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
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