From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 36A4A242D89 for ; Tue, 8 Sep 2026 02:38:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788835089; cv=none; b=Ks9dyqyZulth7Yyq5HNb0lT3oG65N4prNcTL23AEA/4CZ6ArDhHDVV0Bchbw1xfUTe5tM9DjSY9DFuT8LbJf4iEeFcHt8Q8LOfVRfg6bT1CDFynbJW6NnihWMI7Mk54cAz82k8h0FuO8LqMwnpeXEv4hUaSHQ+6lenZP4Nu4O0A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788835089; c=relaxed/simple; bh=ZO6BWUTrK4OLb/xzZYvpizxM1kZOMQ5Q2JarAiiVMsA=; h=Date:From:To:Cc:Subject:Message-Id:In-Reply-To:References: Mime-Version:Content-Type; b=WekRCmQUhQQBmrCTZEti6edv+YMB8K/YNX0T/R3sbq7MYb7YWDmStXbKwFOIU7jvIxHU757duCTrdZnsC7rvyoGBKQthXS/Tzo4CE9xljMbHANwdrUSS+i4ACh7iS6adY6vXQ29HO0BSbZl0yZuDIm3kfEQ1HqSFWENuhCNs2Io= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=uTPULx+T; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="uTPULx+T" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 617D11F00A3A; Tue, 8 Sep 2026 02:38:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1788835087; bh=efZgJABcoG5ggDnZhAKLlrjhxD8FD9hOCVM7mhQeFpU=; h=Date:From:To:Cc:Subject:In-Reply-To:References; b=uTPULx+T8gxPX+bbiKHFilFF9EHAF5AWTvUS7p8r95JPYvApttPFOFq1Q9LEjEnAj szCy4LqZA05c07jaZhRlFjp7TftqHtTtWLy7c9Z364JLL/EmNXQ1q6NF5z0FAU9IqE g2oS/XYfXxYGZxjyaluL3wXd8edItcIwC69DoRZQ= Date: Mon, 7 Sep 2026 19:38:06 -0700 From: Andrew Morton To: syzbot Cc: baohua@kernel.org, baoquan.he@linux.dev, chrisl@kernel.org, kasong@tencent.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, nphamcs@gmail.com, shikemeng@huaweicloud.com, syzkaller-bugs@googlegroups.com, youngjun.park@lge.com Subject: Re: [syzbot] [mm?] WARNING in swap_put_entries_direct Message-Id: <20260907193806.3f562237942e4156c3d4d53e@linux-foundation.org> In-Reply-To: <6a9f6350.6e6c5f9e.28f11f.0005.GAE@google.com> References: <6a9f6350.6e6c5f9e.28f11f.0005.GAE@google.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Mon, 07 Sep 2026 18:22:24 -0700 syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 8ab1afb2eb24 Merge tag 'for-7.3/dm-fixes' of git://git.ker.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=1034a125580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=85bc5cc2fc7394d9 > dashboard link: https://syzkaller.appspot.com/bug?extid=23b25ba3c6bf971f9c57 > compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 > userspace arch: i386 > > Unfortunately, I don't have any reproducer for this issue yet. > > Downloadable assets: > disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-8ab1afb2.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/4767b33b6704/vmlinux-8ab1afb2.xz > kernel image: https://storage.googleapis.com/syzbot-assets/aa0bdf390bbc/bzImage-8ab1afb2.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+23b25ba3c6bf971f9c57@syzkaller.appspotmail.com > > get_swap_device: Bad swap file entry 7c00000000000002 hm, thanks. https://syzkaller.appspot.com/x/log.txt?x=1034a125580000 reveals a huge storm of I/O errors: [ 1175.396574][ T1132] ata2: SATA link down (SStatus 0 SControl 300) [ 1175.417415][ T1123] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300) [ 1175.421618][ T1123] ata1.00: configured for UDMA/100 [ 1175.447991][ T1137] ata3: SATA link up 1.5 Gbps (SStatus 113 SControl 300) [ 1175.456823][ T1137] ata3.00: configured for UDMA/100 [ 1175.614247][ T5836] usb usb50-port1: unable to enumerate USB device [ 1175.647906][ T5108] Aborting journal on device sda1-8. [ 1175.651011][T12337] buffer_io_error: 18 callbacks suppressed [ 1175.651033][T12337] Buffer I/O error on dev sda1, logical block 131072, lost sync page write [ 1175.657294][T20237] EXT4-fs error (device sda1): ext4_journal_check_start:94: comm syz.5.3709: Detected aborted journal [ 1175.665579][ T5108] JBD2: I/O error when updating journal superblock for sda1-8. [ 1175.673842][T20239] EXT4-fs error (device sda1): ext4_journal_check_start:94: comm syz.6.3710: Detected aborted journal [ 1175.721163][ T5923] Buffer I/O error on dev sda1, logical block 0, lost sync page write [ 1175.723567][T20239] EXT4-fs (sda1): previous I/O error to superblock detected [ 1175.730930][ T5923] Buffer I/O error on dev sda1, logical block 0, lost sync page write [ 1175.731190][T20239] EXT4-fs (sda1): I/O error while writing superblock [ 1175.731223][T20239] EXT4-fs (sda1): Remounting filesystem read-only [ 1175.791874][T11112] Read-error on swap-device (8:0:516182) [ 1175.863539][T10850] Read-error on swap-device (8:0:364134) [ 1175.888507][T20241] EXT4-fs (sda1): shut down requested (2) [ 1175.908145][ T5726] Read-error on swap-device (8:0:332990) [ 1175.908919][ T5923] Read-error on swap-device (8:0:333014) [ 1175.909235][ T5923] Read-error on swap-device (8:0:313854) [ 1175.939843][T11112] Read-error on swap-device (8:0:356918) [ 1175.967225][ T5148] Read-error on swap-device (8:0:364766) [ 1175.979645][ T5724] Read-error on sw So I suspect something's wrong with shmem/swap error handling. ie, the code which doesn't get tested :( > ------------[ cut here ]------------ > !si > WARNING: mm/swapfile.c:2130 at swap_put_entries_direct+0x17d/0x1b0 mm/swapfile.c:2130, CPU#1: udevd/13167