Random VM crashes with a SPICE vm: QEMU free(): corrupted unsorted chunks

garbled said:
Code: 
root@ukdah:~# pveversion -v
proxmox-ve: 8.1.0 (running kernel: 6.5.11-7-pve)
pve-manager: 8.1.4 (running version: 8.1.4/ec5affc9e41f1d79)
proxmox-kernel-helper: 8.1.0
pve-kernel-5.15: 7.4-9
proxmox-kernel-6.5: 6.5.11-7
proxmox-kernel-6.5.11-7-pve-signed: 6.5.11-7
pve-kernel-5.0: 6.0-11
pve-kernel-5.15.131-2-pve: 5.15.131-3
pve-kernel-5.4.166-1-pve: 5.4.166-1
pve-kernel-5.0.21-5-pve: 5.0.21-10
pve-kernel-5.0.15-1-pve: 5.0.15-1
ceph: 18.2.1-pve2
ceph-fuse: 18.2.1-pve2
corosync: 3.1.7-pve3
criu: 3.17.1-2
glusterfs-client: 10.3-5
ifupdown: residual config
ifupdown2: 3.2.0-1+pmx8
ksm-control-daemon: 1.4-1
libjs-extjs: 7.0.0-4
libknet1: 1.28-pve1
libproxmox-acme-perl: 1.5.0
libproxmox-backup-qemu0: 1.4.1
libproxmox-rs-perl: 0.3.3
libpve-access-control: 8.0.7
libpve-apiclient-perl: 3.3.1
libpve-common-perl: 8.1.0
libpve-guest-common-perl: 5.0.6
libpve-http-server-perl: 5.0.5
libpve-network-perl: 0.9.5
libpve-rs-perl: 0.8.8
libpve-storage-perl: 8.0.5
libqb0: 1.0.5-1
libspice-server1: 0.15.1-1
lvm2: 2.03.16-2
lxc-pve: 5.0.2-4
lxcfs: 5.0.3-pve4
novnc-pve: 1.4.0-3
proxmox-backup-client: 3.1.2-1
proxmox-backup-file-restore: 3.1.2-1
proxmox-kernel-helper: 8.1.0
proxmox-mail-forward: 0.2.3
proxmox-mini-journalreader: 1.4.0
proxmox-offline-mirror-helper: 0.6.4
proxmox-widget-toolkit: 4.1.3
pve-cluster: 8.0.5
pve-container: 5.0.8
pve-docs: 8.1.3
pve-edk2-firmware: 4.2023.08-3
pve-firewall: 5.0.3
pve-firmware: 3.9-1
pve-ha-manager: 4.0.3
pve-i18n: 3.2.0
pve-qemu-kvm: 8.1.2-6
pve-xtermjs: 5.3.0-3
qemu-server: 8.0.10
smartmontools: 7.3-pve1
spiceterm: 3.3.0
swtpm: 0.8.0+pve1
vncterm: 1.8.0
zfsutils-linux: 2.2.2-pve1


Code: 
root@ukdah:~# qm config 146
agent: 1
audio0: device=ich9-intel-hda,driver=spice
balloon: 8096
boot: order=scsi0;net0
cores: 6
cpu: x86-64-v2-AES
description: * Bullseye template for debian workstation%0A* needs%3A spice-vdagent rxvt-unicode%0A* Workstation (polaris)
memory: 24448
meta: creation-qemu=6.1.1,ctime=1651942626
name: bullseye-04
net0: virtio=7E:8C:66:91:6D:66,bridge=vmbr0,firewall=1
numa: 0
onboot: 1
ostype: l26
scsi0: vm_rbd:vm-146-disk-0,discard=on,size=32G
scsihw: virtio-scsi-pci
smbios1: uuid=8df17a61-829f-401c-8cb9-ce991922d8eb
sockets: 1
tags: ukdah
usb0: spice
usb1: spice
usb2: spice
usb3: spice
vga: qxl2,memory=128
vmgenid: 388b854f-8226-4b9c-9109-4526090ab0ca

The last few times it crashed (2-3 since last post), the message was the same segfault. I've installed the coredump tool, so will see if that produces anything. Thanks!

