diff options
| author | Oleg Nesterov <[email protected]> | 2007-05-23 13:57:27 -0700 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2007-05-23 20:14:11 -0700 |
| commit | a076e4bca2fdabb9e45d86722cc72c0944da5f94 (patch) | |
| tree | b11684f4b39dabb84584773f1b7811b5207e7f01 /kernel | |
| parent | 49b12d4f5e274517b8bc032d507abf31cc2f4150 (diff) | |
freezer: fix kthread_create vs freezer theoretical race
kthread() sleeps in TASK_INTERRUPTIBLE state waiting for the first wakeup. In
theory, this wakeup may come from freeze_process()->signal_wake_up(), so the
task can disappear even before kthread_create() sets its ->comm.
Change kthread() to use TASK_UNINTERRUPTIBLE.
[[email protected]: s/BUG_ON/WARN_ON+recover]
Signed-off-by: Oleg Nesterov <[email protected]>
Acked-by: "Eric W. Biederman" <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
Cc: Gautham R Shenoy <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/kthread.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/kernel/kthread.c b/kernel/kthread.c index df8a8e8f6ca4..bbd51b81a3e8 100644 --- a/kernel/kthread.c +++ b/kernel/kthread.c @@ -70,7 +70,7 @@ static int kthread(void *_create) data = create->data; /* OK, tell user we're spawned, wait for stop or wakeup */ - __set_current_state(TASK_INTERRUPTIBLE); + __set_current_state(TASK_UNINTERRUPTIBLE); complete(&create->started); schedule(); @@ -162,7 +162,10 @@ EXPORT_SYMBOL(kthread_create); */ void kthread_bind(struct task_struct *k, unsigned int cpu) { - BUG_ON(k->state != TASK_INTERRUPTIBLE); + if (k->state != TASK_UNINTERRUPTIBLE) { + WARN_ON(1); + return; + } /* Must have done schedule() in kthread() before we set_task_cpu */ wait_task_inactive(k); set_task_cpu(k, cpu); |