------------[ cut here ]------------
kernfs_put: syz2/pids.events: released with incorrect active_ref 0
WARNING: CPU: 1 PID: 8994 at fs/kernfs/dir.c:531 kernfs_put.part.0+0x433/0x540
Modules linked in:
CPU: 1 PID: 8994 Comm: kworker/1:3 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:ffff888047d57bd8 EFLAGS: 00010286
------------[ cut here ]------------
WARNING: CPU: 1 PID: 8994 at fs/kernfs/dir.c:504 kernfs_get.part.0+0x69/0x80
Modules linked in:
CPU: 1 PID: 8994 Comm: kworker/1:3 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_get.part.0+0x69/0x80
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
RSP: 0018:ffff88806cf09c80 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff888017c64488 RCX: 0000000000000100
RDX: ffff88801a5e5040 RSI: ffffffff819d2579 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R13: 1ffffffff0a01e40 R14: ffff888017c64488 R15: ffff888044874530
FS: 0000000000000000(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000563d7d1ae738 CR3: 0000000047e8e000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
Call Trace:
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:console_emit_next_record.constprop.0+0x4c8/0x800
Code: 83 e2 07 38 d0 7f 08 84 c0 0f 85 d5 02 00 00 88 5d 00 e8 db 3e 00 00 31 ff 4c 89 f6 e8 91 3f 19 00 4d 85 f6 0f 85 76 01 00 00 93 42 19 00 48 b8 00 00 00 00 00 fc ff df 48 03 04 24 48 c7 00
RSP: 0018:ffff888047d576b0 EFLAGS: 00000202
RAX: 00000000000cc0d3 RBX: 0000000000000000 RCX: ffffffff8128663f
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff888047d57858 R08: 0000000000000001 R09: ffffffff86a5c7c7
R10: fffffbfff0d4b8f8 R11: 0000000000000001 R12: 0000000000000001
R13: ffffffff86da8ba0 R14: 0000000000000200 R15: ffffffff8549fcf8
console_unlock+0x36c/0x590
vprintk_emit+0x1b9/0x550
vprintk+0x80/0x90
_printk+0xba/0xed
__show_regs.cold+0xc/0x481
show_regs+0x2f/0x40
__warn+0xe2/0x190
report_bug+0x1bc/0x210
handle_bug+0x3c/0x60
exc_invalid_op+0x14/0x40
asm_exc_invalid_op+0x1b/0x20
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:ffff888047d57bd8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffff88801a5e5040 RSI: ffffffff812b6848 RDI: ffffed1008faaf6d
RBP: ffff888017c644c0 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff888017c64488
R13: ffff88801b23b0e8 R14: 0000000000000000 R15: ffff8880152fce10
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: 835801
hardirqs last enabled at (835800): [] _raw_spin_unlock_irq+0x1f/0x40
hardirqs last disabled at (835801): [] _raw_spin_lock_irqsave+0x4e/0x50
softirqs last enabled at (835694): [] __irq_exit_rcu+0x113/0x170
softirqs last disabled at (835797): [] __irq_exit_rcu+0x113/0x170
---[ end trace 0000000000000000 ]---
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffff88801a5e5040 RSI: ffffffff812b6848 RDI: ffffed1008faaf6d
RBP: ffff888017c644c0 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff888017c64488
R13: ffff88801b23b0e8 R14: 0000000000000000 R15: ffff8880152fce10
FS: 0000000000000000(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000563d7d1ae738 CR3: 0000000047e8e000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
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: 837171
hardirqs last enabled at (837181): [] __up_console_sem+0x78/0x80
hardirqs last disabled at (837192): [] __up_console_sem+0x5d/0x80
softirqs last enabled at (836684): [] __irq_exit_rcu+0x113/0x170
softirqs last disabled at (836583): [] __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 ffff888017c64508 by task kworker/1:3/8994
