diff options
Diffstat (limited to 'debian/patches-rt/0098-panic-Flush-kernel-log-buffer-at-the-end.patch')
| -rw-r--r-- | debian/patches-rt/0098-panic-Flush-kernel-log-buffer-at-the-end.patch | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/debian/patches-rt/0098-panic-Flush-kernel-log-buffer-at-the-end.patch b/debian/patches-rt/0098-panic-Flush-kernel-log-buffer-at-the-end.patch new file mode 100644 index 0000000000..ec3cbc5dd2 --- /dev/null +++ b/debian/patches-rt/0098-panic-Flush-kernel-log-buffer-at-the-end.patch @@ -0,0 +1,38 @@ +From: John Ogness <john.ogness@linutronix.de> +Date: Thu, 14 Dec 2023 20:48:23 +0000 +Subject: [PATCH 098/134] panic: Flush kernel log buffer at the end +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/6.6/older/patches-6.6.7-rt18.tar.xz + +If the kernel crashes in a context where printk() calls always +defer printing (such as in NMI or inside a printk_safe section) +then the final panic messages will be deferred to irq_work. But +if irq_work is not available, the messages will not get printed +unless explicitly flushed. The result is that the final +"end Kernel panic" banner does not get printed. + +Add one final flush after the last printk() call to make sure +the final panic messages make it out as well. + +Signed-off-by: John Ogness <john.ogness@linutronix.de> +Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +--- + kernel/panic.c | 8 ++++++++ + 1 file changed, 8 insertions(+) + +--- a/kernel/panic.c ++++ b/kernel/panic.c +@@ -442,6 +442,14 @@ void panic(const char *fmt, ...) + + /* Do not scroll important messages printed above */ + suppress_printk = 1; ++ ++ /* ++ * The final messages may not have been printed if in a context that ++ * defers printing (such as NMI) and irq_work is not available. ++ * Explicitly flush the kernel log buffer one last time. ++ */ ++ console_flush_on_panic(CONSOLE_FLUSH_PENDING); ++ + local_irq_enable(); + for (i = 0; ; i += PANIC_TIMER_STEP) { + touch_softlockup_watchdog(); |