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AFNElJ9ZG5j+2UyrDgM3jDzvhGPrGsw0WiJGdljb7IUuVy5+mYkU6vt0VsEXCDdoAvA/ePTDyzcR+Lm+QNTzVGQ=@vger.kernel.org X-Gm-Message-State: AOJu0YyCb364zdS8KQYE/FUPFL4mdHuIz/nz3H/tO8p33uZs6BGmEUTr 2rJ/SkEhgwgN+nzsK++OXg1I5auumtn4ZCCIYhVzTNRPifjjmahf0KkL6jjSDivu3c8I01Ks+sU E8rc+8Ra2plKQh4GGkwxDPc5q73rBvhs9MfRmSY45DQifOYI3TF8m3FOEzxY= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:2383:b0:497:df42:1e04 with SMTP id 5614622812f47-499b741a01dmr5412579b6e.18.1783318228080; Sun, 05 Jul 2026 23:10:28 -0700 (PDT) Date: Sun, 05 Jul 2026 23:10:28 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a4b46d4.b42ede87.8bd1.001b.GAE@google.com> Subject: [syzbot] [nilfs?] WARNING in nilfs_cpfile_delete_checkpoints From: syzbot To: konishi.ryusuke@gmail.com, linux-kernel@vger.kernel.org, linux-nilfs@vger.kernel.org, slava@dubeyko.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 71dfdfb0209b Merge tag 'vfs-7.2-rc2.fixes' of git://git.ke.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10c00d39580000 kernel config: https://syzkaller.appspot.com/x/.config?x=20c9876b0f77b546 dashboard link: https://syzkaller.appspot.com/bug?extid=79b815da3aec0a6a4d02 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14d01c6e580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12776e6e580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-71dfdfb0.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/522f1a761fe1/vmlinux-71dfdfb0.xz kernel image: https://storage.googleapis.com/syzbot-assets/595943c8baaa/bzImage-71dfdfb0.xz mounted in repro #1: https://storage.googleapis.com/syzbot-assets/e2143050dc41/mount_0.gz mounted in repro #2: https://storage.googleapis.com/syzbot-assets/958ab3f4c7bb/mount_5.gz mounted in repro #3: https://storage.googleapis.com/syzbot-assets/77f82daa3be0/mount_6.gz fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=15143946580000) IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+79b815da3aec0a6a4d02@syzkaller.appspotmail.com ------------[ cut here ]------------ le32_to_cpu(cp->cp_checkpoints_count) < n WARNING: fs/nilfs2/cpfile.c:94 at nilfs_cpfile_block_sub_valid_checkpoints fs/nilfs2/cpfile.c:94 [inline], CPU#0: syz.0.17/5467 WARNING: fs/nilfs2/cpfile.c:94 at nilfs_cpfile_delete_checkpoints+0x913/0xce0 fs/nilfs2/cpfile.c:522, CPU#0: syz.0.17/5467 Modules linked in: CPU: 0 UID: 0 PID: 5467 Comm: syz.0.17 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 RIP: 0010:nilfs_cpfile_block_sub_valid_checkpoints fs/nilfs2/cpfile.c:94 [inline] RIP: 0010:nilfs_cpfile_delete_checkpoints+0x913/0xce0 fs/nilfs2/cpfile.c:522 Code: fb ff 41 89 c6 31 ff 89 c6 e8 e9 f9 f1 fd 45 85 f6 0f 85 6a 03 00 00 e8 9b f5 f1 fd 45 31 f6 e9 23 fd ff ff e8 8e f5 f1 fd 90 <0f> 0b 90 e9 d0 fe ff ff 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 0a f9 RSP: 0018:ffffc900025df4e0 EFLAGS: 00010293 RAX: ffffffff83d48d02 RBX: 1ffff11006feb480 RCX: ffff88803462a540 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000000 RBP: ffffc900025df630 R08: ffffea0000dfd687 R09: 1ffffd40001bfad0 R10: dffffc0000000000 R11: fffff940001bfad1 R12: 0000000000000005 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff888037f5a404 FS: 0000555559731500(0000) GS:ffff88808c54e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000010 CR3: 0000000044683000 CR4: 0000000000352ef0 Call Trace: nilfs_ioctl_delete_checkpoints fs/nilfs2/ioctl.c:680 [inline] nilfs_ioctl_prepare_clean_segments+0x158/0x840 fs/nilfs2/ioctl.c:787 nilfs_clean_segments+0x2b6/0xbb0 fs/nilfs2/segment.c:2546 nilfs_ioctl_clean_segments fs/nilfs2/ioctl.c:922 [inline] nilfs_ioctl+0x2619/0x2780 fs/nilfs2/ioctl.c:1352 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff42779de59 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd20bf4538 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ff427a25fa0 RCX: 00007ff42779de59 RDX: 0000200000000640 RSI: 0000000040786e88 RDI: 0000000000000009 RBP: 00007ff427833e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff427a25fac R14: 00007ff427a25fa0 R15: 00007ff427a25fa0 --- 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 syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. 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