------------[ cut here ]------------
kernfs_put: syz7/memory.events.local: released with incorrect active_ref 0
WARNING: CPU: 0 PID: 14709 at fs/kernfs/dir.c:531 kernfs_put.part.0+0x433/0x540
Modules linked in:
CPU: 0 PID: 14709 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:ffff888047ddfbd8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffff888043731ac0 RSI: ffffffff812bd348 RDI: ffffed1008fbbf6d
RBP: ffff88801af02120 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000001 R12: ffff88801af020e8
R13: ffff888043b18740 R14: 0000000000000000 R15: ffff8880172b3dc0
FS: 0000000000000000(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
------------[ cut here ]------------
CR2: 000055a3198e9228 CR3: 0000000046156000 CR4: 0000000000350ef0
WARNING: CPU: 1 PID: 126 at fs/kernfs/dir.c:504 kernfs_get.part.0+0x69/0x80
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Modules linked in:
CPU: 1 PID: 126 Comm: systemd-udevd Not tainted 5.19.0-rc5-next-20220706 #1
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Call Trace:
RIP: 0010:kernfs_get.part.0+0x69/0x80
kernfs_put+0x42/0x50
kernfs_notify_workfn+0x417/0x560
process_one_work+0xa0f/0x1690
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: ffff88801af020e8 RCX: 0000000000000100
RDX: ffff88800fa25040 RSI: ffffffff819df849 RDI: 0000000000000005
worker_thread+0x637/0x1250
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R13: 1ffffffff0a01e40 R14: ffff88801af020e8 R15: ffff8880449584f0
kthread+0x2ed/0x3a0
FS: 00007f2122c238c0(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
ret_from_fork+0x22/0x30
CR2: 000055a319943728 CR3: 000000000e126000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
irq event stamp: 929583
Call Trace:
kernfs_get+0x1b/0x30
hardirqs last enabled at (929593): [] console_emit_next_record.constprop.0+0x648/0x800
kernfs_notify+0x180/0x350
hardirqs last disabled at (929602): [] console_emit_next_record.constprop.0+0x667/0x800
cgroup_file_notify+0xf5/0x1a0
softirqs last enabled at (928906): [] srcu_invoke_callbacks+0x1e5/0x3a0
softirqs last disabled at (928902): [] srcu_invoke_callbacks+0x1b5/0x3a0
call_timer_fn+0x17d/0x5f0
---[ 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:charge_memcg+0x20a/0x2c0
Code: fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 a7 00 00 00 48 8b 75 00 4c 89 e7 48 c1 ee 3a e8 2f 1e ff ff e8 5a a2 d1 ff fb 45 31 f6 <4c> 89 ef e8 2e f7 fe ff 44 89 f0 5b 5d 41 5c 41 5d 41 5e 41 5f c3
RSP: 0000:ffff888008ac7b30 EFLAGS: 00000246
RAX: 000000000160c5c1 RBX: 0000000000000001 RCX: ffffffff8128d13f
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffea00011dda00 R08: 0000000000000001 R09: ffffffff86a607ef
R10: fffffbfff0d4c0fd R11: 0000000000000001 R12: ffff88800fef8000
R13: ffff888009285e80 R14: 0000000000000000 R15: 0000000000000000
__mem_cgroup_charge+0x24/0x80
wp_page_copy+0x2fb/0x2410
do_wp_page+0x198/0x1cf0
__handle_mm_fault+0x11bb/0x34f0
handle_mm_fault+0x2e6/0xa10
do_user_addr_fault+0x536/0x1300
exc_page_fault+0x98/0x1a0
asm_exc_page_fault+0x27/0x30
RIP: 0033:0x7f212306d201
Code: 00 48 29 e8 49 8d 0c 2f 48 8b 5c 24 28 49 39 d4 49 89 4c 24 60 0f 95 c2 48 83 c8 01 0f b6 d2 48 c1 e2 02 48 09 ea 48 83 ca 01 <49> 89 57 08 48 89 41 08 49 83 c7 10 eb b2 48 8d 3d 92 65 10 00 e8
RSP: 002b:00007ffe69e941e0 EFLAGS: 00010206
RAX: 00000000000208a1 RBX: 0000000000008030 RCX: 000055a31994b760
RDX: 0000000000008041 RSI: 0000000000677a6b RDI: 0000000000000004
RBP: 0000000000008040 R08: 0000000000000003 R09: 00007f21231a2be0
