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charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: d69eb204c255 Merge tag 'net-6.17-rc5' of git://git.kernel... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16d01962580000 kernel config: https://syzkaller.appspot.com/x/.config?x=bd9738e00c1bbfb4 dashboard link: https://syzkaller.appspot.com/bug?extid=55c84106264e92ea9ada 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=1788c962580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12b0887c580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/efa41ea44c52/disk-d69eb204.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/d9ae66f326a4/vmlinux-d69eb204.xz kernel image: https://storage.googleapis.com/syzbot-assets/967c2253578b/bzImage-d69eb204.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/9e7c59fc7ab3/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+55c84106264e92ea9ada@syzkaller.appspotmail.com running recovery passes: check_allocations,check_extents_to_backpointers,check_inodes bcachefs (loop0): invalid bkey in btree_node btree=inodes level=0: u64s 18 type inode_v3 0:4102:U32_MAX len 0 ver 0: (unpack error) invalid variable length fields, deleting bcachefs (loop0): accounting_read... done bcachefs (loop0): alloc_read... done bcachefs (loop0): alloc_read... done bcachefs (loop0): snapshots_read... done bcachefs (loop0): check_allocations... ------------[ cut here ]------------ kernel BUG at fs/bcachefs/btree_iter.c:633! Oops: invalid opcode: 0000 [#1] SMP KASAN PTI CPU: 0 UID: 0 PID: 6000 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:bch2_btree_path_level_init+0xa01/0xa20 fs/bcachefs/btree_iter.c:633 Code: fd 90 0f 0b e8 90 05 a2 fd 90 0f 0b e8 88 05 a2 fd 90 0f 0b e8 80 05 a2 fd 90 0f 0b e8 78 05 a2 fd 90 0f 0b e8 70 05 a2 fd 90 <0f> 0b e8 68 05 a2 fd 90 0f 0b e8 60 05 a2 fd 90 0f 0b 66 66 66 66 RSP: 0018:ffffc90003f8e4a0 EFLAGS: 00010293 RAX: ffffffff841c59a0 RBX: ffff88803d33c2d8 RCX: ffff888030d73b80 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: ffffed1007c6c817 R12: 0000000000000052 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 000055557a974500(0000) GS:ffff8881268c1000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fff395c5f24 CR3: 0000000027dc0000 CR4: 00000000003526f0 Call Trace: btree_path_down fs/bcachefs/btree_iter.c:994 [inline] bch2_btree_path_traverse_one+0x1367/0x21d0 fs/bcachefs/btree_iter.c:1202 bch2_btree_path_traverse fs/bcachefs/btree_iter.h:250 [inline] __bch2_btree_iter_peek fs/bcachefs/btree_iter.c:2267 [inline] bch2_btree_iter_peek_max+0x9e8/0x58f0 fs/bcachefs/btree_iter.c:2384 bch2_btree_iter_peek_max_type fs/bcachefs/btree_iter.h:743 [inline] bch2_gc_btree fs/bcachefs/btree_gc.c:729 [inline] bch2_gc_btrees fs/bcachefs/btree_gc.c:792 [inline] bch2_check_allocations+0x120d/0x57b0 fs/bcachefs/btree_gc.c:1094 bch2_run_recovery_pass fs/bcachefs/recovery_passes.c:484 [inline] __bch2_run_recovery_passes+0x3bd/0x1060 fs/bcachefs/recovery_passes.c:539 bch2_run_recovery_passes+0x184/0x210 fs/bcachefs/recovery_passes.c:610 bch2_fs_recovery+0x2690/0x3a50 fs/bcachefs/recovery.c:1016 bch2_fs_start+0xaaf/0xda0 fs/bcachefs/super.c:1213 bch2_fs_get_tree+0xb39/0x1520 fs/bcachefs/fs.c:2488 vfs_get_tree+0x8f/0x2b0 fs/super.c:1815 do_new_mount+0x2a2/0x9e0 fs/namespace.c:3808 do_mount fs/namespace.c:4136 [inline] __do_sys_mount fs/namespace.c:4347 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4324 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: 0033:0x7fcb57f3038a Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007ffc365dc0a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffc365dc130 RCX: 00007fcb57f3038a RDX: 0000200000000040 RSI: 0000200000004940 RDI: 00007ffc365dc0f0 RBP: 0000200000000040 R08: 00007ffc365dc130 R09: 0000000000004000 R10: 0000000000004000 R11: 0000000000000246 R12: 0000200000004940 R13: 00007ffc365dc0f0 R14: 00000000000049ae R15: 0000200000000180 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:bch2_btree_path_level_init+0xa01/0xa20 fs/bcachefs/btree_iter.c:633 Code: fd 90 0f 0b e8 90 05 a2 fd 90 0f 0b e8 88 05 a2 fd 90 0f 0b e8 80 05 a2 fd 90 0f 0b e8 78 05 a2 fd 90 0f 0b e8 70 05 a2 fd 90 <0f> 0b e8 68 05 a2 fd 90 0f 0b e8 60 05 a2 fd 90 0f 0b 66 66 66 66 RSP: 0018:ffffc90003f8e4a0 EFLAGS: 00010293 RAX: ffffffff841c59a0 RBX: ffff88803d33c2d8 RCX: ffff888030d73b80 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: ffffed1007c6c817 R12: 0000000000000052 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 000055557a974500(0000) GS:ffff8881268c1000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fff395c5f24 CR3: 0000000027dc0000 CR4: 00000000003526f0 --- 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