On Tue, 23 Aug 2016, Alexander Shishkin wrote: > Recently Vince has reported warnings and panics coming from the > general direction of AUX tracing. I found two bugs which manifest > similarly, one in intel_bts driver and one in AUX unmapping path. > > Both are triggered by racing SET_OUTPUT against mmap_close while > running AUX tracing. I have a test case that set fire to the kernel > within a few seconds by doing this, which I can share if anyone > cares.
I've applied these and am fuzzing on my Haswell machine and I'm getting lots and lots of [ 945.536374] Dazed and confused, but trying to continue [ 945.542391] Uhhuh. NMI received for unknown reason 21 on CPU 2. [ 945.549360] Do you have a strange power saving mode enabled? [ 945.556701] Dazed and confused, but trying to continue [ 945.563643] Uhhuh. NMI received for unknown reason 31 on CPU 2. [ 945.571379] Do you have a strange power saving mode enabled? [ 945.578754] Dazed and confused, but trying to continue [ 945.630889] Uhhuh. NMI received for unknown reason 31 on CPU 2. [ 945.638141] Do you have a strange power saving mode enabled? [ 945.645523] Dazed and confused, but trying to continue messages that I wasn't getting before. Of course, I updated from -rc2 to -rc3 before applying the patch so it could also be related to that too, I can try backing out the patches and see if it still happens. Vince
