Messages in this thread | | | Date | Wed, 15 Dec 2021 09:38:53 +0000 | From | Mark Rutland <> | Subject | Re: [PATCH v4] arm64: Enable KCSAN |
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On Tue, Dec 14, 2021 at 08:11:24PM +0100, Marco Elver wrote: > On Tue, 14 Dec 2021 at 19:24, Mark Rutland <mark.rutland@arm.com> wrote: > > > > Reviewed-by: Mark Rutland <mark.rutland@arm.com> > > Tested-by: Mark Rutland <mark.rutland@arm.com> > > Thanks for taking a look and testing! Thought I'd update you re status > of some of the reports below. :-)
Thanks for the pointers below! I'll fold those into a test branch, so that I can soak this under Syzkaller over the holiday break.
I've given precise refernces below in case I've misunderstood or missed something.
> > * BUG: KCSAN: data-race in mutex_spin_on_owner+0xcc/0x150 > > * BUG: KCSAN: data-race in rwsem_spin_on_owner+0xa8/0x13c > > These are going away, fixes are already in -tip/-next.
Cool! I assume that means commits:
* c0bed69daf4b6780 ("locking: Make owner_on_cpu() into <linux/sched.h>") from https://lore.kernel.org/r/20211203075935.136808-2-wangkefeng.wang@huawei.com
* 4cf75fd4a2545ca4 ("locking: Mark racy reads of owner->on_cpu") from https://lore.kernel.org/r/20211203075935.136808-3-wangkefeng.wang@huawei.com
... in the tip locking/core branch (the head commit of which is currently 5fb6e8cf53b005d2 ("locking/atomic: atomic64: Remove unusable atomic ops")).
> > * UBSAN: object-size-mismatch in net/unix/af_unix.c:977:14 > > The UBSAN object-size-mismatch warnings are going away, as > fsanitize=object-size is broken/incomplete as it turns out -- > UBSAN_OBJECT_SIZE will be removed from 5.17: > https://bugzilla.kernel.org/show_bug.cgi?id=214861#c4
I see the relevant patch is:
* "[PATCH] ubsan: Remove CONFIG_UBSAN_OBJECT_SIZE" from https://lore.kernel.org/all/20211203235346.110809-1-keescook@chromium.org/
... and from looking at next-20211214 that's been picked up by Andrew Morton.
Thanks, Mark.
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