------------[ cut here ]------------
kernfs_put: syz2/memory.events: released with incorrect active_ref 0
WARNING: CPU: 0 PID: 3724 at fs/kernfs/dir.c:531 kernfs_put.part.0+0x433/0x540
Modules linked in:
CPU: 0 PID: 3724 Comm: kworker/0:4 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
------------[ cut here ]------------
RSP: 0018:ffff8880453c7bd8 EFLAGS: 00010286
WARNING: CPU: 1 PID: 6021 at fs/kernfs/dir.c:504 kernfs_get.part.0+0x69/0x80
Modules linked in:
CPU: 1 PID: 6021 Comm: syz-executor.2 Not tainted 5.19.0-rc4-next-20220701 #1
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
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
RDX: ffff88800d811ac0 RSI: ffffffff812b6848 RDI: ffffed1008a78f6d
Code: 31 ff 89 ee e8 a8 43 a7 ff 85 ed 74 18 e8 cf 46 a7 ff be 04 00 00 00 48 89 df e8 52 be d9 ff f0 ff 03 5b 5d c3 e8 b7 46 a7 ff <0f> 0b eb df 48 89 df e8 fb ba d9 ff eb c6 66 0f 1f 84 00 00 00 00
RBP: ffff888017461eb8 R08: 0000000000000005 R09: 0000000000000000
RSP: 0018:ffff88806cf09c80 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff888017461e80 RCX: 0000000000000100
R10: 0000000080000000 R11: 0000000000000001 R12: ffff888017461e80
RDX: ffff88800f5c0000 RSI: ffffffff819d2579 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R13: 1ffffffff0a01e40 R14: ffff888017461e80 R15: ffff8880456ec490
FS: 00007ff0b1e3d700(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
R13: ffff8880089ed658 R14: 0000000000000000 R15: ffff88800d4e1870
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
FS: 0000000000000000(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CR2: 00007f8368b9f3f8 CR3: 0000000016cd4000 CR4: 0000000000350ee0
Call Trace:
kernfs_get+0x1b/0x30
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
kernfs_notify+0x180/0x350
cgroup_file_notify+0xf5/0x1a0
CR2: 0000555557424cd8 CR3: 0000000041f4c000 CR4: 0000000000350ef0
Call Trace:
call_timer_fn+0x17d/0x5f0
kernfs_put+0x42/0x50
kernfs_notify_workfn+0x417/0x560
__run_timers.part.0+0x65e/0xa50
process_one_work+0xa0f/0x1690
run_timer_softirq+0xae/0x1a0
__do_softirq+0x1c8/0x8cc
worker_thread+0x637/0x1250
__irq_exit_rcu+0x113/0x170
irq_exit_rcu+0x5/0x20
kthread+0x2ed/0x3a0
sysvec_apic_timer_interrupt+0x8e/0xc0
asm_sysvec_apic_timer_interrupt+0x1b/0x20
RIP: 0010:lock_is_held_type+0xf8/0x130
ret_from_fork+0x22/0x30
Code: 20 ca 66 84 e8 79 0c 00 00 b8 ff ff ff ff 65 0f c1 05 34 bc e9 7b 83 f8 01 75 22 48 f7 04 24 00 02 00 00 74 01 fb 48 83 c4 08 <44> 89 e8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 45 31 ed eb c0 0f 0b 48
RSP: 0018:ffff888020247460 EFLAGS: 00000296
RAX: 0000000000000001 RBX: 0000000000000003 RCX: 0000000000000001
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffffff852048e0 R08: 0000000000000000 R09: ffffffff858e9257
R10: fffffbfff0b1d24a R11: 0000000000000001 R12: ffff88800f5c0000
irq event stamp: 590527
R13: 0000000000000000 R14: 00000000ffffffff R15: ffff88800f5c09c8
rcu_read_lock_sched_held+0x3a/0x70
hardirqs last enabled at (590537): [] console_emit_next_record.constprop.0+0x648/0x800
lock_release+0x543/0x750
hardirqs last disabled at (590546): [] console_emit_next_record.constprop.0+0x667/0x800
softirqs last enabled at (590034): [] srcu_invoke_callbacks+0x1e5/0x3a0
list_lru_count_one+0x159/0x2e0
softirqs last disabled at (590030): [] srcu_invoke_callbacks+0x1b5/0x3a0
super_cache_count+0x1b7/0x2f0
---[ end trace 0000000000000000 ]---
do_shrink_slab+0x83/0xb00
==================================================================
BUG: KASAN: use-after-free in llist_del_first+0x89/0xa0
Read of size 8 at addr ffff888017461f00 by task kworker/0:4/3724
