when hardlockup_all_cpu_backtrace is on, and there are a large number of cores in the system, it takes a long time to output the hard deadlock logs of all cores to the serial port. When the console_flush_on_panic function in panic is executed, console_locked is still held. As a result, garbled characters are displayed in the serial port log.
To solve this problem, wait for a maximum of 10s for the serial port to be released before console_flush_on_panic. Signed-off-by: Xu Qiang <[email protected]> --- kernel/panic.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/kernel/panic.c b/kernel/panic.c index 332736a72a58..0014788e8141 100644 --- a/kernel/panic.c +++ b/kernel/panic.c @@ -301,6 +301,14 @@ void panic(const char *fmt, ...) * panic() is not being callled from OOPS. */ debug_locks_off(); + + /* Wait for all CPUs to complete console_unlock */ + for (i = 0; i < 10 * 1000; i++) { + if (console_trylock()) + break; + mdelay(1); + } + console_flush_on_panic(CONSOLE_FLUSH_PENDING); panic_print_sys_info(); -- 2.25.0
