Messages in this thread |  | | Date | Fri, 5 Jun 2020 12:56:14 +0200 | From | Peter Zijlstra <> | Subject | Re: BUG: kernel NULL pointer dereference from check_preempt_wakeup() |
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On Fri, Jun 05, 2020 at 12:38:59PM +0200, Peter Zijlstra wrote: > On Thu, Jun 04, 2020 at 03:54:45PM -0700, Paul E. McKenney wrote: > > Hello! > > > > I get the splat below at a rate of roughly two per thirty hours when > > running rcutorture scenario TREE03 on x86 at the June 3rd mainline commit: > > > > cb8e59cc8720 ("Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next") > > > > Running 140 hours of this same scenario at the following June 2nd mainline > > commit shows no errors: > > > > d9afbb350990 ("Merge branch 'next-general' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security") > > > > I have started a bisection, but it is likely to take several days to > > complete. I am looking at ways of speeding this up, but in the meantime, > > I figured that I should check to see if others are also encountering this. > > > > Thoughts? > > I think this shows there's a boo-boo with the IPI patches. I've not > managed to reproduce, but I'll give them another hard look. > > Would you have a .config for me? My compiler's check_preempt_wakeup > isn't anywhere near 0x180 bytes long. I'm thiknig you have > instrumentation enabled, KCSAN?
n/m, I was looking at the wrong function.. let me go puzzle.
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