pid_ns: Sleep in TASK_INTERRUPTIBLE in zap_pid_ns_processes
authorEric W. Biederman <ebiederm@xmission.com>
Thu, 11 May 2017 23:21:01 +0000 (18:21 -0500)
committerEric W. Biederman <ebiederm@xmission.com>
Sat, 13 May 2017 22:26:01 +0000 (17:26 -0500)
commitb9a985db98961ae1ba0be169f19df1c567e4ffe0
treecbc07c4d6760460bea450e006a72cc9a696e2de4
parent2ea659a9ef488125eb46da6eb571de5eae5c43f6
pid_ns: Sleep in TASK_INTERRUPTIBLE in zap_pid_ns_processes

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: Vovo Yang <vovoy@google.com>
Reported-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Fixes: 6347e9009104 ("pidns: guarantee that the pidns init will be the last pidns process reaped")
Cc: stable@vger.kernel.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
kernel/pid_namespace.c