R10: 0000000000000076 R11: 0000000000000000 R12: 00007f21231a2b80
R13: 0000000000000804 R14: fffffffffffffe30 R15: 000055a319943720
irq event stamp: 23119307
hardirqs last enabled at (23119306): [] _raw_spin_unlock_irq+0x1f/0x40
hardirqs last disabled at (23119307): [] _raw_spin_lock_irqsave+0x4e/0x50
softirqs last enabled at (23119112): [] __irq_exit_rcu+0x113/0x170
softirqs last disabled at (23119299): [] __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 ffff88801af020e8 by task systemd-udevd/126
CPU: 1 PID: 126 Comm: systemd-udevd 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:charge_memcg+0x20a/0x2c0
Code: fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 a7 00 00 00 48 8b 75 00 4c 89 e7 48 c1 ee 3a e8 2f 1e ff ff e8 5a a2 d1 ff fb 45 31 f6 <4c> 89 ef e8 2e f7 fe ff 44 89 f0 5b 5d 41 5c 41 5d 41 5e 41 5f c3
RSP: 0000:ffff888008ac7b30 EFLAGS: 00000246
RAX: 000000000160c5c1 RBX: 0000000000000001 RCX: ffffffff8128d13f
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffea00011dda00 R08: 0000000000000001 R09: ffffffff86a607ef
R10: fffffbfff0d4c0fd R11: 0000000000000001 R12: ffff88800fef8000
R13: ffff888009285e80 R14: 0000000000000000 R15: 0000000000000000
__mem_cgroup_charge+0x24/0x80
wp_page_copy+0x2fb/0x2410
do_wp_page+0x198/0x1cf0
__handle_mm_fault+0x11bb/0x34f0
handle_mm_fault+0x2e6/0xa10
do_user_addr_fault+0x536/0x1300
exc_page_fault+0x98/0x1a0
asm_exc_page_fault+0x27/0x30
RIP: 0033:0x7f212306d201
Code: 00 48 29 e8 49 8d 0c 2f 48 8b 5c 24 28 49 39 d4 49 89 4c 24 60 0f 95 c2 48 83 c8 01 0f b6 d2 48 c1 e2 02 48 09 ea 48 83 ca 01 <49> 89 57 08 48 89 41 08 49 83 c7 10 eb b2 48 8d 3d 92 65 10 00 e8
RSP: 002b:00007ffe69e941e0 EFLAGS: 00010206
RAX: 00000000000208a1 RBX: 0000000000008030 RCX: 000055a31994b760
RDX: 0000000000008041 RSI: 0000000000677a6b RDI: 0000000000000004
RBP: 0000000000008040 R08: 0000000000000003 R09: 00007f21231a2be0
R10: 0000000000000076 R11: 0000000000000000 R12: 00007f21231a2b80
R13: 0000000000000804 R14: fffffffffffffe30 R15: 000055a319943720
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 14709:
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 ffff88801af020e8
which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 0 bytes inside of
168-byte region [ffff88801af020e8, ffff88801af02190)
The buggy address belongs to the physical page:
page:00000000d0a6c9fa refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1af02
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:
ffff88801af01f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88801af02000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88801af02080: 00 00 00 00 00 fc fc fc fc fc fc fc fc fa fb fb
^
ffff88801af02100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801af02180: fb fb fc fc fc fc fc fc fc fc 00 00 00 00 00 00
==================================================================
kmemleak: 2 new suspected memory leaks (see /sys/kernel/debug/kmemleak)
----------------
Code disassembly (best guess), 3 bytes skipped:
0: 48 c1 ea 03 shr $0x3,%rdx
4: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1)
8: 0f 85 a7 00 00 00 jne 0xb5
e: 48 8b 75 00 mov 0x0(%rbp),%rsi
12: 4c 89 e7 mov %r12,%rdi
15: 48 c1 ee 3a shr $0x3a,%rsi
19: e8 2f 1e ff ff callq 0xffff1e4d
1e: e8 5a a2 d1 ff callq 0xffd1a27d
23: fb sti
24: 45 31 f6 xor %r14d,%r14d
* 27: 4c 89 ef mov %r13,%rdi <-- trapping instruction
2a: e8 2e f7 fe ff callq 0xfffef75d
2f: 44 89 f0 mov %r14d,%eax
32: 5b pop %rbx
33: 5d pop %rbp
34: 41 5c pop %r12
36: 41 5d pop %r13
38: 41 5e pop %r14
3a: 41 5f pop %r15
3c: c3 retq