From: Neil Brown <neilb@suse.de>
To: Jiri Slaby <jirislaby@gmail.com>
Cc: James Bottomley <James.Bottomley@suse.de>,
linux-kernel@vger.kernel.org, akpm@linux-foundation.org,
mm-commits@vger.kernel.org, linux-scsi@vger.kernel.org,
Jens Axboe <Jens.Axboe@oracle.com>
Subject: Re: BUG at scsi_lib.c:1108 [Was: mmotm 2009-11-24-16-47 uploaded]
Date: Thu, 26 Nov 2009 08:13:59 +1100 [thread overview]
Message-ID: <20091126081359.414c8216@notabene.brown> (raw)
In-Reply-To: <4B0D9221.2050103@gmail.com>
On Wed, 25 Nov 2009 21:22:57 +0100
Jiri Slaby <jirislaby@gmail.com> wrote:
> It doesn't make sense at all. How can empty merge cause a regression?
> And md/for-next doesn't produce the BUG.
I've hit that situation before. Two separate changes in separate
branches conspire to cause a problem.
md/for-next contains code to handle barriers properly for all levels,
not just RAID1.
It is possible I got this wrong in some way, and some new sanity check
in a separate branch is firing, or it is possible some other bug in
barrier handling has been added and now that MD sends barriers, it is
being triggered.
What I did to find the actual offending patches is to got to one of the
heads just before the merge, and cherry-pick all the patches from the
other branch, and then bisect that.
NeilBrown
next prev parent reply other threads:[~2009-11-25 22:45 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-25 0:47 mmotm 2009-11-24-16-47 uploaded akpm
2009-11-25 15:12 ` BUG at scsi_lib.c:1108 [Was: mmotm 2009-11-24-16-47 uploaded] Jiri Slaby
2009-11-25 15:19 ` James Bottomley
2009-11-25 20:22 ` Jiri Slaby
2009-11-25 21:13 ` Neil Brown [this message]
2009-11-26 10:17 ` Boaz Harrosh
2009-11-27 4:17 ` Neil Brown
2009-11-27 10:20 ` Jiri Slaby
2009-11-26 1:46 ` mmotm 2009-11-24-16-47 uploaded (gpio_max7301) Randy Dunlap
2009-11-28 16:21 ` Wolfram Sang
2009-12-15 22:43 ` Andrew Morton
2009-12-15 22:46 ` Randy Dunlap
2009-12-15 23:10 ` Andrew Morton
2009-12-16 11:30 ` Wolfram Sang
2009-11-27 10:33 ` ugly sound output (intel-hda) [was: mmotm 2009-11-24-16-47 uploaded] Jiri Slaby
2009-11-27 10:45 ` Takashi Iwai
2009-11-27 11:07 ` Jiri Slaby
2009-11-27 11:18 ` Takashi Iwai
2009-11-27 12:22 ` Jiri Slaby
2009-11-27 12:26 ` Takashi Iwai
2009-11-27 15:03 ` WARNING: kernel/smp.c:292 smp_call_function_single [Was: " Jiri Slaby
2009-11-27 15:17 ` Peter Zijlstra
2009-11-27 16:37 ` Thomas Gleixner
2009-11-27 16:44 ` Thomas Gleixner
2009-11-28 12:12 ` Avi Kivity
2009-11-30 8:58 ` Tejun Heo
2009-11-30 9:41 ` Avi Kivity
2009-11-30 10:02 ` Thomas Gleixner
2009-11-30 10:45 ` Tejun Heo
2009-11-30 11:02 ` [PATCH tip/sched/urgent] sched: revert 498657a478c60be092208422fefa9c7b248729c2 Tejun Heo
2009-11-30 11:13 ` Avi Kivity
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