------------[ cut here ]------------
kernfs_put: syz2/pids.events: released with incorrect active_ref 0
------------[ cut here ]------------
WARNING: CPU: 0 PID: 58843 at fs/kernfs/dir.c:531 kernfs_put.part.0+0x433/0x540
WARNING: CPU: 1 PID: 20805 at fs/kernfs/dir.c:504 kernfs_get.part.0+0x69/0x80
Modules linked in:
Modules linked in:
CPU: 1 PID: 20805 Comm: kworker/u4:3 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: phy6 ieee80211_iface_work
CPU: 0 PID: 58843 Comm: kworker/0:1 Not tainted 5.19.0-rc5-next-20220706 #1
RIP: 0010:kernfs_get.part.0+0x69/0x80
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
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
Workqueue: events kernfs_notify_workfn
RSP: 0018:ffff88806cf09c80 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff88803a239570 RCX: 0000000000000100
RDX: ffff888016d40000 RSI: ffffffff819df849 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
RIP: 0010:kernfs_put.part.0+0x433/0x540
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R13: 1ffffffff0a01e40 R14: ffff88803a239570 R15: ffff888044532130
FS: 0000000000000000(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
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
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
RSP: 0018:ffff888048db7bd8 EFLAGS: 00010286
CR2: 0000001b31621000 CR3: 000000004b850000 CR4: 0000000000350ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
Call Trace:
kernfs_get+0x1b/0x30
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
kernfs_notify+0x180/0x350
RDX: ffff88804c763580 RSI: ffffffff812bd348 RDI: ffffed10091b6f6d
cgroup_file_notify+0xf5/0x1a0
RBP: ffff88803a2395a8 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88803a239570
call_timer_fn+0x17d/0x5f0
R13: ffff8880353d91d0 R14: 0000000000000000 R15: ffff8880398dc398
FS: 0000000000000000(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffecaa45728 CR3: 0000000021748000 CR4: 0000000000350ef0
__run_timers.part.0+0x65e/0xa50
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
Call Trace:
run_timer_softirq+0xae/0x1a0
__do_softirq+0x1c8/0x8cc
kernfs_put+0x42/0x50
__irq_exit_rcu+0x113/0x170
kernfs_notify_workfn+0x417/0x560
irq_exit_rcu+0x5/0x20
sysvec_apic_timer_interrupt+0x8e/0xc0
asm_sysvec_apic_timer_interrupt+0x1b/0x20
RIP: 0010:_raw_spin_unlock_irqrestore+0x2e/0x50
process_one_work+0xa0f/0x1690
Code: 48 83 c7 18 53 48 89 f3 48 8b 74 24 10 e8 4a 51 0d fd 48 89 ef e8 b2 d2 0d fd 80 e7 02 74 06 e8 e8 a8 2f fd fb bf 01 00 00 00 8d 74 03 fd 65 8b 05 06 51 e6 7b 85 c0 74 03 5b 5d c3 0f 1f 44
RSP: 0018:ffff888045757b68 EFLAGS: 00000206
RAX: 000000000034d82b RBX: 0000000000000246 RCX: ffffffff8128d13f
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffffff852ca760 R08: 0000000000000001 R09: ffffffff86a6087f
R10: fffffbfff0d4c10f R11: 0000000000000001 R12: ffff8880182adb00
worker_thread+0x637/0x1250
R13: ffff88800def97e8 R14: ffff8880182acf78 R15: ffff888007841c80
kthread+0x2ed/0x3a0
find_and_remove_object+0x123/0x160
ret_from_fork+0x22/0x30
kmemleak_free+0x21/0x30
kfree+0xbb/0x5d0
irq event stamp: 1555257
skb_release_data+0x686/0x7b0
hardirqs last enabled at (1555265): [] console_emit_next_record.constprop.0+0x648/0x800
hardirqs last disabled at (1555274): [] console_emit_next_record.constprop.0+0x667/0x800
kfree_skb_reason.part.0+0xa4/0x2a0
softirqs last enabled at (1554862): [] __irq_exit_rcu+0x113/0x170
kfree_skb_reason+0x85/0x110
