On Wed, 9 Mar 2022 at 16:16, Ard Biesheuvel <ardb@xxxxxxxxxx> wrote: > > On Wed, 9 Mar 2022 at 11:37, Russell King (Oracle) > <linux@xxxxxxxxxxxxxxx> wrote: > > > > On Wed, Mar 09, 2022 at 03:18:12PM +0530, Naresh Kamboju wrote: > > > While boting linux next-20220308 on BeagleBoard-X15 and qemu arm the following > > > kernel crash reported which is CONFIG_KASAN enabled build [1] & [2]. > > > > The unwinder is currently broken in linux-next. Please try reverting > > 532319b9c418 ("ARM: unwind: disregard unwind info before stack frame is > > set up") > > > > Yeah. > > This is the same spot Corentin hit before, where the double > dereference of vsp is not guarded by anything like > get_kernel_nofault(). We should probably fix that, but that doesn't > address the underlying issue, of course. > > I'm a bit puzzled, though, that this appears now, and didn't before. > > Naresh, I take it you did not see this occurring on earlier linux-nexts? Yes. Earlier linux-next arm boot failed due to [1], unwind: Index not found > I'll try to reproduce this, and see if I can make sense of it. In the > mean time, please do the revert Russell suggested, and if that doesn't > help, maybe try a bisect? I will try your suggestions and get back to you. - Naresh [1] https://lore.kernel.org/linux-arm-kernel/20220301220536.1302898-1-ardb@xxxxxxxxxx/T/