There's the soft/hardlookup_panic sysctls, but that's a bit an extreme
measure. As a fallback taint at least the machine.
Our CI uses this to decide when a reboot is necessary, plus to figure
out whether the kernel is still happy.
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Valdis Kletnieks <valdis.kletnieks@xxxxxx>
Cc: Laurence Oberman <loberman@xxxxxxxxxx>
Cc: Vincent Whitchurch <vincent.whitchurch@xxxxxxxx>
Cc: Don Zickus <dzickus@xxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@xxxxxxxxx>
Cc: Sinan Kaya <okaya@xxxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
---
kernel/watchdog.c | 2 ++
kernel/watchdog_hld.c | 2 ++
2 files changed, 4 insertions(+)
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 6a5787233113..de7a60503517 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -469,6 +469,8 @@ static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer)
add_taint(TAINT_SOFTLOCKUP, LOCKDEP_STILL_OK);
if (softlockup_panic)
panic("softlockup: hung tasks");
+ else
+ add_taint(TAINT_WARN, LOCKDEP_STILL_OK);
__this_cpu_write(soft_watchdog_warn, true);
} else
__this_cpu_write(soft_watchdog_warn, false);
diff --git a/kernel/watchdog_hld.c b/kernel/watchdog_hld.c
index 247bf0b1582c..cce46cf75d76 100644
--- a/kernel/watchdog_hld.c
+++ b/kernel/watchdog_hld.c
@@ -154,6 +154,8 @@ static void watchdog_overflow_callback(struct perf_event *event,
if (hardlockup_panic)
nmi_panic(regs, "Hard LOCKUP");
+ else
+ add_taint(TAINT_WARN, LOCKDEP_STILL_OK);
__this_cpu_write(hard_watchdog_warn, true);
return;
--
2.20.1
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