diff options
| -rw-r--r-- | arch/i386/kernel/crash.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/i386/kernel/crash.c b/arch/i386/kernel/crash.c index 31e077bb0ca..a021681d21f 100644 --- a/arch/i386/kernel/crash.c +++ b/arch/i386/kernel/crash.c @@ -28,6 +28,8 @@ note_buf_t crash_notes[NR_CPUS]; +/* This keeps a track of which one is crashing cpu. */ +static int crashing_cpu; static u32 *append_elf_note(u32 *buf, char *name, unsigned type, void *data, size_t data_len) @@ -113,6 +115,13 @@ static atomic_t waiting_for_crash_ipi; static int crash_nmi_callback(struct pt_regs *regs, int cpu) { struct pt_regs fixed_regs; + + /* Don't do anything if this handler is invoked on crashing cpu. + * Otherwise, system will completely hang. Crashing cpu can get + * an NMI if system was initially booted with nmi_watchdog parameter. + */ + if (cpu == crashing_cpu) + return 1; local_irq_disable(); /* CPU does not save ss and esp on stack if execution is already @@ -187,6 +196,9 @@ void machine_crash_shutdown(void) */ /* The kernel is broken so disable interrupts */ local_irq_disable(); + + /* Make a note of crashing cpu. Will be used in NMI callback.*/ + crashing_cpu = smp_processor_id(); nmi_shootdown_cpus(); lapic_shutdown(); #if defined(CONFIG_X86_IO_APIC) |