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 (5325) BTRFS info (device loop0 state S): first mount of filesystem a6a605fc-d5f1-4e66-8595-3726e2b761d6 BTRFS info (device loop0 state S): using blake2b (blake2b-256-generic) checksum algorithm BTRFS info (device loop0 state S): 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: 5325 Comm: syz.0.0 Not tainted 6.16.0-rc2-syzkaller-00047-g52da431bf03b #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: 77 71 e1 fd 48 83 c4 08 e8 4e 8f a9 07 89 c5 31 ff 89 c6 e8 73 a0 03 fe 85 ed 74 17 e8 2a 63 ea fd 84 c0 74 1c e8 21 9c 03 fe <42> 80 3c 2b 00 75 4b eb 51 e8 13 9c 03 fe 42 80 3c 2b 00 75 3d eb RSP: 0018:ffffc9000d60f710 EFLAGS: 00010283 RAX: ffffffff83bcc01f RBX: 0000000000000003 RCX: 0000000000100000 RDX: ffffc9000e042000 RSI: 00000000000167e8 RDI: 00000000000167e9 RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff83bcbfdc R10: dffffc0000000000 R11: ffffed100a5b900e R12: ffffffff83bcbfdc R13: dffffc0000000000 R14: 0000000000000018 R15: 0000000000000000 FS: 00007feb037956c0(0000) GS:ffff88808d251000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055d71fc0a290 CR3: 000000004323a000 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+0x92/0x2b0 fs/super.c:1804 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+0x92/0x2b0 fs/super.c:1804 do_new_mount+0x24a/0xa40 fs/namespace.c:3885 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+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7feb029900ca 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:00007feb03794e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007feb03794ef0 RCX: 00007feb029900ca RDX: 00002000000001c0 RSI: 00002000000000c0 RDI: 00007feb03794eb0 RBP: 00002000000001c0 R08: 00007feb03794ef0 R09: 000000000001c005 R10: 000000000001c005 R11: 0000000000000246 R12: 00002000000000c0 R13: 00007feb03794eb0 R14: 000000000000565c R15: 0000200000000240 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:btrfs_root_node+0x7f/0x3b0 fs/btrfs/ctree.c:193 Code: 77 71 e1 fd 48 83 c4 08 e8 4e 8f a9 07 89 c5 31 ff 89 c6 e8 73 a0 03 fe 85 ed 74 17 e8 2a 63 ea fd 84 c0 74 1c e8 21 9c 03 fe <42> 80 3c 2b 00 75 4b eb 51 e8 13 9c 03 fe 42 80 3c 2b 00 75 3d eb RSP: 0018:ffffc9000d60f710 EFLAGS: 00010283 RAX: ffffffff83bcc01f RBX: 0000000000000003 RCX: 0000000000100000 RDX: ffffc9000e042000 RSI: 00000000000167e8 RDI: 00000000000167e9 RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff83bcbfdc R10: dffffc0000000000 R11: ffffed100a5b900e R12: ffffffff83bcbfdc R13: dffffc0000000000 R14: 0000000000000018 R15: 0000000000000000 FS: 00007feb037956c0(0000) GS:ffff88808d251000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055d71fc0a290 CR3: 000000004323a000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 77 71 ja 0x73 2: e1 fd loope 0x1 4: 48 83 c4 08 add $0x8,%rsp 8: e8 4e 8f a9 07 call 0x7a98f5b d: 89 c5 mov %eax,%ebp f: 31 ff xor %edi,%edi 11: 89 c6 mov %eax,%esi 13: e8 73 a0 03 fe call 0xfe03a08b 18: 85 ed test %ebp,%ebp 1a: 74 17 je 0x33 1c: e8 2a 63 ea fd call 0xfdea634b 21: 84 c0 test %al,%al 23: 74 1c je 0x41 25: e8 21 9c 03 fe call 0xfe039c4b * 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 13 9c 03 fe call 0xfe039c4b 38: 42 80 3c 2b 00 cmpb $0x0,(%rbx,%r13,1) 3d: 75 3d jne 0x7c 3f: eb .byte 0xeb