Also possibly worth noting, usually it happens when I click something in firefox on the VM. (not some random link on the interwebs, but things I do all the time like clicking around the proxmox gui, or logging into truenas, etc etc), but that could be a red herring since half my time is spent clicking i suppose.
Click to expand...
Also 8.1.4
 
in 8.0-2 there was a libspice-server1_0.15.1-1_amd64.deb package. He's the same now. In theory, it's not about that, but about the adjacent code.
 
Talking with a friend we discussed different possibility to debug a heap corruption. Glibc has some facilities to enable some debugging. One short page I found explaining is https://www.gnu.org/software/libc/manual/html_node/Heap-Consistency-Checking.html.
To sum up you can add some environment like
Code: 
MALLOC_CHECK_=3 LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libc_malloc_debug.so.0
to qemu execution (you need to find your debug library, it should be with same name under /usr). How to add environments to Qemu while executing under Proxmox I don't know. In libvirt you can change the XML file editing it with "virsh edit" command.

Another option we discussed was address sanitizer but it needs recompiling the software so it's not easy.
 
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Reactions: fiona
You can run the following in the CLI to start the VM with the additonal environment variables set:
Code: 
MALLOC_CHECK_=3 LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libc_malloc_debug.so.0 qm start XYZ
You can verify that the deug library is loaded with
Code: 
grep libc_malloc_debug /proc/$(cat /var/run/qemu-server/XYZ.pid)/maps
In both cases, replace XYZ with the actual ID of the VM of course.
 
There also is QEMU 9.0 available on the pvetest repository. You could give it a try to see if the issue was resolved on the QEMU side since QEMU 8.1. After installing, you need to shutdown+start a VM, Reboot via Web UI (reboot within the guest is not enough!) or live-migrate to an upgraded node to have the VM actually use the new binary.
 
One host with debug option. New crash. Where can I find more debug info from libc_malloc_debug.so.0?
Code: 
Jun 03 10:24:05 vdi3 systemd-coredump[2467508]: [] Process 3636863 (kvm) of user 0 dumped core.

                                                Module libsystemd.so.0 from deb systemd-252.22-1~deb12u1.amd64
                                                Module libudev.so.1 from deb systemd-252.22-1~deb12u1.amd64
                                                Stack trace of thread 3636896:
                                                #0  0x00007213623aa401 unlink_chunk (libc_malloc_debug.so.0 + 0x3401)
                                                #1  0x00007213623abfca _int_malloc (libc_malloc_debug.so.0 + 0x4fca)
                                                #2  0x00007213623ac1b9 malloc_check (libc_malloc_debug.so.0 + 0x51b9)
                                                #3  0x00007213623acdf5 __debug_malloc (libc_malloc_debug.so.0 + 0x5df5)
                                                #4  0x00007213619ed679 g_malloc (libglib-2.0.so.0 + 0x5a679)
                                                #5  0x0000721361a07d00 g_memdup2 (libglib-2.0.so.0 + 0x74d00)
                                                #6  0x00007213620d802b n/a (libspice-server.so.1 + 0x4102b)
                                                #7  0x00007213620e90f5 n/a (libspice-server.so.1 + 0x520f5)
                                                #8  0x00007213620e928b n/a (libspice-server.so.1 + 0x5228b)
                                                #9  0x00007213620e9cac n/a (libspice-server.so.1 + 0x52cac)
                                                #10 0x00007213619e77a9 g_main_context_dispatch (libglib-2.0.so.0 + 0x547a9)
                                                #11 0x00007213619e7a38 n/a (libglib-2.0.so.0 + 0x54a38)
                                                #12 0x00007213619e7cef g_main_loop_run (libglib-2.0.so.0 + 0x54cef)
                                                #13 0x00007213620e8fa9 n/a (libspice-server.so.1 + 0x51fa9)
                                                #14 0x00007213600e3134 start_thread (libc.so.6 + 0x89134)
                                                #15 0x00007213601637dc __clone3 (libc.so.6 + 0x1097dc)

