linux-kernel - Re: about seg fault inside rseq critical section

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Message-ID: <723248518.60240.1617801901472.JavaMail.zimbra@efficios.com>
Date:   Wed, 7 Apr 2021 09:25:01 -0400 (EDT)
From:   Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:     Mingyi Liu <mingyiliu@...ech.edu>
Cc:     linux-kernel <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        paulmck <paulmck@...nel.org>, Boqun Feng <boqun.feng@...il.com>
Subject: Re: about seg fault inside rseq critical section

(re-sent in plain-text for lkml)

----- On Apr 6, 2021, at 6:24 PM, Mingyi Liu mingyiliu@...ech.edu wrote:

> Hi Mathieu,

> I notice that the program will be terminated with segmentation fault when it is
> even seg faulted inside the rseq critical section. In Linux kernel rseq.c, I
> haven't found comment or code regarding this. Could you share any references on
> why it doesn't execute user defined abort handler but uses the OS handler
> instead?

> Thanks in advance!

Hi Mingyi, 

Please let me add the other rseq maintainers and LKML in CC. I'm a bit stretched on time 
here, so maybe they will have time to answer before I do. 

Meanwhile, if you could provide details about your architecture, kernel .config, and a 
small reproducer program, it would help bootstrapping the discussion. 

Thanks, 

Mathieu 

> Best,

> Mingyi

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com