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-rw-r--r--accel/tcg/tcg-accel-ops-icount.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/accel/tcg/tcg-accel-ops-icount.c b/accel/tcg/tcg-accel-ops-icount.c
index 8f1dda4344..84cc7421be 100644
--- a/accel/tcg/tcg-accel-ops-icount.c
+++ b/accel/tcg/tcg-accel-ops-icount.c
@@ -109,7 +109,13 @@ void icount_prepare_for_run(CPUState *cpu)
     replay_mutex_lock();
 
     if (cpu->icount_budget == 0) {
+        /*
+         * We're called without the iothread lock, so must take it while
+         * we're calling timer handlers.
+         */
+        qemu_mutex_lock_iothread();
         icount_notify_aio_contexts();
+        qemu_mutex_unlock_iothread();
     }
 }