* [Qemu-devel] [Bug 1839428] Re: qemu core dumped when repeat "system_reset" multiple times during guest boot
2019-08-08 7:02 [Qemu-devel] [Bug 1839428] [NEW] qemu core dumped when repeat "system_reset" multiple times during guest boot Xujun Ma
@ 2019-08-08 7:26 ` Xujun Ma
2019-08-15 20:34 ` Philippe Mathieu-Daudé
` (4 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: Xujun Ma @ 2019-08-08 7:26 UTC (permalink / raw)
To: qemu-devel
Upstream qemu-v3.1.0 pass
Upstream qemu-v3.1.1 pass
Upstream qemu-v4.0.0 fail
Upstream qemu-v4.0.0-rc0 fail
So the problem occurs due to patch between qemu-v3.1.1 to
qemu-v4.0.0-rc0.
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https://bugs.launchpad.net/bugs/1839428
Title:
qemu core dumped when repeat "system_reset" multiple times during
guest boot
Status in QEMU:
New
Bug description:
commit 864ab314f1d924129d06ac7b571f105a2b76a4b2 (HEAD, tag: v4.1.0-rc4, origin/master, origin/HEAD, master)
Test arch:x86 and power
Steps:
1.Boot up guest with command
power cmdline:
/usr/libexec/backup/qemu-kvm \
-smp 8 \
-m 4096 \
-nodefaults \
-device virtio-blk-pci,id=image1,drive=drive_image1,bootindex=1,bus=pci.0,addr=0x7 \
-drive file=rhel77-ppc64le-virtio.qcow2,if=none,id=drive_image1,format=qcow2,cache=none \
-chardev stdio,mux=on,id=serial_id_serial0,server,nowait,signal=off \
-device spapr-vty,id=serial111,chardev=serial_id_serial0 \
-mon chardev=serial_id_serial0,mode=readline \
x86 cmdline:
/usr/libexec/qemu-kvm \
-m 4096 -smp 8 \
-boot menu=on \
-device virtio-blk-pci,id=image1,drive=drive_image1\
-drive file=rhel77-64-virtio.qcow2,if=none,id=drive_image1,format=qcow2,cache=none \
-vga std \
-vnc :9 \
-nographic \
-device virtio-net-pci,netdev=net0,id=nic0,mac=52:54:00:c4:e7:84 \
-netdev tap,id=net0,script=/etc/qemu-ifup,downscript=/etc/qemu-ifdown,vhost=on \
2.when guest start to boot up kernel(when no output infomation),run
hmp command "system_reset"
Result:
Sometimes,qemu core dumped with error as following:
system_reset
(qemu) qemu-system-ppc64: /root/qemu/hw/virtio/virtio.c:225: vring_get_region_caches: Assertion `caches != NULL' failed.
b.sh: line 11: 73679 Aborted (core dumped) /usr/local/bin/qemu-system-ppc64 -enable-kvm -smp 8 -m 4096 -nodefaults -device virtio-blk-pci,id=image1,drive=drive_image1,bootindex=1,bus=pci.0,addr=0x7 -drive file=rhel77-ppc64le-virtio.qcow2,if=none,id=drive_image1,format=qcow2,cache=none -chardev stdio,mux=on,id=serial_id_serial0,server,nowait,signal=off -device spapr-vty,id=serial111,chardev=serial_id_serial0 -mon chardev=serial_id_serial0,mode=readline
To manage notifications about this bug go to:
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^ permalink raw reply [flat|nested] 7+ messages in thread* [Qemu-devel] [Bug 1839428] Re: qemu core dumped when repeat "system_reset" multiple times during guest boot
2019-08-08 7:02 [Qemu-devel] [Bug 1839428] [NEW] qemu core dumped when repeat "system_reset" multiple times during guest boot Xujun Ma
2019-08-08 7:26 ` [Qemu-devel] [Bug 1839428] " Xujun Ma
@ 2019-08-15 20:34 ` Philippe Mathieu-Daudé
2019-08-16 9:06 ` Philippe Mathieu-Daudé
` (3 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: Philippe Mathieu-Daudé @ 2019-08-15 20:34 UTC (permalink / raw)
To: qemu-devel
** Changed in: qemu
Status: New => Confirmed
