| Message ID | 20201021064033.8600-1-vr_qemu@t-online.de |
|---|---|
| State | New |
| Headers | show |
| Series | qmp: fix aio_poll() assertion failure on Windows | expand |
On Wed, Oct 21, 2020 at 08:40:33AM +0200, Volker Rümelin wrote: > Commit 9ce44e2ce2 "qmp: Move dispatcher to a coroutine" modified > aio_poll() in util/aio-posix.c to avoid an assertion failure. This > change is missing in util/aio-win32.c. > > Apply the changes to util/aio-posix.c to util/aio-win32.c too. > This fixes an assertion failure on Windows whenever QEMU exits. > > $ ./qemu-system-x86_64.exe -machine pc,accel=tcg -display gtk > ** > ERROR:../qemu/util/aio-win32.c:337:aio_poll: assertion failed: > (in_aio_context_home_thread(ctx)) > Bail out! ERROR:../qemu/util/aio-win32.c:337:aio_poll: assertion > failed: (in_aio_context_home_thread(ctx)) > > Fixes: 9ce44e2ce2 ("qmp: Move dispatcher to a coroutine") > Signed-off-by: Volker Rümelin <vr_qemu@t-online.de> > --- > util/aio-win32.c | 8 +++++++- > 1 file changed, 7 insertions(+), 1 deletion(-) Thanks, applied to my block-next tree: https://gitlab.com/stefanha/qemu/commits/block-next Stefan
On 21/10/2020 07:40, Volker Rümelin wrote: > Commit 9ce44e2ce2 "qmp: Move dispatcher to a coroutine" modified > aio_poll() in util/aio-posix.c to avoid an assertion failure. This > change is missing in util/aio-win32.c. > > Apply the changes to util/aio-posix.c to util/aio-win32.c too. > This fixes an assertion failure on Windows whenever QEMU exits. > > $ ./qemu-system-x86_64.exe -machine pc,accel=tcg -display gtk > ** > ERROR:../qemu/util/aio-win32.c:337:aio_poll: assertion failed: > (in_aio_context_home_thread(ctx)) > Bail out! ERROR:../qemu/util/aio-win32.c:337:aio_poll: assertion > failed: (in_aio_context_home_thread(ctx)) > > Fixes: 9ce44e2ce2 ("qmp: Move dispatcher to a coroutine") > Signed-off-by: Volker Rümelin <vr_qemu@t-online.de> > --- > util/aio-win32.c | 8 +++++++- > 1 file changed, 7 insertions(+), 1 deletion(-) > > diff --git a/util/aio-win32.c b/util/aio-win32.c > index e7b1d649e9..168717b51b 100644 > --- a/util/aio-win32.c > +++ b/util/aio-win32.c > @@ -18,6 +18,7 @@ > #include "qemu/osdep.h" > #include "qemu-common.h" > #include "block/block.h" > +#include "qemu/main-loop.h" > #include "qemu/queue.h" > #include "qemu/sockets.h" > #include "qapi/error.h" > @@ -333,8 +334,13 @@ bool aio_poll(AioContext *ctx, bool blocking) > * There cannot be two concurrent aio_poll calls for the same AioContext (or > * an aio_poll concurrent with a GSource prepare/check/dispatch callback). > * We rely on this below to avoid slow locked accesses to ctx->notify_me. > + * > + * aio_poll() may only be called in the AioContext's thread. iohandler_ctx > + * is special in that it runs in the main thread, but that thread's context > + * is qemu_aio_context. > */ > - assert(in_aio_context_home_thread(ctx)); > + assert(in_aio_context_home_thread(ctx == iohandler_get_aio_context() ? > + qemu_get_aio_context() : ctx)); > progress = false; > > /* aio_notify can avoid the expensive event_notifier_set if Sorry about the delay, however I've just tried this on top of git master and it fixes the problem with the assert() when exiting QEMU on Win32 so: Tested-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Is it possible to get this merged for 5.2? ATB, Mark.
diff --git a/util/aio-win32.c b/util/aio-win32.c index e7b1d649e9..168717b51b 100644 --- a/util/aio-win32.c +++ b/util/aio-win32.c @@ -18,6 +18,7 @@ #include "qemu/osdep.h" #include "qemu-common.h" #include "block/block.h" +#include "qemu/main-loop.h" #include "qemu/queue.h" #include "qemu/sockets.h" #include "qapi/error.h" @@ -333,8 +334,13 @@ bool aio_poll(AioContext *ctx, bool blocking) * There cannot be two concurrent aio_poll calls for the same AioContext (or * an aio_poll concurrent with a GSource prepare/check/dispatch callback). * We rely on this below to avoid slow locked accesses to ctx->notify_me. + * + * aio_poll() may only be called in the AioContext's thread. iohandler_ctx + * is special in that it runs in the main thread, but that thread's context + * is qemu_aio_context. */ - assert(in_aio_context_home_thread(ctx)); + assert(in_aio_context_home_thread(ctx == iohandler_get_aio_context() ? + qemu_get_aio_context() : ctx)); progress = false; /* aio_notify can avoid the expensive event_notifier_set if
Commit 9ce44e2ce2 "qmp: Move dispatcher to a coroutine" modified aio_poll() in util/aio-posix.c to avoid an assertion failure. This change is missing in util/aio-win32.c. Apply the changes to util/aio-posix.c to util/aio-win32.c too. This fixes an assertion failure on Windows whenever QEMU exits. $ ./qemu-system-x86_64.exe -machine pc,accel=tcg -display gtk ** ERROR:../qemu/util/aio-win32.c:337:aio_poll: assertion failed: (in_aio_context_home_thread(ctx)) Bail out! ERROR:../qemu/util/aio-win32.c:337:aio_poll: assertion failed: (in_aio_context_home_thread(ctx)) Fixes: 9ce44e2ce2 ("qmp: Move dispatcher to a coroutine") Signed-off-by: Volker Rümelin <vr_qemu@t-online.de> --- util/aio-win32.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)