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 (5329)
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
BTRFS info (device loop0): disabling free space tree
BTRFS info (device loop0): clearing compat-ro feature flag for FREE_SPACE_TREE (0x1)
BTRFS info (device loop0): clearing compat-ro feature flag for FREE_SPACE_TREE_VALID (0x2)
BTRFS info (device loop0): enabling ssd optimizations
BTRFS info (device loop0): turning on async discard
BTRFS info (device loop0): force clearing of disk cache
BTRFS info (device loop0): enabling auto defrag
BTRFS info (device loop0): max_inline set to 60
BTRFS info (device loop0): last unmount of filesystem ed167579-eb65-4e76-9a50-61ac97e9b59d
------------[ cut here ]------------
fs_info->delayed_refs_rsv.reserved > 0
WARNING: fs/btrfs/block-rsv.c:472 at btrfs_release_global_block_rsv+0x2e4/0x300 fs/btrfs/block-rsv.c:472, CPU#0: syz.0.0/5329
Modules linked in:
CPU: 0 UID: 0 PID: 5329 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_release_global_block_rsv+0x2e4/0x300 fs/btrfs/block-rsv.c:472
Code: 0f 0b 90 e9 c1 fe ff ff e8 39 b6 af fd 90 0f 0b 90 e9 eb fe ff ff e8 2b b6 af fd 90 0f 0b 90 e9 15 ff ff ff e8 1d b6 af fd 90 <0f> 0b 90 e9 46 ff ff ff e8 0f b6 af fd 90 0f 0b 90 e9 69 ff ff ff
RSP: 0018:ffffc90005a2faa8 EFLAGS: 00010283
RAX: ffffffff84161b23 RBX: ffff88803fa74478 RCX: 0000000000100000
RDX: ffffc90020802000 RSI: 0000000000010a48 RDI: 0000000000010a49
RBP: ffff88803fa74190 R08: ffff88803fa7f023 R09: 1ffff11007f4fe04
R10: dffffc0000000000 R11: ffffed1007f4fe05 R12: ffff88803fa74000
R13: 0000000000000000 R14: 0000000000008000 R15: dffffc0000000000
FS:  00007f9796b146c0(0000) GS:ffff88808c881000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7dc56ad218 CR3: 000000003434a000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 btrfs_free_block_groups+0xdf0/0x1090 fs/btrfs/block-group.c:4756
 close_ctree+0x7f3/0x12d0 fs/btrfs/disk-io.c:4458
 generic_shutdown_super+0x13d/0x2d0 fs/super.c:646
 kill_anon_super+0x3b/0x70 fs/super.c:1292
 btrfs_kill_super+0x41/0x50 fs/btrfs/super.c:2127
 deactivate_locked_super+0xbc/0x130 fs/super.c:476
 cleanup_mnt+0x437/0x4d0 fs/namespace.c:1312
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
 exit_to_user_mode_loop+0xf3/0x4d0 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:318 [inline]
 do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9795b9ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007f9796b13fe8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f9795e15fa0 RCX: 00007f9795b9ce59
RDX: 0200000000000000 RSI: ffffffffffffffff RDI: 0000000000000003
RBP: 00007f9795c32d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9795e16038 R14: 00007f9795e15fa0 R15: 00007ffda1641e78
 </TASK>