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Date:   Fri, 24 Nov 2017 10:14:22 +0100
From:   Ingo Molnar <>
Cc:     Dave Hansen <>,
        Andy Lutomirski <>,
        Thomas Gleixner <>,
        "H . Peter Anvin" <>,
        Peter Zijlstra <>,
        Borislav Petkov <>,
        Linus Torvalds <>
Subject: [PATCH 17/43] x86/irq/64: Print the offending IP in the stack overflow warning

From: Andy Lutomirski <>

In case something goes wrong with unwind (not unlikely in case of
overflow), print the offending IP where we detected the overflow.

Signed-off-by: Andy Lutomirski <>
Cc: Borislav Petkov <>
Cc: Borislav Petkov <>
Cc: Brian Gerst <>
Cc: Dave Hansen <>
Cc: Denys Vlasenko <>
Cc: H. Peter Anvin <>
Cc: Josh Poimboeuf <>
Cc: Linus Torvalds <>
Cc: Peter Zijlstra <>
Cc: Thomas Gleixner <>
Signed-off-by: Ingo Molnar <>
 arch/x86/kernel/irq_64.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/irq_64.c b/arch/x86/kernel/irq_64.c
index 020efbf5786b..d86e344f5b3d 100644
--- a/arch/x86/kernel/irq_64.c
+++ b/arch/x86/kernel/irq_64.c
@@ -57,10 +57,10 @@ static inline void stack_overflow_check(struct pt_regs *regs)
 	if (regs->sp >= estack_top && regs->sp <= estack_bottom)
-	WARN_ONCE(1, "do_IRQ(): %s has overflown the kernel stack (cur:%Lx,sp:%lx,irq stk top-bottom:%Lx-%Lx,exception stk top-bottom:%Lx-%Lx)\n",
+	WARN_ONCE(1, "do_IRQ(): %s has overflown the kernel stack (cur:%Lx,sp:%lx,irq stk top-bottom:%Lx-%Lx,exception stk top-bottom:%Lx-%Lx,ip:%pF)\n",
 		current->comm, curbase, regs->sp,
 		irq_stack_top, irq_stack_bottom,
-		estack_top, estack_bottom);
+		estack_top, estack_bottom, (void *)regs->ip);
 	if (sysctl_panic_on_stackoverflow)
 		panic("low stack detected by irq handler - check messages\n");

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