Re: [Qemu-devel] can we disable the migration-test for TCG targets ?

[Peter Maydell <peter.maydell@linaro.org>]

On Tue, 26 Feb 2019 at 12:17, Dr. David Alan Gilbert
<dgilbert@redhat.com> wrote:
>
> * Peter Maydell (peter.maydell@linaro.org) wrote:
> > Backtrace of process 125450:
> > Thread 6 (Thread 0xfff800012de0b900 (LWP 127434)):
> > #0  0xfff80001034c5cdc in futex_abstimed_wait_cancelable (private=0,
> > abstime=0xfff800012de09f88, expected=0, futex_word=0x10001236574)
> >     at ../sysdeps/unix/sysv/linux/futex-internal.h:205
> > #1  0xfff80001034c5cdc in do_futex_wait (sem=0x3c,
> > abstime=0xfff800012de09f88) at sem_waitcommon.c:111
> > #2  0xfff80001034c5e00 in __new_sem_wait_slow (sem=0x10001236570,
> > abstime=0xfff800012de09f88) at sem_waitcommon.c:181
> > #3  0x000001000091dacc in qemu_sem_timedwait (sem=0x10001236570,
> > ms=<optimized out>) at /home/pm215/qemu/util/qemu-thread-posix.c:289
> > #4  0x000001000078ae28 in migration_thread (opaque=0x100012364a0) at
> > /home/pm215/qemu/migration/migration.c:3125
>
> So migration is still apparently running, it's rate-limiting
> using a timedwait; but 'ms' has been unhelpfully optimised out; could
> it be stuck in here for some reason?

I looked at this from frame 4, and ms is 64. On the other
hand if I tell gdb to 'fin' it doesn't ever leave
futex_abstimed_wait_cancelable(), so I wonder if we're
managing to get the conversion of the relative time into
an absolute deadline wrong somehow ??

thanks
-- PMM