running recovery pass check_topology (2), currently at recovery_pass_empty (0) running recovery pass scan_for_btree_nodes (1), currently at recovery_pass_empty (0) ret btree_node_read_err_bad_node bcachefs (loop0): error reading btree root btree=(unknown btree 36) level=0: btree_node_read_error, fixing bcachefs (loop0): check_topology... Oops: general protection fault, probably for non-canonical address 0xdffffc000000000e: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000070-0x0000000000000077] CPU: 0 UID: 0 PID: 5849 Comm: syz-executor289 Tainted: G W 6.16.0-syzkaller-11568-gd632ab86aff2 #0 PREEMPT_{RT,(full)} Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:kasan_byte_accessible+0x12/0x30 mm/kasan/generic.c:199 Code: 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 48 c1 ef 03 48 b8 00 00 00 00 00 fc ff df <0f> b6 04 07 3c 08 0f 92 c0 e9 10 40 db 08 cc 66 66 66 66 66 66 2e RSP: 0018:ffffc90004beee98 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffffffff844a7243 RCX: e699165fc746ba00 RDX: 0000000000000000 RSI: ffffffff844a7243 RDI: 000000000000000e RBP: ffffffff8417e6ec R08: 0000000000000001 R09: 0000000000000000 R10: dffffc0000000000 R11: fffffbfff1e39ee7 R12: 0000000000000001 R13: 0000000000000070 R14: 0000000000000070 R15: 0000000000000001 FS: 0000555583f31380(0000) GS:ffff8881268cd000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055def4af5be0 CR3: 000000003a4b8000 CR4: 00000000003526f0 Call Trace: __kasan_check_byte+0x12/0x40 mm/kasan/common.c:556 kasan_check_byte include/linux/kasan.h:399 [inline] lock_acquire+0x8d/0x360 kernel/locking/lockdep.c:5842 six_lock_ip_waiter+0xa3/0x170 fs/bcachefs/six.c:550 __btree_node_lock_nopath fs/bcachefs/btree_locking.h:237 [inline] btree_node_lock_nopath_nofail fs/bcachefs/btree_locking.h:260 [inline] bch2_check_topology+0x61a/0xe00 fs/bcachefs/btree_gc.c:601 bch2_run_recovery_pass fs/bcachefs/recovery_passes.c:484 [inline] __bch2_run_recovery_passes+0x3ba/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:3805 do_mount fs/namespace.c:4133 [inline] __do_sys_mount fs/namespace.c:4344 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4321 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: 0033:0x7f3cdbc4c12a Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc00a48558 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffc00a48570 RCX: 00007f3cdbc4c12a RDX: 00002000000000c0 RSI: 0000200000000180 RDI: 00007ffc00a48570 RBP: 0000200000000180 R08: 00007ffc00a485b0 R09: 000000000000593f R10: 0000000001808044 R11: 0000000000000282 R12: 00002000000000c0 R13: 00007ffc00a485b0 R14: 0000000000000003 R15: 0000000001808044 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:kasan_byte_accessible+0x12/0x30 mm/kasan/generic.c:199 Code: 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66 0f 1f 00 48 c1 ef 03 48 b8 00 00 00 00 00 fc ff df <0f> b6 04 07 3c 08 0f 92 c0 e9 10 40 db 08 cc 66 66 66 66 66 66 2e RSP: 0018:ffffc90004beee98 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffffffff844a7243 RCX: e699165fc746ba00 RDX: 0000000000000000 RSI: ffffffff844a7243 RDI: 000000000000000e RBP: ffffffff8417e6ec R08: 0000000000000001 R09: 0000000000000000 R10: dffffc0000000000 R11: fffffbfff1e39ee7 R12: 0000000000000001 R13: 0000000000000070 R14: 0000000000000070 R15: 0000000000000001 FS: 0000555583f31380(0000) GS:ffff8881268cd000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055def4af5be0 CR3: 000000003a4b8000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess): 0: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1) 7: 00 8: 90 nop 9: 90 nop a: 90 nop b: 90 nop c: 90 nop d: 90 nop e: 90 nop f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop 16: 90 nop 17: 90 nop 18: 66 0f 1f 00 nopw (%rax) 1c: 48 c1 ef 03 shr $0x3,%rdi 20: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 27: fc ff df * 2a: 0f b6 04 07 movzbl (%rdi,%rax,1),%eax <-- trapping instruction 2e: 3c 08 cmp $0x8,%al 30: 0f 92 c0 setb %al 33: e9 10 40 db 08 jmp 0x8db4048 38: cc int3 39: 66 data16 3a: 66 data16 3b: 66 data16 3c: 66 data16 3d: 66 data16 3e: 66 data16 3f: 2e cs