loop0: detected capacity change from 0 to 32768
BTRFS: device fsid c9fe44da-de57-406a-8241-57ec7d4412cf devid 1 transid 8 /dev/loop0 (7:0) scanned by syz.0.0 (5327)
BTRFS info (device loop0): first mount of filesystem c9fe44da-de57-406a-8241-57ec7d4412cf
BTRFS info (device loop0): using crc32c (crc32c-lib) checksum algorithm
BTRFS warning (device loop0): space cache v1 is being deprecated and will be removed in a future release, please use -o space_cache=v2
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): setting nodatasum
BTRFS info (device loop0): setting nodatacow
BTRFS info (device loop0): enabling ssd optimizations
BTRFS info (device loop0): disabling tree log
BTRFS info (device loop0): enabling disk space caching
BTRFS info (device loop0): force clearing of disk cache
FAULT_INJECTION: forcing a failure.
name failslab, interval 1, probability 0, space 0, times 1
CPU: 0 UID: 0 PID: 5327 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+0x189/0x250 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:4899 [inline]
 slab_alloc_node mm/slub.c:5221 [inline]
 kmem_cache_alloc_noprof+0x74/0x6e0 mm/slub.c:5252
 __kernfs_new_node+0xd7/0x7e0 fs/kernfs/dir.c:637
 kernfs_new_node+0x102/0x210 fs/kernfs/dir.c:713
 kernfs_create_dir_ns+0x44/0x130 fs/kernfs/dir.c:1083
 sysfs_create_dir_ns+0x123/0x280 fs/sysfs/dir.c:59
 create_dir lib/kobject.c:73 [inline]
 kobject_add_internal+0x59f/0xb40 lib/kobject.c:240
 kobject_add_varg lib/kobject.c:374 [inline]
 kobject_init_and_add+0x125/0x190 lib/kobject.c:457
 btrfs_sysfs_add_qgroups+0x111/0x2b0 fs/btrfs/sysfs.c:2645
 btrfs_quota_enable+0x25d/0x2920 fs/btrfs/qgroup.c:1022
 btrfs_ioctl_quota_ctl+0x183/0x1c0 fs/btrfs/ioctl.c:3667
 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+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1d9fb8eec9
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:00007f1da09db038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f1d9fde5fa0 RCX: 00007f1d9fb8eec9
RDX: 0000200000000040 RSI: 00000000c0109428 RDI: 0000000000000004
RBP: 00007f1da09db090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007f1d9fde6038 R14: 00007f1d9fde5fa0 R15: 00007ffe05b1d938
 </TASK>
kobject: kobject_add_internal failed for qgroups (error: -12 parent: c9fe44da-de57-406a-8241-57ec7d4412cf)
------------[ cut here ]------------
kernfs: can not remove 'enabled', no directory
WARNING: CPU: 0 PID: 5327 at fs/kernfs/dir.c:1707 kernfs_remove_by_name_ns+0xd1/0x130 fs/kernfs/dir.c:1706
Modules linked in:
CPU: 0 UID: 0 PID: 5327 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:kernfs_remove_by_name_ns+0xd1/0x130 fs/kernfs/dir.c:1706
Code: 4c 89 f7 e8 c1 f2 ff ff 4c 89 f7 e8 69 9b ff ff 31 ed eb 2b e8 30 b0 5d ff 90 48 c7 c7 c0 79 7c 8b 4c 89 f6 e8 90 bd 20 ff 90 <0f> 0b 90 90 bd fe ff ff ff eb 12 e8 0f b0 5d ff bd fe ff ff ff 48
RSP: 0018:ffffc9000d1afaf0 EFLAGS: 00010246
RAX: 27ed363da6293000 RBX: ffffffff8baef260 RCX: ffff888032e20000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: dffffc0000000000 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1bfa658 R12: 0000000000000000
R13: ffffffff8e6ee9c0 R14: ffffffff8baef2c0 R15: 0000000000000000
FS:  00007f1da09db6c0(0000) GS:ffff88808d306000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1d959ff000 CR3: 00000000111a3000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 kernfs_remove_by_name include/linux/kernfs.h:633 [inline]
 remove_files fs/sysfs/group.c:28 [inline]
 sysfs_remove_group+0xfc/0x2c0 fs/sysfs/group.c:322
 sysfs_remove_groups+0x54/0xb0 fs/sysfs/group.c:346
 __kobject_del+0x84/0x300 lib/kobject.c:595
 kobject_del+0x45/0x60 lib/kobject.c:627
 btrfs_sysfs_del_qgroups+0x115/0x160 fs/btrfs/sysfs.c:2620
 btrfs_sysfs_add_qgroups+0x286/0x2b0 fs/btrfs/sysfs.c:2659
 btrfs_quota_enable+0x25d/0x2920 fs/btrfs/qgroup.c:1022
 btrfs_ioctl_quota_ctl+0x183/0x1c0 fs/btrfs/ioctl.c:3667
 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+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1d9fb8eec9
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:00007f1da09db038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f1d9fde5fa0 RCX: 00007f1d9fb8eec9
RDX: 0000200000000040 RSI: 00000000c0109428 RDI: 0000000000000004
RBP: 00007f1da09db090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007f1d9fde6038 R14: 00007f1d9fde5fa0 R15: 00007ffe05b1d938
 </TASK>