Re: 8b275b3754 ("x86/irq/64: Remap the IRQ stack with guard pages"): BUG: unable to handle kernel paging request at ffffb659000a1000

2019-04-07 Thread Andy Lutomirski
> On Apr 7, 2019, at 2:23 AM, Thomas Gleixner wrote: > >> On Sat, 6 Apr 2019, Andy Lutomirski wrote: >> I haven't spotted the actual bug yet, but the faulting instruction is: >> >> 2a:65 8b 35 09 ca 75 63 mov%gs:*0x6375ca09(%rip),%esi >># 0x6375ca3a<-- trapping

Re: 8b275b3754 ("x86/irq/64: Remap the IRQ stack with guard pages"): BUG: unable to handle kernel paging request at ffffb659000a1000

2019-04-07 Thread Thomas Gleixner
On Sat, 6 Apr 2019, Andy Lutomirski wrote: > I haven't spotted the actual bug yet, but the faulting instruction is: > > 2a:65 8b 35 09 ca 75 63 mov%gs:*0x6375ca09(%rip),%esi > # 0x6375ca3a<-- trapping instruction > > This seems to be faulting just above the top of the

Re: 8b275b3754 ("x86/irq/64: Remap the IRQ stack with guard pages"): BUG: unable to handle kernel paging request at ffffb659000a1000

2019-04-06 Thread Andy Lutomirski
On Sat, Apr 6, 2019 at 6:54 AM Andy Lutomirski wrote: > > On Fri, Apr 5, 2019 at 11:38 PM kernel test robot wrote: > > > > Greetings, > > > > 0day kernel testing robot got the below dmesg and the first bad commit is > > > > https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git > >

Re: 8b275b3754 ("x86/irq/64: Remap the IRQ stack with guard pages"): BUG: unable to handle kernel paging request at ffffb659000a1000

2019-04-06 Thread Andy Lutomirski
On Fri, Apr 5, 2019 at 11:38 PM kernel test robot wrote: > > Greetings, > > 0day kernel testing robot got the below dmesg and the first bad commit is > > https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git > WIP.x86/stackguards > > commit 8b275b3754465d502d393f8ae8dd355b7067e73f >