------------[ cut here ]------------
kernfs_put: syz1/memory.events.local: released with incorrect active_ref 0
WARNING: CPU: 0 PID: 12 at fs/kernfs/dir.c:531 kernfs_put.part.0+0x433/0x540
Modules linked in:
CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.19.0-rc4-next-20220701 #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 42 a7 ff 48 8b 14 24 44 89 f1 4c 89 fe 48 c7 c7 a0 58 72 84 e8 97 1c 6c 02 <0f> 0b e9 b9 fc ff ff 48 89 ef e8 8e b6 d9 ff e9 c1 fd ff ff e8 84
RSP: 0018:ffff88800824fbd8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffff88800822d040 RSI: ffffffff812b6848 RDI: ffffed1001049f6d
RBP: ffff88801a27fdd0 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000001 R12: ffff88801a27fd98
R13: ffff88801807a570 R14: 0000000000000000 R15: ffff88801a2f22f8
FS: 0000000000000000(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2db25000 CR3: 000000003a378000 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: 354011
hardirqs last enabled at (354021): [] __up_console_sem+0x78/0x80
hardirqs last disabled at (354032): [] __up_console_sem+0x5d/0x80
softirqs last enabled at (353744): [] __irq_exit_rcu+0x113/0x170
softirqs last disabled at (353605): [] __irq_exit_rcu+0x113/0x170
---[ end trace 0000000000000000 ]---
==================================================================
BUG: KASAN: use-after-free in llist_del_first+0x89/0xa0
Read of size 8 at addr ffff88801a27fe18 by task kworker/0:1/12
CPU: 0 PID: 12 Comm: kworker/0:1 Tainted: G W 5.19.0-rc4-next-20220701 #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 295:
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 12:
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 ffff88801a27fd98
which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 128 bytes inside of
168-byte region [ffff88801a27fd98, ffff88801a27fe40)
The buggy address belongs to the physical page:
page:000000000b0f5369 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1a27f
flags: 0x100000000000200(slab|node=0|zone=1)
raw: 0100000000000200 0000000000000000 dead000000000122 ffff8880080718c0
raw: 0000000000000000 0000000000110011 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff88801a27fd00: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
ffff88801a27fd80: fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88801a27fe00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
^
ffff88801a27fe80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88801a27ff00: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
==================================================================
audit: type=1326 audit(1656772386.134:18): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=4062 comm="syz-executor.7" exe="/syz-executor.7" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f9913b55b19 code=0x0
process 'syz-executor.3' launched './file1' with NULL argv: empty string added
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.6'.
nfs: Unknown parameter '&_me'
netlink: 4 bytes leftover after parsing attributes in process `syz-executor.6'.
nfs: Unknown parameter '&_me'
ata2.00: qc timeout (cmd 0xa0)
ata2: found unknown device (class 0)