------------[ cut here ]------------
kernfs_put: syz2/memory.events: 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-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:ffff88800824fbd8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffff88800822d040 RSI: ffffffff812bd348 RDI: ffffed1001049f6d
RBP: ffff8880095723d8 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff8880095723a0
R13: ffff888017cd2ae0 R14: 0000000000000000 R15: ffff88801d6f6460
FS: 0000000000000000(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020003038 CR3: 000000003bc50000 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: 214957
hardirqs last enabled at (214967): [] __up_console_sem+0x78/0x80
hardirqs last disabled at (214978): [] __up_console_sem+0x5d/0x80
softirqs last enabled at (214856): [] __irq_exit_rcu+0x113/0x170
softirqs last disabled at (214803): [] __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 ffff888009572420 by task kworker/0:1/12
CPU: 0 PID: 12 Comm: kworker/0:1 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 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
------------[ cut here ]------------
The buggy address belongs to the object at ffff8880095723a0
which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 128 bytes inside of
168-byte region [ffff8880095723a0, ffff888009572448)
WARNING: CPU: 1 PID: 4086 at fs/kernfs/dir.c:504 kernfs_get.part.0+0x69/0x80
The buggy address belongs to the physical page:
Modules linked in:
page:000000000c65a6ec refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x9572
CPU: 1 PID: 4086 Comm: syz-executor.2 Tainted: G W 5.19.0-rc5-next-20220706 #1
flags: 0x100000000000200(slab|node=0|zone=1)
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
raw: 0100000000000200 0000000000000000 dead000000000122 ffff8880080358c0
RIP: 0010:kernfs_get.part.0+0x69/0x80
raw: 0000000000000000 0000000000110011 00000001ffffffff 0000000000000000
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
page dumped because: kasan: bad access detected
RSP: 0018:ffff888044cd7a58 EFLAGS: 00010016
Memory state around the buggy address:
RAX: 00000000000156ca RBX: ffff8880095723a0 RCX: ffffc900023d9000
ffff888009572300: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
RDX: 0000000000040000 RSI: ffffffff819df849 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
ffff888009572380: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
>ffff888009572400: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc
R13: 1ffffffff0a01e40 R14: ffff8880095723a0 R15: ffff888043c68490
^
FS: 00007f9bcbb4f700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
ffff888009572480: fc 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
ffff888009572500: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc 00 00
CR2: 00007f2d3c035068 CR3: 0000000042398000 CR4: 0000000000350ee0
==================================================================
Call Trace:
kernfs_get+0x1b/0x30
kernfs_notify+0x180/0x350
cgroup_file_notify+0xf5/0x1a0
try_charge_memcg+0x46c/0x1440
mem_cgroup_charge_skmem+0x7c/0x1b0
sock_setsockopt+0x2080/0x34a0
__sys_setsockopt+0x258/0x2a0
__x64_sys_setsockopt+0xba/0x150
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f9bce5d9b19
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:00007f9bcbb4f188 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f9bce6ecf60 RCX: 00007f9bce5d9b19
RDX: 0000000000000049 RSI: 0000000000000001 RDI: 0000000000000004
RBP: 00007f9bce633f6d R08: 0000000000000010 R09: 0000000000000000
R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe26c4e0af R14: 00007f9bcbb4f300 R15: 0000000000022000
irq event stamp: 13500
hardirqs last enabled at (13499): [] asm_sysvec_apic_timer_interrupt+0x1b/0x20
hardirqs last disabled at (13500): [] _raw_spin_lock_irqsave+0x4e/0x50
softirqs last enabled at (13132): [] __irq_exit_rcu+0x113/0x170
softirqs last disabled at (13061): [] __irq_exit_rcu+0x113/0x170
---[ end trace 0000000000000000 ]---
syz-executor.6 (4105) used greatest stack depth: 24024 bytes left
loop6: detected capacity change from 0 to 40
syz-executor.6: attempt to access beyond end of device
loop6: rw=2049, sector=40, nr_sectors = 4 limit=40
Buffer I/O error on dev loop6, logical block 10, lost async page write