Re: [PATCH 8/9] virtio-gpu: fix hang under TCG when unmapping blob

["Alex Bennée" <alex.bennee@linaro.org>]

Dmitry Osipenko <dmitry.osipenko@collabora.com> writes:

> On 4/30/25 00:19, Alex Bennée wrote:
>>> This change makes QEMU to crash.
>> What is your command line to cause the crash?
>
> I applied this patch on top of native context v11, ran AMD nctx and
> got a crash on SDDM startup.

Did you also include the pre-cursor patch which splits MemoryRegion out
of the container struct. The aim here is to allow MemoryRegion counting
to be handled without worrying about other structure lifetimes.

>
> (gdb) bt
> #0  0x00007ffff5411b54 in __pthread_kill_implementation () at /lib64/libc.so.6
> #1  0x00007ffff53b8f9e in raise () at /lib64/libc.so.6
> #2  0x00007ffff53a0942 in abort () at /lib64/libc.so.6
> #3  0x00007ffff6cbf18c in g_assertion_message[cold] () at /lib64/libglib-2.0.so.0
> #4  0x00007ffff6d2ea07 in g_assertion_message_expr () at /lib64/libglib-2.0.so.0
> #5  0x0000555555a42820 in object_finalize (data=0x555557c9d290) at ../qom/object.c:732
> #6  object_unref (objptr=0x555557c9d290) at ../qom/object.c:1231
> #7  0x00005555559f3df3 in memory_region_unref (mr=<optimized out>) at ../system/memory.c:1854
> #8  0x0000555555a003a7 in phys_section_destroy (mr=0x555559ef5b60) at ../system/physmem.c:1035
> #9  phys_sections_free (map=0x555559c2dd80) at ../system/physmem.c:1048
> #10 address_space_dispatch_free (d=0x555559c2dd70) at ../system/physmem.c:2692
> #11 0x00005555559f1d33 in flatview_destroy (view=0x55555a54a720) at ../system/memory.c:295
> #12 0x0000555555c278cf in call_rcu_thread (opaque=opaque@entry=0x0) at ../util/rcu.c:301
> #13 0x0000555555c1cc68 in qemu_thread_start (args=0x555557993d30) at ../util/qemu-thread-posix.c:541
> #14 0x00007ffff540fba8 in start_thread () at /lib64/libc.so.6
> #15 0x00007ffff5493b8c in __clone3 () at /lib64/libc.so.6

-- 
Alex Bennée
Virtualisation Tech Lead @ Linaro