                                                Stack trace of thread 3636890:
                                                #0  0x0000721360157c5b __GI___ioctl (libc.so.6 + 0xfdc5b)
                                                #1  0x00005d1b71b086cf kvm_vcpu_ioctl (qemu-system-x86_64 + 0x72c6cf)
                                                #2  0x00005d1b71b08ba5 kvm_cpu_exec (qemu-system-x86_64 + 0x72cba5)
                                                #3  0x00005d1b71b0a08d kvm_vcpu_thread_fn (qemu-system-x86_64 + 0x72e08d)
                                                #4  0x00005d1b71ca22d8 qemu_thread_start (qemu-system-x86_64 + 0x8c62d8)
                                                #5  0x00007213600e3134 start_thread (libc.so.6 + 0x89134)
                                                #6  0x00007213601637dc __clone3 (libc.so.6 + 0x1097dc)

                                                Stack trace of thread 3636864:
                                                #0  0x000072136015b719 syscall (libc.so.6 + 0x101719)
                                                #1  0x00005d1b71ca345a qemu_futex_wait (qemu-system-x86_64 + 0x8c745a)
                                                #2  0x00005d1b71cacd62 call_rcu_thread (qemu-system-x86_64 + 0x8d0d62)
                                                #3  0x00005d1b71ca22d8 qemu_thread_start (qemu-system-x86_64 + 0x8c62d8)
                                                #4  0x00007213600e3134 start_thread (libc.so.6 + 0x89134)
                                                #5  0x00007213601637dc __clone3 (libc.so.6 + 0x1097dc)

                                                Stack trace of thread 3636893:
                                                #0  0x0000721360157c5b __GI___ioctl (libc.so.6 + 0xfdc5b)
                                                #1  0x00005d1b71b086cf kvm_vcpu_ioctl (qemu-system-x86_64 + 0x72c6cf)
                                                #2  0x00005d1b71b08ba5 kvm_cpu_exec (qemu-system-x86_64 + 0x72cba5)
                                                #3  0x00005d1b71b0a08d kvm_vcpu_thread_fn (qemu-system-x86_64 + 0x72e08d)
                                                #4  0x00005d1b71ca22d8 qemu_thread_start (qemu-system-x86_64 + 0x8c62d8)
                                                #5  0x00007213600e3134 start_thread (libc.so.6 + 0x89134)
                                                #6  0x00007213601637dc __clone3 (libc.so.6 + 0x1097dc)

                                                Stack trace of thread 3636892:
                                                #0  0x0000721360157c5b __GI___ioctl (libc.so.6 + 0xfdc5b)
                                                #1  0x00005d1b71b086cf kvm_vcpu_ioctl (qemu-system-x86_64 + 0x72c6cf)
                                                #2  0x00005d1b71b08ba5 kvm_cpu_exec (qemu-system-x86_64 + 0x72cba5)
                                                #3  0x00005d1b71b0a08d kvm_vcpu_thread_fn (qemu-system-x86_64 + 0x72e08d)
                                                #4  0x00005d1b71ca22d8 qemu_thread_start (qemu-system-x86_64 + 0x8c62d8)
                                                #5  0x00007213600e3134 start_thread (libc.so.6 + 0x89134)
                                                #6  0x00007213601637dc __clone3 (libc.so.6 + 0x1097dc)

                                                Stack trace of thread 3636895:
                                                #0  0x000072136015615f __GI___poll (libc.so.6 + 0xfc15f)
                                                #1  0x00007213619e79ae n/a (libglib-2.0.so.0 + 0x549ae)
                                                #2  0x00007213619e7cef g_main_loop_run (libglib-2.0.so.0 + 0x54cef)
                                                #3  0x00007213620e8fa9 n/a (libspice-server.so.1 + 0x51fa9)
                                                #4  0x00007213600e3134 start_thread (libc.so.6 + 0x89134)
                                                #5  0x00007213601637dc __clone3 (libc.so.6 + 0x1097dc)

