GDB backtrace:
```
Thread 130 "qemu-system-x86" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fcc5a21c6c0 (LWP 2939534)]
__strcmp_evex () at ../sysdeps/x86_64/multiarch/strcmp-evex.S:320
⚠️ warning: 320 ../sysdeps/x86_64/multiarch/strcmp-evex.S: Немає такого файла
або каталогу
(gdb) bt full
#0 __strcmp_evex () at ../sysdeps/x86_64/multiarch/strcmp-evex.S:320
No locals.
#1 0x0000565050c3039b in find_fd (head=<optimized out>, name=0x0, id=0) at
migration/cpr.c:68
elem = 0x56508cb674e0
#2 cpr_delete_fd (name=0x0, id=0) at migration/cpr.c:77
elem = <optimized out>
#3 0x0000565050c0cb23 in qemu_ram_free (block=0x56508db1bba0) at
system/physmem.c:2628
name = 0x0
#4 0x0000565050c06302 in memory_region_finalize (obj=<optimized out>) at
system/memory.c:1837
mr = 0x56508d611a80
__PRETTY_FUNCTION__ = "memory_region_finalize"
#5 0x0000565050e3ce79 in object_deinit (obj=<optimized out>, type=<optimized
out>) at qom/object.c:715
No locals.
#6 object_finalize (data=0x56508d611a80) at qom/object.c:729
obj = 0x56508d611a80
ti = <optimized out>
__func__ = "object_finalize"
#7 0x0000565050c022be in memory_region_unref (mr=<optimized out>) at
system/memory.c:1869
No locals.
#8 flatview_destroy (view=0x56508e925fe0) at system/memory.c:301
i = 125
#9 0x0000565050ff9ad1 in call_rcu_thread (opaque=<optimized out>) at
util/rcu.c:324
n = 0
node = 0x56508e925fe0
#10 0x0000565050fe3fda in qemu_thread_start (args=0x56508cade5d0) at
util/qemu-thread-posix.c:393
__cancel_buf = {__cancel_jmp_buf = {{__cancel_jmp_buf =
{94903957579216, -6377961120662271408, 140515662218944, 140731801668640,
140515662220516, 140731801668903, -6377961120649688496, -845274199777588656},
__mask_was_saved = 0}}, __pad = {0x7fcc5a21b6a0, 0x0, 0x0, 0x0}}
__cancel_routine = 0x565050fe38e0 <qemu_thread_atexit_notify>
__cancel_arg = <optimized out>
__not_first_call = <optimized out>
qemu_thread_args = 0x56508cade5d0
start_routine = 0x565050ff9a10 <call_rcu_thread>
arg = 0x0
r = <optimized out>
#11 0x00007fcc5aea40da in start_thread (arg=<optimized out>) at
./nptl/pthread_create.c:454
ret = <optimized out>
pd = <optimized out>
out = <optimized out>
unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140515662218944,
-6377961120700020144, 140515662218944, 140731801668640, 0, 140731801668903,
-6377961120660174256, -6377959433024157104}, mask_was_saved = 0}}, priv = {pad
= {
0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0,
canceltype = 0}}}
not_first_call = <optimized out>
prevstate = <optimized out>
#12 0x00007fcc5af377ac in __GI___clone3 () at
../sysdeps/unix/sysv/linux/x86_64/clone3.S:78
No locals.
```
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https://bugs.launchpad.net/bugs/2156706
Title:
qemu-system-x86 crashes when `blob=true` is specified for virtio GPU
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