loop0: detected capacity change from 0 to 32768 BTRFS: device fsid a6a605fc-d5f1-4e66-8595-3726e2b761d6 devid 1 transid 8 /dev/loop0 (7:0) scanned by syz.0.0 (5327) BTRFS info (device loop0): first mount of filesystem a6a605fc-d5f1-4e66-8595-3726e2b761d6 BTRFS info (device loop0): using blake2b (blake2b-256-generic) checksum algorithm BTRFS info (device loop0): using free-space-tree 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: 5327 Comm: syz.0.0 Not tainted 6.15.0-syzkaller-11796-g5abc7438f1e9 #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: 17 86 e1 fd 48 83 c4 08 e8 4e 11 a8 07 89 c5 31 ff 89 c6 e8 23 b2 03 fe 85 ed 74 17 e8 4a 78 ea fd 84 c0 74 1c e8 d1 ad 03 fe <42> 80 3c 2b 00 75 4b eb 51 e8 c3 ad 03 fe 42 80 3c 2b 00 75 3d eb RSP: 0018:ffffc9000d347710 EFLAGS: 00010287 RAX: ffffffff83bcae9f RBX: 0000000000000003 RCX: 0000000000100000 RDX: ffffc9000e1d2000 RSI: 00000000000156c8 RDI: 00000000000156c9 RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff83bcae5c R10: dffffc0000000000 R11: ffffed100a68400e R12: ffffffff83bcae5c R13: dffffc0000000000 R14: 0000000000000018 R15: 0000000000000000 FS: 00007f8ebaf5d6c0(0000) GS:ffff88808d25c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5ad1cdf68c CR3: 0000000011817000 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+0x110/0x13e0 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:1802 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:1802 do_new_mount+0x24a/0xa40 fs/namespace.c:3856 do_mount fs/namespace.c:4193 [inline] __do_sys_mount fs/namespace.c:4404 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4381 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: 0033:0x7f8eba1900ca 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:00007f8ebaf5ce68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f8ebaf5cef0 RCX: 00007f8eba1900ca RDX: 0000200000000080 RSI: 0000200000000040 RDI: 00007f8ebaf5ceb0 RBP: 0000200000000080 R08: 00007f8ebaf5cef0 R09: 000000000001c005 R10: 000000000001c005 R11: 0000000000000246 R12: 0000200000000040 R13: 00007f8ebaf5ceb0 R14: 00000000000055cb R15: 00002000000002c0 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:btrfs_root_node+0x7f/0x3b0 fs/btrfs/ctree.c:193 Code: 17 86 e1 fd 48 83 c4 08 e8 4e 11 a8 07 89 c5 31 ff 89 c6 e8 23 b2 03 fe 85 ed 74 17 e8 4a 78 ea fd 84 c0 74 1c e8 d1 ad 03 fe <42> 80 3c 2b 00 75 4b eb 51 e8 c3 ad 03 fe 42 80 3c 2b 00 75 3d eb RSP: 0018:ffffc9000d347710 EFLAGS: 00010287 RAX: ffffffff83bcae9f RBX: 0000000000000003 RCX: 0000000000100000 RDX: ffffc9000e1d2000 RSI: 00000000000156c8 RDI: 00000000000156c9 RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff83bcae5c R10: dffffc0000000000 R11: ffffed100a68400e R12: ffffffff83bcae5c R13: dffffc0000000000 R14: 0000000000000018 R15: 0000000000000000 FS: 00007f8ebaf5d6c0(0000) GS:ffff88808d25c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005639a21e5070 CR3: 0000000011817000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 86 e1 xchg %ah,%cl 2: fd std 3: 48 83 c4 08 add $0x8,%rsp 7: e8 4e 11 a8 07 call 0x7a8115a c: 89 c5 mov %eax,%ebp e: 31 ff xor %edi,%edi 10: 89 c6 mov %eax,%esi 12: e8 23 b2 03 fe call 0xfe03b23a 17: 85 ed test %ebp,%ebp 19: 74 17 je 0x32 1b: e8 4a 78 ea fd call 0xfdea786a 20: 84 c0 test %al,%al 22: 74 1c je 0x40 24: e8 d1 ad 03 fe call 0xfe03adfa * 29: 42 80 3c 2b 00 cmpb $0x0,(%rbx,%r13,1) <-- trapping instruction 2e: 75 4b jne 0x7b 30: eb 51 jmp 0x83 32: e8 c3 ad 03 fe call 0xfe03adfa 37: 42 80 3c 2b 00 cmpb $0x0,(%rbx,%r13,1) 3c: 75 3d jne 0x7b 3e: eb .byte 0xeb