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From: Helge Deller <deller@gmx.de>
To: Rolf Eike Beer <eike@sf-mail.de>
Cc: John David Anglin <dave.anglin@bell.net>,
	Ming Lei <tom.leiming@gmail.com>,
	James Bottomley <James.Bottomley@hansenpartnership.com>,
	linux-block@vger.kernel.org,
	Linux SCSI List <linux-scsi@vger.kernel.org>,
	linux-parisc List <linux-parisc@vger.kernel.org>,
	Kent Overstreet <kent.overstreet@gmail.com>
Subject: Re: [BUG] "block: make generic_make_request handle arbitrarily sized bios" breaks boot on parisc-linux
Date: Sun, 20 Mar 2016 19:12:44 +0100	[thread overview]
Message-ID: <56EEE81C.4080302@gmx.de> (raw)
In-Reply-To: <4070811.QJ02MzEnrO@caliban.sf-tec.de>

Hi Eike,

On 10.03.2016 08:04, Rolf Eike Beer wrote:
>> Right.
>> I just succeeded in reproducing the bug with moving blk_bio_segment_split()
>> into an own file (and with "extern" instead of "static" in blk-merge.c).
>> When compiled with -O2 it still crashes. So, next step is to analyze what
>> gcc does wrong when compiling this function. It should get easier now to
>> find the reason, since we have a smaller reproducer now.
> 
> I have a ton of compilers here on my C8000 and a few even on my C3600 which 
> drive nightly CMake dashboards. Could you send the testcase so I can pass it 
> through the list and see what breaks?

Thanks for the offer!
Sadly it's not a stand-alone testcase, just the original source code extracted
which can be manually compiled and then the generated assembly can be compared
to what it should be.
That said, I think this specific testcase is not really usable in your test environment.

By the way, the bug was just fixed. Details are in bugzilla:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70188

Thanks,
Helge

      reply	other threads:[~2016-03-20 18:12 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-02-24  2:28 [BUG] "block: make generic_make_request handle arbitrarily sized bios" breaks boot on parisc-linux John David Anglin
2016-02-24  7:59 ` Ming Lei
2016-02-24 21:36   ` Helge Deller
2016-02-24 23:28     ` John David Anglin
2016-02-25  3:38       ` Ming Lei
2016-02-25 10:10         ` Aw: " Helge Deller
2016-03-09 12:55         ` James Bottomley
2016-03-09 14:43           ` Ming Lei
2016-03-09 15:15             ` John David Anglin
2016-03-09 15:51               ` Ming Lei
2016-03-09 21:20               ` Helge Deller
2016-03-10  0:16                 ` James Bottomley
2016-03-10  7:04                 ` Rolf Eike Beer
2016-03-20 18:12                   ` Helge Deller [this message]

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