syzbot

BTRFS info (device loop2): last unmount of filesystem 395ef67a-297e-477c-816d-cd80a5b93e5d
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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-executor/5640
Modules linked in:
CPU: 0 UID: 0 PID: 5640 Comm: syz-executor Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
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 b9 51 b1 fd 90 0f 0b 90 e9 eb fe ff ff e8 ab 51 b1 fd 90 0f 0b 90 e9 15 ff ff ff e8 9d 51 b1 fd 90 <0f> 0b 90 e9 46 ff ff ff e8 8f 51 b1 fd 90 0f 0b 90 e9 69 ff ff ff
RSP: 0018:ffffc900030f7aa8 EFLAGS: 00010293
RAX: ffffffff84146dd3 RBX: ffff888054cb8478 RCX: ffff888036495c40
RDX: 0000000000000000 RSI: 0000000000030000 RDI: 0000000000000000
RBP: ffff888054cb8190 R08: ffff8880534df823 R09: 1ffff1100a69bf04
R10: dffffc0000000000 R11: ffffed100a69bf05 R12: ffff888054cb8000
R13: 0000000000000000 R14: 0000000000030000 R15: dffffc0000000000
FS:  0000555560a05500(0000) GS:ffff888125290000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6a255a4000 CR3: 000000005821c000 CR4: 0000000000350ef0
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+0xed/0x480 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: 0033:0x7f225c39e017
Code: a2 c7 05 dc 06 25 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffecbb71d68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f225c432120 RCX: 00007f225c39e017
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffecbb71e20
RBP: 00007ffecbb71e20 R08: 00007ffecbb72e20 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffecbb72eb0
R13: 00007f225c432120 R14: 000000000005adaf R15: 00007ffecbb72ef0
 </TASK>