linux-kernel - Re: [Linux kernel bug] INFO: task hung in blk_mq_get

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Message-Id: <20240514224117.3191-1-hdanton@sina.com>
Date: Wed, 15 May 2024 06:41:17 +0800
From: Hillf Danton <hdanton@...a.com>
To: Sam Sun <samsun1006219@...il.com>
Cc: Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
	linux-kernel@...r.kernel.org,
	linux-block@...r.kernel.org,
	axboe@...nel.dk,
	syzkaller-bugs@...glegroups.com,
	xrivendell7@...il.com
Subject: Re: [Linux kernel bug] INFO: task hung in blk_mq_get_tag

On Tue, 14 May 2024 20:07:34 +0800 Sam Sun <samsun1006219@...il.com>
> 
> I tried to run
> 
> # echo 0 > /proc/sys/kernel/hung_task_all_cpu_backtrace
> 
> before running the reproducer, the kernel stops panic. But still, even
> if I terminate the execution of the reproducer, kernel continues
> dumping task hung logs. After setting bung_task_all_cpu_backtrace back
> to 1, it panic immediately during next dump. So I guess it is still a
> task hung instead of general protection fault.

Given kworker/u10:2:53 blocked for more than 143 seconds, or the subject
line, how could it trigger gpf?