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| author | Eric W. Biederman <ebiederm@xmission.com> | 2017-05-11 18:21:01 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-05-25 15:44:38 +0200 |
| commit | 6dc6a2700b6a0dd755027654b85bd614d8d3d52b (patch) | |
| tree | 637bb98f54820cae1cb2a4a91df8ed9262edb0a9 | |
| parent | 5e40ac3fbd0d733bf32447b44f50ca32efb05e20 (diff) | |
| download | linux-stable-6dc6a2700b6a0dd755027654b85bd614d8d3d52b.tar.gz linux-stable-6dc6a2700b6a0dd755027654b85bd614d8d3d52b.tar.bz2 linux-stable-6dc6a2700b6a0dd755027654b85bd614d8d3d52b.zip | |
pid_ns: Sleep in TASK_INTERRUPTIBLE in zap_pid_ns_processes
commit b9a985db98961ae1ba0be169f19df1c567e4ffe0 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: 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")
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | kernel/pid_namespace.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c index eef2ce968636..3976dd57db78 100644 --- a/kernel/pid_namespace.c +++ b/kernel/pid_namespace.c @@ -274,7 +274,7 @@ void zap_pid_ns_processes(struct pid_namespace *pid_ns) * if reparented. */ for (;;) { - set_current_state(TASK_UNINTERRUPTIBLE); + set_current_state(TASK_INTERRUPTIBLE); if (pid_ns->nr_hashed == init_pids) break; schedule(); |