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 disk space caching
BTRFS info (device loop0): force clearing of disk cache
BTRFS info (device loop0): trying to use backup root at mount time
BTRFS info (device loop0): force lzo compression, level 1
BTRFS info (device loop0): balance: start -d -m
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 1
CPU: 0 UID: 0 PID: 5318 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
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 fail_dump lib/fault-inject.c:73 [inline]
 should_fail_ex+0x412/0x560 lib/fault-inject.c:174
 should_failslab+0xa8/0x100 mm/failslab.c:46
 slab_pre_alloc_hook mm/slub.c:4468 [inline]
 slab_alloc_node mm/slub.c:4821 [inline]
 kmem_cache_alloc_noprof+0x87/0x650 mm/slub.c:4851
 add_delayed_ref+0x118/0x1f00 fs/btrfs/delayed-ref.c:1017
 btrfs_alloc_tree_block+0xd27/0x1280 fs/btrfs/extent-tree.c:5328
 btrfs_force_cow_block+0x58c/0x2510 fs/btrfs/ctree.c:503
 btrfs_cow_block+0x3c4/0xa90 fs/btrfs/ctree.c:694
 btrfs_search_slot+0xd20/0x2d20 fs/btrfs/ctree.c:2116
 btrfs_update_device+0x13b/0x4f0 fs/btrfs/volumes.c:3067
 btrfs_chunk_alloc_add_chunk_item+0x2b2/0x1290 fs/btrfs/volumes.c:5975
 do_chunk_alloc fs/btrfs/block-group.c:4052 [inline]
 btrfs_chunk_alloc+0x9ce/0x15e0 fs/btrfs/block-group.c:4347
 btrfs_inc_block_group_ro+0x415/0x6f0 fs/btrfs/block-group.c:3126
 btrfs_relocate_block_group+0x39b/0xae0 fs/btrfs/relocation.c:5350
 btrfs_relocate_chunk+0x10f/0x810 fs/btrfs/volumes.c:3590
 __btrfs_balance+0x1dab/0x2ae0 fs/btrfs/volumes.c:4492
 btrfs_balance+0xafa/0x11f0 fs/btrfs/volumes.c:4879
 btrfs_ioctl_balance+0x3d3/0x610 fs/btrfs/ioctl.c:3445
 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+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fab1b79c799
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:00007fab1c5e6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fab1ba15fa0 RCX: 00007fab1b79c799
RDX: 0000200000000180 RSI: 00000000c4009420 RDI: 0000000000000004
RBP: 00007fab1c5e6090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007fab1ba16038 R14: 00007fab1ba15fa0 R15: 00007fffa790f038
 </TASK>
BTRFS error (device loop0 state A): Transaction aborted (error -12)
BTRFS: error (device loop0 state A) in do_chunk_alloc:4122: errno=-12 Out of memory
BTRFS info (device loop0 state EA): forced readonly
------------[ cut here ]------------
1
WARNING: fs/btrfs/space-info.h:257 at btrfs_space_info_update_bytes_may_use+0x318/0x6b0 fs/btrfs/space-info.h:257, CPU#0: syz.0.0/5318
Modules linked in:
CPU: 0 UID: 0 PID: 5318 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_space_info_update_bytes_may_use+0x318/0x6b0 fs/btrfs/space-info.h:257
Code: 00 00 74 08 4c 89 ff e8 46 6d 1f fe 4d 8b 27 4c 89 e7 48 8b 6c 24 18 48 89 ee e8 e3 bb b3 fd 49 39 ec 73 1c e8 79 b9 b3 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:ffffc9000e1777c0 EFLAGS: 00010293
RAX: ffffffff8411e1f7 RBX: fffffffffffe8000 RCX: ffff8880002ca480
RDX: 0000000000000000 RSI: 0000000000018000 RDI: 0000000000017000
RBP: 0000000000018000 R08: ffffffff9011aeb7 R09: 1ffffffff20235d6
R10: dffffc0000000000 R11: fffffbfff20235d7 R12: 0000000000017000
R13: 1ffff1100865ea10 R14: dffffc0000000000 R15: ffff8880432f5080
FS:  00007fab1c5e66c0(0000) GS:ffff88808ca59000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fab1c54d9d0 CR3: 0000000043810000 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+0x47b/0x590 fs/btrfs/block-rsv.c:291
 btrfs_trans_release_chunk_metadata+0x7f/0xb0 fs/btrfs/transaction.c:261
 do_chunk_alloc fs/btrfs/block-group.c:4126 [inline]
 btrfs_chunk_alloc+0xf4c/0x15e0 fs/btrfs/block-group.c:4347
 btrfs_inc_block_group_ro+0x415/0x6f0 fs/btrfs/block-group.c:3126
 btrfs_relocate_block_group+0x39b/0xae0 fs/btrfs/relocation.c:5350
 btrfs_relocate_chunk+0x10f/0x810 fs/btrfs/volumes.c:3590
 __btrfs_balance+0x1dab/0x2ae0 fs/btrfs/volumes.c:4492
 btrfs_balance+0xafa/0x11f0 fs/btrfs/volumes.c:4879
 btrfs_ioctl_balance+0x3d3/0x610 fs/btrfs/ioctl.c:3445
 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+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fab1b79c799
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:00007fab1c5e6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fab1ba15fa0 RCX: 00007fab1b79c799
RDX: 0000200000000180 RSI: 00000000c4009420 RDI: 0000000000000004
RBP: 00007fab1c5e6090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002
R13: 00007fab1ba16038 R14: 00007fab1ba15fa0 R15: 00007fffa790f038
 </TASK>