loop0: detected capacity change from 0 to 32768 BTRFS: device fsid c9fe44da-de57-406a-8241-57ec7d4412cf devid 1 transid 8 /dev/loop0 (7:0) scanned by syz.0.0 (5105) BTRFS info (device loop0): first mount of filesystem c9fe44da-de57-406a-8241-57ec7d4412cf BTRFS info (device loop0): using crc32c (crc32c-intel) checksum algorithm BTRFS info (device loop0): using free-space-tree Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f] CPU: 0 UID: 0 PID: 5105 Comm: syz.0.0 Not tainted 6.11.0-rc6-syzkaller #0 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+0x86/0x3b0 fs/btrfs/ctree.c:260 Code: b0 9b c8 fd 48 83 c4 08 e8 57 71 12 08 89 c3 31 ff 89 c6 e8 5c 60 ec fd 85 db 74 17 e8 43 92 d2 fd 84 c0 74 1c e8 0a 5c ec fd <43> 80 3c 3c 00 75 4b eb 51 e8 fc 5b ec fd 43 80 3c 3c 00 75 3d eb RSP: 0018:ffffc9000350f6c0 EFLAGS: 00010246 RAX: ffffffff83a73026 RBX: 0000000000000001 RCX: 0000000000040000 RDX: ffffc900032c2000 RSI: 000000000003ffff RDI: 0000000000040000 RBP: ffffc9000350f8b0 R08: ffffffff83a73014 R09: 1ffffffff283c908 R10: dffffc0000000000 R11: fffffbfff283c909 R12: 0000000000000003 R13: dffffc0000000000 R14: 0000000000000018 R15: dffffc0000000000 FS: 00007f3a6560c6c0(0000) GS:ffff88801fe00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f55608c2723 CR3: 0000000040c7a000 CR4: 0000000000350ef0 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:279 btrfs_build_ref_tree+0x112/0x16f0 fs/btrfs/ref-verify.c:1005 open_ctree+0x1fea/0x2a10 fs/btrfs/disk-io.c:3533 btrfs_fill_super fs/btrfs/super.c:965 [inline] btrfs_get_tree_super fs/btrfs/super.c:1888 [inline] btrfs_get_tree+0xe7a/0x1920 fs/btrfs/super.c:2114 vfs_get_tree+0x90/0x2b0 fs/super.c:1800 fc_mount+0x1b/0xb0 fs/namespace.c:1231 btrfs_get_tree_subvol fs/btrfs/super.c:2077 [inline] btrfs_get_tree+0x652/0x1920 fs/btrfs/super.c:2115 vfs_get_tree+0x90/0x2b0 fs/super.c:1800 do_new_mount+0x2be/0xb40 fs/namespace.c:3472 do_mount fs/namespace.c:3812 [inline] __do_sys_mount fs/namespace.c:4020 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3997 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f3a6477b65a 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:00007f3a6560be68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f3a6560bef0 RCX: 00007f3a6477b65a RDX: 0000000020005100 RSI: 0000000020000040 RDI: 00007f3a6560beb0 RBP: 0000000020005100 R08: 00007f3a6560bef0 R09: 0000000000a08811 R10: 0000000000a08811 R11: 0000000000000246 R12: 0000000020000040 R13: 00007f3a6560beb0 R14: 000000000000511e R15: 0000000020000240 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:btrfs_root_node+0x86/0x3b0 fs/btrfs/ctree.c:260 Code: b0 9b c8 fd 48 83 c4 08 e8 57 71 12 08 89 c3 31 ff 89 c6 e8 5c 60 ec fd 85 db 74 17 e8 43 92 d2 fd 84 c0 74 1c e8 0a 5c ec fd <43> 80 3c 3c 00 75 4b eb 51 e8 fc 5b ec fd 43 80 3c 3c 00 75 3d eb RSP: 0018:ffffc9000350f6c0 EFLAGS: 00010246 RAX: ffffffff83a73026 RBX: 0000000000000001 RCX: 0000000000040000 RDX: ffffc900032c2000 RSI: 000000000003ffff RDI: 0000000000040000 RBP: ffffc9000350f8b0 R08: ffffffff83a73014 R09: 1ffffffff283c908 R10: dffffc0000000000 R11: fffffbfff283c909 R12: 0000000000000003 R13: dffffc0000000000 R14: 0000000000000018 R15: dffffc0000000000 FS: 00007f3a6560c6c0(0000) GS:ffff88801fe00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055d3a53d6000 CR3: 0000000040c7a000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 3 bytes skipped: 0: fd std 1: 48 83 c4 08 add $0x8,%rsp 5: e8 57 71 12 08 call 0x8127161 a: 89 c3 mov %eax,%ebx c: 31 ff xor %edi,%edi e: 89 c6 mov %eax,%esi 10: e8 5c 60 ec fd call 0xfdec6071 15: 85 db test %ebx,%ebx 17: 74 17 je 0x30 19: e8 43 92 d2 fd call 0xfdd29261 1e: 84 c0 test %al,%al 20: 74 1c je 0x3e 22: e8 0a 5c ec fd call 0xfdec5c31 * 27: 43 80 3c 3c 00 cmpb $0x0,(%r12,%r15,1) <-- trapping instruction 2c: 75 4b jne 0x79 2e: eb 51 jmp 0x81 30: e8 fc 5b ec fd call 0xfdec5c31 35: 43 80 3c 3c 00 cmpb $0x0,(%r12,%r15,1) 3a: 75 3d jne 0x79 3c: eb .byte 0xeb