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

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Message-Id: <20240715205140.c260410215836e753a44b5e9@linux-foundation.org>
Date: Mon, 15 Jul 2024 20:51:40 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: syzbot <syzbot+a3e82ae343b26b4d2335@...kaller.appspotmail.com>
Cc: aleksandr.mikhalitsyn@...onical.com, brauner@...nel.org, jack@...e.cz,
 linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-mm@...ck.org, syzkaller-bugs@...glegroups.com,
 viro@...iv.linux.org.uk
Subject: Re: [syzbot] [mm?] BUG: sleeping function called from invalid
 context in vma_alloc_folio_noprof

On Mon, 15 Jul 2024 18:24:19 -0700 syzbot <syzbot+a3e82ae343b26b4d2335@...kaller.appspotmail.com> wrote:

> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    3fe121b62282 Add linux-next specific files for 20240712
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=12ba9149980000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=98dd8c4bab5cdce
> dashboard link: https://syzkaller.appspot.com/bug?extid=a3e82ae343b26b4d2335
> compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=144c4b66980000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=163c28f6980000
> 
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/8c6fbf69718d/disk-3fe121b6.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/39fc7e43dfc1/vmlinux-3fe121b6.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/0a78e70e4b4e/bzImage-3fe121b6.xz
> 
> The issue was bisected to:
> 
> commit ca567df74a28a9fb368c6b2d93e864113f73f5c2
> Author: Christian Brauner <brauner@...nel.org>
> Date:   Sun Jun 7 20:47:08 2020 +0000
> 
>     nsfs: add pid translation ioctls
> 

yup, thanks.  Breaking out of the switch statement while holding
rcu_read_lock().