------------[ cut here ]------------
kernfs_put: syz2/pids.events: released with incorrect active_ref 0
------------[ cut here ]------------
WARNING: CPU: 0 PID: 12 at fs/kernfs/dir.c:504 kernfs_get.part.0+0x69/0x80
Modules linked in:
CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.19.0-rc4-next-20220704 #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 c8 0c a7 ff 85 ed 74 18 e8 ef 0f a7 ff be 04 00 00 00 48 89 df e8 d2 ba d9 ff f0 ff 03 5b 5d c3 e8 d7 0f 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: 0018:ffff88806ce09c80 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff88801baaebc8 RCX: 0000000000000100
RDX: ffff88800822d040 RSI: ffffffff819de5c9 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R13: 1ffffffff0a01e40 R14: ffff88801baaebc8 R15: ffff8880095c8d30
FS: 0000000000000000(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d927000 CR3: 0000000009c6e000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000600
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:__sanitizer_cov_trace_pc+0xd/0x60
Code: 00 5d e9 a6 e6 c3 00 66 0f 1f 44 00 00 48 8b be a8 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 65 8b 05 d9 78 bd 7e 89 c1 48 8b 34 24 <81> e1 00 01 00 00 65 48 8b 14 25 c0 6e 02 00 a9 00 01 ff 00 74 0e
RSP: 0018:ffff88800824fa70 EFLAGS: 00000283
RAX: 0000000080000000 RBX: ffffffff8179f21f RCX: 0000000080000000
RDX: ffff88800822d040 RSI: ffffffff82165dbf RDI: 0000000000000006
RBP: ffffffff819dea43 R08: 0000000000000006 R09: ffffffff819dea43
R10: ffffffff8179f21f R11: 0000000000000000 R12: ffffffff85900388
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000
find_bug+0x8f/0x440
report_bug+0x57/0x210
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 73 0b a7 ff 48 8b 14 24 44 89 f1 4c 89 fe 48 c7 c7 e0 58 72 84 e8 93 9c 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: ffff88801baaec00 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000001 R12: ffff88801baaebc8
R13: ffff88801b235828 R14: 0000000000000000 R15: ffff8880149a8aa0
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: 898935
hardirqs last enabled at (898934): [] _raw_spin_unlock_irq+0x1f/0x40
hardirqs last disabled at (898935): [] _raw_spin_lock_irqsave+0x4e/0x50
softirqs last enabled at (898908): [] __irq_exit_rcu+0x113/0x170
softirqs last disabled at (898931): [] __irq_exit_rcu+0x113/0x170
---[ end trace 0000000000000000 ]---
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 Tainted: G W 5.19.0-rc4-next-20220704 #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 73 0b a7 ff 48 8b 14 24 44 89 f1 4c 89 fe 48 c7 c7 e0 58 72 84 e8 93 9c 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: ffff88801baaec00 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000001 R12: ffff88801baaebc8
R13: ffff88801b235828 R14: 0000000000000000 R15: ffff8880149a8aa0
FS: 0000000000000000(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d927000 CR3: 0000000009c6e000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000600
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: 899203
hardirqs last enabled at (899209): [] vprintk_emit+0x4fe/0x550
hardirqs last disabled at (899214): [] vprintk_emit+0x495/0x550
softirqs last enabled at (898978): [] __irq_exit_rcu+0x113/0x170
softirqs last disabled at (898931): [] __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 ffff88801baaec48 by task kworker/0:1/12
CPU: 0 PID: 12 Comm: kworker/0:1 Tainted: G W 5.19.0-rc4-next-20220704 #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 293:
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
The buggy address belongs to the object at ffff88801baaebc8
which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 128 bytes inside of
168-byte region [ffff88801baaebc8, ffff88801baaec70)
The buggy address belongs to the physical page:
page:00000000a5de8fcc refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1baae
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:
ffff88801baaeb00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88801baaeb80: 00 fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb
>ffff88801baaec00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
^
ffff88801baaec80: fc fc fc fc fc fc 00 00 00 00 00 00 00 00 00 00
ffff88801baaed00: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc
==================================================================
BUG: kernel NULL pointer dereference, address: 0000000000000018
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 1a7c9067 P4D 1a7c9067 PUD 0
Oops: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 1 PID: 18482 Comm: kworker/1:3 Tainted: G B W 5.19.0-rc4-next-20220704 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Workqueue: events_power_efficient crda_timeout_work
RIP: 0010:qlist_free_all+0xd3/0x190
Code: 03 05 a1 82 7b 03 48 8b 48 08 48 89 c2 f6 c1 01 0f 85 b6 00 00 00 0f 1f 44 00 00 48 8b 02 f6 c4 02 b8 00 00 00 00 48 0f 44 d0 <4c> 8b 72 18 e9 50 ff ff ff 49 83 7e 48 00 0f 85 68 ff ff ff 41 f7
RSP: 0018:ffff888042bcfab0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88801cb3860f RCX: ffffea000072cdc8
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff81770c31
RBP: 0000000000000000 R08: ffff88801cb3860f R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: dffffc0000000000
R13: ffff888042bcfaf0 R14: 0000000000000000 R15: ffff88801baaebc8
FS: 0000000000000000(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000018 CR3: 000000004021a000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
Call Trace:
kasan_quarantine_reduce+0x180/0x200
__kasan_slab_alloc+0x78/0x80
kmem_cache_alloc+0x1b1/0x490
__create_object.isra.0+0x3d/0xc10
kmem_cache_alloc_trace+0x232/0x3d0
restore_regulatory_settings+0xcd2/0x13e0
crda_timeout_work+0x1d/0x30
process_one_work+0xa0f/0x1690
worker_thread+0x637/0x1250
kthread+0x2ed/0x3a0
ret_from_fork+0x22/0x30
Modules linked in:
CR2: 0000000000000018
---[ end trace 0000000000000000 ]---
RIP: 0010:qlist_free_all+0xd3/0x190
Code: 03 05 a1 82 7b 03 48 8b 48 08 48 89 c2 f6 c1 01 0f 85 b6 00 00 00 0f 1f 44 00 00 48 8b 02 f6 c4 02 b8 00 00 00 00 48 0f 44 d0 <4c> 8b 72 18 e9 50 ff ff ff 49 83 7e 48 00 0f 85 68 ff ff ff 41 f7
RSP: 0018:ffff888042bcfab0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88801cb3860f RCX: ffffea000072cdc8
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff81770c31
RBP: 0000000000000000 R08: ffff88801cb3860f R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: dffffc0000000000
R13: ffff888042bcfaf0 R14: 0000000000000000 R15: ffff88801baaebc8
FS: 0000000000000000(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000018 CR3: 000000004021a000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 1 bytes skipped:
0: 5d pop %rbp
1: e9 a6 e6 c3 00 jmpq 0xc3e6ac
6: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1)
c: 48 8b be a8 01 00 00 mov 0x1a8(%rsi),%rdi
13: e8 b4 ff ff ff callq 0xffffffcc
18: 31 c0 xor %eax,%eax
1a: c3 retq
1b: 90 nop
1c: 65 8b 05 d9 78 bd 7e mov %gs:0x7ebd78d9(%rip),%eax # 0x7ebd78fc
23: 89 c1 mov %eax,%ecx
25: 48 8b 34 24 mov (%rsp),%rsi
* 29: 81 e1 00 01 00 00 and $0x100,%ecx <-- trapping instruction
2f: 65 48 8b 14 25 c0 6e mov %gs:0x26ec0,%rdx
36: 02 00
38: a9 00 01 ff 00 test $0xff0100,%eax
3d: 74 0e je 0x4d