From: Steven Rostedt <rostedt@goodmis.org>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>,
Nadav Amit <nadav.amit@gmail.com>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: [BUG] GPF on reboot of box
Date: Fri, 6 Oct 2017 21:39:56 -0400 [thread overview]
Message-ID: <20171006213956.0b33cf61@gandalf.local.home> (raw)
Starting with v4.14-rc1 my box crashes during a reboot. All I get is
the following:
[ 250.615793] sd 0:0:0:0: [sda] Synchronizing SCSI cache
[ 250.635639] reboot: Restarting system
[ 250.639671] reboot: machine restart
[ 250.643842] general protection fault: 0000 [#1] PREEMPT SMP KASAN
Then nothing. No reboot, it just hangs there.
I bisected it down to this commit:
660da7c9228f ("x86/mm: Enable CR4.PCIDE on supported systems")
If I comment out the setting of X86_CR4_PCIDE in that commit, it boots
fine. But...
I noticed that commit c7ad5ad29 ("x86/mm/64: Initialize CR4.PCIDE
early") moved the problem code from arch/x86/kernel/cpu/common.c to
arch/x86/mm/init.c
If I comment it out in v4.14-rc1, it crashes on boot up.
It appears that my box doesn't like having X86_CR4_PCIDE set. it causes
reboot to fail. But it also appears that setting that is required for
some other code to work.
Help!
-- Steve
next reply other threads:[~2017-10-07 1:40 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-07 1:39 Steven Rostedt [this message]
2017-10-07 2:21 ` Nadav Amit
2017-10-07 3:13 ` Steven Rostedt
2017-10-07 13:36 ` Steven Rostedt
2017-10-07 22:49 ` Andy Lutomirski
2017-10-08 18:59 ` Steven Rostedt
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