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From: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
To: Dmitry Vyukov <dvyukov@google.com>
Cc: syzbot <syzbot+f0fc7f62e88b1de99af3@syzkaller.appspotmail.com>,
	'Dmitry Vyukov' via syzkaller-upstream-moderation
	<syzkaller-upstream-moderation@googlegroups.com>,
	linux-mm <linux-mm@kvack.org>, Michal Hocko <mhocko@kernel.org>
Subject: Re: INFO: task hung in ext4_da_get_block_prep
Date: Thu, 06 Sep 2018 14:53:48 +0900	[thread overview]
Message-ID: <201809060553.w865rmpj036017@www262.sakura.ne.jp> (raw)
In-Reply-To: <CACT4Y+Yp6ZbusCWg5C1zaJpcS8=XnGPboKgWfyxVk1axQA2nbw@mail.gmail.com>

Dmitry Vyukov wrote:
> > Also, another notable thing is that the backtrace for some reason includes
> >
> > [ 1048.211540]  ? oom_killer_disable+0x3a0/0x3a0
> >
> > line. Was syzbot testing process freezing functionality?
> 
> What's the API for this?
> 

I'm not a user of suspend/hibernation. But it seems that usage of the API
is to write one of words listed in /sys/power/state into /sys/power/state .

# echo suspend > /sys/power/state

  reply	other threads:[~2018-09-06  5:54 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <0000000000004a6b700575178b5a@google.com>
     [not found] ` <CACT4Y+aPRGUqAdJCMDWM=Zcy8ZQcHyrsB1ZuWS4VB_+wvLfeaQ@mail.gmail.com>
2018-09-05 10:53   ` INFO: task hung in ext4_da_get_block_prep Tetsuo Handa
2018-09-05 11:06     ` Dmitry Vyukov
2018-09-06  5:53       ` Tetsuo Handa [this message]
2018-09-06  9:54         ` Dmitry Vyukov
2018-09-06 10:58           ` [PATCH] mm, oom: Introduce time limit for dump_tasks duration Tetsuo Handa
2018-09-06 11:07             ` Dmitry Vyukov
2018-09-06 11:25               ` Tetsuo Handa
2018-09-06 11:23             ` Michal Hocko
2018-09-06 11:40               ` Tetsuo Handa
2018-09-06 11:53                 ` Michal Hocko
2018-09-06 12:08                   ` Dmitry Vyukov
2018-09-06 12:16                     ` Michal Hocko
2018-09-11 16:37                       ` Oleg Nesterov
2018-09-12 16:45                         ` Oleg Nesterov
2018-09-06 13:45                   ` Tetsuo Handa
2018-09-06 14:39                     ` Michal Hocko
2018-09-06 20:58                       ` Tetsuo Handa
2018-09-07  8:27                         ` Michal Hocko
2018-09-07  9:36                           ` Dmitry Vyukov
2018-09-07 10:49                             ` Tetsuo Handa
2018-09-07 11:08                             ` Michal Hocko
2018-09-08 14:00                               ` Dmitry Vyukov
2018-09-10 14:36                                 ` Dmitry Vyukov
2018-09-07 10:20                           ` Tetsuo Handa
2019-03-03 11:33 ` INFO: task hung in ext4_da_get_block_prep syzbot

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