linux-kernel - [PATCH] arm64: traps: Mark kernel as tainted on SError panic

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Message-Id: <20250710-arm_serror-v1-1-2a3def3740d7@debian.org>
Date: Thu, 10 Jul 2025 03:46:35 -0700
From: Breno Leitao <leitao@...ian.org>
To: Catalin Marinas <catalin.marinas@....com>, 
 Will Deacon <will@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 kernel-team@...a.com, osandov@...com, leo.yan@....com, rmikey@...a.com, 
 Breno Leitao <leitao@...ian.org>
Subject: [PATCH] arm64: traps: Mark kernel as tainted on SError panic

Set TAINT_MACHINE_CHECK when SError interrupts trigger a panic to
flag potential hardware faults. This tainting mechanism aids in
debugging and enables correlation of hardware-related crashes in
large-scale deployments.

This change aligns with similar patches[1] that mark machine check
events when the system crashes due to hardware errors.

Link: https://lore.kernel.org/all/20250702-add_tain-v1-1-9187b10914b9@debian.org/ [1]
Signed-off-by: Breno Leitao <leitao@...ian.org>
---
 arch/arm64/kernel/traps.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
index 9bfa5c944379d..7468b22585cef 100644
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@@ -931,6 +931,7 @@ void __noreturn panic_bad_stack(struct pt_regs *regs, unsigned long esr, unsigne
 
 void __noreturn arm64_serror_panic(struct pt_regs *regs, unsigned long esr)
 {
+	add_taint(TAINT_MACHINE_CHECK, LOCKDEP_STILL_OK);
 	console_verbose();
 
 	pr_crit("SError Interrupt on CPU%d, code 0x%016lx -- %s\n",

---
base-commit: 8c2e52ebbe885c7eeaabd3b7ddcdc1246fc400d2
change-id: 20250710-arm_serror-77fca8d732d4

Best regards,
--  
Breno Leitao <leitao@...ian.org>