Re: [Qemu-devel] Freeze / spin in virtio blk...flatview do translate

[Frank Yang]

That seems to be the case, since our 15 second detector is reset if the
main loop runs its timers again, so no main loop iterations happened since
that aio_dispatch_handlers call (we use a looper abstraction for it).

On Tue, Sep 18, 2018 at 8:56 AM Paolo Bonzini <address@hidden> wrote:

> On 15/09/2018 20:41, Frank Yang via Qemu-devel wrote:
> > We have not reproduced this hang so far, this is from user crash reports
> > that triggered our hang detector (where 15+ seconds pass without main
> loop
> > / VCPU threads being able to go back and ping their loopers in main loop
> /
> > vcpu threads.
> >
> > 0x00000001024e9fcb(qemu-system-x86_64 -exec.c:511)flatview_translate
> > 0x00000001024f2390(qemu-system-x86_64
> > -memory.h:1865)address_space_lduw_internal_cached
> > 0x000000010246ff11(qemu-system-x86_64
> > -virtio-access.h:166)virtio_queue_set_notification
> > 0x00000001024fa2c9(qemu-system-x86_64+ 0x000a72c9)virtio_blk_handle_vq
> > 0x00000001024746ee(qemu-system-x86_64
> > -virtio.c:1521)virtio_queue_host_notifier_aio_read
> > 0x0000000103a5ed8a(qemu-system-x86_64
> -aio-posix.c:406)aio_dispatch_handlers
> > 0x0000000103a5ecc8(qemu-system-x86_64 -aio-posix.c:437)aio_dispatch
> > 0x0000000103a5c158(qemu-system-x86_64 -async.c:261)aio_ctx_dispatch
> > 0x0000000103a92103(qemu-system-x86_64
> -gmain.c:3072)g_main_context_dispatch
> > 0x0000000103a5e4ad(qemu-system-x86_64 -main-loop.c:224)main_loop_wait
> > 0x0000000102468ab8(qemu-system-x86_64 -vl.c:2172)main_impl
> > 0x0000000102461a3a(qemu-system-x86_64 -vl.c:3332)run_qemu_main
> > 0x000000010246eef3(qemu-system-x86_64
> > -main.cpp:577)enter_qemu_main_loop(int, char**)
> > 0x00000001062b63a9(libQt5Core.5.dylib
> > -qthread_unix.cpp:344)QThreadPrivate::start(void*)
> > 0x00007fff65118660
> > 0x00007fff6511850c
> > 0x00007fff65117bf8
> > 0x00000001062b623f(libQt5Core.5.dylib+ 0x0002623f)
>
> To be clear, is aio_dispatch_handlers running for 15+ seconds?
>
> None of the patches you point out are related however.
>
> Paolo
>