--
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1839428
Title:
qemu core dumped when repeat "system_reset" multiple times during
guest boot
Status in QEMU:
Confirmed
Bug description:
commit 864ab314f1d924129d06ac7b571f105a2b76a4b2 (HEAD, tag: v4.1.0-rc4, origin/master, origin/HEAD, master)
Test arch:x86 and power
Steps:
1.Boot up guest with command
power cmdline:
/usr/libexec/backup/qemu-kvm \
-smp 8 \
-m 4096 \
-nodefaults \
-device virtio-blk-pci,id=image1,drive=drive_image1,bootindex=1,bus=pci.0,addr=0x7 \
-drive file=rhel77-ppc64le-virtio.qcow2,if=none,id=drive_image1,format=qcow2,cache=none \
-chardev stdio,mux=on,id=serial_id_serial0,server,nowait,signal=off \
-device spapr-vty,id=serial111,chardev=serial_id_serial0 \
-mon chardev=serial_id_serial0,mode=readline \
x86 cmdline:
/usr/libexec/qemu-kvm \
-m 4096 -smp 8 \
-boot menu=on \
-device virtio-blk-pci,id=image1,drive=drive_image1\
-drive file=rhel77-64-virtio.qcow2,if=none,id=drive_image1,format=qcow2,cache=none \
-vga std \
-vnc :9 \
-nographic \
-device virtio-net-pci,netdev=net0,id=nic0,mac=52:54:00:c4:e7:84 \
-netdev tap,id=net0,script=/etc/qemu-ifup,downscript=/etc/qemu-ifdown,vhost=on \
2.when guest start to boot up kernel(when no output infomation),run
hmp command "system_reset"
Result:
Sometimes,qemu core dumped with error as following:
system_reset
(qemu) qemu-system-ppc64: /root/qemu/hw/virtio/virtio.c:225: vring_get_region_caches: Assertion `caches != NULL' failed.
b.sh: line 11: 73679 Aborted (core dumped) /usr/local/bin/qemu-system-ppc64 -enable-kvm -smp 8 -m 4096 -nodefaults -device virtio-blk-pci,id=image1,drive=drive_image1,bootindex=1,bus=pci.0,addr=0x7 -drive file=rhel77-ppc64le-virtio.qcow2,if=none,id=drive_image1,format=qcow2,cache=none -chardev stdio,mux=on,id=serial_id_serial0,server,nowait,signal=off -device spapr-vty,id=serial111,chardev=serial_id_serial0 -mon chardev=serial_id_serial0,mode=readline
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1839428/+subscriptions
^ permalink raw reply [flat|nested] 7+ messages in thread* [Qemu-devel] [Bug 1839428] Re: qemu core dumped when repeat "system_reset" multiple times during guest boot
2019-08-08 7:02 [Qemu-devel] [Bug 1839428] [NEW] qemu core dumped when repeat "system_reset" multiple times during guest boot Xujun Ma
2019-08-08 7:26 ` [Qemu-devel] [Bug 1839428] " Xujun Ma
2019-08-15 20:34 ` Philippe Mathieu-Daudé
@ 2019-08-16 9:06 ` Philippe Mathieu-Daudé
2019-08-27 6:16 ` Xujun Ma
` (2 subsequent siblings)
5 siblings, 0 replies; 7+ messages in thread
From: Philippe Mathieu-Daudé @ 2019-08-16 9:06 UTC (permalink / raw)
To: qemu-devel
This issue is very hard to reproduce.
It sometimes crashes, so I could mark few commits 'bad' while bisecting,
but since it is not reliable, I'm not sure a commit is 'good' when there
is no crash.
For now after hours of testing I could reduce Xujun Ma's range to
qemu-v3.1.0..1d31f1872b:
commit 1d31f1872b337e4acac5bf6b3c2a45b66e43b494 (refs/bisect/bad)
Merge: 20b084c4b1 88c869198a
Author: Peter Maydell <peter.maydell@linaro.org>
Date: Mon Mar 4 11:04:31 2019 +0000
Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into staging
pci, pc, virtio: fixes, cleanups, tests
Lots of work on tests: BiosTablesTest UEFI app,
vhost-user testing for non-Linux hosts.
