From: Thomas Gleixner <tglx@linutronix.de>
To: Rik van Riel <riel@surriel.com>, linux-kernel@vger.kernel.org
Cc: Dave Hansen <dave.hansen@linux.intel.com>,
Andy Lutomirski <luto@kernel.org>,
kernel-team@fb.com, Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
x86@kernel.org
Subject: Re: [PATCH] x86,mm: print likely CPU at segfault time
Date: Wed, 21 Jul 2021 22:36:07 +0200 [thread overview]
Message-ID: <87sg07pfpk.ffs@nanos.tec.linutronix.de> (raw)
In-Reply-To: <20210719150041.3c719c94@imladris.surriel.com>
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
next prev 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 [PATCH] x86,mm: print likely CPU at segfault time 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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