On Mon, 2018-01-22 at 14:00 -0800, Tejun Heo wrote: > 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 <[email protected]>
On this patch: Acked-by: Rik van Riel <[email protected]> However, it seems like we run into things like this on a fairly regular (though not very frequent) basis. Would it make sense to go through the code and add sprinkle around a few more touch_nmi_watchdog() calls? After all, there are maybe a few dozen places where we print out a lot of debugging information.
