Messages in this thread | | | Subject | Re: [PATCH -next] panic: complete the flush of the hard deadlock log messages to the serial port | From | "xuqiang (M)" <> | Date | Tue, 24 Nov 2020 11:22:11 +0800 |
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在 2020/11/24 3:52, Andrew Morton 写道: > On Mon, 23 Nov 2020 13:13:59 +0000 Xu Qiang <xuqiang36@huawei.com> wrote: > >> 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. > Wouldn't it be better to wait until all the printing of all those > backtraces has completed? > > > .
The fear that there may be some unexpected abnormal situation,
resulting in the serial port has been occupied without release.
Thanks
Xu.
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