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From: Michal Hocko <mhocko@suse.com>
To: 陈冠有 <chenguanyou9338@gmail.com>
Cc: Randy Dunlap <rdunlap@infradead.org>,
	linux-kernel@vger.kernel.org, akpm@linux-foundation.org,
	Kees Cook <keescook@chromium.org>,
	lukas.bulwahn@gmail.com, vbabka@suse.cz, gpiccoli@canonical.com,
	chenguanyou <chenguanyou@xiaomi.com>
Subject: Re: [PATCH] hungtask: add filter kthread/check comm
Date: Fri, 21 May 2021 10:31:50 +0200	[thread overview]
Message-ID: <YKdv9hmRh+VxJrnH@dhcp22.suse.cz> (raw)
In-Reply-To: <CAHS3RMVYbHTzD6JnOmE331qSbcnvuYnBe0jraNuuLc0Z2NnStg@mail.gmail.com>

On Fri 21-05-21 14:38:06, 陈冠有 wrote:
> when we no skip kthread, exp log:
> 3,25164,832483138,-; (1)[67:khungtaskd]INFO: task amms_task:51 blocked for
> more than 120 seconds.
> 3,25165,832483169,-; (1)[67:khungtaskd]      Tainted: P S      W  O
>  4.14.186-g9d5f2ff-dirty #4
> 3,25166,832483186,-; (1)[67:khungtaskd]"echo 0 >
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> 6,25167,832483205,-; (1)[67:khungtaskd]amms_task       D    0    51      2
> 0x00000000
> 4,25168,832483232,-; (1)[67:khungtaskd]Call trace:
> 4,25169,832483268,-; (1)[67:khungtaskd] __switch_to+0x134/0x150
> 4,25170,832483297,-; (1)[67:khungtaskd] __schedule+0xd5c/0x1100
> 4,25171,832483318,-; (1)[67:khungtaskd] schedule+0x70/0x90
> 4,25172,832483343,-; (1)[67:khungtaskd] kthread+0xfc/0x18c
> 4,25173,832483365,-; (1)[67:khungtaskd] ret_from_fork+0x10/0x18
> 3,25174,832483482,-; (1)[67:khungtaskd]INFO: task mdrt_thread:123 blocked
> for more than 120 seconds.
> 3,25175,832483501,-; (1)[67:khungtaskd]      Tainted: P S      W  O
>  4.14.186-g9d5f2ff-dirty #4
> 3,25176,832483516,-; (1)[67:khungtaskd]"echo 0 >
> /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> 6,25177,832483533,-; (1)[67:khungtaskd]mdrt_thread     D    0   123      2
> 0x00000000
> 4,25178,832483555,-; (1)[67:khungtaskd]Call trace:
> 4,25179,832483574,-; (1)[67:khungtaskd] __switch_to+0x134/0x150
> 4,25180,832483595,-; (1)[67:khungtaskd] __schedule+0xd5c/0x1100
> 4,25181,832483615,-; (1)[67:khungtaskd] schedule+0x70/0x90
> 4,25182,832483635,-; (1)[67:khungtaskd] kthread+0xfc/0x18c
> 4,25183,832483655,-; (1)[67:khungtaskd] ret_from_fork+0x10/0x18
> 3,25184,832483737,-; (1)[67:khungtaskd]INFO: task scp_power_reset:227
> blocked for more than 120 seconds.

What are all these kernel threads doing and why it is ok to inhibit them
in the report.
-- 
Michal Hocko
SUSE Labs

  parent reply	other threads:[~2021-05-21  8:31 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-19 12:13 [PATCH] hungtask: add filter kthread/check comm chenguanyou
2021-05-19 13:06 ` Michal Hocko
2021-05-19 17:53 ` Randy Dunlap
     [not found]   ` <CAHS3RMVYbHTzD6JnOmE331qSbcnvuYnBe0jraNuuLc0Z2NnStg@mail.gmail.com>
2021-05-21  8:31     ` Michal Hocko [this message]
  -- strict thread matches above, loose matches on Subject: below --
2021-05-21 13:25 chenguanyou
2021-05-22 21:51 ` Andrew Morton
     [not found]   ` <CAHS3RMWjuB98TzvcYyQ0qtNYOxDeM7W1YmyqDYs=H-cn-VsVdw@mail.gmail.com>
2021-05-25  7:26     ` Michal Hocko
2021-05-21 13:25 chenguanyou
2021-05-21 16:37 ` Randy Dunlap
2021-05-18 11:16 chenguanyou
2021-05-19 11:28 ` Vlastimil Babka

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