> Since this code hasn't changed in a long time, it should be possible to bisect problem.
I know the patch works, but out of curiosity I bisected it and found
that the BUG is brough out with the following commit. Seems to make
sense.
ma1c3c5eab171590f86edd8d31389d61dd1efe3037 is the first bad commit
commit 1c3c5eab171590f86edd8d31389d61dd1efe3037
Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Date: Tue May 16 20:42:48 2017 +0200
sched/core: Enable might_sleep() and smp_processor_id() checks early
might_sleep() and smp_processor_id() checks are enabled after the boot
process is done. That hides bugs in the SMP bringup and driver
initialization code.
Enable it right when the scheduler starts working, i.e. when init task and
kthreadd have been created and right before the idle task enables
preemption.
Tested-by: Mark Rutland <mark.rutland@xxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Acked-by: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Link: http://lkml.kernel.org/r/20170516184736.272225698@xxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
--
Meelis Roos (mroos@xxxxxxxx)
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