BTRFS info (device loop0): balance: start -s
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 1
CPU: 0 UID: 0 PID: 5334 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~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 fail_dump lib/fault-inject.c:73 [inline]
 should_fail_ex+0x414/0x560 lib/fault-inject.c:174
 should_failslab+0xa8/0x100 mm/failslab.c:46
 slab_pre_alloc_hook mm/slub.c:4906 [inline]
 slab_alloc_node mm/slub.c:5239 [inline]
 kmem_cache_alloc_noprof+0x88/0x710 mm/slub.c:5270
 add_delayed_ref+0x118/0x1e70 fs/btrfs/delayed-ref.c:1017
 btrfs_alloc_tree_block+0xcf8/0x1220 fs/btrfs/extent-tree.c:5208
 btrfs_force_cow_block+0x578/0x2410 fs/btrfs/ctree.c:517
 btrfs_cow_block+0x3c4/0xa80 fs/btrfs/ctree.c:708
 btrfs_search_slot+0xd23/0x2ce0 fs/btrfs/ctree.c:2130
 btrfs_update_device+0x130/0x4e0 fs/btrfs/volumes.c:2942
 btrfs_chunk_alloc_add_chunk_item+0x2a9/0x1260 fs/btrfs/volumes.c:5666
 reserve_chunk_space+0x32a/0x5c0 fs/btrfs/block-group.c:4362
 check_system_chunk fs/btrfs/block-group.c:4389 [inline]
 btrfs_inc_block_group_ro+0x626/0x6f0 fs/btrfs/block-group.c:3080
 btrfs_relocate_block_group+0x3f1/0xc70 fs/btrfs/relocation.c:3923
 btrfs_relocate_chunk+0x12f/0x5c0 fs/btrfs/volumes.c:3424
 __btrfs_balance+0x18ff/0x24e0 fs/btrfs/volumes.c:4197
 btrfs_balance+0xac2/0x11b0 fs/btrfs/volumes.c:4571
 btrfs_ioctl_balance+0x3d3/0x610 fs/btrfs/ioctl.c:3525
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7edeb8f7c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7edfa5e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f7edede6090 RCX: 00007f7edeb8f7c9
RDX: 0000200000000200 RSI: 00000000c4009420 RDI: 000000000000000b
RBP: 00007f7edfa5e090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007f7edede6128 R14: 00007f7edede6090 R15: 00007ffda74b9408
 </TASK>
------------[ cut here ]------------
WARNING: fs/btrfs/space-info.h:257 at btrfs_space_info_update_bytes_may_use+0x318/0x600 fs/btrfs/space-info.h:257, CPU#0: syz.0.0/5334
Modules linked in:
CPU: 0 UID: 0 PID: 5334 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~bpo12+1 04/01/2014
RIP: 0010:btrfs_space_info_update_bytes_may_use+0x318/0x600 fs/btrfs/space-info.h:257
Code: 00 00 74 08 4c 89 ff e8 36 ac 32 fe 4d 8b 27 4c 89 e7 48 8b 6c 24 18 48 89 ee e8 a3 03 cb fd 49 39 ec 73 1c e8 39 01 cb fd 90 <0f> 0b 90 31 db 43 80 7c 35 00 00 0f 85 48 ff ff ff e9 4b ff ff ff
RSP: 0018:ffffc9000e46f028 EFLAGS: 00010293
RAX: ffffffff83f604d7 RBX: fffffffffffff000 RCX: ffff888000ab4980
RDX: 0000000000000000 RSI: 0000000000001000 RDI: 0000000000000000
RBP: 0000000000001000 R08: ffffffff8f824177 R09: 1ffffffff1f0482e
R10: dffffc0000000000 R11: fffffbfff1f0482f R12: 0000000000000000
R13: 1ffff1100837f610 R14: dffffc0000000000 R15: ffff888041bfb080
FS:  00007f7edfa5e6c0(0000) GS:ffff88808d416000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055ca72bcf168 CR3: 00000000434fb000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 btrfs_space_info_free_bytes_may_use fs/btrfs/space-info.h:294 [inline]
 block_rsv_release_bytes fs/btrfs/block-rsv.c:153 [inline]
 btrfs_block_rsv_release+0x462/0x570 fs/btrfs/block-rsv.c:290
 btrfs_unuse_block_rsv fs/btrfs/block-rsv.h:100 [inline]
 btrfs_alloc_tree_block+0xda5/0x1220 fs/btrfs/extent-tree.c:5222
 btrfs_force_cow_block+0x578/0x2410 fs/btrfs/ctree.c:517
 btrfs_cow_block+0x3c4/0xa80 fs/btrfs/ctree.c:708
 btrfs_search_slot+0xd23/0x2ce0 fs/btrfs/ctree.c:2130
 btrfs_update_device+0x130/0x4e0 fs/btrfs/volumes.c:2942
 btrfs_chunk_alloc_add_chunk_item+0x2a9/0x1260 fs/btrfs/volumes.c:5666
 reserve_chunk_space+0x32a/0x5c0 fs/btrfs/block-group.c:4362
 check_system_chunk fs/btrfs/block-group.c:4389 [inline]
 btrfs_inc_block_group_ro+0x626/0x6f0 fs/btrfs/block-group.c:3080
 btrfs_relocate_block_group+0x3f1/0xc70 fs/btrfs/relocation.c:3923
 btrfs_relocate_chunk+0x12f/0x5c0 fs/btrfs/volumes.c:3424
 __btrfs_balance+0x18ff/0x24e0 fs/btrfs/volumes.c:4197
 btrfs_balance+0xac2/0x11b0 fs/btrfs/volumes.c:4571
 btrfs_ioctl_balance+0x3d3/0x610 fs/btrfs/ioctl.c:3525
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xec/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7edeb8f7c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f7edfa5e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f7edede6090 RCX: 00007f7edeb8f7c9
RDX: 0000200000000200 RSI: 00000000c4009420 RDI: 000000000000000b
RBP: 00007f7edfa5e090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007f7edede6128 R14: 00007f7edede6090 R15: 00007ffda74b9408
 </TASK>