Messages in this thread | | | From | Thomas Gleixner <> | Subject | Re: [PATCH] x86,mm: print likely CPU at segfault time | Date | Wed, 21 Jul 2021 22:36:07 +0200 |
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Rik,
On Mon, Jul 19 2021 at 15:00, Rik van Riel wrote: > > Adding a printk to show_signal_msg() achieves that purpose. It isn't > perfect since the task might get rescheduled on another CPU between > when the fault hit and when the message is printed, but it should be > good enough to show correlation between userspace and kernel errors > when dealing with a bad CPU.
we could collect the cpu number in do_*_addr_fault() before interrupts are enabled and just hand it through. There are only a few callchains which end up in __bad_area_nosemaphore().
Thanks,
tglx
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