Misc cleanups and fixes all over the place
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
* remotes/mst/tags/for_upstream: (26 commits)
pci: Sanity test minimum downstream LNKSTA
hw/smbios: fix offset of type 3 sku field
pci: Move NVIDIA vendor id to the rest of ids
virtio-balloon: Safely handle BALLOON_PAGE_SIZE < host page size
virtio-balloon: Use ram_block_discard_range() instead of raw madvise()
virtio-balloon: Rework ballon_page() interface
virtio-balloon: Corrections to address verification
virtio-balloon: Remove unnecessary MADV_WILLNEED on deflate
i386/kvm: ignore masked irqs when update msi routes
contrib/vhost-user-blk: fix the compilation issue
Revert "contrib/vhost-user-blk: fix the compilation issue"
pc-dimm: use same mechanism for [get|set]_addr
tests/data: introduce "uefi-boot-images" with the "bios-tables-test" ISOs
tests/uefi-test-tools: add build scripts
tests: introduce "uefi-test-tools" with the BiosTablesTest UEFI app
roms: build the EfiRom utility from the roms/edk2 submodule
roms: add the edk2 project as a git submodule
vhost-user-test: create a temporary directory per TestServer
vhost-user-test: small changes to init_hugepagefs
vhost-user-test: create a main loop per TestServer
...
--
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1839428
Title:
qemu core dumped when repeat "system_reset" multiple times during
guest boot
Status in QEMU:
Confirmed
Bug description:
commit 864ab314f1d924129d06ac7b571f105a2b76a4b2 (HEAD, tag: v4.1.0-rc4, origin/master, origin/HEAD, master)
Test arch:x86 and power
Steps:
1.Boot up guest with command
power cmdline:
/usr/libexec/backup/qemu-kvm \
-smp 8 \
-m 4096 \
-nodefaults \
-device virtio-blk-pci,id=image1,drive=drive_image1,bootindex=1,bus=pci.0,addr=0x7 \
-drive file=rhel77-ppc64le-virtio.qcow2,if=none,id=drive_image1,format=qcow2,cache=none \
-chardev stdio,mux=on,id=serial_id_serial0,server,nowait,signal=off \
-device spapr-vty,id=serial111,chardev=serial_id_serial0 \
-mon chardev=serial_id_serial0,mode=readline \
x86 cmdline:
/usr/libexec/qemu-kvm \
-m 4096 -smp 8 \
-boot menu=on \
-device virtio-blk-pci,id=image1,drive=drive_image1\
-drive file=rhel77-64-virtio.qcow2,if=none,id=drive_image1,format=qcow2,cache=none \
-vga std \
-vnc :9 \
-nographic \
-device virtio-net-pci,netdev=net0,id=nic0,mac=52:54:00:c4:e7:84 \
-netdev tap,id=net0,script=/etc/qemu-ifup,downscript=/etc/qemu-ifdown,vhost=on \
2.when guest start to boot up kernel(when no output infomation),run
hmp command "system_reset"
Result:
Sometimes,qemu core dumped with error as following:
system_reset
(qemu) qemu-system-ppc64: /root/qemu/hw/virtio/virtio.c:225: vring_get_region_caches: Assertion `caches != NULL' failed.
b.sh: line 11: 73679 Aborted (core dumped) /usr/local/bin/qemu-system-ppc64 -enable-kvm -smp 8 -m 4096 -nodefaults -device virtio-blk-pci,id=image1,drive=drive_image1,bootindex=1,bus=pci.0,addr=0x7 -drive file=rhel77-ppc64le-virtio.qcow2,if=none,id=drive_image1,format=qcow2,cache=none -chardev stdio,mux=on,id=serial_id_serial0,server,nowait,signal=off -device spapr-vty,id=serial111,chardev=serial_id_serial0 -mon chardev=serial_id_serial0,mode=readline
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1839428/+subscriptions
^ permalink raw reply [flat|nested] 7+ messages in thread* [Qemu-devel] [Bug 1839428] Re: qemu core dumped when repeat "system_reset" multiple times during guest boot
2019-08-08 7:02 [Qemu-devel] [Bug 1839428] [NEW] qemu core dumped when repeat "system_reset" multiple times during guest boot Xujun Ma
` (2 preceding siblings ...)
