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From: Thomas Gleixner <>
To: Rik van Riel <>,
Cc: Dave Hansen <>,
	Andy Lutomirski <>,, Peter Zijlstra <>,
	Ingo Molnar <>, Borislav Petkov <>,
Subject: Re: [PATCH] x86,mm: print likely CPU at segfault time
Date: Wed, 21 Jul 2021 22:36:07 +0200	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>


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().



  parent reply	other threads:[~2021-07-21 20:36 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-19 19:00 Rik van Riel
2021-07-19 19:20 ` Dave Hansen
2021-07-19 19:34   ` Rik van Riel
2021-07-21 20:38     ` Thomas Gleixner
2021-07-21 20:36 ` Thomas Gleixner [this message]
2021-07-24  1:38   ` Rik van Riel
2022-08-02 20:09 Rik van Riel
2022-08-03 14:49 ` Dave Hansen

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