On Mon, May 19, 2014 at 10:37:11AM -0400, Vince Weaver wrote: > > When sorting through the logs of the weekend's fuzzing I found a bunch of > these errors which apparently were not fatal. > > This is a Haswell machine running 3.15-rc5 plus a number of PeterZ > patches, so sorry if the results are meaningless due to the extra patches. > I was hoping some of the fixes would show up in the mainline at some > point, running latest -git is enough of a pain, I don't really have the > cycles to be running -next or -tip kernels. > > If you look up the faulting IP it's actually happening at this line in > lockdep.c __lock_acquire() > > if (subclass < NR_LOCKDEP_CACHING_CLASSES) > class = lock->class_cache[subclass]; >
Yeah, that's a popular place to crash if you feed it garbage. Nothing lockdep can do about that. > [ 3884.569315] BUG: unable to handle kernel NULL pointer dereference at > 00000000000000b8 > [ 4014.688350] [<ffffffff810b15be>] lock_acquire+0x9e/0x120 > [ 4014.688353] [<ffffffff8164f7e0>] mutex_lock_nested+0x50/0x360 > [ 4014.688357] [<ffffffff8113b62c>] perf_event_init_context+0x8c/0x250 > [ 4014.688358] [<ffffffff8113b85d>] perf_event_init_task+0x6d/0x70 > [ 4014.688359] [<ffffffff81062165>] copy_process.part.23+0x6b5/0x1c60 > [ 4014.688362] [<ffffffff810638e5>] do_fork+0xd5/0x330 > [ 4014.688366] [<ffffffff81063bc6>] SyS_clone+0x16/0x20 > [ 4014.688367] [<ffffffff8165b999>] stub_clone+0x69/0x90 Cute, I had not seen that one yet... -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
