linux-kernel - [PATCH] x86/traps: Print unhashed pointers on stack overflow

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Message-ID: <20251224070735.454816-1-ryasuoka@redhat.com>
Date: Wed, 24 Dec 2025 16:07:32 +0900
From: Ryosuke Yasuoka <ryasuoka@...hat.com>
To: tglx@...utronix.de,
	mingo@...hat.com,
	bp@...en8.de,
	dave.hansen@...ux.intel.com,
	hpa@...or.com
Cc: Ryosuke Yasuoka <ryasuoka@...hat.com>,
	x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] x86/traps: Print unhashed pointers on stack overflow

When a stack overflow occurs, the kernel prints hashed fault address and
the stack range using %p. The actual addresses are required for
debugging and hashed pointers provide no useful information in this
context.

Use %px to print the unhashed, raw addresses.

Signed-off-by: Ryosuke Yasuoka <ryasuoka@...hat.com>
---
 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 bcf1dedc1d00..5a6a772e0a6c 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -549,7 +549,7 @@ __visible void __noreturn handle_stack_overflow(struct pt_regs *regs,
 {
 	const char *name = stack_type_name(info->type);
 
-	printk(KERN_EMERG "BUG: %s stack guard page was hit at %p (stack is %p..%p)\n",
+	printk(KERN_EMERG "BUG: %s stack guard page was hit at %px (stack is %px..%px)\n",
 	       name, (void *)fault_address, info->begin, info->end);
 
 	die("stack guard page", regs, 0);

base-commit: b927546677c876e26eba308550207c2ddf812a43
-- 
2.52.0