2019-08-16 9:06 ` Philippe Mathieu-Daudé
@ 2019-08-27 6:16 ` Xujun Ma
2019-09-18 13:17 ` Stefan Hajnoczi
2020-01-09 13:40 ` Thomas Huth
5 siblings, 0 replies; 7+ messages in thread
From: Xujun Ma @ 2019-08-27 6:16 UTC (permalink / raw)
To: qemu-devel
I found the commit that introduced this regression.
commit 57830a499f7c815bb0cb325c94a3d8c910d13cfa (HEAD)
Author: Denis Plotnikov <dplotnikov@virtuozzo.com>
Date: Fri Feb 15 16:03:25 2019 +0300
block: don't set the same context
Adds a fast path on aio context setting preventing
unnecessary context setting routine.
Also, it prevents issues with cyclic walk of child
bds-es appeared because of registering aio walking
notifiers:
Call stack:
0 __GI_raise
1 __GI_abort
2 __assert_fail_base
3 __GI___assert_fail
4 bdrv_detach_aio_context (bs=0x55f54d65c000) <<<
5 bdrv_detach_aio_context (bs=0x55f54fc8a800)
6 bdrv_set_aio_context (bs=0x55f54fc8a800, ...)
7 block_job_attached_aio_context
8 bdrv_attach_aio_context (bs=0x55f54d65c000, ...) <<<
9 bdrv_set_aio_context (bs=0x55f54d65c000)
10 blk_set_aio_context
11 virtio_blk_data_plane_stop
12 virtio_bus_stop_ioeventfd
13 virtio_vmstate_change
14 vm_state_notify (running=0, state=RUN_STATE_SHUTDOWN)
15 do_vm_stop (state=RUN_STATE_SHUTDOWN, send_stop=true)
16 vm_stop (state=RUN_STATE_SHUTDOWN)
17 main_loop_should_exit
18 main_loop
19 main
This can happen because of "new" context attachment to VM disk bds.
When attaching a new context the corresponding aio context handler is
called for each of aio_notifiers registered on the VM disk bds context.
Among those handlers, there is the block_job_attached_aio_context handler
which sets a new aio context for the block job bds. When doing so,
the old context is detached from all the block job bds children and one of
them is the VM disk bds, serving as backing store for the blockjob bds,
although the VM disk bds is actually the initializer of that process.
Since the VM disk bds is protected with walking_aio_notifiers flag
from double processing in recursive calls, the assert fires.
Signed-off-by: Denis Plotnikov <dplotnikov@virtuozzo.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
diff --git a/block.c b/block.c
index 4ad0e90d7e..0c12632661 100644
--- a/block.c
+++ b/block.c
@@ -5265,6 +5265,10 @@ void bdrv_set_aio_context(BlockDriverState *bs, AioContext *new_context)
{
AioContext *ctx = bdrv_get_aio_context(bs);
+ if (ctx == new_context) {
+ return;
+ }
+
aio_disable_external(ctx);
bdrv_parent_drained_begin(bs, NULL, false);
bdrv_drain(bs); /* ensure there are no in-flight requests */
--
You received this bug notification because you are a member of qemu-
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https://bugs.launchpad.net/bugs/1839428
Title:
qemu core dumped when repeat "system_reset" multiple times during
guest boot
Status in QEMU:
Confirmed
Bug description:
commit 864ab314f1d924129d06ac7b571f105a2b76a4b2 (HEAD, tag: v4.1.0-rc4, origin/master, origin/HEAD, master)
Test arch:x86 and power
Steps:
1.Boot up guest with command
power cmdline:
/usr/libexec/backup/qemu-kvm \
-smp 8 \
-m 4096 \
-nodefaults \
-device virtio-blk-pci,id=image1,drive=drive_image1,bootindex=1,bus=pci.0,addr=0x7 \
-drive file=rhel77-ppc64le-virtio.qcow2,if=none,id=drive_image1,format=qcow2,cache=none \
-chardev stdio,mux=on,id=serial_id_serial0,server,nowait,signal=off \
-device spapr-vty,id=serial111,chardev=serial_id_serial0 \
-mon chardev=serial_id_serial0,mode=readline \
x86 cmdline:
/usr/libexec/qemu-kvm \
-m 4096 -smp 8 \
-boot menu=on \
-device virtio-blk-pci,id=image1,drive=drive_image1\
-drive file=rhel77-64-virtio.qcow2,if=none,id=drive_image1,format=qcow2,cache=none \
-vga std \
-vnc :9 \
-nographic \
-device virtio-net-pci,netdev=net0,id=nic0,mac=52:54:00:c4:e7:84 \
-netdev tap,id=net0,script=/etc/qemu-ifup,downscript=/etc/qemu-ifdown,vhost=on \
2.when guest start to boot up kernel(when no output infomation),run
hmp command "system_reset"
Result:
Sometimes,qemu core dumped with error as following:
system_reset
(qemu) qemu-system-ppc64: /root/qemu/hw/virtio/virtio.c:225: vring_get_region_caches: Assertion `caches != NULL' failed.
