linux-kernel - Re: [syzbot] [fs?] [usb?] INFO: rcu detected stall in vfs

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Message-ID: <20230522-antennen-eislauf-4b5a69a167e3@brauner>
Date:   Mon, 22 May 2023 15:01:33 +0200
From:   Christian Brauner <brauner@...nel.org>
To:     syzbot <syzbot+24d1639a31b024b125bd@...kaller.appspotmail.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        viro@...iv.linux.org.uk
Subject: Re: [syzbot] [fs?] [usb?] INFO: rcu detected stall in vfs_readlink

On Fri, May 19, 2023 at 08:18:45PM -0700, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    a4422ff22142 usb: typec: qcom: Add Qualcomm PMIC Type-C dr..
> git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing
> console output: https://syzkaller.appspot.com/x/log.txt?x=10ce218e280000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=2414a945e4542ec1
> dashboard link: https://syzkaller.appspot.com/bug?extid=24d1639a31b024b125bd
> 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=137d4c06280000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17b758a1280000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/414817142fb7/disk-a4422ff2.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/448dba0d344e/vmlinux-a4422ff2.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/d0ad9fe848e2/bzImage-a4422ff2.xz
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+24d1639a31b024b125bd@...kaller.appspotmail.com
> 
> imon 1-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored
> imon 5-1:0.0: imon usb_rx_callback_intf0: status(-71): ignored

I have the strong suspicion that the usb drive is removed or some such
nonsense. Doesn't seem an fs bug.