------------[ cut here ]------------
kernfs_put: syz0/pids.events: released with incorrect active_ref 0
WARNING: CPU: 0 PID: 6430 at fs/kernfs/dir.c:531 kernfs_put.part.0+0x433/0x540
Modules linked in:
CPU: 0 PID: 6430 Comm: kworker/0:0 Not tainted 5.19.0-rc5-next-20220706 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Workqueue: events kernfs_notify_workfn
RIP: 0010:kernfs_put.part.0+0x433/0x540
Code: 03 80 3c 18 00 0f 85 ea 00 00 00 4d 8b 7d 38 e8 53 fc a6 ff 48 8b 14 24 44 89 f1 4c 89 fe 48 c7 c7 e0 5b 72 84 e8 13 aa 6c 02 <0f> 0b e9 b9 fc ff ff 48 89 ef e8 0e b3 d9 ff e9 c1 fd ff ff e8 04
RSP: 0018:ffff88800f55fbd8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffff888044225040 RSI: ffffffff812bd348 RDI: ffffed1001eabf6d
RBP: ffff888039bcf3d8 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000001 R12: ffff888039bcf3a0
R13: ffff88801b551000 R14: 0000000000000000 R15: ffff888017482410
FS: 0000000000000000(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffdaa080948 CR3: 000000000dbb4000 CR4: 0000000000350ef0
Call Trace:
kernfs_put+0x42/0x50
kernfs_notify_workfn+0x417/0x560
process_one_work+0xa0f/0x1690
worker_thread+0x637/0x1250
kthread+0x2ed/0x3a0
ret_from_fork+0x22/0x30
irq event stamp: 433
hardirqs last enabled at (443): [] __up_console_sem+0x78/0x80
hardirqs last disabled at (454): [] __up_console_sem+0x5d/0x80
softirqs last enabled at (0): [] copy_process+0x1dfa/0x6d60
softirqs last disabled at (0): [<0000000000000000>] 0x0
---[ end trace 0000000000000000 ]---
==================================================================
BUG: KASAN: use-after-free in llist_del_first+0x89/0xa0
Read of size 8 at addr ffff888039bcf420 by task kworker/0:0/6430
CPU: 0 PID: 6430 Comm: kworker/0:0 Tainted: G W 5.19.0-rc5-next-20220706 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Workqueue: events kernfs_notify_workfn
Call Trace:
dump_stack_lvl+0x8b/0xb3
print_report.cold+0x5e/0x5e1
kasan_report+0xb1/0x1b0
llist_del_first+0x89/0xa0
kernfs_notify_workfn+0x78/0x560
process_one_work+0xa0f/0x1690
worker_thread+0x637/0x1250
kthread+0x2ed/0x3a0
ret_from_fork+0x22/0x30
Allocated by task 296:
kasan_save_stack+0x1e/0x40
__kasan_slab_alloc+0x66/0x80
kmem_cache_alloc+0x1b1/0x490
__kernfs_new_node+0xd4/0x8b0
kernfs_new_node+0x93/0x120
__kernfs_create_file+0x51/0x350
cgroup_addrm_files+0x3e2/0x9d0
css_populate_dir+0x19b/0x450
cgroup_apply_control_enable+0x3ae/0xa40
cgroup_mkdir+0x824/0x11f0
kernfs_iop_mkdir+0x149/0x1d0
vfs_mkdir+0x417/0x6a0
do_mkdirat+0x17b/0x2e0
__x64_sys_mkdir+0xf2/0x140
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0
Freed by task 6430:
kasan_save_stack+0x1e/0x40
kasan_set_track+0x21/0x30
kasan_set_free_info+0x20/0x30
__kasan_slab_free+0x108/0x190
kmem_cache_free+0xfb/0x600
kernfs_put.part.0+0x2c7/0x540
kernfs_put+0x42/0x50
kernfs_notify_workfn+0x417/0x560
process_one_work+0xa0f/0x1690
worker_thread+0x637/0x1250
kthread+0x2ed/0x3a0
ret_from_fork+0x22/0x30
The buggy address belongs to the object at ffff888039bcf3a0
which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 128 bytes inside of
168-byte region [ffff888039bcf3a0, ffff888039bcf448)
The buggy address belongs to the physical page:
page:00000000fe51aba6 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x39bcf
flags: 0x100000000000200(slab|node=0|zone=1)
raw: 0100000000000200 0000000000000000 dead000000000122 ffff8880080358c0
raw: 0000000000000000 0000000000110011 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff888039bcf300: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
ffff888039bcf380: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb
>ffff888039bcf400: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc
^
ffff888039bcf480: fc 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff888039bcf500: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc 00 00
==================================================================
------------[ cut here ]------------