shrink_slab+0x3d7/0x6e0
CPU: 0 PID: 3724 Comm: kworker/0:4 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
shrink_node+0x892/0x1d10
Call Trace:
do_try_to_free_pages+0x3c7/0x1670
dump_stack_lvl+0x8b/0xb3
print_report.cold+0x5e/0x5e1
try_to_free_mem_cgroup_pages+0x304/0x880
kasan_report+0xb1/0x1b0
llist_del_first+0x89/0xa0
try_charge_memcg+0x4c2/0x13c0
kernfs_notify_workfn+0x78/0x560
process_one_work+0xa0f/0x1690
mem_cgroup_charge_skmem+0x7c/0x1b0
worker_thread+0x637/0x1250
sock_setsockopt+0x2080/0x34a0
kthread+0x2ed/0x3a0
ret_from_fork+0x22/0x30
Allocated by task 299:
__sys_setsockopt+0x258/0x2a0
kasan_save_stack+0x1e/0x40
__kasan_slab_alloc+0x66/0x80
kmem_cache_alloc+0x1b1/0x490
__x64_sys_setsockopt+0xba/0x150
__kernfs_new_node+0xd4/0x8b0
kernfs_new_node+0x93/0x120
do_syscall_64+0x3b/0x90
__kernfs_create_file+0x51/0x350
entry_SYSCALL_64_after_hwframe+0x46/0xb0
cgroup_addrm_files+0x3e2/0x9d0
RIP: 0033:0x7ff0b48c7b19
css_populate_dir+0x19b/0x450
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
cgroup_apply_control_enable+0x3ae/0xa40
RSP: 002b:00007ff0b1e3d188 EFLAGS: 00000246
cgroup_mkdir+0x824/0x11f0
ORIG_RAX: 0000000000000036
kernfs_iop_mkdir+0x149/0x1d0
RAX: ffffffffffffffda RBX: 00007ff0b49daf60 RCX: 00007ff0b48c7b19
vfs_mkdir+0x417/0x6a0
RDX: 0000000000000049 RSI: 0000000000000001 RDI: 0000000000000009
do_mkdirat+0x17b/0x2e0
RBP: 00007ff0b4921f6d R08: 0000000000000010 R09: 0000000000000000
__x64_sys_mkdir+0xf2/0x140
R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000000
do_syscall_64+0x3b/0x90
R13: 00007ffe974dcfcf R14: 00007ff0b1e3d300 R15: 0000000000022000
entry_SYSCALL_64_after_hwframe+0x46/0xb0
irq event stamp: 7761
Freed by task 3724:
hardirqs last enabled at (7760): [] asm_sysvec_apic_timer_interrupt+0x1b/0x20
kasan_save_stack+0x1e/0x40
hardirqs last disabled at (7761): [] _raw_spin_lock_irqsave+0x4e/0x50
kasan_set_track+0x21/0x30
softirqs last enabled at (7582): [] __irq_exit_rcu+0x113/0x170
kasan_set_free_info+0x20/0x30
softirqs last disabled at (7747): [] __irq_exit_rcu+0x113/0x170
__kasan_slab_free+0x108/0x190
---[ end trace 0000000000000000 ]---
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 ffff888017461e80
which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 128 bytes inside of
168-byte region [ffff888017461e80, ffff888017461f28)
The buggy address belongs to the physical page:
page:00000000dd06b30a refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x17461
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:
ffff888017461e00: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
ffff888017461e80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888017461f00: fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc
^
ffff888017461f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888017462000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
kmemleak: 140 new suspected memory leaks (see /sys/kernel/debug/kmemleak)
----------------
Code disassembly (best guess):
0: 20 ca and %cl,%dl
2: 66 84 e8 data16 test %ch,%al
5: 79 0c jns 0x13
7: 00 00 add %al,(%rax)
9: b8 ff ff ff ff mov $0xffffffff,%eax
e: 65 0f c1 05 34 bc e9 xadd %eax,%gs:0x7be9bc34(%rip) # 0x7be9bc4a
15: 7b
16: 83 f8 01 cmp $0x1,%eax
19: 75 22 jne 0x3d
1b: 48 f7 04 24 00 02 00 testq $0x200,(%rsp)
22: 00
23: 74 01 je 0x26
25: fb sti
26: 48 83 c4 08 add $0x8,%rsp
* 2a: 44 89 e8 mov %r13d,%eax <-- trapping instruction
2d: 5b pop %rbx
2e: 5d pop %rbp
2f: 41 5c pop %r12
31: 41 5d pop %r13
33: 41 5e pop %r14
35: 41 5f pop %r15
37: c3 retq
38: 45 31 ed xor %r13d,%r13d
3b: eb c0 jmp 0xfffffffd
3d: 0f 0b ud2
3f: 48 rex.W