                                                Stack trace of thread 2425743:
                                                #0  0x00007213600dfe96 __futex_abstimed_wait_common64 (libc.so.6 + 0x85e96)
                                                #1  0x00007213600e283c __pthread_cond_wait_common (libc.so.6 + 0x8883c)
                                                #2  0x00005d1b71ca2461 qemu_cond_timedwait_ts (qemu-system-x86_64 + 0x8c6461)
                                                #3  0x00005d1b71ca3000 qemu_cond_timedwait_impl (qemu-system-x86_64 + 0x8c7000)
                                                #4  0x00005d1b71cb7834 worker_thread (qemu-system-x86_64 + 0x8db834)
                                                #5  0x00005d1b71ca22d8 qemu_thread_start (qemu-system-x86_64 + 0x8c62d8)
                                                #6  0x00007213600e3134 start_thread (libc.so.6 + 0x89134)
                                                #7  0x00007213601637dc __clone3 (libc.so.6 + 0x1097dc)

                                                Stack trace of thread 3636898:
                                                #0  0x00007213600dfe96 __futex_abstimed_wait_common64 (libc.so.6 + 0x85e96)
                                                #1  0x00007213600e2558 __pthread_cond_wait_common (libc.so.6 + 0x88558)
                                                #2  0x00005d1b71ca2deb qemu_cond_wait_impl (qemu-system-x86_64 + 0x8c6deb)
                                                #3  0x00005d1b7172ef2b vnc_worker_thread_loop (qemu-system-x86_64 + 0x352f2b)
                                                #4  0x00005d1b7172fbc8 vnc_worker_thread (qemu-system-x86_64 + 0x353bc8)
                                                #5  0x00005d1b71ca22d8 qemu_thread_start (qemu-system-x86_64 + 0x8c62d8)
                                                #6  0x00007213600e3134 start_thread (libc.so.6 + 0x89134)
                                                #7  0x00007213601637dc __clone3 (libc.so.6 + 0x1097dc)

                                                Stack trace of thread 3636863:
                                                #0  0x0000721360156256 __ppoll (libc.so.6 + 0xfc256)
                                                #1  0x00005d1b71cb855e ppoll (qemu-system-x86_64 + 0x8dc55e)
                                                #2  0x00005d1b71cb5e4e os_host_main_loop_wait (qemu-system-x86_64 + 0x8d9e4e)
                                                #3  0x00005d1b71912aa7 qemu_main_loop (qemu-system-x86_64 + 0x536aa7)
                                                #4  0x00005d1b71b12f46 qemu_default_main (qemu-system-x86_64 + 0x736f46)
                                                #5  0x000072136008124a __libc_start_call_main (libc.so.6 + 0x2724a)
                                                #6  0x0000721360081305 __libc_start_main_impl (libc.so.6 + 0x27305)
                                                #7  0x00005d1b717050a1 _start (qemu-system-x86_64 + 0x3290a1)

                                                Stack trace of thread 3636891:
                                                #0  0x0000721360157c5b __GI___ioctl (libc.so.6 + 0xfdc5b)
                                                #1  0x00005d1b71b086cf kvm_vcpu_ioctl (qemu-system-x86_64 + 0x72c6cf)
                                                #2  0x00005d1b71b08ba5 kvm_cpu_exec (qemu-system-x86_64 + 0x72cba5)
                                                #3  0x00005d1b71b0a08d kvm_vcpu_thread_fn (qemu-system-x86_64 + 0x72e08d)
                                                #4  0x00005d1b71ca22d8 qemu_thread_start (qemu-system-x86_64 + 0x8c62d8)
                                                #5  0x00007213600e3134 start_thread (libc.so.6 + 0x89134)
                                                #6  0x00007213601637dc __clone3 (libc.so.6 + 0x1097dc)
                                                ELF object binary architecture: AMD x86-64

One host was updated to qemu 9.
 
DeeMaas said:
One host with debug option. New crash. Where can I find more debug info from libc_malloc_debug.so.0?
Click to expand...
Is there anything interesting in the system log/journal before the crash trace?

