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: 5309 Comm: syz-executor282 Not tainted 6.15.0-syzkaller-01599-gddddf9d64f73 #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:btrfs_root_node+0x7f/0x3b0 fs/btrfs/ctree.c:193 Code: a7 e1 e4 fd 48 83 c4 08 e8 de ae a0 07 89 c5 31 ff 89 c6 e8 23 df 06 fe 85 ed 74 17 e8 ea bf ed fd 84 c0 74 1c e8 d1 da 06 fe <42> 80 3c 2b 00 75 4b eb 51 e8 c3 da 06 fe 42 80 3c 2b 00 75 3d eb RSP: 0018:ffffc9000d23f750 EFLAGS: 00010293 RAX: ffffffff83b84f8f RBX: 0000000000000003 RCX: ffff88801fd28000 RDX: 0000000000000000 RSI: ffffffff8bc23560 RDI: ffffffff8bc23520 RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff83b84f4c R10: dffffc0000000000 R11: ffffed10086b400e R12: ffffffff83b84f4c R13: dffffc0000000000 R14: 0000000000000018 R15: ffff88803f1aa6e0 FS: 00005555605ed380(0000) GS:ffff88808d6b1000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055cd9693c5f8 CR3: 0000000043576000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: btrfs_read_lock_root_node+0x27/0xd0 fs/btrfs/locking.c:263 btrfs_build_ref_tree+0x112/0x12b0 fs/btrfs/ref-verify.c:1006 open_ctree+0x1d81/0x2800 fs/btrfs/disk-io.c:3594 btrfs_fill_super+0x19d/0x2e0 fs/btrfs/super.c:968 btrfs_get_tree_super fs/btrfs/super.c:1893 [inline] btrfs_get_tree+0x107c/0x1630 fs/btrfs/super.c:2088 vfs_get_tree+0x8f/0x2b0 fs/super.c:1809 fc_mount+0x1c/0xb0 fs/namespace.c:1290 btrfs_get_tree_subvol fs/btrfs/super.c:2046 [inline] btrfs_get_tree+0x67d/0x1630 fs/btrfs/super.c:2089 vfs_get_tree+0x8f/0x2b0 fs/super.c:1809 do_new_mount+0x24a/0xa40 fs/namespace.c:3882 do_mount fs/namespace.c:4222 [inline] __do_sys_mount fs/namespace.c:4433 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4410 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5eeca74faa 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:00007ffcb4437618 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffcb4437630 RCX: 00007f5eeca74faa RDX: 0000200000000080 RSI: 0000200000000040 RDI: 00007ffcb4437630 RBP: 0000200000000040 R08: 00007ffcb4437670 R09: 00000000000055c5 R10: 000000000001c005 R11: 0000000000000282 R12: 0000200000000080 R13: 0000000000000004 R14: 0000000000000003 R15: 00007ffcb4437670 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:btrfs_root_node+0x7f/0x3b0 fs/btrfs/ctree.c:193 Code: a7 e1 e4 fd 48 83 c4 08 e8 de ae a0 07 89 c5 31 ff 89 c6 e8 23 df 06 fe 85 ed 74 17 e8 ea bf ed fd 84 c0 74 1c e8 d1 da 06 fe <42> 80 3c 2b 00 75 4b eb 51 e8 c3 da 06 fe 42 80 3c 2b 00 75 3d eb RSP: 0018:ffffc9000d23f750 EFLAGS: 00010293 RAX: ffffffff83b84f8f RBX: 0000000000000003 RCX: ffff88801fd28000 RDX: 0000000000000000 RSI: ffffffff8bc23560 RDI: ffffffff8bc23520 RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff83b84f4c R10: dffffc0000000000 R11: ffffed10086b400e R12: ffffffff83b84f4c R13: dffffc0000000000 R14: 0000000000000018 R15: ffff88803f1aa6e0 FS: 00005555605ed380(0000) GS:ffff88808d6b1000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000562c394584e0 CR3: 0000000043576000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: a7 cmpsl %es:(%rdi),%ds:(%rsi) 1: e1 e4 loope 0xffffffe7 3: fd std 4: 48 83 c4 08 add $0x8,%rsp 8: e8 de ae a0 07 call 0x7a0aeeb d: 89 c5 mov %eax,%ebp f: 31 ff xor %edi,%edi 11: 89 c6 mov %eax,%esi 13: e8 23 df 06 fe call 0xfe06df3b 18: 85 ed test %ebp,%ebp 1a: 74 17 je 0x33 1c: e8 ea bf ed fd call 0xfdedc00b 21: 84 c0 test %al,%al 23: 74 1c je 0x41 25: e8 d1 da 06 fe call 0xfe06dafb * 2a: 42 80 3c 2b 00 cmpb $0x0,(%rbx,%r13,1) <-- trapping instruction 2f: 75 4b jne 0x7c 31: eb 51 jmp 0x84 33: e8 c3 da 06 fe call 0xfe06dafb 38: 42 80 3c 2b 00 cmpb $0x0,(%rbx,%r13,1) 3d: 75 3d jne 0x7c 3f: eb .byte 0xeb