From: Jens Axboe <axboe@kernel.dk>
To: Bruce Cran <bruce@cran.org.uk>, fio@vger.kernel.org
Subject: Re: fio newer than 2.2.12 segfaults on examples/tiobench-example.fio
Date: Wed, 20 Jan 2016 21:33:04 -0700 [thread overview]
Message-ID: <56A05F80.7070903@kernel.dk> (raw)
In-Reply-To: <56A05EDC.4030309@cran.org.uk>
On 01/20/2016 09:30 PM, Bruce Cran wrote:
> On 01/18/2016 02:57 PM, Jens Axboe wrote:
>> Can you compile with with --disable-optimizations passed to configure,
>> ensure that a core file is dumped (ulimit -c1000000000000 or
>> whatever), and then run gdb ./fio core to show a full backtrace?
>>
>> I can't reproduce the crash with 2.3 or current -git, runs fine for me.
>>
>
> I'm wondering if this is a microcode bug, since I have one of the new
> Skylake CPUs (Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz; stepping: 3;
> microcode: 0x6a) and others have mentioned crashes in
> __lll_unlock_elision related to broken CPUs/BIOSes, though for older
> generations.
> Anyway, here's the output and backtrace:
>
> (gdb) run examples/tiobench-example.fio
> Starting program: /home/bcran/workspace/fio/fio
> examples/tiobench-example.fio
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/lib64/libthread_db.so.1".
> f1: (g=0): rw=write, bs=4K-4K/4K-4K/4K-4K, ioengine=sync, iodepth=1
> ...
> f2: (g=1): rw=randwrite, bs=4K-4K/4K-4K/4K-4K, ioengine=sync, iodepth=1
> ...
> f3: (g=2): rw=read, bs=4K-4K/4K-4K/4K-4K, ioengine=sync, iodepth=1
> ...
> f4: (g=3): rw=randread, bs=4K-4K/4K-4K/4K-4K, ioengine=sync, iodepth=1
> ...
> fio-2.4-1-g44ac
> Starting 16 processes
> Detaching after fork from child process 26797.
> [New Thread 0x7fffe7d53700 (LWP 26796)]
>
> Program received signal SIGSEGV, Segmentation fault.
> __lll_unlock_elision (lock=0x7ffff7feb000, private=128) at
> ../sysdeps/unix/sysv/linux/x86/elision-unlock.c:29
> 29 ../sysdeps/unix/sysv/linux/x86/elision-unlock.c: No such file or
> directory.
> (gdb) bt
> #0 __lll_unlock_elision (lock=0x7ffff7feb000, private=128) at
> ../sysdeps/unix/sysv/linux/x86/elision-unlock.c:29
> #1 0x00000000004482fa in fio_mutex_down_timeout (mutex=0x7ffff7feb000,
> msecs=10000) at mutex.c:141
> #2 0x0000000000468dda in run_threads (sk_out=0x0) at backend.c:2183
> #3 0x0000000000469487 in fio_backend (sk_out=0x0) at backend.c:2381
> #4 0x0000000000486c42 in main (argc=2, argv=0x7fffffffdf18,
> envp=0x7fffffffdf30) at fio.c:63
Can you try and revert commit 09400a60042 and see if that fixes it?
--
Jens Axboe
next prev parent reply other threads:[~2016-01-21 4:33 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-17 14:03 fio newer than 2.2.12 segfaults on examples/tiobench-example.fio Bruce Cran
2016-01-18 21:57 ` Jens Axboe
2016-01-21 4:30 ` Bruce Cran
2016-01-21 4:33 ` Jens Axboe [this message]
2016-01-21 4:43 ` Bruce Cran
2016-01-21 4:51 ` Jens Axboe
2016-01-21 4:54 ` Jens Axboe
2016-01-21 4:38 ` Bruce Cran
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