------------[ cut here ]------------
kernfs_put: syz1/memory.events: released with incorrect active_ref 0
WARNING: CPU: 0 PID: 9686 at fs/kernfs/dir.c:531 kernfs_put.part.0+0x433/0x540
Modules linked in:
CPU: 0 PID: 9686 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:ffff888045387bd8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffff88804789b580 RSI: ffffffff812bd348 RDI: ffffed1008a70f6d
RBP: ffff88800d5f0038 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000001 R12: ffff88800d5f0000
R13: ffff8880454f6740 R14: 0000000000000000 R15: ffff888041ad7500
FS: 0000000000000000(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffeb8e9eed8 CR3: 0000000032886000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
------------[ cut here ]------------
Call Trace:
kernfs_put+0x42/0x50
kernfs_notify_workfn+0x417/0x560
WARNING: CPU: 1 PID: 112 at fs/kernfs/dir.c:504 kernfs_get.part.0+0x69/0x80
Modules linked in:
CPU: 1 PID: 112 Comm: systemd-journal 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
process_one_work+0xa0f/0x1690
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: 0000:ffff88806cf09c80 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff88800d5f0000 RCX: 0000000000000100
RDX: ffff88800fb31ac0 RSI: ffffffff819df849 RDI: 0000000000000005
worker_thread+0x637/0x1250
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R13: 1ffffffff0a01e40 R14: ffff88800d5f0000 R15: ffff88804501c490
FS: 00007ff7fb3b6900(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
kthread+0x2ed/0x3a0
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff7fa7ded20 CR3: 000000000ece4000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
ret_from_fork+0x22/0x30
Call Trace:
kernfs_get+0x1b/0x30
kernfs_notify+0x180/0x350
irq event stamp: 41321
cgroup_file_notify+0xf5/0x1a0
hardirqs last enabled at (41331): [] console_emit_next_record.constprop.0+0x648/0x800
hardirqs last disabled at (41342): [] sysvec_apic_timer_interrupt+0xb/0xc0
call_timer_fn+0x17d/0x5f0
softirqs last enabled at (40658): [] __irq_exit_rcu+0x113/0x170
softirqs last disabled at (40649): [] __irq_exit_rcu+0x113/0x170
---[ end trace 0000000000000000 ]---
__run_timers.part.0+0x65e/0xa50
run_timer_softirq+0xae/0x1a0
__do_softirq+0x1c8/0x8cc
__irq_exit_rcu+0x113/0x170
irq_exit_rcu+0x5/0x20
sysvec_apic_timer_interrupt+0x8e/0xc0
asm_sysvec_apic_timer_interrupt+0x1b/0x20
RIP: 0010:handle_mm_fault+0x1a9/0xa10
Code: 31 ff 4c 89 f6 e8 47 07 dc ff 4d 85 f6 0f 85 46 05 00 00 e8 49 0a dc ff ba 01 00 00 00 be 14 00 00 00 4c 89 e7 e8 57 ca 10 00 32 0a dc ff e8 9d 8e c7 ff 31 ff 41 89 c4 89 c6 e8 b1 06 dc ff
RSP: 0000:ffff88800db5fe70 EFLAGS: 00000206
RAX: 00000000001180a3 RBX: 0000000000000255 RCX: ffffffff8128d13f
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88800db08270 R08: 0000000000000001 R09: ffffffff86a607ef
R10: fffffbfff0d4c0fd R11: 0000000000000001 R12: ffff88800e368000
R13: 00007ff7fa7ded20 R14: 0000000000000200 R15: ffff88801714b100
do_user_addr_fault+0x536/0x1300
exc_page_fault+0x98/0x1a0
asm_exc_page_fault+0x27/0x30
RIP: 0033:0x7ff7fbf3aace
Code: 40 38 00 00 00 00 4c 89 e8 48 f7 f1 48 8b 85 d8 00 00 00 48 c1 e2 04 48 01 d0 49 89 d5 48 8b 50 08 48 85 d2 0f 85 32 03 00 00 <4c> 89 00 48 8b 85 d8 00 00 00 4e 89 44 28 08 48 8b 85 d0 00 00 00
RSP: 002b:00007ffefe48acc0 EFLAGS: 00010246
RAX: 00007ff7fa7ded20 RBX: 0000563e86b5fc00 RCX: 000000000000acf8
RDX: 0000000000000000 RSI: 0000563e86b5fc00 RDI: 00007ff7fa940898
RBP: 0000563e86b50420 R08: 00000000001a1858 R09: 00000000001a1858
R10: 0000000000000002 R11: 0000000000390268 R12: 0000000000000026
R13: 000000000003e730 R14: 0000000000000000 R15: 00007ffefe48ace0
irq event stamp: 1147049
