linux-kernel - Re: 2.6.26-rc5-mm1

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Date:	Mon, 9 Jun 2008 22:01:49 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mariusz Kozlowski <m.kozlowski@...land.pl>
Cc:	balbir@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	Peter Oberparleiter <peter.oberparleiter@...ibm.com>
Subject: Re: 2.6.26-rc5-mm1

On Tue, 10 Jun 2008 06:57:02 +0200 Mariusz Kozlowski <m.kozlowski@...land.pl> wrote:

> Witam, 
> 
> > On Mon, 9 Jun 2008 21:14:54 +0200
> > Mariusz Kozlowski <m.kozlowski@...land.pl> wrote:
> > 
> > > Hello Balbir,
> > > 
> > > > Andrew Morton wrote:
> > > > > Temporarily at
> > > > > 
> > > > >   http://userweb.kernel.org/~akpm/2.6.26-rc5-mm1/
> > > > > 
> > > > 
> > > > I've hit a segfault, the last few lines on my console are
> > > > 
> > > > 
> > > > Testing -fstack-protector-all feature
> > > > registered taskstats version 1
> > > > debug: unmapping init memory ffffffff80c03000..ffffffff80dd8000
> > > > init[1]: segfault at 7fff701fe880 ip 7fff701fee5e sp 7fff7006e6d0 error 7
> > > > 
> > > > With absolutely no stack trace. I'll dig deeper.
> > > 
> > > Hey, I see something similar and I actually have a stack trace. Here it goes:
> > > 
> > > bash[498] segfault at ffffffff80868b58 ip ffffffffff600412 sp 7fffa3d010f0 error 7
> > > init[1] segfault at ffffffff80868b58 ip ffffffffff600412 sp 7fff9e97f640 error 7
> > > init[1] segfault at ffffffff80868b58 ip ffffffffff600412 sp 7fff9e97eed0 error 7
> > > Kernel panic - not syncing: Attemted to kill init!
> > > Pid 1, comm: init Not tainted 2.6.26-rc5-mm1 #1
> > > 
> > > Call Trace:
> > > [<ffffffff80254632>] panic+0xe2/0x260
> > > [<ffffffff802fa8ba>] ? __slab_free+0x10a/0x630
> > > [<ffffffff80265a8e>] ? __sigqueue_free+0x5e/0x70
> > > [<ffffffff802851eb>] ? trace_hardirqs_off+0x1b/0x30
> > > [<ffffffff802851eb>] ? trace_hardirqs_off+0x1b/0x30
> > > [<ffffffff80259b54>] do_exit+0xb84/0xc30
> > > [<ffffffff80259c5a>] do_group_exit+0x5a/0x110
> > > [<ffffffff8026a3b5>] get_signal_to_deliver+0x2c5/0x620
> > > [<ffffffff8020bb3b>] do_notify_resume+0x11b/0xd10
> > > [<ffffffff8028da5b>] ? trace_hardirqs_on+0x1b/0x30
> > > [<ffffffff805cd0f3>] ? _spin_unlock_irqrestore+0x93/0x130
> > > [<ffffffff8026865c>] ? force_sig_info+0x10c/0x130
> > > [<ffffffff8022fb9c>] ? force_sig_info_fault+0x2c/0x40
> > > [<ffffffff802dd7dd>] ? print_vma_addr+0x10d/0x1d0
> > > [<ffffffff805cbb67>] ? trace_hardirqs_on_thunk+0x3a/0x3f
> > > [<ffffffff8028d8da>] ? trace_hardirqs_on_caller+0x15a/0x2c0
> > > [<ffffffff8020d4c9>] retint_signal+0x46/0x8d
> > > 
> > > This was copied manually so typos are possible.
> > > 
> > 
> > Thanks.  Could someone send a config please?  Or a bisection result ;)
> 
> In my case it turns out to be gcov patches - in which I'm interested
> in to see (and play with) the tests coverage.
> 
> #
> # gcov
> #
> kernel-call-constructors.patch
> kernel-introduce-gcc_version_lower-macro.patch
> seq_file-add-function-to-write-binary-data.patch
> GOOD
> gcov-add-gcov-profiling-infrastructure.patch
> GOOD
> gcov-create-links-to-gcda-files-in-build-directory.patch
> gcov-architecture-specific-compile-flag-adjustments.patch
> BAD
> 
> I can not bisect between the last two due to build error. Config is attached.
> 

(cc Peter)
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