Commit 7f6fe97d authored by Eric W. Biederman's avatar Eric W. Biederman Committed by Ben Hutchings

pid_ns: Sleep in TASK_INTERRUPTIBLE in zap_pid_ns_processes

commit b9a985db upstream.

The code can potentially sleep for an indefinite amount of time in
zap_pid_ns_processes triggering the hung task timeout, and increasing
the system average.  This is undesirable.  Sleep with a task state of
TASK_INTERRUPTIBLE instead of TASK_UNINTERRUPTIBLE to remove these
undesirable side effects.

Apparently under heavy load this has been allowing Chrome to trigger
the hung time task timeout error and cause ChromeOS to reboot.
Reported-by: default avatarVovo Yang <vovoy@google.com>
Reported-by: default avatarGuenter Roeck <linux@roeck-us.net>
Tested-by: default avatarGuenter Roeck <linux@roeck-us.net>
Fixes: 6347e900 ("pidns: guarantee that the pidns init will be the last pidns process reaped")
Signed-off-by: default avatar"Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
parent afa719ed
......@@ -234,7 +234,7 @@ void zap_pid_ns_processes(struct pid_namespace *pid_ns)
* Make sure they all go away, see free_pid().
*/
for (;;) {
set_current_state(TASK_UNINTERRUPTIBLE);
set_current_state(TASK_INTERRUPTIBLE);
if (pid_ns->nr_hashed == init_pids)
break;
schedule();
......
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