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Sun, 27 Sep 2026 00:00:30 -0700 (PDT) Date: Sun, 27 Sep 2026 00:00:30 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ab8bf0e.80e1c6cc.1e8e5f.0053.GAE@google.com> From: syzbot To: chao@kernel.org, jaegeuk@kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com X-Headers-End: 1xAisG-0000zX-Dy Subject: [f2fs-dev] [syzbot] [f2fs?] kernel BUG in f2fs_write_end_bio X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net Hello, syzbot found the following issue on: HEAD commit: fe2ec83746e5 Merge tag 'hid-for-linus-2026092202' of git:/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13ba8d25580000 kernel config: https://syzkaller.appspot.com/x/.config?x=2b924f079099ba6e dashboard link: https://syzkaller.appspot.com/bug?extid=eae639926b1c1ac725d5 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 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-fe2ec837.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/64158d6729cc/vmlinux-fe2ec837.xz kernel image: https://storage.googleapis.com/syzbot-assets/4e2043b7fc3f/bzImage-fe2ec837.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+eae639926b1c1ac725d5@syzkaller.appspotmail.com F2FS-fs (loop0): inconsistent node block, node_type:0, nid:3, node_footer[nid:0,ino:0,ofs:0,cpver:0,blkaddr:0] ------------[ cut here ]------------ kernel BUG at fs/f2fs/data.c:365! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 1055 Comm: kworker/u4:9 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Workqueue: loop0 loop_workfn RIP: 0010:f2fs_write_end_bio+0x167d/0x16e0 fs/f2fs/data.c:365 Code: 67 5f 8c e8 75 15 c1 fc 90 0f 0b e8 1d e0 60 fd 48 8b 7c 24 08 48 c7 c6 20 67 5f 8c e8 5c 15 c1 fc 90 0f 0b e8 04 e0 60 fd 90 <0f> 0b e8 fc df 60 fd 48 8b 7c 24 08 48 c7 c6 20 67 5f 8c e8 3b 15 RSP: 0018:ffffc9000527f490 EFLAGS: 00010293 RAX: ffffffff84670d0c RBX: 0000000000000003 RCX: ffff888036980000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: ffffea00010bb900 R08: ffffffff907a767f R09: 1ffffffff20f4ecf R10: dffffc0000000000 R11: fffffbfff20f4ed0 R12: ffffea00010bb8c0 R13: dffffc0000000000 R14: 0000000000001000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88808c2c0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fcdf33c4d10 CR3: 000000003b2bb000 CR4: 0000000000352ef0 Call Trace: blk_update_request+0x57b/0xe50 block/blk-mq.c:1016 blk_mq_end_request+0x3e/0x70 block/blk-mq.c:1147 lo_rw_aio_complete drivers/block/loop.c:338 [inline] lo_rw_aio+0xcd4/0xf20 drivers/block/loop.c:406 do_req_filebacked drivers/block/loop.c:430 [inline] loop_handle_cmd drivers/block/loop.c:1949 [inline] loop_process_work+0x621/0x11c0 drivers/block/loop.c:1984 process_one_work kernel/workqueue.c:3396 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:f2fs_write_end_bio+0x167d/0x16e0 fs/f2fs/data.c:365 Code: 67 5f 8c e8 75 15 c1 fc 90 0f 0b e8 1d e0 60 fd 48 8b 7c 24 08 48 c7 c6 20 67 5f 8c e8 5c 15 c1 fc 90 0f 0b e8 04 e0 60 fd 90 <0f> 0b e8 fc df 60 fd 48 8b 7c 24 08 48 c7 c6 20 67 5f 8c e8 3b 15 RSP: 0018:ffffc9000527f490 EFLAGS: 00010293 RAX: ffffffff84670d0c RBX: 0000000000000003 RCX: ffff888036980000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: ffffea00010bb900 R08: ffffffff907a767f R09: 1ffffffff20f4ecf R10: dffffc0000000000 R11: fffffbfff20f4ed0 R12: ffffea00010bb8c0 R13: dffffc0000000000 R14: 0000000000001000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88808c2c0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fcdf33c4d10 CR3: 000000001f6d9000 CR4: 0000000000352ef0 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel