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charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: f79e772258df Merge tag 'media/v6.18-1' of git://git.kernel.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=151d1ee2580000 kernel config: https://syzkaller.appspot.com/x/.config?x=7f967f2c97bd611a dashboard link: https://syzkaller.appspot.com/bug?extid=6fdd8fa3380730a4b22c compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16e84458580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=163c9214580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-f79e7722.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/9d29501fc412/vmlinux-f79e7722.xz kernel image: https://storage.googleapis.com/syzbot-assets/773691b45948/bzImage-f79e7722.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/2a53f186d930/mount_0.gz fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=12731092580000) IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6fdd8fa3380730a4b22c@syzkaller.appspotmail.com option from the mount to silence this warning. ======================================================= ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode. ------------[ cut here ]------------ kernel BUG at fs/ocfs2/refcounttree.c:2678! Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 5498 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~bpo12+1 04/01/2014 RIP: 0010:ocfs2_refcount_cal_cow_clusters+0x12a1/0x12b0 fs/ocfs2/refcounttree.c:2678 Code: 94 6d 8d ba 69 0a 00 00 48 c7 c1 a0 40 8b 8b 4c 8b 4c 24 30 e8 00 51 10 00 90 0f 0b e8 d8 83 17 fe 90 0f 0b e8 d0 83 17 fe 90 <0f> 0b 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 RSP: 0018:ffffc90002bbf5e0 EFLAGS: 00010293 RAX: ffffffff83a70250 RBX: 1ffff1100863069a RCX: ffff888000bdc900 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90002bbf7a8 R08: 00000000ffffffff R09: ffffc90002bbf85c R10: 00000000fffffffc R11: 0000000000000000 R12: 0000000000000000 R13: 1ffff1100863069a R14: ffff8880431834d0 R15: 0000000000000000 FS: 0000555579608500(0000) GS:ffff88808d969000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000000b000 CR3: 000000004f2d3000 CR4: 0000000000352ef0 Call Trace: ocfs2_refcount_cow_hunk fs/ocfs2/refcounttree.c:3385 [inline] ocfs2_refcount_cow+0x31f/0xc90 fs/ocfs2/refcounttree.c:3467 ocfs2_prepare_inode_for_write fs/ocfs2/file.c:2340 [inline] ocfs2_file_write_iter+0xe28/0x1d10 fs/ocfs2/file.c:2451 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x5c9/0xb30 fs/read_write.c:686 ksys_write+0x145/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f386f58eec9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffecc491f98 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f386f7e5fa0 RCX: 00007f386f58eec9 RDX: 000000000000001c RSI: 0000200000000100 RDI: 0000000000000005 RBP: 00007f386f611f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f386f7e5fa0 R14: 00007f386f7e5fa0 R15: 0000000000000003 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ocfs2_refcount_cal_cow_clusters+0x12a1/0x12b0 fs/ocfs2/refcounttree.c:2678 Code: 94 6d 8d ba 69 0a 00 00 48 c7 c1 a0 40 8b 8b 4c 8b 4c 24 30 e8 00 51 10 00 90 0f 0b e8 d8 83 17 fe 90 0f 0b e8 d0 83 17 fe 90 <0f> 0b 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 RSP: 0018:ffffc90002bbf5e0 EFLAGS: 00010293 RAX: ffffffff83a70250 RBX: 1ffff1100863069a RCX: ffff888000bdc900 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90002bbf7a8 R08: 00000000ffffffff R09: ffffc90002bbf85c R10: 00000000fffffffc R11: 0000000000000000 R12: 0000000000000000 R13: 1ffff1100863069a R14: ffff8880431834d0 R15: 0000000000000000 FS: 0000555579608500(0000) GS:ffff88808d969000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000000b000 CR3: 000000004f2d3000 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 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