BTRFS info (device loop1): last unmount of filesystem c9fe44da-de57-406a-8241-57ec7d4412cf
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WARNING: fs/btrfs/block-rsv.c:463 at btrfs_release_global_block_rsv+0x254/0x270 fs/btrfs/block-rsv.c:463, CPU#0: syz.1.125/6534
Modules linked in:
CPU: 0 UID: 0 PID: 6534 Comm: syz.1.125 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:btrfs_release_global_block_rsv+0x254/0x270 fs/btrfs/block-rsv.c:463
Code: 0f 0b 90 e9 e1 fe ff ff e8 29 55 cc fd 90 0f 0b 90 e9 0b ff ff ff e8 1b 55 cc fd 90 0f 0b 90 e9 35 ff ff ff e8 0d 55 cc fd 90 <0f> 0b 90 e9 66 ff ff ff e8 ff 54 cc fd 90 0f 0b 90 eb 88 66 0f 1f
RSP: 0018:ffffc9000e1b7748 EFLAGS: 00010293
RAX: ffffffff83f4b873 RBX: ffff88802706c400 RCX: ffff88805ee80000
RDX: 0000000000000000 RSI: 000000000004f000 RDI: 0000000000000000
RBP: ffff88802706c180 R08: ffff88805e04a823 R09: 1ffff1100bc09504
R10: dffffc0000000000 R11: ffffed100bc09505 R12: dead000000000100
R13: 0000000000000000 R14: 000000000004f000 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888125e1b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f68c5fd6e9c CR3: 0000000030796000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 btrfs_free_block_groups+0xcbf/0xfd0 fs/btrfs/block-group.c:4579
 close_ctree+0x7bc/0x1380 fs/btrfs/disk-io.c:4411
 generic_shutdown_super+0x135/0x2c0 fs/super.c:643
 kill_anon_super+0x3b/0x70 fs/super.c:1289
 btrfs_kill_super+0x41/0x50 fs/btrfs/super.c:2127
 deactivate_locked_super+0xbc/0x130 fs/super.c:474
 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1318
 task_work_run+0x1d4/0x260 kernel/task_work.c:233
 exit_task_work include/linux/task_work.h:40 [inline]
 do_exit+0x694/0x22f0 kernel/exit.c:971
 do_group_exit+0x21c/0x2d0 kernel/exit.c:1112
 get_signal+0x1285/0x1340 kernel/signal.c:3034
 arch_do_signal_or_restart+0x9a/0x7a0 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:75 [inline]
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:270 [inline]
 irqentry_exit_to_user_mode include/linux/irq-entry-common.h:339 [inline]
 irqentry_exit+0x178/0x670 kernel/entry/common.c:196
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0xd6
Code: Unable to access opcode bytes at 0xac.
RSP: 002b:0000200000000518 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007fe1ebbe5fa0 RCX: 00007fe1eb98f749
RDX: 0000200000000540 RSI: 0000200000000510 RDI: 0000000080000000
RBP: 00007fe1eba13f91 R08: 00002000000005c0 R09: 00002000000005c0
R10: 0000200000000580 R11: 0000000000000206 R12: 0000000000000000
R13: 00007fe1ebbe6038 R14: 00007fe1ebbe5fa0 R15: 00007ffc7aff23f8
 </TASK>