b.sh: line 11: 73679 Aborted (core dumped) /usr/local/bin/qemu-system-ppc64 -enable-kvm -smp 8 -m 4096 -nodefaults -device virtio-blk-pci,id=image1,drive=drive_image1,bootindex=1,bus=pci.0,addr=0x7 -drive file=rhel77-ppc64le-virtio.qcow2,if=none,id=drive_image1,format=qcow2,cache=none -chardev stdio,mux=on,id=serial_id_serial0,server,nowait,signal=off -device spapr-vty,id=serial111,chardev=serial_id_serial0 -mon chardev=serial_id_serial0,mode=readline
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1839428/+subscriptions
^ permalink raw reply related [flat|nested] 7+ messages in thread* [Qemu-devel] [Bug 1839428] Re: qemu core dumped when repeat "system_reset" multiple times during guest boot
2019-08-08 7:02 [Qemu-devel] [Bug 1839428] [NEW] qemu core dumped when repeat "system_reset" multiple times during guest boot Xujun Ma
` (3 preceding siblings ...)
2019-08-27 6:16 ` Xujun Ma
@ 2019-09-18 13:17 ` Stefan Hajnoczi
2020-01-09 13:40 ` Thomas Huth
5 siblings, 0 replies; 7+ messages in thread
From: Stefan Hajnoczi @ 2019-09-18 13:17 UTC (permalink / raw)
To: qemu-devel
Please check if this commit has solved the issue:
https://git.qemu.org/?p=qemu.git;a=commit;h=ebb6ff25cd888a52a64a9adc3692541c6d1d9a42
--
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1839428
Title:
qemu core dumped when repeat "system_reset" multiple times during
guest boot
Status in QEMU:
Confirmed
Bug description:
commit 864ab314f1d924129d06ac7b571f105a2b76a4b2 (HEAD, tag: v4.1.0-rc4, origin/master, origin/HEAD, master)
Test arch:x86 and power
Steps:
1.Boot up guest with command
power cmdline:
/usr/libexec/backup/qemu-kvm \
-smp 8 \
-m 4096 \
-nodefaults \
-device virtio-blk-pci,id=image1,drive=drive_image1,bootindex=1,bus=pci.0,addr=0x7 \
-drive file=rhel77-ppc64le-virtio.qcow2,if=none,id=drive_image1,format=qcow2,cache=none \
-chardev stdio,mux=on,id=serial_id_serial0,server,nowait,signal=off \
-device spapr-vty,id=serial111,chardev=serial_id_serial0 \
-mon chardev=serial_id_serial0,mode=readline \
x86 cmdline:
/usr/libexec/qemu-kvm \
-m 4096 -smp 8 \
-boot menu=on \
-device virtio-blk-pci,id=image1,drive=drive_image1\
-drive file=rhel77-64-virtio.qcow2,if=none,id=drive_image1,format=qcow2,cache=none \
-vga std \
-vnc :9 \
-nographic \
-device virtio-net-pci,netdev=net0,id=nic0,mac=52:54:00:c4:e7:84 \
-netdev tap,id=net0,script=/etc/qemu-ifup,downscript=/etc/qemu-ifdown,vhost=on \
2.when guest start to boot up kernel(when no output infomation),run
hmp command "system_reset"
Result:
Sometimes,qemu core dumped with error as following:
system_reset
(qemu) qemu-system-ppc64: /root/qemu/hw/virtio/virtio.c:225: vring_get_region_caches: Assertion `caches != NULL' failed.
