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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.bouvier@linaro.org> Message-Id: <20240812220748.95167-2-pierrick.bouvier@linaro.org> [AJB: tweak var position to meet coding style] Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20240813202329.1237572-22-alex.bennee@linaro.org> |
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| .. | ||
| api.c | ||
| core.c | ||
| loader.c | ||
| meson.build | ||
| plugin.h | ||
| qemu-plugins.symbols | ||