WARNING: CPU: 0 PID: 6423 at fs/kernfs/dir.c:504 kernfs_get.part.0+0x69/0x80
Modules linked in:
CPU: 0 PID: 6423 Comm: syz-executor.0 Tainted: G B W 5.19.0-rc5-next-20220706 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
RIP: 0010:kernfs_get.part.0+0x69/0x80
Code: 31 ff 89 ee e8 a8 fd a6 ff 85 ed 74 18 e8 cf 00 a7 ff be 04 00 00 00 48 89 df e8 d2 ba d9 ff f0 ff 03 5b 5d c3 e8 b7 00 a7 ff <0f> 0b eb df 48 89 df e8 7b b7 d9 ff eb c6 66 0f 1f 84 00 00 00 00
RSP: 0018:ffff8880441c7a40 EFLAGS: 00010093
RAX: 0000000000000000 RBX: ffff888039bcf3a0 RCX: 0000000000000000
RDX: ffff888044959ac0 RSI: ffffffff819df849 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R13: 1ffffffff0a01e40 R14: ffff888039bcf3a0 R15: ffff88800e9b5930
FS: 000055555587b400(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffdaa080948 CR3: 000000000dbb4000 CR4: 0000000000350ef0
Call Trace:
kernfs_get+0x1b/0x30
kernfs_notify+0x180/0x350
cgroup_file_notify+0xf5/0x1a0
pids_can_fork+0x22f/0x370
cgroup_can_fork+0x332/0x11b0
copy_process+0x4023/0x6d60
kernel_clone+0xe7/0xa60
__do_sys_clone+0xba/0x100
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f85ae838f41
Code: 48 85 ff 74 3d 48 85 f6 74 38 48 83 ee 10 48 89 4e 08 48 89 3e 48 89 d7 4c 89 c2 4d 89 c8 4c 8b 54 24 08 b8 38 00 00 00 0f 05 <48> 85 c0 7c 13 74 01 c3 31 ed 58 5f ff d0 48 89 c7 b8 3c 00 00 00
RSP: 002b:00007ffe16773758 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f85abd8c700 RCX: 00007f85ae838f41
RDX: 00007f85abd8c9d0 RSI: 00007f85abd8c2f0 RDI: 00000000003d0f00
RBP: 00007ffe16773990 R08: 00007f85abd8c700 R09: 00007f85abd8c700
R10: 00007f85abd8c9d0 R11: 0000000000000206 R12: 00007ffe1677380e
R13: 00007ffe1677380f R14: 00007f85abd8c300 R15: 000055555587cd50
irq event stamp: 6838
hardirqs last enabled at (6837): [] _raw_spin_unlock_irqrestore+0x28/0x50
hardirqs last disabled at (6838): [] __schedule+0x11d9/0x24a0
softirqs last enabled at (6802): [] fpu_clone+0x3be/0xb00
softirqs last disabled at (6800): [] fpu_clone+0x331/0xb00
---[ end trace 0000000000000000 ]---
------------[ cut here ]------------
sysfs group 'power' not found for kobject 'loop0'
WARNING: CPU: 0 PID: 6628 at fs/sysfs/group.c:278 sysfs_remove_group+0x126/0x170
Modules linked in:
CPU: 0 PID: 6628 Comm: syz-executor.3 Tainted: G B W 5.19.0-rc5-next-20220706 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
RIP: 0010:sysfs_remove_group+0x126/0x170
Code: 48 89 d9 49 8b 14 24 48 b8 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 01 00 75 37 48 8b 33 48 c7 c7 80 73 72 84 e8 60 ac 6b 02 <0f> 0b eb 98 e8 61 b5 d8 ff e9 01 ff ff ff 48 89 df e8 54 b5 d8 ff
RSP: 0018:ffff88800cce7cf0 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffffffff8499d3a0 RCX: 0000000000000000
RDX: 0000000000040000 RSI: ffffffff812bd348 RDI: ffffed100199cf90
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff888007c540c8
R13: ffffffff8499d940 R14: ffff888007c54080 R15: ffff88800f36e220
FS: 00007ff9dbd33700(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff25bb18a8 CR3: 000000000e40a000 CR4: 0000000000350ef0
Call Trace:
dpm_sysfs_remove+0x97/0xb0
device_del+0x20c/0xfc0
del_gendisk+0x65a/0xa50
loop_control_ioctl+0x44d/0x620
__x64_sys_ioctl+0x196/0x210
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7ff9de7bdb19
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff9dbd33188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ff9de8d0f60 RCX: 00007ff9de7bdb19
RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000005
RBP: 00007ff9de817f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffec4a098cf R14: 00007ff9dbd33300 R15: 0000000000022000
irq event stamp: 0
hardirqs last enabled at (0): [<0000000000000000>] 0x0
hardirqs last disabled at (0): [] copy_process+0x1db6/0x6d60
softirqs last enabled at (0): [] copy_process+0x1dfa/0x6d60
softirqs last disabled at (0): [<0000000000000000>] 0x0
---[ end trace 0000000000000000 ]---