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main-loop: Acquire main_context lock around os_host_main_loop_wait.

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When running virt-rescue the serial console hangs from time to time.
Virt-rescue runs an ordinary Linux kernel "appliance", but there is
only a single idle process running inside, so the qemu main loop is
largely idle.  With virt-rescue >= 1.37 you may be able to observe the
hang by doing:

  $ virt-rescue -e ^] --scratch
  ><rescue> while true; do ls -l /usr/bin; done

The hang in virt-rescue can be resolved by pressing a key on the
serial console.

Possibly with the same root cause, we also observed hangs during very
early boot of regular Linux VMs with a serial console.  Those hangs
are extremely rare, but you may be able to observe them by running
this command on baremetal for a sufficiently long time:

  $ while libguestfs-test-tool -t 60 >& /tmp/log ; do echo -n . ; done

(Check in /tmp/log that the failure was caused by a hang during early
boot, and not some other reason)

During investigation of this bug, Paolo Bonzini wrote:

> glib is expecting QEMU to use g_main_context_acquire around accesses to
> GMainContext.  However QEMU is not doing that, instead it is taking its
> own mutex.  So we should add g_main_context_acquire and
> g_main_context_release in the two implementations of
> os_host_main_loop_wait; these should undo the effect of Frediano's
> glib patch.

This patch exactly implements Paolo's suggestion in that paragraph.

This fixes the serial console hang in my testing, across 3 different
physical machines (AMD, Intel Core i7 and Intel Xeon), over many hours
of automated testing.  I wasn't able to reproduce the early boot hangs
(but as noted above, these are extremely rare in any case).

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1435432
Reported-by: Richard W.M. Jones <rjones@redhat.com>
Tested-by: Richard W.M. Jones <rjones@redhat.com>
Signed-off-by: Richard W.M. Jones <rjones@redhat.com>
Message-Id: <20170331205133.23906-1-rjones@redhat.com>
[Paolo: this is actually a glib bug: recent glib versions are also
expecting g_main_context_acquire around g_poll---but that is not
documented and probably not even intended].
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Richard W.M. Jones 2017-03-31 21:51:33 +01:00 committed by Paolo Bonzini
parent 90c4fe5fc5
commit ecbddbb106
1 changed files with 11 additions and 0 deletions
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11
util/main-loop.c
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@ -218,9 +218,12 @@ static void glib_pollfds_poll(void)
static int os_host_main_loop_wait(int64_t timeout)
{
GMainContext *context = g_main_context_default();
int ret;
static int spin_counter;
g_main_context_acquire(context);
glib_pollfds_fill(&timeout);
/* If the I/O thread is very busy or we are incorrectly busy waiting in
@ -256,6 +259,9 @@ static int os_host_main_loop_wait(int64_t timeout)
}
glib_pollfds_poll();
g_main_context_release(context);
return ret;
}
#else
@ -412,12 +418,15 @@ static int os_host_main_loop_wait(int64_t timeout)
fd_set rfds, wfds, xfds;
int nfds;
g_main_context_acquire(context);
/* XXX: need to suppress polling by better using win32 events */
ret = 0;
for (pe = first_polling_entry; pe != NULL; pe = pe->next) {
ret |= pe->func(pe->opaque);
}
if (ret != 0) {
g_main_context_release(context);
return ret;
}
@ -472,6 +481,8 @@ static int os_host_main_loop_wait(int64_t timeout)
g_main_context_dispatch(context);
}
g_main_context_release(context);
return select_ret || g_poll_ret;
}
#endif