linux-kernel - Re: [syzbot] BUG: sleeping function called from invalid context in __access_remote

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Message-ID: <07bc89cf-643b-9aa8-5683-a181d049ab85@I-love.SAKURA.ne.jp>
Date:   Mon, 22 Aug 2022 19:03:41 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:     Helge Deller <deller@....de>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Josh Triplett <josh@...htriplett.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     syzbot <syzbot+5fb61eb0bea5eab81137@...kaller.appspotmail.com>,
        xu.xin16@....com.cn, syzkaller-bugs@...glegroups.com,
        linux-kernel@...r.kernel.org, keescook@...omium.org,
        chengzhihao1@...wei.com, brauner@...nel.org
Subject: Re: [syzbot] BUG: sleeping function called from invalid context in
 __access_remote_vm

Caused by commit 38a12ad69d86f801 ("lib/dump_stack: add dump_stack_print_cmdline()
and wire up in dump_stack_print_info()"). You can't call get_task_cmdline_kernel()
 from dump_stack() due to printk_cpu_sync_get_irqsave(flags) from dump_stack_lvl().

Andrew, please drop that patch.

On 2022/08/22 18:09, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    8755ae45a9e8 Add linux-next specific files for 20220819
> git tree:       linux-next
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=14c3b6eb080000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=ead6107a3bbe3c62
> dashboard link: https://syzkaller.appspot.com/bug?extid=5fb61eb0bea5eab81137
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=166bdb3d080000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16298e5b080000
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+5fb61eb0bea5eab81137@...kaller.appspotmail.com
>