DeeMaas said:
One host was updated to qemu 9.
Click to expand...
So a different one then the one that just had the crash?
 
fiona said:
Is there anything interesting in the system log/journal before the crash trace?
Click to expand...
Just this
Code: 
Jun 03 11:52:09 vdi3 kernel: SPICE Worker[3635472]: segfault at 5eaf43bf9820 ip 000074232cf9a401 sp 00007421987fadd0 error 4 in libc_malloc_debug.so.0[74232cf99000+6000] likely on CPU 75 (core 3, socket 1)
Jun 03 11:52:09 vdi3 kernel: Code: 08 48 89 c8 48 83 e0 f8 48 3b 04 07 0f 85 a9 00 00 00 f3 0f 6f 47 10 48 8b 77 10 48 8b 57 18 66 48 0f 7e c0 48 3b 78 18 75 77 <48> 3b 7a 10 75 71 48 89 50 18 66 0f d6 42 10 48 81 f9 ff 03 00 00
fiona said:
So a different one then the one that just had the crash?
Click to expand...
The crash was on qemu 8.1 with libc_malloc_debug.so, it has not been on qemu 9.0 yet
 
qemu 9 not helped
Code: 
Jun 04 11:16:15 vdi3 kernel: show_signal_msg: 16 callbacks suppressed
Jun 04 11:16:15 vdi3 kernel: SPICE Worker[6633]: segfault at 7cb4540000a0 ip 00007cb707d94fcd sp 00007cb575dfaeb0 error 4 in libc.so.6[7cb707d26000+155000] likely on CPU 73 (core 1, socket 1)

Code: 
Jun 04 11:17:16 vdi3 systemd-coredump[1215989]: [] Process 6595 (kvm) of user 0 dumped core.

                                                Module libsystemd.so.0 from deb systemd-252.22-1~deb12u1.amd64
                                                Module libudev.so.1 from deb systemd-252.22-1~deb12u1.amd64
                                                Stack trace of thread 6633:
                                                #0  0x00007cb707d94fcd unlink_chunk (libc.so.6 + 0x94fcd)
                                                #1  0x00007cb707d9626f _int_free (libc.so.6 + 0x9626f)
                                                #2  0x00007cb707d98e8f __GI___libc_free (libc.so.6 + 0x98e8f)
                                                #3  0x00007cb709d7c089 n/a (libspice-server.so.1 + 0x41089)
                                                #4  0x00007cb709d53338 n/a (libspice-server.so.1 + 0x18338)
                                                #5  0x00007cb709d775e3 n/a (libspice-server.so.1 + 0x3c5e3)
                                                #6  0x00007cb709d77700 n/a (libspice-server.so.1 + 0x3c700)
                                                #7  0x00007cb709d6179d n/a (libspice-server.so.1 + 0x2679d)
                                                #8  0x00007cb70968b67f g_main_context_dispatch (libglib-2.0.so.0 + 0x5467f)
                                                #9  0x00007cb70968ba38 n/a (libglib-2.0.so.0 + 0x54a38)
                                                #10 0x00007cb70968bcef g_main_loop_run (libglib-2.0.so.0 + 0x54cef)
                                                #11 0x00007cb709d8cfa9 n/a (libspice-server.so.1 + 0x51fa9)
                                                #12 0x00007cb707d89134 start_thread (libc.so.6 + 0x89134)
                                                #13 0x00007cb707e097dc __clone3 (libc.so.6 + 0x1097dc)

                                                Stack trace of thread 6628:
                                                #0  0x00007cb707dfdc5b __GI___ioctl (libc.so.6 + 0xfdc5b)
                                                #1  0x000064dd853a19c9 kvm_vcpu_ioctl (qemu-system-x86_64 + 0x7ad9c9)
                                                #2  0x000064dd853a1f11 kvm_cpu_exec (qemu-system-x86_64 + 0x7adf11)
                                                #3  0x000064dd853a3755 kvm_vcpu_thread_fn (qemu-system-x86_64 + 0x7af755)
                                                #4  0x000064dd85559e88 qemu_thread_start (qemu-system-x86_64 + 0x965e88)
                                                #5  0x00007cb707d89134 start_thread (libc.so.6 + 0x89134)
                                                #6  0x00007cb707e097dc __clone3 (libc.so.6 + 0x1097dc)