CPU: 1 PID: 8994 Comm: kworker/1:3 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 297:
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 8994:
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 ffff888017c64488
which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 128 bytes inside of
168-byte region [ffff888017c64488, ffff888017c64530)
The buggy address belongs to the physical page:
page:000000005a88329b refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x17c64
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:
ffff888017c64400: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
ffff888017c64480: fc fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888017c64500: fb fb fb fb fb fb fc fc fc fc fc fc fc fc 00 00
------------[ cut here ]------------
^
ffff888017c64580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff888017c64600: 00 00 00 fc fc fc fc fc fc fc fc 00 00 00 00 00
==================================================================
WARNING: CPU: 0 PID: 11945 at fs/kernfs/dir.c:504 kernfs_get.part.0+0x69/0x80
Modules linked in:
CPU: 0 PID: 11945 Comm: syz-executor.2 Tainted: G B 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
RIP: 0010:kernfs_get.part.0+0x69/0x80
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
RSP: 0018:ffff8880444afa40 EFLAGS: 00010093
RAX: 0000000000000000 RBX: ffff888017c64488 RCX: 0000000000000000
RDX: ffff888047305040 RSI: ffffffff819d2579 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R13: 1ffffffff0a01e40 R14: ffff888017c64488 R15: ffff888044874530
FS: 000055555732d400(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6ded43f210 CR3: 0000000047e8e000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
Call Trace:
kernfs_get+0x1b/0x30
kernfs_notify+0x180/0x350
cgroup_file_notify+0xf5/0x1a0
pids_can_fork+0x22f/0x370
cgroup_can_fork+0x332/0x11b0
copy_process+0x4023/0x6d60
kernel_clone+0xe7/0xa60
__do_sys_clone+0xba/0x100
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f84ef6a6f41
Code: 48 85 ff 74 3d 48 85 f6 74 38 48 83 ee 10 48 89 4e 08 48 89 3e 48 89 d7 4c 89 c2 4d 89 c8 4c 8b 54 24 08 b8 38 00 00 00 0f 05 <48> 85 c0 7c 13 74 01 c3 31 ed 58 5f ff d0 48 89 c7 b8 3c 00 00 00
RSP: 002b:00007ffd4cf44ca8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f84ecbfa700 RCX: 00007f84ef6a6f41
RDX: 00007f84ecbfa9d0 RSI: 00007f84ecbfa2f0 RDI: 00000000003d0f00
RBP: 00007ffd4cf44ee0 R08: 00007f84ecbfa700 R09: 00007f84ecbfa700
R10: 00007f84ecbfa9d0 R11: 0000000000000206 R12: 00007ffd4cf44d5e
R13: 00007ffd4cf44d5f R14: 00007f84ecbfa300 R15: 000055555732ed50
irq event stamp: 12272
hardirqs last enabled at (12271): [] _raw_spin_unlock_irq+0x1f/0x40
hardirqs last disabled at (12272): [] _raw_spin_lock_irqsave+0x4e/0x50
softirqs last enabled at (12256): [] fpu_clone+0x3be/0xb00
softirqs last disabled at (12254): [] fpu_clone+0x331/0xb00
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
0: 83 e2 07 and $0x7,%edx
3: 38 d0 cmp %dl,%al
5: 7f 08 jg 0xf
7: 84 c0 test %al,%al
9: 0f 85 d5 02 00 00 jne 0x2e4
f: 88 5d 00 mov %bl,0x0(%rbp)
12: e8 db 3e 00 00 callq 0x3ef2
17: 31 ff xor %edi,%edi
19: 4c 89 f6 mov %r14,%rsi
1c: e8 91 3f 19 00 callq 0x193fb2
21: 4d 85 f6 test %r14,%r14
24: 0f 85 76 01 00 00 jne 0x1a0
* 2a: e8 93 42 19 00 callq 0x1942c2 <-- trapping instruction
2f: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
36: fc ff df
39: 48 03 04 24 add (%rsp),%rax
3d: 48 rex.W
3e: c7 .byte 0xc7