I think there is a bug in kmod.c. In __call_usermodehelper(), when
kernel_thread(wait_for_helper, ...) return success, since
wait_for_helper() might call complete() at any time, the sub_info should
not be used any more.
the following patch is made in 2.6.17.7
--- kmod.c 2006-07-25 11:36:01.000000000 +0800
+++ /tmp/kmod.c 2006-08-02 01:01:42.702054000 +0800
@@ -198,6 +198,7 @@ static void __call_usermodehelper(void *
{
struct subprocess_info *sub_info = data;
pid_t pid;
+ int wait = sub_info->wait;
/* CLONE_VFORK: wait until the usermode helper has execve'd
* successfully We need the data structures to stay around
@@ -212,7 +213,7 @@ static void __call_usermodehelper(void *
if (pid < 0) {
sub_info->retval = pid;
complete(sub_info->complete);
- } else if (!sub_info->wait)
+ } else if (!wait)
complete(sub_info->complete);
}
--
-
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