linux-kernel - Missing CR3 switch ?

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Message-ID: <TU4PR8401MB1168028587E7EB526C332214EE690@TU4PR8401MB1168.NAMPRD84.PROD.OUTLOOK.COM>
Date:   Fri, 8 Feb 2019 08:18:50 +0000
From:   "Abraham, Santosh" <santosh.abraham@....com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Missing CR3 switch ?

Folks,

I am trying to track down a strange application segfault error 15 bug - which is resisting any attempts to be explained by an application bug.

Hypothetically, if for some reason - the KPTI code failed to switch to the user CR3 while returning back, the kernel would presumably kill the application in the first instruction that it executed in user-space.   In this case, would there be any other helpful messages in the kernel syslog other than segfault error 15, or is a completely different error message dumped ?

-santosh