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Re: backup transaction with io-thread core dumps


From: Dietmar Maurer
Subject: Re: backup transaction with io-thread core dumps
Date: Tue, 24 Mar 2020 14:30:17 +0100 (CET)

This is fixed with this patch:

https://lists.gnu.org/archive/html/qemu-devel/2020-03/msg07249.html

thanks!

> On March 24, 2020 12:13 PM Dietmar Maurer <address@hidden> wrote:
> 
>  
> 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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