From: Jens Axboe <axboe@kernel.dk>
To: Han Pingtian <hanpt@linux.vnet.ibm.com>
Cc: Erwan Velu <erwan@enovance.com>, fio@vger.kernel.org
Subject: Re: segmentation fault on power system
Date: Fri, 09 Aug 2013 09:02:59 -0600 [thread overview]
Message-ID: <520504A3.7070505@kernel.dk> (raw)
In-Reply-To: <20130809083905.GA9877@localhost.localdomain>
On 08/09/2013 02:39 AM, Han Pingtian wrote:
> On Thu, Jul 25, 2013 at 08:34:41AM -0600, Jens Axboe wrote:
>> On 07/24/2013 12:21 AM, Han Pingtian wrote:
>>> I think I have found what's wrong. After 'make distclean' then 'make',
>>> the problem of segfault has gone. There were some object files
>>> compiled on another machine. The recompilation fixed it. But looks like
>>> the ATBU call dosen't work on power7 system.
>>
>> So the recompilation fixed the segfault, but not the illegal instruction
>> due to ATBU?
>
> Yes. If we set unlimit core dump, fio will generate a core with
> backtrace like this one:
>
> #0 mfspr (envp=<value optimized out>) at arch/arch-ppc.h:55
> 55 asm volatile("mfspr %0,%1": "=r" (val) : "K" (reg));
> Missing separate debuginfos, use: debuginfo-install glibc-2.12-1.107.el6.ppc64 libaio-0.3.107-10.el6.ppc64
> (gdb) bt
> #0 mfspr (envp=<value optimized out>) at arch/arch-ppc.h:55
> #1 get_cpu_clock (envp=<value optimized out>) at arch/arch-ppc.h:71
> #2 atb_child (envp=<value optimized out>) at arch/arch-ppc.h:88
> #3 atb_clocktest (envp=<value optimized out>) at arch/arch-ppc.h:98
> #4 arch_init (envp=<value optimized out>) at arch/arch-ppc.h:116
> #5 initialize_fio (envp=<value optimized out>) at libfio.c:248
> #6 0x0000000010067294 in main (argc=<value optimized out>, argv=<value optimized out>,
> envp=<value optimized out>) at fio.c:33
>
>
> Apologize for late to reply.
Alright, I'll have PPC default to the normal clock until we can improve
and detect this properly.
--
Jens Axboe
next prev parent reply other threads:[~2013-08-09 15:03 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-23 10:13 segmentation fault on power system Han Pingtian
2013-07-23 10:23 ` Erwan Velu
2013-07-23 15:15 ` Jens Axboe
2013-07-24 2:10 ` Han Pingtian
2013-07-24 6:21 ` Han Pingtian
2013-07-25 14:34 ` Jens Axboe
2013-08-09 8:39 ` Han Pingtian
2013-08-09 15:02 ` Jens Axboe [this message]
2013-07-24 1:40 ` Han Pingtian
-- strict thread matches above, loose matches on Subject: below --
2013-10-10 6:30 Saritha Vinod
2013-10-11 16:28 ` Jens Axboe
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