softirqs last disabled at (1554829): [] __irq_exit_rcu+0x113/0x170
ieee80211_iface_work+0x34f/0xc80
---[ end trace 0000000000000000 ]---
process_one_work+0xa0f/0x1690
worker_thread+0x637/0x1250
kthread+0x2ed/0x3a0
ret_from_fork+0x22/0x30
irq event stamp: 3463217
hardirqs last enabled at (3463216): [] _raw_spin_unlock_irq+0x1f/0x40
hardirqs last disabled at (3463217): [] _raw_spin_lock_irqsave+0x4e/0x50
softirqs last enabled at (3463200): [] cfg80211_put_bss+0x1b0/0x270
softirqs last disabled at (3463213): [] __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 ffff88803a239570 by task kworker/u4:3/20805
CPU: 1 PID: 20805 Comm: kworker/u4:3 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
Workqueue: phy6 ieee80211_iface_work
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:_raw_spin_unlock_irqrestore+0x2e/0x50
Code: 48 83 c7 18 53 48 89 f3 48 8b 74 24 10 e8 4a 51 0d fd 48 89 ef e8 b2 d2 0d fd 80 e7 02 74 06 e8 e8 a8 2f fd fb bf 01 00 00 00 8d 74 03 fd 65 8b 05 06 51 e6 7b 85 c0 74 03 5b 5d c3 0f 1f 44
RSP: 0018:ffff888045757b68 EFLAGS: 00000206
RAX: 000000000034d82b RBX: 0000000000000246 RCX: ffffffff8128d13f
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffffff852ca760 R08: 0000000000000001 R09: ffffffff86a6087f
R10: fffffbfff0d4c10f R11: 0000000000000001 R12: ffff8880182adb00
R13: ffff88800def97e8 R14: ffff8880182acf78 R15: ffff888007841c80
find_and_remove_object+0x123/0x160
kmemleak_free+0x21/0x30
kfree+0xbb/0x5d0
skb_release_data+0x686/0x7b0
kfree_skb_reason.part.0+0xa4/0x2a0
kfree_skb_reason+0x85/0x110
ieee80211_iface_work+0x34f/0xc80
process_one_work+0xa0f/0x1690
worker_thread+0x637/0x1250
kthread+0x2ed/0x3a0
ret_from_fork+0x22/0x30
Allocated by task 16700:
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 58843:
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 ffff88803a239570
which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 0 bytes inside of
168-byte region [ffff88803a239570, ffff88803a239618)
The buggy address belongs to the physical page:
page:00000000101c5ea3 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3a239
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:
ffff88803a239400: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
ffff88803a239480: fc 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88803a239500: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fa fb
^
ffff88803a239580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88803a239600: fb fb fb fc fc fc fc fc fc fc fc 00 00 00 00 00
==================================================================
debugfs: Directory 'sg0' with parent 'block' already present!
blktrace: debugfs_dir not present for sg0 so skipping
debugfs: Directory 'sg0' with parent 'block' already present!
blktrace: debugfs_dir not present for sg0 so skipping
----------------
Code disassembly (best guess):
0: 48 83 c7 18 add $0x18,%rdi
4: 53 push %rbx
5: 48 89 f3 mov %rsi,%rbx
8: 48 8b 74 24 10 mov 0x10(%rsp),%rsi
d: e8 4a 51 0d fd callq 0xfd0d515c
12: 48 89 ef mov %rbp,%rdi
15: e8 b2 d2 0d fd callq 0xfd0dd2cc
1a: 80 e7 02 and $0x2,%bh
1d: 74 06 je 0x25
1f: e8 e8 a8 2f fd callq 0xfd2fa90c
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 8d 74 03 fd callq 0xfd0374bc <-- trapping instruction
2f: 65 8b 05 06 51 e6 7b mov %gs:0x7be65106(%rip),%eax # 0x7be6513c
36: 85 c0 test %eax,%eax
38: 74 03 je 0x3d
3a: 5b pop %rbx
3b: 5d pop %rbp
3c: c3 retq
3d: 0f .byte 0xf
3e: 1f (bad)
3f: 44 rex.R