                                                Stack trace of thread 6629:
                                                #0  0x00007cb707dfdc5b __GI___ioctl (libc.so.6 + 0xfdc5b)
                                                #1  0x000064dd853a19c9 kvm_vcpu_ioctl (qemu-system-x86_64 + 0x7ad9c9)
                                                #2  0x000064dd853a1f11 kvm_cpu_exec (qemu-system-x86_64 + 0x7adf11)
                                                #3  0x000064dd853a3755 kvm_vcpu_thread_fn (qemu-system-x86_64 + 0x7af755)
                                                #4  0x000064dd85559e88 qemu_thread_start (qemu-system-x86_64 + 0x965e88)
                                                #5  0x00007cb707d89134 start_thread (libc.so.6 + 0x89134)
                                                #6  0x00007cb707e097dc __clone3 (libc.so.6 + 0x1097dc)

                                                Stack trace of thread 6596:
                                                #0  0x00007cb707e01719 syscall (libc.so.6 + 0x101719)
                                                #1  0x000064dd8555b18a qemu_futex_wait (qemu-system-x86_64 + 0x96718a)
                                                #2  0x000064dd855660e2 call_rcu_thread (qemu-system-x86_64 + 0x9720e2)
                                                #3  0x000064dd85559e88 qemu_thread_start (qemu-system-x86_64 + 0x965e88)
                                                #4  0x00007cb707d89134 start_thread (libc.so.6 + 0x89134)
                                                #5  0x00007cb707e097dc __clone3 (libc.so.6 + 0x1097dc)

                                                Stack trace of thread 6631:
                                                #0  0x00007cb707dfdc5b __GI___ioctl (libc.so.6 + 0xfdc5b)
                                                #1  0x000064dd853a19c9 kvm_vcpu_ioctl (qemu-system-x86_64 + 0x7ad9c9)
                                                #2  0x000064dd853a1f11 kvm_cpu_exec (qemu-system-x86_64 + 0x7adf11)
                                                #3  0x000064dd853a3755 kvm_vcpu_thread_fn (qemu-system-x86_64 + 0x7af755)
                                                #4  0x000064dd85559e88 qemu_thread_start (qemu-system-x86_64 + 0x965e88)
                                                #5  0x00007cb707d89134 start_thread (libc.so.6 + 0x89134)
                                                #6  0x00007cb707e097dc __clone3 (libc.so.6 + 0x1097dc)

                                                Stack trace of thread 6634:
                                                #0  0x00007cb707dfc15f __GI___poll (libc.so.6 + 0xfc15f)
                                                #1  0x00007cb70968b9ae n/a (libglib-2.0.so.0 + 0x549ae)
                                                #2  0x00007cb70968bcef g_main_loop_run (libglib-2.0.so.0 + 0x54cef)
                                                #3  0x00007cb709d8cfa9 n/a (libspice-server.so.1 + 0x51fa9)
                                                #4  0x00007cb707d89134 start_thread (libc.so.6 + 0x89134)
                                                #5  0x00007cb707e097dc __clone3 (libc.so.6 + 0x1097dc)

                                                Stack trace of thread 1213556:
                                                #0  0x00007cb707d85e96 __futex_abstimed_wait_common64 (libc.so.6 + 0x85e96)
                                                #1  0x00007cb707d8883c __pthread_cond_wait_common (libc.so.6 + 0x8883c)
                                                #2  0x000064dd8555a011 qemu_cond_timedwait_ts (qemu-system-x86_64 + 0x966011)
                                                #3  0x000064dd8555acb8 qemu_cond_timedwait_impl (qemu-system-x86_64 + 0x966cb8)
                                                #4  0x000064dd85571a6c worker_thread (qemu-system-x86_64 + 0x97da6c)
                                                #5  0x000064dd85559e88 qemu_thread_start (qemu-system-x86_64 + 0x965e88)
                                                #6  0x00007cb707d89134 start_thread (libc.so.6 + 0x89134)
                                                #7  0x00007cb707e097dc __clone3 (libc.so.6 + 0x1097dc)

