loop0: detected capacity change from 0 to 32768
BTRFS: device fsid ed167579-eb65-4e76-9a50-61ac97e9b59d devid 1 transid 8 /dev/loop0 (7:0) scanned by syz.0.0 (5322)
BTRFS info (device loop0): first mount of filesystem ed167579-eb65-4e76-9a50-61ac97e9b59d
BTRFS info (device loop0): using sha256 checksum algorithm
BTRFS info (device loop0): rebuilding free space tree
------------[ cut here ]------------
ret == -ENOENT
WARNING: fs/btrfs/extent-tree.c:3418 at __btrfs_free_extent+0x1732/0x4570 fs/btrfs/extent-tree.c:3418, CPU#0: syz.0.0/5322
Modules linked in:
CPU: 0 UID: 0 PID: 5322 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:__btrfs_free_extent+0x1732/0x4570 fs/btrfs/extent-tree.c:3418
Code: 03 00 00 e8 50 5d de fd 4c 8b 7c 24 10 48 8b 5c 24 18 48 8b 44 24 30 4d 89 e5 49 bc 00 00 00 00 00 fc ff df e9 4e 0d 00 00 90 <0f> 0b 90 48 b8 00 00 00 00 00 fc ff df 48 8b 4c 24 28 80 3c 01 00
RSP: 0018:ffffc9000de2ee00 EFLAGS: 00010246
RAX: 0000000000000002 RBX: ffff88801f1bf460 RCX: 0000000000000005
RDX: ffffffff83e7742e RSI: ffffffff8ed5bf40 RDI: 00000000fffffffe
RBP: ffffc9000de2efb0 R08: ffff8880001c4980 R09: 0000000000000002
R10: 00000000fffffffe R11: 0000000000000000 R12: 00000000fffffffe
R13: 00000000fffffffe R14: ffff8880407e3000 R15: 0000000000690000
FS:  00007fd0fa1e06c0(0000) GS:ffff88808ca49000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fffb0212fe8 CR3: 0000000011aa6000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 run_delayed_tree_ref fs/btrfs/extent-tree.c:1824 [inline]
 run_one_delayed_ref fs/btrfs/extent-tree.c:1851 [inline]
 btrfs_run_delayed_refs_for_head fs/btrfs/extent-tree.c:2058 [inline]
 __btrfs_run_delayed_refs+0x1881/0x4780 fs/btrfs/extent-tree.c:2133
 btrfs_run_delayed_refs+0xe6/0x3b0 fs/btrfs/extent-tree.c:2245
 btrfs_start_dirty_block_groups+0xd4c/0x10b0 fs/btrfs/block-group.c:3647
 btrfs_commit_transaction+0x38e/0x31a0 fs/btrfs/transaction.c:2284
 btrfs_rebuild_free_space_tree+0x291/0x6e0 fs/btrfs/free-space-tree.c:1380
 btrfs_start_pre_rw_mount+0x1529/0x1f20 fs/btrfs/disk-io.c:3071
 open_ctree+0x2e07/0x4220 fs/btrfs/disk-io.c:3668
 btrfs_fill_super fs/btrfs/super.c:981 [inline]
 btrfs_get_tree_super fs/btrfs/super.c:1944 [inline]
 btrfs_get_tree_subvol fs/btrfs/super.c:2087 [inline]
 btrfs_get_tree+0x1061/0x1930 fs/btrfs/super.c:2121
 vfs_get_tree+0x92/0x2a0 fs/super.c:1754
 fc_mount fs/namespace.c:1193 [inline]
 do_new_mount_fc fs/namespace.c:3763 [inline]
 do_new_mount+0x341/0xd30 fs/namespace.c:3839
 do_mount fs/namespace.c:4172 [inline]
 __do_sys_mount fs/namespace.c:4361 [inline]
 __se_sys_mount+0x31d/0x420 fs/namespace.c:4338
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd0f939da8a
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd0fa1dfe18 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fd0fa1dfea0 RCX: 00007fd0f939da8a
RDX: 0000200000000240 RSI: 0000200000000440 RDI: 00007fd0fa1dfe60
RBP: 0000200000000240 R08: 00007fd0fa1dfea0 R09: 000000000300000a
R10: 000000000300000a R11: 0000000000000246 R12: 0000200000000440
R13: 00007fd0fa1dfe60 R14: 00000000000055a3 R15: 0000200000000600
 </TASK>