@@ -123,15 +123,19 @@ void early_printk(const char *s, ...) { }
#endif
#ifdef CONFIG_PRINTK_NMI
+#define deferred_console_in_nmi() in_nmi()
extern void printk_nmi_init(void);
extern void printk_nmi_enter(void);
extern void printk_nmi_exit(void);
extern void printk_nmi_flush(void);
+extern void printk_nmi_flush_on_panic(void);
#else
+#define deferred_console_in_nmi() 0
static inline void printk_nmi_init(void) { }
static inline void printk_nmi_enter(void) { }
static inline void printk_nmi_exit(void) { }
static inline void printk_nmi_flush(void) { }
+static inline void printk_nmi_flush_on_panic(void) { }
#endif /* PRINTK_NMI */
#ifdef CONFIG_PRINTK
@@ -893,6 +893,7 @@ void crash_kexec(struct pt_regs *regs)
old_cpu = atomic_cmpxchg(&panic_cpu, PANIC_CPU_INVALID, this_cpu);
if (old_cpu == PANIC_CPU_INVALID) {
/* This is the 1st CPU which comes here, so go ahead. */
+ printk_nmi_flush_on_panic();
__crash_kexec(regs);
/*
@@ -160,8 +160,10 @@ void panic(const char *fmt, ...)
*
* Bypass the panic_cpu check and call __crash_kexec directly.
*/
- if (!crash_kexec_post_notifiers)
+ if (!crash_kexec_post_notifiers) {
+ printk_nmi_flush_on_panic();
__crash_kexec(NULL);
+ }
/*
* Note smp_send_stop is the usual smp shutdown function, which
@@ -176,6 +178,8 @@ void panic(const char *fmt, ...)
*/
atomic_notifier_call_chain(&panic_notifier_list, 0, buf);
+ /* Call flush even twice. It tries harder with a single online CPU */
+ printk_nmi_flush_on_panic();
kmsg_dump(KMSG_DUMP_PANIC);
/*
@@ -22,6 +22,8 @@ int __printf(1, 0) vprintk_default(const char *fmt, va_list args);
#ifdef CONFIG_PRINTK_NMI
+extern raw_spinlock_t logbuf_lock;
+
/*
* printk() could not take logbuf_lock in NMI context. Instead,
* it temporary stores the strings into a per-CPU buffer.
@@ -194,6 +194,41 @@ void printk_nmi_flush(void)
__printk_nmi_flush(&per_cpu(nmi_print_seq, cpu).work);
}
+/**
+ * printk_nmi_flush_on_panic - flush all per-cpu nmi buffers when the system
+ * goes down.
+ *
+ * Similar to printk_nmi_flush() but it can be called even in NMI context when
+ * the system goes down. It does the best effort to get NMI messages into
+ * the main ring buffer.
+ *
+ * Note that it could try harder when there is only one CPU online.
+ */
+void printk_nmi_flush_on_panic(void)
+{
+ if (in_nmi()) {
+ /*
+ * Make sure that we could access the main ring buffer.
+ * Do not risk a double release when more CPUs are up.
+ */
+ if (raw_spin_is_locked(&logbuf_lock)) {
+ if (num_online_cpus() > 1)
+ return;
+
+ debug_locks_off();
+ raw_spin_lock_init(&logbuf_lock);
+ }
+
+ /*
+ * Flush the messages using the default printk handler
+ * to store them into the main ring buffer.
+ */
+ this_cpu_write(printk_func, vprintk_default);
+ }
+
+ printk_nmi_flush();
+}
+
void __init printk_nmi_init(void)
{
int cpu;
@@ -245,7 +245,7 @@ __packed __aligned(4)
* within the scheduler's rq lock. It must be released before calling
* console_unlock() or anything else that might wake up a process.
*/
-static DEFINE_RAW_SPINLOCK(logbuf_lock);
+DEFINE_RAW_SPINLOCK(logbuf_lock);
#ifdef CONFIG_PRINTK
DECLARE_WAIT_QUEUE_HEAD(log_wait);
@@ -1764,8 +1764,16 @@ asmlinkage int vprintk_emit(int facility, int level,
lockdep_on();
local_irq_restore(flags);
- /* If called from the scheduler, we can not call up(). */
- if (!in_sched) {
+ /*
+ * Console calls must be deferred when called from the scheduler.
+ *
+ * Many architectures never call vprintk_emit() in NMI context,
+ * see vprintk_nmi(). The only exception is when the NMI buffers
+ * are flushed on panic. In this case, the consoles are called
+ * later explicitly only when crashdump does not work, see
+ * console_flush_on_panic().
+ */
+ if (!in_sched && !deferred_console_in_nmi()) {
lockdep_off();
/*
* Try to acquire and then immediately release the console
In NMI context, printk() messages are stored into per-CPU buffers to avoid a possible deadlock. They are normally flushed to the main ring buffer via an IRQ work. But the work is never called when the system calls panic() in the very same NMI handler. This patch tries to flush NMI buffers before the crash dump is generated. In this case it does not risk a double release and bails out when the logbuf_lock is already taken. The aim is to get the messages into the main ring buffer when possible. It makes them better accessible in the vmcore. Then the patch tries to flush the buffers second time when other CPUs are down. It might be more aggressive and reset logbuf_lock. The aim is to get the messages available for the consequent kmsg_dump() and console_flush_on_panic() calls. The patch causes vprintk_emit() to be called even in NMI context again. But we do not want to call consoles in this case. They might use internal locks and we could not prevent a deadlock easily. We only want to have the messages in the main ring buffer for crash dump and kmsg_dump(). The consoles are explicitly called later by console_flush_on_panic(). Signed-off-by: Petr Mladek <pmladek@suse.com> --- include/linux/printk.h | 4 ++++ kernel/kexec_core.c | 1 + kernel/panic.c | 6 +++++- kernel/printk/internal.h | 2 ++ kernel/printk/nmi.c | 35 +++++++++++++++++++++++++++++++++++ kernel/printk/printk.c | 14 +++++++++++--- 6 files changed, 58 insertions(+), 4 deletions(-)