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hung_task: allow hung_task_panic when hung_task_warnings is 0

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Previously hung_task_panic would not be respected if enabled after
hung_task_warnings had already been decremented to 0.

Permit the kernel to panic if hung_task_panic is enabled after
hung_task_warnings has already been decremented to 0 and another task
hangs for hung_task_timeout_secs seconds.

Check if hung_task_panic is enabled so we don't return prematurely, and
check if hung_task_warnings is non-zero so we don't print the warning
unnecessarily.

[akpm@linux-foundation.org: fix off-by-one]
Link: http://lkml.kernel.org/r/1473450214-4049-1-git-send-email-jsiddle@redhat.com
Signed-off-by: John Siddle <jsiddle@redhat.com>
Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
John Siddle 2016-10-11 13:55:56 -07:00 • committed by Linus Torvalds
parent e154ccc831
commit 48a6d64eda
1 changed files with 14 additions and 14 deletions
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28
kernel/hung_task.c
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@ -98,26 +98,26 @@ static void check_hung_task(struct task_struct *t, unsigned long timeout)
trace_sched_process_hang(t); trace_sched_process_hang(t);
if (!sysctl_hung_task_warnings) if (!sysctl_hung_task_warnings && !sysctl_hung_task_panic)
return; return;
if (sysctl_hung_task_warnings > 0)
sysctl_hung_task_warnings--;
/* /*
* Ok, the task did not get scheduled for more than 2 minutes, * Ok, the task did not get scheduled for more than 2 minutes,
* complain: * complain:
*/ */
pr_err("INFO: task %s:%d blocked for more than %ld seconds.\n", if (sysctl_hung_task_warnings) {
t->comm, t->pid, timeout); sysctl_hung_task_warnings--;
pr_err(" %s %s %.*s\n", pr_err("INFO: task %s:%d blocked for more than %ld seconds.\n",
print_tainted(), init_utsname()->release, t->comm, t->pid, timeout);
(int)strcspn(init_utsname()->version, " "), pr_err(" %s %s %.*s\n",
init_utsname()->version); print_tainted(), init_utsname()->release,
pr_err("\"echo 0 > /proc/sys/kernel/hung_task_timeout_secs\"" (int)strcspn(init_utsname()->version, " "),
" disables this message.\n"); init_utsname()->version);
sched_show_task(t); pr_err("\"echo 0 > /proc/sys/kernel/hung_task_timeout_secs\""
debug_show_all_locks(); " disables this message.\n");
sched_show_task(t);
debug_show_all_locks();
}
touch_nmi_watchdog(); touch_nmi_watchdog();