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Date: Mon, 13 Jun 2022 17:11:46 +0200 From: Petr Mladek <pmladek@...e.com> To: John Ogness <john.ogness@...utronix.de> Cc: Peter Geis <pgwipeout@...il.com>, Sergey Senozhatsky <senozhatsky@...omium.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org> Subject: Re: [BUG] Threaded printk breaks early debugging On Mon 2022-06-13 04:29:50, John Ogness wrote: > On 2022-06-12, Peter Geis <pgwipeout@...il.com> wrote: > > The buffer isn't an issue here, everything is available in dmesg when > > userspace becomes available. Instead some messages bound for the > > serial console are never output. > > OK. Good to know. > > > We run a serial console at 1.5m baud which is significantly higher > > than most SoCs which default to 115200. I have noticed some timing > > differences since the introduction of the threaded console. A > > significant amount of information is dumped very early in the boot > > process (between 0 and 4 seconds into boot), as most drivers are > > probing during this time. It also happens to be when the earlycon > > console hands over to the normal console. There is no abnormal > > debugging enabled, the output is a standard (non-quiet) boot log. The > > question is why is direct mode not triggering during a panic? > > Just to be clear, you are not losing any intermediate messages. Only the > tail end of the kernel log was never printed. Is this correct? > > This may be the same issue being discussed here [0]. > > John Ogness > > [0] https://lore.kernel.org/all/87v8t5l39z.fsf@jogness.linutronix.de If the last messages are missing then it is most likely the same issue. Peter, could you please try if the patch at https://lore.kernel.org/r/YqdSw/fJvnkRbjvc@alley would make any difference? Best Regards, Petr
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