Pierrick Bouvier <pierrick.bouv...@linaro.org> writes: > A deadlock can be created if a new vcpu (a) triggers a scoreboard > reallocation, and another vcpu (b) wants to create a new scoreboard at > the same time. > > In this case, (a) holds the plugin lock, and starts an exclusive > section, waiting for (b). But at the same time, (b) is waiting for > plugin lock. > > The solution is to drop the lock before entering the exclusive section. > > This bug can be easily reproduced by creating a callback for any tb > exec, that allocates a new scoreboard. In this case, as soon as we reach > more than 16 vcpus, the deadlock occurs. > > Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2344 > Signed-off-by: Pierrick Bouvier <pierrick.bouv...@linaro.org>
Queued to maintainer/for-9.1, thanks. -- Alex Bennée Virtualisation Tech Lead @ Linaro
