linux-kernel - Re: WARNING in ptrace

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Message-ID: <20200724060243.GA17209@redhat.com>
Date:   Fri, 24 Jul 2020 08:02:44 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     syzbot <syzbot+e7a125aff38791d8cb65@...kaller.appspotmail.com>
Cc:     christian@...uner.io, davej@...emonkey.org.uk,
        ebiederm@...ssion.com, linux-kernel@...r.kernel.org,
        liuzhiqiang26@...wei.com, paul.gortmaker@...driver.com,
        peterz@...radead.org, syzkaller-bugs@...glegroups.com
Subject: Re: WARNING in ptrace_stop

On 07/23, syzbot wrote:
>
> do not call blocking ops when !TASK_RUNNING; state=8 set at [<00000000076362f5>] ptrace_stop+0x0/0x9e0 kernel/signal.c:2054
> WARNING: CPU: 1 PID: 17054 at kernel/sched/core.c:6883 __might_sleep+0x135/0x190 kernel/sched/core.c:6883

#syz fix: sched: Fix race against ptrace_freeze_trace()