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Re: [Qemu-devel] s390x failure: "tcg_handle_interrupt: assertion failed:
From: |
Alex Bennée |
Subject: |
Re: [Qemu-devel] s390x failure: "tcg_handle_interrupt: assertion failed: (qemu_mutex_iothread_locked())" |
Date: |
Wed, 01 Mar 2017 18:35:13 +0000 |
User-agent: |
mu4e 0.9.19; emacs 25.2.7 |
Thomas Huth <address@hidden> writes:
> On 01.03.2017 12:36, Alex Bennée wrote:
>>
>> Peter Maydell <address@hidden> writes:
>>
>>> I got a make check failure on aarch64 host running a sparc64 test:
>>>
>>>
>>> TEST: tests/prom-env-test... (pid=13573)
>>> /sparc64/prom-env/sun4u: **
>>> ERROR:/home/pm215/qemu/translate-common.c:34:tcg_handle_interrupt:
>>> assertion failed: (qemu_mutex_iothread_locked())
>>
>> So the assertions where added with MTTCG. The design specifies which
>> bits should be protected by the BQL and cpu->interrupt_request is one of
>> them. This is because cpu->interrupt_request is often a cross-vCPU
>> action (one vCPU triggering an interrupt on another) so there is a
>> chance of racing if not protected.
>>
>> It's odd this is showing up on a aarch64 host though when it didn't hit
>> on my x86_64 host while testing.
>>
>> As most of this stuff is triggered by hardware emulation the BQL should
>> be in effect when handling MMIO for device emulation. There where other
>> entry points in ARM which could trigger stuff which is why we add
>> locking for things like ARM_CP_IO which are co-processor register
>> accesses which trigger other things in the system.
>>
>> What will be useful for all these reports is the backtrace. Then it's
>> fairly simple to identify the thing triggering the interrupt and
>> identify the correct place for the locking.
>
> Here are the backtraces from the s390x moon buggy image:
>
> Thread 3 (Thread 0x7fffdc608700 (LWP 14468)):
> #0 0x00007ffff18ef1d7 in raise () at /lib64/libc.so.6
> #1 0x00007ffff18f08c8 in abort () at /lib64/libc.so.6
> #2 0x00007ffff2f642a5 in g_assertion_message () at /lib64/libglib-2.0.so.0
> #3 0x00007ffff2f6433a in g_assertion_message_expr () at
> /lib64/libglib-2.0.so.0
> #4 0x000055555560bd31 in tcg_handle_interrupt (cpu=0x55555612fc40, mask=2)
> at /home/thuth/devel/qemu/translate-common.c:34
> #5 0x000055555568fe03 in css_do_ssch (address@hidden, address@hidden)
> at /home/thuth/devel/qemu/hw/s390x/css.c:945
> #6 0x00005555556b99ad in ioinst_handle_ssch (cpu=0x55555612fc40,
> reg1=<optimized out>, ipb=<optimized out>)
> at /home/thuth/devel/qemu/target/s390x/ioinst.c:238
Already fixed in my tree ;-)
https://github.com/stsquad/qemu/tree/mttcg/post-merge-fixes-v2
with:
https://github.com/stsquad/qemu/commit/24b0b124c58682e33f11ce2d3d53924e92d8745f
> #7 0x00007fffe60957be in code_gen_buffer ()
> #8 0x000055555560b49d in cpu_exec (itb=<optimized out>, itb=<optimized out>,
> cpu=0x7fffe52dc790)
> at /home/thuth/devel/qemu/cpu-exec.c:165
> #9 0x000055555560b49d in cpu_exec (sc=0x7fffdc6079b0, tb_exit=<synthetic
> pointer>, last_tb=<synthetic pointer>, tb=<optimized out>,
> cpu=0x7fffe52dc790) at /home/thuth/devel/qemu/cpu-exec.c:584
> #10 0x000055555560b49d in cpu_exec (address@hidden) at
> /home/thuth/devel/qemu/cpu-exec.c:686
> #11 0x000055555563677a in tcg_cpu_exec (cpu=0x55555612fc40) at
> /home/thuth/devel/qemu/cpus.c:1251
> #12 0x0000555555636ab4 in qemu_tcg_rr_cpu_thread_fn (arg=<optimized out>) at
> /home/thuth/devel/qemu/cpus.c:1347
> #13 0x00007ffff53b3dc5 in start_thread () at /lib64/libpthread.so.0
> #14 0x00007ffff19b173d in clone () at /lib64/libc.so.6
>
> Thread 2 (Thread 0x7fffe82b5700 (LWP 14467)):
