diff options
Diffstat (limited to 'kernel/watchdog.c')
| -rw-r--r-- | kernel/watchdog.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/kernel/watchdog.c b/kernel/watchdog.c index 5b62d1002783..873020a2a581 100644 --- a/kernel/watchdog.c +++ b/kernel/watchdog.c @@ -196,6 +196,15 @@ void watchdog_hardlockup_check(unsigned int cpu, struct pt_regs *regs) #ifdef CONFIG_SYSFS ++hardlockup_count; #endif + /* + * A poorly behaving BPF scheduler can trigger hard lockup by + * e.g. putting numerous affinitized tasks in a single queue and + * directing all CPUs at it. The following call can return true + * only once when sched_ext is enabled and will immediately + * abort the BPF scheduler and print out a warning message. + */ + if (scx_hardlockup(cpu)) + return; /* Only print hardlockups once. */ if (per_cpu(watchdog_hardlockup_warned, cpu)) |