With fio-2.12-3-g8a09 I've seen the occasional segfault while running
a job like this:
./fio --allow_file_create=0 --randseed=1 --rw=randread --direct=1
--iodepth=16 --ioengine=libaio --bs=64k --time_based=1 --runtime=12h
--random_distribution=zipf:0.8 --name=go --filename /dev/sde
Here's a backtrace:
Thread 1 (Thread 0x7f8518911740 (LWP 4078)):
#0 fio_libaio_getevents (td=0x7f850076fa80, min=15, max=15,
t=<optimized out>) at engines/libaio.c:161
#1 0x000000000041a493 in td_io_getevents (td=td@entry=0x7f850076fa80,
min=15, max=<optimized out>, t=0x0) at ioengines.c:241
#2 0x000000000043ead6 in io_u_queued_complete
(td=td@entry=0x7f850076fa80, min_evts=<optimized out>) at io_u.c:1958
#3 0x000000000045db9e in do_io (bytes_done=<synthetic pointer>,
td=0x7f850076fa80) at backend.c:1048
#4 thread_main (data=<optimized out>) at backend.c:1667
#5 0x000000000045f3f7 in fork_main (offset=1, shmid=<optimized out>,
sk_out=0x0) at backend.c:1830
#6 run_threads (sk_out=sk_out@entry=0x0) at backend.c:2248
#7 0x000000000045f76d in fio_backend (sk_out=sk_out@entry=0x0) at
backend.c:2381
#8 0x000000000040cf28 in main (argc=17, argv=0x7ffd99aef418,
envp=<optimized out>) at fio.c:63
Looking close to line 161 shows the following:
160 if (o->userspace_reap == 1
161 && actual_min == 0
162 && ((struct aio_ring *)(ld->aio_ctx))->magic
163 == AIO_RING_MAGIC) {
(gdb) p o
$1 = (struct libaio_options *) 0x0
(gdb) p actual_min
$2 = <optimized out>
(gdb) p ((struct aio_ring *)(ld->aio_ctx))->magic
Cannot access memory at address 0x7f8518903010
--
Sitsofe | http://sucs.org/~sits/
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