> #0 0x00007ffff19abbf9 in syscall () at /lib64/libc.so.6
> #1 0x0000555555853896 in qemu_event_wait (val=<optimized out>, f=<optimized
> out>)
> at /home/thuth/devel/qemu/include/qemu/futex.h:26
> #2 0x0000555555853896 in qemu_event_wait (address@hidden
> <rcu_call_ready_event>)
> at /home/thuth/devel/qemu/util/qemu-thread-posix.c:399
> #3 0x000055555586243e in call_rcu_thread (opaque=<optimized out>) at
> /home/thuth/devel/qemu/util/rcu.c:249
> #4 0x00007ffff53b3dc5 in start_thread () at /lib64/libpthread.so.0
> #5 0x00007ffff19b173d in clone () at /lib64/libc.so.6
>
> Thread 1 (Thread 0x7ffff7f91c00 (LWP 14463)):
> #0 0x00007ffff19a6ebf in ppoll () at /lib64/libc.so.6
> #1 0x000055555584f819 in qemu_poll_ns (__ss=0x0, __timeout=0x7fffffffda20,
> __nfds=<optimized out>, __fds=<optimized out>)
> at /usr/include/bits/poll2.h:77
> #2 0x000055555584f819 in qemu_poll_ns (fds=<optimized out>, nfds=<optimized
> out>, address@hidden)
> at /home/thuth/devel/qemu/util/qemu-timer.c:333
> #3 0x00005555558505e8 in main_loop_wait (timeout=9897590) at
> /home/thuth/devel/qemu/util/main-loop.c:254
> #4 0x00005555558505e8 in main_loop_wait (nonblocking=<optimized out>) at
> /home/thuth/devel/qemu/util/main-loop.c:508
> #5 0x00005555555f83b9 in main () at /home/thuth/devel/qemu/vl.c:1897
> #6 0x00005555555f83b9 in main (argc=<optimized out>, argv=<optimized out>,
> envp=<optimized out>)
> at /home/thuth/devel/qemu/vl.c:4675
>
> HTH2,
> Thomas
--
Alex Bennée
- Re: [Qemu-devel] intermittent make check failure: "tcg_handle_interrupt: assertion failed: (qemu_mutex_iothread_locked())", (continued)
- Re: [Qemu-devel] intermittent make check failure: "tcg_handle_interrupt: assertion failed: (qemu_mutex_iothread_locked())", Mark Cave-Ayland, 2017/03/01
- Re: [Qemu-devel] intermittent make check failure: "tcg_handle_interrupt: assertion failed: (qemu_mutex_iothread_locked())", Alex Bennée, 2017/03/01
- Re: [Qemu-devel] intermittent make check failure: "tcg_handle_interrupt: assertion failed: (qemu_mutex_iothread_locked())", Mark Cave-Ayland, 2017/03/01
- Re: [Qemu-devel] intermittent make check failure: "tcg_handle_interrupt: assertion failed: (qemu_mutex_iothread_locked())", Alex Bennée, 2017/03/01
- Re: [Qemu-devel] intermittent make check failure: "tcg_handle_interrupt: assertion failed: (qemu_mutex_iothread_locked())", Mark Cave-Ayland, 2017/03/01
- Re: [Qemu-devel] intermittent make check failure: "tcg_handle_interrupt: assertion failed: (qemu_mutex_iothread_locked())", Alex Bennée, 2017/03/01
- Re: [Qemu-devel] intermittent make check failure: "tcg_handle_interrupt: assertion failed: (qemu_mutex_iothread_locked())", Peter Maydell, 2017/03/01
- Re: [Qemu-devel] intermittent make check failure: "tcg_handle_interrupt: assertion failed: (qemu_mutex_iothread_locked())", Thomas Huth, 2017/03/01
Re: [Qemu-devel] intermittent make check failure: "tcg_handle_interrupt: assertion failed: (qemu_mutex_iothread_locked())", Peter Maydell, 2017/03/01
Re: [Qemu-devel] s390x failure: "tcg_handle_interrupt: assertion failed: (qemu_mutex_iothread_locked())", Thomas Huth, 2017/03/01
- Re: [Qemu-devel] s390x failure: "tcg_handle_interrupt: assertion failed: (qemu_mutex_iothread_locked())",
Alex Bennée <=
Re: [Qemu-devel] xtensa failure: "tcg_handle_interrupt: assertion failed: (qemu_mutex_iothread_locked())", Thomas Huth, 2017/03/01
Re: [Qemu-devel] mips failure: "tcg_handle_interrupt: assertion failed: (qemu_mutex_iothread_locked())", Yongbok Kim, 2017/03/02
Re: [Qemu-devel] mips failure: "tcg_handle_interrupt: assertion failed: (qemu_mutex_iothread_locked())", Alex Bennée, 2017/03/02