b.sh: line 11: 73679 Aborted (core dumped) /usr/local/bin/qemu-system-ppc64 -enable-kvm -smp 8 -m 4096 -nodefaults -device virtio-blk-pci,id=image1,drive=drive_image1,bootindex=1,bus=pci.0,addr=0x7 -drive file=rhel77-ppc64le-virtio.qcow2,if=none,id=drive_image1,format=qcow2,cache=none -chardev stdio,mux=on,id=serial_id_serial0,server,nowait,signal=off -device spapr-vty,id=serial111,chardev=serial_id_serial0 -mon chardev=serial_id_serial0,mode=readline
To manage notifications about this bug go to:
https://bugs.launchpad.net/qemu/+bug/1839428/+subscriptions
^ permalink raw reply [flat|nested] 7+ messages in thread* [Bug 1839428] Re: qemu core dumped when repeat "system_reset" multiple times during guest boot
2019-08-08 7:02 [Qemu-devel] [Bug 1839428] [NEW] qemu core dumped when repeat "system_reset" multiple times during guest boot Xujun Ma
` (4 preceding siblings ...)
2019-09-18 13:17 ` Stefan Hajnoczi
@ 2020-01-09 13:40 ` Thomas Huth
5 siblings, 0 replies; 7+ messages in thread
From: Thomas Huth @ 2020-01-09 13:40 UTC (permalink / raw)
To: qemu-devel
** Changed in: qemu
Status: Confirmed => Fix Released
--
You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1839428
Title:
qemu core dumped when repeat "system_reset" multiple times during
guest boot
Status in QEMU:
Fix Released
Bug description:
commit 864ab314f1d924129d06ac7b571f105a2b76a4b2 (HEAD, tag: v4.1.0-rc4, origin/master, origin/HEAD, master)
Test arch:x86 and power
Steps:
1.Boot up guest with command
power cmdline:
/usr/libexec/backup/qemu-kvm \
-smp 8 \
-m 4096 \
-nodefaults \
-device virtio-blk-pci,id=image1,drive=drive_image1,bootindex=1,bus=pci.0,addr=0x7 \
-drive file=rhel77-ppc64le-virtio.qcow2,if=none,id=drive_image1,format=qcow2,cache=none \
-chardev stdio,mux=on,id=serial_id_serial0,server,nowait,signal=off \
-device spapr-vty,id=serial111,chardev=serial_id_serial0 \
-mon chardev=serial_id_serial0,mode=readline \
x86 cmdline:
/usr/libexec/qemu-kvm \
-m 4096 -smp 8 \
-boot menu=on \
-device virtio-blk-pci,id=image1,drive=drive_image1\
-drive file=rhel77-64-virtio.qcow2,if=none,id=drive_image1,format=qcow2,cache=none \
-vga std \
-vnc :9 \
-nographic \
-device virtio-net-pci,netdev=net0,id=nic0,mac=52:54:00:c4:e7:84 \
-netdev tap,id=net0,script=/etc/qemu-ifup,downscript=/etc/qemu-ifdown,vhost=on \
2.when guest start to boot up kernel(when no output infomation),run
hmp command "system_reset"
Result:
Sometimes,qemu core dumped with error as following:
system_reset
(qemu) qemu-system-ppc64: /root/qemu/hw/virtio/virtio.c:225: vring_get_region_caches: Assertion `caches != NULL' failed.
b.sh: line 11: 73679 Aborted (core dumped) /usr/local/bin/qemu-system-ppc64 -enable-kvm -smp 8 -m 4096 -nodefaults -device virtio-blk-pci,id=image1,drive=drive_image1,bootindex=1,bus=pci.0,addr=0x7 -drive file=rhel77-ppc64le-virtio.qcow2,if=none,id=drive_image1,format=qcow2,cache=none -chardev stdio,mux=on,id=serial_id_serial0,server,nowait,signal=off -device spapr-vty,id=serial111,chardev=serial_id_serial0 -mon chardev=serial_id_serial0,mode=readline
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