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[Bug 1863023] Re: Deadlock in QXL
From: |
Thomas Huth |
Subject: |
[Bug 1863023] Re: Deadlock in QXL |
Date: |
Wed, 05 May 2021 15:16:31 -0000 |
The QEMU project is currently considering to move its bug tracking to
another system. For this we need to know which bugs are still valid
and which could be closed already. Thus we are setting older bugs to
"Incomplete" now.
If you still think this bug report here is valid, then please switch
the state back to "New" within the next 60 days, otherwise this report
will be marked as "Expired". Or please mark it as "Fix Released" if
the problem has been solved with a newer version of QEMU already.
Thank you and sorry for the inconvenience.
** Changed in: qemu
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1863023
Title:
Deadlock in QXL
Status in QEMU:
Incomplete
Bug description:
This is on qemu 4.2.0 OSX host, running fresh Windows 7 with SPICE
guest tools just installed.
Command line: `qemu-system-x86_64 -qmp
tcp:localhost:4444,server,nowait -smp cpus=2 -boot order=d -m 2048
-soundhw hda -drive file=hda.img,if=ide,media=disk -spice
port=5930,addr=127.0.0.1,disable-ticketing,image-compression=off
,playback-compression=off,streaming-video=off -vga qxl -device
rtl8139,netdev=net0 -netdev user,id=net0`
After the Windows logo, the screen is black. I dump the two vCPU
threads:
```
* thread #16
* frame #0: 0x00007fff523b8ce6 libsystem_kernel.dylib`__psynch_cvwait + 10
frame #1: 0x00007fff52467185 libsystem_pthread.dylib`_pthread_cond_wait +
701
frame #2: 0x0000000110bf88bd
qemu-system-x86_64`qemu_cond_wait_impl(cond=0x000000011121e8d0,
mutex=0x000000011120ba48, file="cpus-common.c", line=144) at
qemu-thread-posix.c:173:11 [opt]
frame #3: 0x0000000110926a59
qemu-system-x86_64`do_run_on_cpu(cpu=<unavailable>, func=<unavailable>,
data=<unavailable>, mutex=0x000000011120ba48) at cpus-common.c:144:9 [opt]
frame #4: 0x000000011080c50a
qemu-system-x86_64`memory_region_snapshot_and_clear_dirty at memory.c:2595:5
[opt]
frame #5: 0x000000011080c4d7
qemu-system-x86_64`memory_region_snapshot_and_clear_dirty(mr=<unavailable>,
addr=0, size=2359296, client=<unavailable>) at memory.c:2107 [opt]
frame #6: 0x0000000110849fe1 qemu-system-x86_64`vga_update_display
[inlined] vga_draw_graphic(s=<unavailable>, full_update=0) at vga.c:1661:16
[opt]
frame #7: 0x000000011084996a
qemu-system-x86_64`vga_update_display(opaque=<unavailable>) at vga.c:1785 [opt]
frame #8: 0x00000001109b261d
qemu-system-x86_64`qxl_hard_reset(d=0x00007f84f8730000, loadvm=0) at
qxl.c:1285:5 [opt]
frame #9: 0x000000011080ac97
qemu-system-x86_64`memory_region_write_accessor(mr=0x00007f84f8741fb0, addr=5,
value=<unavailable>, size=1, shift=<unavailable>, mask=<unavailable>,
attrs=MemTxAttrs @ 0x000070000786d890) at memory.c:483:5 [opt]
frame #10: 0x000000011080ab31
qemu-system-x86_64`memory_region_dispatch_write [inlined]
access_with_adjusted_size(addr=<unavailable>, value=0x00000000015c6100,
size=<unavailable>, access_size_min=<unavailable>,
access_size_max=<unavailable>, access_fn=<unavailable>, mr=<unavailable>,
attrs=<unavailable>) at memory.c:544:18 [opt]
frame #11: 0x000000011080aafd
qemu-system-x86_64`memory_region_dispatch_write(mr=<unavailable>,
addr=<unavailable>, data=22831360, op=32644, attrs=MemTxAttrs @
0x000070000786d8c0) at memory.c:1475 [opt]
frame #12: 0x00000001107b080d
qemu-system-x86_64`address_space_stb(as=<unavailable>, addr=<unavailable>,
val=22831360, attrs=MemTxAttrs @ r12, result=0x0000000000000000) at
memory_ldst.inc.c:378:13 [opt]
frame #13: 0x0000000118570230
* thread #18
* frame #0: 0x00007fff523b8ce6 libsystem_kernel.dylib`__psynch_cvwait + 10
frame #1: 0x00007fff52467185 libsystem_pthread.dylib`_pthread_cond_wait +
701
frame #2: 0x0000000110bf88bd
qemu-system-x86_64`qemu_cond_wait_impl(cond=0x000000011121e860,
mutex=0x000000011121e818, file="cpus-common.c", line=196) at
qemu-thread-posix.c:173:11 [opt]
frame #3: 0x0000000110926c44 qemu-system-x86_64`start_exclusive at
cpus-common.c:196:9 [opt]
frame #4: 0x0000000110837c35
qemu-system-x86_64`cpu_exec_step_atomic(cpu=0x00007f8518290000) at
cpu-exec.c:265:9 [opt]
frame #5: 0x00000001107fcf95
qemu-system-x86_64`qemu_tcg_cpu_thread_fn(arg=0x00007f8518290000) at
cpus.c:1799:17 [opt]
frame #6: 0x0000000110bf911e
qemu-system-x86_64`qemu_thread_start(args=<unavailable>) at
qemu-thread-posix.c:519:9 [opt]
frame #7: 0x00007fff52466e65 libsystem_pthread.dylib`_pthread_start + 148
frame #8: 0x00007fff5246283b libsystem_pthread.dylib`thread_start + 15
```
Seems like thread #16 had a STB to QXL MMIO registers which caused it
to call `qxl_hard_reset` and eventually made its way to
`do_run_on_cpu` which waits for `qemu_work_cond`. The only way
`qemu_work_cond` is set is if one of the two vCPU executes the queued
work at the end of the TCG execution. Thread #16 is stuck waiting, so
what about thread #18? Thread #18 is waiting for `exclusive_cond`
which is set once all the other CPUs are done running (but thread #16
is waiting still). So classic deadlock.
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