                                                Stack trace of thread 6630:
                                                #0  0x00007cb707dfdc5b __GI___ioctl (libc.so.6 + 0xfdc5b)
                                                #1  0x000064dd853a19c9 kvm_vcpu_ioctl (qemu-system-x86_64 + 0x7ad9c9)
                                                #2  0x000064dd853a1f11 kvm_cpu_exec (qemu-system-x86_64 + 0x7adf11)
                                                #3  0x000064dd853a3755 kvm_vcpu_thread_fn (qemu-system-x86_64 + 0x7af755)
                                                #4  0x000064dd85559e88 qemu_thread_start (qemu-system-x86_64 + 0x965e88)
                                                #5  0x00007cb707d89134 start_thread (libc.so.6 + 0x89134)
                                                #6  0x00007cb707e097dc __clone3 (libc.so.6 + 0x1097dc)

                                                Stack trace of thread 6595:
                                                #0  0x00007cb707dfc256 __ppoll (libc.so.6 + 0xfc256)
                                                #1  0x000064dd8557283e ppoll (qemu-system-x86_64 + 0x97e83e)
                                                #2  0x000064dd8556fc6e os_host_main_loop_wait (qemu-system-x86_64 + 0x97bc6e)
                                                #3  0x000064dd8518a1a9 qemu_main_loop (qemu-system-x86_64 + 0x5961a9)
                                                #4  0x000064dd853ad1f6 qemu_default_main (qemu-system-x86_64 + 0x7b91f6)
                                                #5  0x00007cb707d2724a __libc_start_call_main (libc.so.6 + 0x2724a)
                                                #6  0x00007cb707d27305 __libc_start_main_impl (libc.so.6 + 0x27305)
                                                #7  0x000064dd84f2a621 _start (qemu-system-x86_64 + 0x336621)

                                                Stack trace of thread 6636:
                                                #0  0x00007cb707d85e96 __futex_abstimed_wait_common64 (libc.so.6 + 0x85e96)
                                                #1  0x00007cb707d88558 __pthread_cond_wait_common (libc.so.6 + 0x88558)
                                                #2  0x000064dd8555aa7b qemu_cond_wait_impl (qemu-system-x86_64 + 0x966a7b)
                                                #3  0x000064dd84f7516b vnc_worker_thread_loop (qemu-system-x86_64 + 0x38116b)
                                                #4  0x000064dd84f75e48 vnc_worker_thread (qemu-system-x86_64 + 0x381e48)
                                                #5  0x000064dd85559e88 qemu_thread_start (qemu-system-x86_64 + 0x965e88)
                                                #6  0x00007cb707d89134 start_thread (libc.so.6 + 0x89134)
                                                #7  0x00007cb707e097dc __clone3 (libc.so.6 + 0x1097dc)
                                                ELF object binary architecture: AMD x86-64
 
Last edited:
Code: 
[ 2444.210413] perf: interrupt took too long (2504 > 2500), lowering kernel.perf_event_max_sample_rate to 79000
[ 3804.152823] perf: interrupt took too long (3131 > 3130), lowering kernel.perf_event_max_sample_rate to 63000
[ 9506.519266] perf: interrupt took too long (3916 > 3913), lowering kernel.perf_event_max_sample_rate to 51000
[31218.896676] hrtimer: interrupt took 5418 ns
[54683.760199] show_signal_msg: 16 callbacks suppressed
[54683.760206] SPICE Worker[6633]: segfault at 7cb4540000a0 ip 00007cb707d94fcd sp 00007cb575dfaeb0 error 4 in libc.so.6[7cb707d26000+155000] likely on CPU 73 (core 1, socket 1)
[54683.760222] Code: 08 48 8b 4f 08 48 89 c8 48 83 e0 f8 48 3b 04 07 0f 85 a9 00 00 00 f3 0f 6f 47 10 48 8b 57 18 66 48 0f 7e c0 48 3b 78 18 75 7b <48> 3b 7a 10 75 75 48 8b 77 10 48 89 50 18 66 0f d6 42 10 48 81 f9
 
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