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backup transaction with io-thread core dumps


From: Dietmar Maurer
Subject: backup transaction with io-thread core dumps
Date: Tue, 24 Mar 2020 12:13:28 +0100 (CET)

I get a core dump with backup transactions when using io-threads.

To reproduce, create and start a VM with:

# qemu-img create disk1.raw 100M
# qemu-img create disk2.raw 100M
#./x86_64-softmmu/qemu-system-x86_64 -chardev 
'socket,id=qmp,path=/var/run/qemu-test.qmp,server,nowait' -mon 
'chardev=qmp,mode=control' -pidfile /var/run/qemu-server/108.pid  -m 512 
-object 'iothread,id=iothread-virtioscsi0' -object 
'iothread,id=iothread-virtioscsi1'  -device 
'virtio-scsi-pci,id=virtioscsi0,iothread=iothread-virtioscsi0' -drive 
'file=disk1.raw,if=none,id=drive-scsi0,format=raw,cache=none,aio=native,detect-zeroes=on'
 -device 
'scsi-hd,bus=virtioscsi0.0,channel=0,scsi-id=0,lun=0,drive=drive-scsi0,id=scsi0'
 -device 'virtio-scsi-pci,id=virtioscsi1,iothread=iothread-virtioscsi1' -drive 
'file=disk2.raw,if=none,id=drive-scsi1,format=raw,cache=none,aio=native,detect-zeroes=on'
 -device 
'scsi-hd,bus=virtioscsi1.0,channel=0,scsi-id=0,lun=1,drive=drive-scsi1,id=scsi1'

Then open socat to the qmp socket
# socat /var/run/qemu-test.qmp -

And run the following qmp command:

{ "execute": "qmp_capabilities", "arguments": {} }
{ "execute": "transaction", "arguments":  { "actions": [{ "type": 
"drive-backup", "data": { "device": "drive-scsi0", "sync": "full", "target": 
"backup-sysi0.raw" }}, { "type": "drive-backup", "data": { "device": 
"drive-scsi1", "sync": "full", "target": "backup-scsi1.raw" }}], "properties": 
{ "completion-mode": "grouped" } } }

The VM will core dump:

qemu: qemu_mutex_unlock_impl: Operation not permitted
Aborted (core dumped)
(gdb) bt
#0  0x00007f099d5037bb in __GI_raise (sig=sig@entry=6) at 
../sysdeps/unix/sysv/linux/raise.c:50
#1  0x00007f099d4ee535 in __GI_abort () at abort.c:79
#2  0x000055c04e39525e in error_exit (err=<optimized out>, 
msg=msg@entry=0x55c04e5122e0 <__func__.16544> "qemu_mutex_unlock_impl") at 
util/qemu-thread-posix.c:36
#3  0x000055c04e395813 in qemu_mutex_unlock_impl 
(mutex=mutex@entry=0x7f09903154e0, file=file@entry=0x55c04e51129f 
"util/async.c", line=line@entry=601)
    at util/qemu-thread-posix.c:108
#4  0x000055c04e38f8e5 in aio_context_release (ctx=ctx@entry=0x7f0990315480) at 
util/async.c:601
#5  0x000055c04e299073 in bdrv_set_aio_context_ignore (bs=0x7f0929a76500, 
new_context=new_context@entry=0x7f0990315000, 
ignore=ignore@entry=0x7ffe08fa7400)
    at block.c:6238
#6  0x000055c04e2990cc in bdrv_set_aio_context_ignore 
(bs=bs@entry=0x7f092af47900, new_context=new_context@entry=0x7f0990315000, 
ignore=ignore@entry=0x7ffe08fa7400)
    at block.c:6211
#7  0x000055c04e299443 in bdrv_child_try_set_aio_context 
(bs=bs@entry=0x7f092af47900, ctx=0x7f0990315000, 
ignore_child=ignore_child@entry=0x0, errp=errp@entry=0x0)
    at block.c:6324
#8  0x000055c04e299576 in bdrv_try_set_aio_context (errp=0x0, ctx=<optimized 
out>, bs=0x7f092af47900) at block.c:6333
#9  0x000055c04e299576 in bdrv_replace_child (child=child@entry=0x7f09902ef5e0, 
new_bs=new_bs@entry=0x0) at block.c:2551
#10 0x000055c04e2995ff in bdrv_detach_child (child=0x7f09902ef5e0) at 
block.c:2666
#11 0x000055c04e299ec9 in bdrv_root_unref_child (child=<optimized out>) at 
block.c:2677
#12 0x000055c04e29f3fe in block_job_remove_all_bdrv 
(job=job@entry=0x7f0927c18800) at blockjob.c:191
#13 0x000055c04e29f429 in block_job_free (job=0x7f0927c18800) at blockjob.c:88
#14 0x000055c04e2a0909 in job_unref (job=0x7f0927c18800) at job.c:359
#15 0x000055c04e2a0909 in job_unref (job=0x7f0927c18800) at job.c:351
#16 0x000055c04e2a0b68 in job_conclude (job=0x7f0927c18800) at job.c:620
#17 0x000055c04e2a0b68 in job_finalize_single (job=0x7f0927c18800) at job.c:688
#18 0x000055c04e2a0b68 in job_finalize_single (job=0x7f0927c18800) at job.c:660
#19 0x000055c04e2a14fc in job_txn_apply (txn=<optimized out>, fn=0x55c04e2a0a50 
<job_finalize_single>) at job.c:145
#20 0x000055c04e2a14fc in job_do_finalize (job=0x7f0927c1c200) at job.c:781
#21 0x000055c04e2a1751 in job_completed_txn_success (job=0x7f0927c1c200) at 
job.c:831
#22 0x000055c04e2a1751 in job_completed (job=0x7f0927c1c200) at job.c:844
#23 0x000055c04e2a1751 in job_completed (job=0x7f0927c1c200) at job.c:835
#24 0x000055c04e2a17b0 in job_exit (opaque=0x7f0927c1c200) at job.c:863
#25 0x000055c04e38ee75 in aio_bh_call (bh=0x7f098ec52000) at util/async.c:164
#26 0x000055c04e38ee75 in aio_bh_poll (ctx=ctx@entry=0x7f0990315000) at 
util/async.c:164
#27 0x000055c04e3924fe in aio_dispatch (ctx=0x7f0990315000) at 
util/aio-posix.c:380
#28 0x000055c04e38ed5e in aio_ctx_dispatch (source=<optimized out>, 
callback=<optimized out>, user_data=<optimized out>) at util/async.c:298
#29 0x00007f099f020f2e in g_main_context_dispatch () at 
/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#30 0x000055c04e391768 in glib_pollfds_poll () at util/main-loop.c:219
#31 0x000055c04e391768 in os_host_main_loop_wait (timeout=<optimized out>) at 
util/main-loop.c:242
#32 0x000055c04e391768 in main_loop_wait (nonblocking=nonblocking@entry=0) at 
util/main-loop.c:518
#33 0x000055c04e032329 in qemu_main_loop () at 
/home/dietmar/pve5-devel/mirror_qemu/softmmu/vl.c:1665
#34 0x000055c04df36a8e in main (argc=<optimized out>, argv=<optimized out>, 
envp=<optimized out>) at /home/dietmar/pve5-devel/mirror_qemu/softmmu/main.c:49




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