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locking/lockdep: Avoid triggering hardlockup from debug_show_all_locks()
debug_show_all_locks() iterates all tasks and print held locks whole holding tasklist_lock. This can take a while on a slow console device and may end up triggering NMI hardlockup detector if someone else ends up waiting for tasklist_lock. Touch the NMI watchdog while printing the held locks to avoid spuriously triggering the hardlockup detector. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: kernel-team@fb.com Link: http://lkml.kernel.org/r/20180122220055.GB1771050@devbig577.frc2.facebook.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -49,6 +49,7 @@
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#include <linux/gfp.h>
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#include <linux/random.h>
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#include <linux/jhash.h>
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#include <linux/nmi.h>
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#include <asm/sections.h>
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@ -4490,6 +4491,7 @@ void debug_show_all_locks(void)
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if (!unlock)
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if (read_trylock(&tasklist_lock))
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unlock = 1;
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touch_nmi_watchdog();
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} while_each_thread(g, p);
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pr_warn("\n");
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