Set TAINT_MACHINE_CHECK when SError or Synchronous External Abort (SEA) 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@xxxxxxxxxx/ [1] Signed-off-by: Breno Leitao <leitao@xxxxxxxxxx> --- Changes in v2: - Also taint the kernel on Synchronous External Abort panics (Will Deacon) - Link to v1: https://lore.kernel.org/r/20250714-vmcore_hw_error-v1-1-8cf45edb6334@xxxxxxxxxx --- arch/arm64/kernel/traps.c | 1 + arch/arm64/mm/fault.c | 1 + 2 files changed, 2 insertions(+) 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", diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c index ec0a337891ddf..004106ff4bd03 100644 --- a/arch/arm64/mm/fault.c +++ b/arch/arm64/mm/fault.c @@ -826,6 +826,7 @@ static int do_sea(unsigned long far, unsigned long esr, struct pt_regs *regs) */ siaddr = untagged_addr(far); } + add_taint(TAINT_MACHINE_CHECK, LOCKDEP_STILL_OK); arm64_notify_die(inf->name, regs, inf->sig, inf->code, siaddr, esr); return 0; --- base-commit: d7b8f8e20813f0179d8ef519541a3527e7661d3a change-id: 20250707-vmcore_hw_error-322429e6c316 Best regards, -- Breno Leitao <leitao@xxxxxxxxxx>
