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[Qemu-devel] [PULL 04/43] cpus.c: qemu_mutex_lock_iothread fix race cond


From: Paolo Bonzini
Subject: [Qemu-devel] [PULL 04/43] cpus.c: qemu_mutex_lock_iothread fix race condition at cpu thread init
Date: Wed, 9 Sep 2015 15:49:34 +0200

From: Aníbal Limón <address@hidden>

When QEMU starts the RCU thread executes qemu_mutex_lock_thread
causing error "qemu:qemu_cpu_kick_thread: No such process" and exits.

This isn't occur frequently but in glibc the thread id can exist and
this not guarantee that the thread is on active/running state. If is
inserted a sleep(1) after newthread assignment [1] the issue appears.

So not make assumption that thread exist if first_cpu->thread is set
then change the validation of cpu to created that is set into cpu
threads (kvm, tcg, dummy).

[1] 
https://sourceware.org/git/?p=glibc.git;a=blob;f=nptl/pthread_create.c;h=d10f4ea8004e1d8f3a268b95cc0f8d93b8d89867;hb=HEAD#l621

Cc: address@hidden
Signed-off-by: Aníbal Limón <address@hidden>
Message-Id: <address@hidden>
Signed-off-by: Paolo Bonzini <address@hidden>
---
 cpus.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cpus.c b/cpus.c
index c1e74d9..e831aa3 100644
--- a/cpus.c
+++ b/cpus.c
@@ -1166,7 +1166,7 @@ void qemu_mutex_lock_iothread(void)
      * TCG code execution.
      */
     if (!tcg_enabled() || qemu_in_vcpu_thread() ||
-        !first_cpu || !first_cpu->thread) {
+        !first_cpu || !first_cpu->created) {
         qemu_mutex_lock(&qemu_global_mutex);
         atomic_dec(&iothread_requesting_mutex);
     } else {
-- 
2.4.3





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