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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) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspam-User: X-Stat-Signature: pb6honyqw1af87rz9rs7wm5rwfyf7gys X-Rspamd-Queue-Id: E456114000F X-Rspamd-Server: rspam06 X-HE-Tag: 1788835088-282463 X-HE-Meta: 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 xGL3LUMA 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 1wuLPd3Y Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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