hardirqs last enabled at (1147048): [] _raw_spin_unlock_irq+0x1f/0x40
hardirqs last disabled at (1147049): [] _raw_spin_lock_irqsave+0x4e/0x50
softirqs last enabled at (1146586): [] __irq_exit_rcu+0x113/0x170
softirqs last disabled at (1147045): [] __irq_exit_rcu+0x113/0x170
---[ end trace 0000000000000000 ]---
==================================================================
BUG: KASAN: use-after-free in kernfs_get.part.0+0x5e/0x80
Write of size 4 at addr ffff88800d5f0000 by task systemd-journal/112
CPU: 1 PID: 112 Comm: systemd-journal 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
Call Trace:
dump_stack_lvl+0x8b/0xb3
print_report.cold+0x5e/0x5e1
kasan_report+0xb1/0x1b0
kasan_check_range+0x35/0x1b0
kernfs_get.part.0+0x5e/0x80
kernfs_get+0x1b/0x30
kernfs_notify+0x180/0x350
cgroup_file_notify+0xf5/0x1a0
call_timer_fn+0x17d/0x5f0
__run_timers.part.0+0x65e/0xa50
run_timer_softirq+0xae/0x1a0
__do_softirq+0x1c8/0x8cc
__irq_exit_rcu+0x113/0x170
irq_exit_rcu+0x5/0x20
sysvec_apic_timer_interrupt+0x8e/0xc0
asm_sysvec_apic_timer_interrupt+0x1b/0x20
RIP: 0010:handle_mm_fault+0x1a9/0xa10
Code: 31 ff 4c 89 f6 e8 47 07 dc ff 4d 85 f6 0f 85 46 05 00 00 e8 49 0a dc ff ba 01 00 00 00 be 14 00 00 00 4c 89 e7 e8 57 ca 10 00 32 0a dc ff e8 9d 8e c7 ff 31 ff 41 89 c4 89 c6 e8 b1 06 dc ff
RSP: 0000:ffff88800db5fe70 EFLAGS: 00000206
RAX: 00000000001180a3 RBX: 0000000000000255 RCX: ffffffff8128d13f
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88800db08270 R08: 0000000000000001 R09: ffffffff86a607ef
R10: fffffbfff0d4c0fd R11: 0000000000000001 R12: ffff88800e368000
R13: 00007ff7fa7ded20 R14: 0000000000000200 R15: ffff88801714b100
do_user_addr_fault+0x536/0x1300
exc_page_fault+0x98/0x1a0
asm_exc_page_fault+0x27/0x30
RIP: 0033:0x7ff7fbf3aace
Code: 40 38 00 00 00 00 4c 89 e8 48 f7 f1 48 8b 85 d8 00 00 00 48 c1 e2 04 48 01 d0 49 89 d5 48 8b 50 08 48 85 d2 0f 85 32 03 00 00 <4c> 89 00 48 8b 85 d8 00 00 00 4e 89 44 28 08 48 8b 85 d0 00 00 00
RSP: 002b:00007ffefe48acc0 EFLAGS: 00010246
RAX: 00007ff7fa7ded20 RBX: 0000563e86b5fc00 RCX: 000000000000acf8
RDX: 0000000000000000 RSI: 0000563e86b5fc00 RDI: 00007ff7fa940898
RBP: 0000563e86b50420 R08: 00000000001a1858 R09: 00000000001a1858
R10: 0000000000000002 R11: 0000000000390268 R12: 0000000000000026
R13: 000000000003e730 R14: 0000000000000000 R15: 00007ffefe48ace0
Allocated by task 298:
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 9686:
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 ffff88800d5f0000
which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 0 bytes inside of
168-byte region [ffff88800d5f0000, ffff88800d5f00a8)
The buggy address belongs to the physical page:
page:00000000ebcb9116 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xd5f0
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:
ffff88800d5eff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88800d5eff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88800d5f0000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88800d5f0080: fb fb fb fb fb fc fc fc fc fc fc fc fc 00 00 00
ffff88800d5f0100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
----------------
Code disassembly (best guess):
0: 31 ff xor %edi,%edi
2: 4c 89 f6 mov %r14,%rsi
5: e8 47 07 dc ff callq 0xffdc0751
a: 4d 85 f6 test %r14,%r14
d: 0f 85 46 05 00 00 jne 0x559
13: e8 49 0a dc ff callq 0xffdc0a61
18: ba 01 00 00 00 mov $0x1,%edx
1d: be 14 00 00 00 mov $0x14,%esi
22: 4c 89 e7 mov %r12,%rdi
25: e8 57 ca 10 00 callq 0x10ca81
* 2a: e8 32 0a dc ff callq 0xffdc0a61 <-- trapping instruction
2f: e8 9d 8e c7 ff callq 0xffc78ed1
34: 31 ff xor %edi,%edi
36: 41 89 c4 mov %eax,%r12d
39: 89 c6 mov %eax,%esi
3b: e8 b1 06 dc ff callq 0xffdc06f1