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Re: [Qemu-devel] [PATCH] chardev: race condition with tcp_chr_disconnect
From: |
Andrey Shinkevich |
Subject: |
Re: [Qemu-devel] [PATCH] chardev: race condition with tcp_chr_disconnect |
Date: |
Wed, 17 Jul 2019 08:28:19 +0000 |
On 15/07/2019 21:27, Paolo Bonzini wrote:
> On 15/07/19 19:23, Max Reitz wrote:
>> On 12.07.19 21:17, Andrey Shinkevich wrote:
>>> When tcp_chr_disconnect() is called, other thread may be still writing
>>> to the channel. This patch protects only read operations that initiate
>>> the disconnection.
>>>
>>> Signed-off-by: Andrey Shinkevich <address@hidden>
>>> ---
>>
>> Have you looked at
>> https://lists.nongnu.org/archive/html/qemu-devel/2019-02/msg06174.html
>> already? From a glance, it looks like that series supersedes this one.
>>
>> (No, I don’t know why the other series is delayed.
>
> Because it broke some testcases in tests/vhost-user-test. They are
> disabled by default, because AFAIR they broke on some CI environment,
> but they are supposed to work.
>
> Paolo
>
>> I keep reminding
>> Paolo of it.)
>>
>> Max
>>
>
The test check-qtest-x86_64: tests/qos-test hangs with the
QTEST_VHOST_USER_FIXME set even without applying the series:
Thread 4 (Thread 0x2ade7a2bb700 (LWP 492566)):
#0 0x00002ade6f5431c9 in syscall () at
../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1 0x00005599dec08bb6 in qemu_futex_wait (f=0x5599df6651d4
<rcu_call_ready_event>, val=4294967295) at
/home/andrey/git/qemu/include/qemu/futex.h:29
#2 0x00005599dec08d7f in qemu_event_wait (ev=0x5599df6651d4
<rcu_call_ready_event>) at util/qemu-thread-posix.c:442
#3 0x00005599dec21ea1 in call_rcu_thread (opaque=0x0) at util/rcu.c:260
#4 0x00005599dec08f2c in qemu_thread_start (args=0x5599e10568f0) at
util/qemu-thread-posix.c:502
#5 0x00002ade6f236dd5 in start_thread (arg=0x2ade7a2bb700) at
pthread_create.c:307
#6 0x00002ade6f548ead in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:111
Thread 3 (Thread 0x2ade7a4bc700 (LWP 492567)):
#0 0x00002ade6f53e20d in poll () at ../sysdeps/unix/syscall-template.S:81
#1 0x00002ade56e7c32c in g_main_context_iterate.isra.19 () at
/lib64/libglib-2.0.so.0
#2 0x00002ade56e7c67a in g_main_loop_run () at /lib64/libglib-2.0.so.0
#3 0x00005599de7f6772 in iothread_run (opaque=0x5599e1196a30) at
iothread.c:82
#4 0x00005599dec08f2c in qemu_thread_start (args=0x5599e11a87a0) at
util/qemu-thread-posix.c:502
#5 0x00002ade6f236dd5 in start_thread (arg=0x2ade7a4bc700) at
pthread_create.c:307
#6 0x00002ade6f548ead in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:111
Thread 2 (Thread 0x2ade7a7ae700 (LWP 492568)):
#0 0x00002ade6f23e361 in __sigwait (sig=0x2ade7a7ab750, set=<optimized
out>) at ../sysdeps/unix/sysv/linux/sigwait.c:60
#1 0x00002ade6f23e361 in __sigwait (set=0x2ade7a7ab760,
sig=0x2ade7a7ab750) at ../sysdeps/unix/sysv/linux/sigwait.c:95
#2 0x00005599de655fee in qemu_dummy_cpu_thread_fn (arg=0x5599e11a9eb0)
at /home/andrey/git/qemu/cpus.c:1331
#3 0x00005599dec08f2c in qemu_thread_start (args=0x5599e11cd140) at
util/qemu-thread-posix.c:502
#4 0x00002ade6f236dd5 in start_thread (arg=0x2ade7a7ae700) at
pthread_create.c:307
#5 0x00002ade6f548ead in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:111
Thread 1 (Thread 0x2ade5661c280 (LWP 492564)):
#0 0x00002ade6f53e2cf in __GI_ppoll (fds=0x5599e20e1360, nfds=9,
timeout=<optimized out>, sigmask=0x0) at
../sysdeps/unix/sysv/linux/ppoll.c:56
#1 0x00005599dec0232d in qemu_poll_ns (fds=0x5599e20e1360, nfds=9,
timeout=43793998964000) at util/qemu-timer.c:334
#2 0x00005599dec03510 in os_host_main_loop_wait
(timeout=43793998964000) at util/main-loop.c:240
#3 0x00005599dec03634 in main_loop_wait (nonblocking=0) at
util/main-loop.c:521
#4 0x00005599de7ff439 in main_loop () at vl.c:1791
#5 0x00005599de806dca in main (argc=19, argv=0x7ffe5b3b66a8,
envp=0x7ffe5b3b6748) at vl.c:4473
Andrey
--
With the best regards,
Andrey Shinkevich