.org/show_bug.cgi?id=45621

Ivan Shapovalov <intelfx100@...il.com> changed:

           What    |Removed                     |Added
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                 CC|                            |intelfx100@...il.com

--- Comment #7 from Ivan Shapovalov <intelfx100@...il.com>  2012-11-07 09:58:39 ---
This (or similar) seems to be reproducible with reiser4 (another out-of-tree
filesystem) on a custom kernel.

Symptoms:
1) on newly allocated pages, sometimes page_private(pg) != 0ul
2) sometimes BUGs happen on 0000_0000_0000_000e in a following scenario:
pg = find_or_create_page(...);
// check for pg != NULL
// pg->mapping is accessed

Happens 2-3 times a day. Also different BUGs happened (addresses 0016, 00b0,
0f91) but the backtraces seem to be invalid and I can't describe the actual
in-code scenario.

Directly observed on kernels 3.2 to latest stable (but current reiser4
maintainer, Edward Shishkin, seen this on 2.6.39 - though just 1-2 times at
all).

In my case, the kernel is vanilla + -ck patchset + various config changes (KSM,
big pagetables, cleancache+frontswap+zcache, sparse memory model, transparent
hugepages).
The config is here: ftp://intelfx.homeip.net/kernel_config
Hardware is Acer 3830TG (HM65 chipset, SNB cpu, 4 GB of RAM). Running in x86_64
mode.

I know that this is too small level of detail - but can anything be done to
track down/collect more info?

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