raise_mce() fiddles with global state, but lacks any kind of serialization. Add a mutex around the raise_mce() call, so concurrent writers do not stomp on each other toes. Signed-off-by: Thomas Gleixner --- arch/x86/kernel/cpu/mcheck/mce-inject.c | 4 ++++ 1 file changed, 4 insertions(+) Index: tip/arch/x86/kernel/cpu/mcheck/mce-inject.c =================================================================== --- tip.orig/arch/x86/kernel/cpu/mcheck/mce-inject.c +++ tip/arch/x86/kernel/cpu/mcheck/mce-inject.c @@ -78,6 +78,7 @@ static void raise_exception(struct mce * } static cpumask_var_t mce_inject_cpumask; +static DEFINE_MUTEX(mce_inject_mutex); static int mce_raise_notify(unsigned int cmd, struct pt_regs *regs) { @@ -229,7 +230,10 @@ static ssize_t mce_write(struct file *fi * so do it a jiffie or two later everywhere. */ schedule_timeout(2); + + mutex_lock(&mce_inject_mutex); raise_mce(&m); + mutex_unlock(&mce_inject_mutex); return usize; } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/