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271c0f68b4
The current flow of canceling a thread from THREAD_ACTIVE state is:
1) Caller wants to cancel a request, so it calls thread_pool_cancel.
2) thread_pool_cancel waits on the conditional variable
elem->check_cancel.
3) The worker thread changes state to THREAD_DONE once the task is
done, and notifies elem->check_cancel to allow thread_pool_cancel
to continue execution, and signals the notifier (pool->notifier) to
allow callback function to be called later. But because of the
global mutex, the notifier won't get processed until step 4) and 5)
are done.
4) thread_pool_cancel continues, leaving the notifier signaled, it
just returns to caller.
5) Caller thinks the request is already canceled successfully, so it
releases any related data, such as freeing elem->common.opaque.
6) In the next main loop iteration, the notifier handler,
event_notifier_ready, is called. It finds the canceled thread in
THREAD_DONE state, so calls elem->common.cb, with an (likely)
dangling opaque pointer. This is a use-after-free.
Fix it by calling event_notifier_ready before leaving
thread_pool_cancel.
Test case update: This change will let cancel complete earlier than
test-thread-pool.c expects, so update the code to check this case: if
it's already done, done_cb sets .aiocb to NULL, skip calling
bdrv_aio_cancel on them.
Reported-by: Ulrich Obergfell <uobergfe@redhat.com>
Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Read the documentation in qemu-doc.html or on http://wiki.qemu-project.org - QEMU team