From: Sebastian Roesner <sroesner-kernelorg@roesner-online.de>
To: Eric Wheeler <bcache@lists.ewheeler.net>
Cc: linux-bcache@vger.kernel.org
Subject: Re: Bug - bcache: "unable to handle kernel NULL pointer dereference" when trying to add a md caching device
Date: Fri, 25 Mar 2016 15:11:30 +0100 [thread overview]
Message-ID: <56F54712.6090202@roesner-online.de> (raw)
In-Reply-To: <alpine.LRH.2.11.1603250416030.13440@mail.ewheeler.net>
Hi Eric,
Am 25.03.2016 um 05:18 schrieb Eric Wheeler:
> Please send this output:
>
> tail /sys/block/md2/queue/discard_*
>> git pull https://bitbucket.org/ewheelerinc/linux v4.5-rc6-bcache-fixes
>> git pull https://bitbucket.org/ewheelerinc/linux v4.5-rc7-bcache-fixes
>
> Try this patch and see if it BUGs:
> [..]
# tail /sys/block/md2/queue/discard_*
==> /sys/block/md2/queue/discard_granularity <==
4096
==> /sys/block/md2/queue/discard_max_bytes <==
2147450880
==> /sys/block/md2/queue/discard_max_hw_bytes <==
2147450880
==> /sys/block/md2/queue/discard_zeroes_data <==
0
root@gropius:/home/sroesner# echo /dev/md2 > /sys/fs/bcache/register
sroesner@gropius:~$
-> it killed my bash.
Trace with patches and BUG_ON patch:
[ 172.660142] BUG: unable to handle kernel NULL pointer dereference at
0000000000000028
[ 172.660229] IP: [<ffffffff811e53b4>] bio_trim+0xf/0x2a
[ 172.660289] PGD 7faf3e067 PUD 7f9279067 PMD 0
[ 172.660399] Oops: 0000 [#1] SMP
[...]
[ 172.664780] Call Trace:
[ 172.664813] [<ffffffffa007f3be>] ? raid1_make_request+0x2e8/0xad7
[raid1]
[ 172.664846] [<ffffffff811f07da>] ? blk_queue_split+0x377/0x3d4
[ 172.664880] [<ffffffffa005fb5f>] ? md_make_request+0xf6/0x1e9 [md_mod]
[ 172.664912] [<ffffffff811eb860>] ? generic_make_request+0xb5/0x155
[ 172.664947] [<ffffffffa0445c89>] ? prio_io+0x85/0x95 [bcache]
[ 172.664981] [<ffffffffa0448252>] ? register_cache_set+0x355/0x8d0
[bcache]
[ 172.665016] [<ffffffffa04497d3>] ? register_bcache+0x1006/0x1174
[bcache]
See http://pastebin.com/6CHtky2x for complete traces.
Sebastian
next prev parent reply other threads:[~2016-03-25 14:11 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-24 15:19 Bug - bcache: "unable to handle kernel NULL pointer dereference" when trying to add a md caching device Sebastian Roesner
2016-03-25 1:49 ` Eric Wheeler
2016-03-25 4:18 ` Eric Wheeler
2016-03-25 14:11 ` Sebastian Roesner [this message]
2016-03-25 20:44 ` [BUG] NULL pointer in raid1_make_request passed to bio_trim when adding md as bcache caching dev Eric Wheeler
2016-03-25 21:32 ` Eric Wheeler
2016-03-26 18:38 ` Sebastian Roesner
2016-03-26 15:40 ` Ming Lei
2016-03-26 16:46 ` Sebastian Roesner
2016-03-28 18:10 ` Shaohua Li
2016-03-28 18:38 ` Jeff Moyer
2016-03-29 1:28 ` Ming Lei
2016-04-01 18:14 ` Eric Wheeler
2016-04-10 18:01 ` Sebastian Roesner
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