Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] CPU: 0 UID: 0 PID: 17512 Comm: syz.4.2830 Not tainted 6.16.0-syzkaller-11241-g186f3edfdd41 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:btrfs_root_node+0x151/0x4a0 fs/btrfs/ctree.c:193 Code: 24 e8 53 87 02 fe c6 05 1d d5 cf 0b 01 48 c7 c7 e0 fe cc 8b be 4b 03 00 00 48 c7 c2 20 ff cc 8b e8 f4 6b e0 fd 48 8b 44 24 18 <42> 80 3c 30 00 74 08 4c 89 e7 e8 40 da 65 fe 4d 8b 2c 24 e8 c7 4e RSP: 0018:ffffc9000e05f800 EFLAGS: 00010287 RAX: 0000000000000003 RBX: ffffffff83bd171e RCX: 0000000000080000 RDX: ffffc9000b759000 RSI: 0000000000066eda RDI: 0000000000066edb RBP: ffffc9000e05f8c0 R08: 0000000000000000 R09: ffffffff83bd171e R10: dffffc0000000000 R11: ffffed1006cb380e R12: 0000000000000018 R13: ffff888026a3da00 R14: dffffc0000000000 R15: 0000000000000001 FS: 00007fad2e4c36c0(0000) GS:ffff888125c2a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c25c6da CR3: 0000000075cdd000 CR4: 0000000000350ef0 Call Trace: btrfs_read_lock_root_node+0x27/0xd0 fs/btrfs/locking.c:263 btrfs_build_ref_tree+0x113/0x1680 fs/btrfs/ref-verify.c:988 open_ctree+0x2504/0x3a10 fs/btrfs/disk-io.c:3594 btrfs_fill_super fs/btrfs/super.c:977 [inline] btrfs_get_tree_super fs/btrfs/super.c:1937 [inline] btrfs_get_tree_subvol fs/btrfs/super.c:2074 [inline] btrfs_get_tree+0xf55/0x1820 fs/btrfs/super.c:2108 vfs_get_tree+0x92/0x2b0 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: 0033:0x7fad2d59030a 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:00007fad2e4c2e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fad2e4c2ef0 RCX: 00007fad2d59030a RDX: 0000200000000080 RSI: 0000200000000040 RDI: 00007fad2e4c2eb0 RBP: 0000200000000080 R08: 00007fad2e4c2ef0 R09: 000000000001c005 R10: 000000000001c005 R11: 0000000000000246 R12: 0000200000000040 R13: 00007fad2e4c2eb0 R14: 00000000000055e1 R15: 0000200000000180 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:btrfs_root_node+0x151/0x4a0 fs/btrfs/ctree.c:193 Code: 24 e8 53 87 02 fe c6 05 1d d5 cf 0b 01 48 c7 c7 e0 fe cc 8b be 4b 03 00 00 48 c7 c2 20 ff cc 8b e8 f4 6b e0 fd 48 8b 44 24 18 <42> 80 3c 30 00 74 08 4c 89 e7 e8 40 da 65 fe 4d 8b 2c 24 e8 c7 4e RSP: 0018:ffffc9000e05f800 EFLAGS: 00010287 RAX: 0000000000000003 RBX: ffffffff83bd171e RCX: 0000000000080000 RDX: ffffc9000b759000 RSI: 0000000000066eda RDI: 0000000000066edb RBP: ffffc9000e05f8c0 R08: 0000000000000000 R09: ffffffff83bd171e R10: dffffc0000000000 R11: ffffed1006cb380e R12: 0000000000000018 R13: ffff888026a3da00 R14: dffffc0000000000 R15: 0000000000000001 FS: 00007fad2e4c36c0(0000) GS:ffff888125d2a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2fb19ff8 CR3: 0000000075cdd000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: e8 53 87 02 fe call 0xfe028758 5: c6 05 1d d5 cf 0b 01 movb $0x1,0xbcfd51d(%rip) # 0xbcfd529 c: 48 c7 c7 e0 fe cc 8b mov $0xffffffff8bccfee0,%rdi 13: be 4b 03 00 00 mov $0x34b,%esi 18: 48 c7 c2 20 ff cc 8b mov $0xffffffff8bccff20,%rdx 1f: e8 f4 6b e0 fd call 0xfde06c18 24: 48 8b 44 24 18 mov 0x18(%rsp),%rax * 29: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 e7 mov %r12,%rdi 33: e8 40 da 65 fe call 0xfe65da78 38: 4d 8b 2c 24 mov (%r12),%r13 3c: e8 .byte 0xe8 3d: c7 (bad) 3e: 4e rex.WRX