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Re: [Qemu-devel] [PULL for-2.4 0/4] Block patches


From: Peter Maydell
Subject: Re: [Qemu-devel] [PULL for-2.4 0/4] Block patches
Date: Tue, 21 Jul 2015 10:04:03 +0100

On 20 July 2015 at 19:05, Stefan Hajnoczi <address@hidden> wrote:
> The following changes since commit f73ca7363440240b7ee5ee7f7ddb1c64751efb54:
>
>   Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into staging 
> (2015-07-20 13:25:28 +0100)
>
> are available in the git repository at:
>
>   git://github.com/stefanha/qemu.git tags/block-pull-request
>
> for you to fetch changes up to 4fefb0d50cd0a803bba3cedaeb9adfb80cc61fed:
>
>   AioContext: fix broken ctx->dispatching optimization (2015-07-20 17:14:22 
> +0100)
>
> ----------------------------------------------------------------
>
> ----------------------------------------------------------------
>
> Fam Zheng (1):
>   mirror: Speed up bitmap initial scanning
>
> Paolo Bonzini (3):
>   tests: remove irrelevant assertions from test-aio
>   aio-win32: reorganize polling loop
>   AioContext: fix broken ctx->dispatching optimization

I'm afraid this seems to cause 'make check' to hang on one
of the PPC tests:

QTEST_QEMU_BINARY=ppc-softmmu/qemu-system-ppc QTEST_QEMU_IMG=qemu-img
MALLOC_PERTURB_=${MALLOC_PERTURB_:-$((RANDOM % 255 + 1))} gtester -k
--verbose -m=quick tests/endianness-test tests/boot-order-test
tests/qom-test
TEST: tests/endianness-test... (pid=27216)
  /ppc/endianness/g3beige:                                             OK
  /ppc/endianness/split/g3beige:                                       OK
  /ppc/endianness/combine/g3beige:                                     OK
  /ppc/endianness/prep:                                                OK
  /ppc/endianness/split/prep:                                          OK
  /ppc/endianness/combine/prep:                                        OK
  /ppc/endianness/bamboo:                                              OK
  /ppc/endianness/split/bamboo:                                        OK
  /ppc/endianness/combine/bamboo:                                      OK
PASS: tests/endianness-test
TEST: tests/boot-order-test... (pid=27228)
  /ppc/boot-order/prep:                                                OK
  /ppc/boot-order/pmac_oldworld:

(and then it just sits there. Seen on x86-64/Linux and OSX hosts.)

Backtrace from connecting a gdb to it:
(gdb) thread apply all bt

Thread 3 (Thread 0x2ac8d2d5f700 (LWP 17911)):
#0  __lll_lock_wait () at
../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:135
#1  0x00002ac8c6310657 in _L_lock_909 () from
/lib/x86_64-linux-gnu/libpthread.so.0
#2  0x00002ac8c6310480 in __GI___pthread_mutex_lock
(mutex=0x2ac8be8dad00 <qemu_global_mutex>) at
../nptl/pthread_mutex_lock.c:79
#3  0x00002ac8be3a9f89 in qemu_mutex_lock
(address@hidden <qemu_global_mutex>) at
/home/petmay01/linaro/qemu-for-merges/util/qemu-thread-posix.c:73
#4  0x00002ac8be0554a4 in qemu_mutex_lock_iothread () at
/home/petmay01/linaro/qemu-for-merges/cpus.c:1164
#5  0x00002ac8be3ba33e in call_rcu_thread (opaque=<optimised out>) at
/home/petmay01/linaro/qemu-for-merges/util/rcu.c:241
#6  0x00002ac8c630e182 in start_thread (arg=0x2ac8d2d5f700) at
pthread_create.c:312
#7  0x00002ac8c661e47d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 2 (Thread 0x2ac8d33ac700 (LWP 17912)):
#0  0x00002ac8c63160d1 in do_sigwait (sig=0x2ac8d33ab99c,
set=<optimised out>) at
../nptl/sysdeps/unix/sysv/linux/../../../../../sysdeps/unix/sysv/linux/sigwait.c:60
#1  __sigwait (address@hidden,
address@hidden) at
../nptl/sysdeps/unix/sysv/linux/../../../../../sysdeps/unix/sysv/linux/sigwait.c:97
#2  0x00002ac8be055937 in qemu_dummy_cpu_thread_fn
(arg=0x2ac8bed53450) at
/home/petmay01/linaro/qemu-for-merges/cpus.c:1016
#3  0x00002ac8c630e182 in start_thread (arg=0x2ac8d33ac700) at
pthread_create.c:312
#4  0x00002ac8c661e47d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 1 (Thread 0x2ac8be572680 (LWP 17910)):
#0  syscall () at ../sysdeps/unix/sysv/linux/x86_64/syscall.S:38
#1  0x00002ac8be3aa5f2 in futex_wait (val=4294967295,
ev=0x2ac8be669708) at
/home/petmay01/linaro/qemu-for-merges/util/qemu-thread-posix.c:301
#2  qemu_event_wait (address@hidden) at
/home/petmay01/linaro/qemu-for-merges/util/qemu-thread-posix.c:399
#3  0x00002ac8be325e41 in qemu_clock_enable
(address@hidden, address@hidden) at
/home/petmay01/linaro/qemu-for-merges/qemu-timer.c:167
#4  0x00002ac8be055d22 in pause_all_vcpus () at
/home/petmay01/linaro/qemu-for-merges/cpus.c:1200
#5  0x00002ac8be01491d in main_loop_should_exit () at
/home/petmay01/linaro/qemu-for-merges/vl.c:1864
#6  main_loop () at /home/petmay01/linaro/qemu-for-merges/vl.c:1906
#7  main (argc=<optimised out>, argv=<optimised out>, envp=<optimised
out>) at /home/petmay01/linaro/qemu-for-merges/vl.c:4653

thanks
-- PMM



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