linux-kernel - [tip: x86/urgent] x86/traps: die() instead of panicking on a double fault

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Date:   Wed, 27 Nov 2019 08:19:29 -0000
From:   "tip-bot2 for Andy Lutomirski" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Andy Lutomirski <luto@...nel.org>, Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>, x86 <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: [tip: x86/urgent] x86/traps: die() instead of panicking on a double fault

The following commit has been merged into the x86/urgent branch of tip:

Commit-ID:     0337b7ebfcb8efb4ea0a9f2b2f284217a1c0e62d
Gitweb:        https://git.kernel.org/tip/0337b7ebfcb8efb4ea0a9f2b2f284217a1c0e62d
Author:        Andy Lutomirski <luto@...nel.org>
AuthorDate:    Mon, 25 Nov 2019 22:37:44 -08:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Tue, 26 Nov 2019 22:00:12 +01:00

x86/traps: die() instead of panicking on a double fault

A double fault has a decent chance of being recoverable by killing
the offending thread.  Use die() so that we at least try to recover.

Signed-off-by: Andy Lutomirski <luto@...nel.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/traps.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index a9b16c3..05da6b5 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -427,7 +427,7 @@ dotraplinkage void do_double_fault(struct pt_regs *regs, long error_code, unsign
 #endif
 
 	pr_emerg("PANIC: double fault, error_code: 0x%lx\n", error_code);
-	show_regs(regs);
+	die("double fault", regs, error_code);
 	panic("Machine halted.");
 }
 #endif