------------[ cut here ]------------
kernfs_put: syz3/pids.events: released with incorrect active_ref 0
WARNING: CPU: 0 PID: 69461 at fs/kernfs/dir.c:531 kernfs_put.part.0+0x433/0x540
Modules linked in:
CPU: 0 PID: 69461 Comm: kworker/0:0 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
------------[ cut here ]------------
WARNING: CPU: 0 PID: 69461 at fs/kernfs/dir.c:504 kernfs_get.part.0+0x69/0x80
Modules linked in:
CPU: 0 PID: 69461 Comm: kworker/0:0 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:ffff88806ce09c80 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff88800eb9ebc8 RCX: 0000000000000100
RDX: ffff88803d983580 RSI: ffffffff819d2579 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R13: 1ffffffff0a01e40 R14: ffff88800eb9ebc8 R15: ffff88801d023d30
FS: 0000000000000000(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555562f3c58 CR3: 000000000caf6000 CR4: 0000000000350ef0
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:ffff88803d807680 EFLAGS: 00000206
RAX: 00000000001053bd RBX: 0000000000000000 RCX: ffffffff8128663f
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff88803d807828 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_ip+0x22/0x30
show_iret_regs+0xd/0x33
__show_regs+0x1e/0x60
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:ffff88803d807bd8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffff88803d983580 RSI: ffffffff812b6848 RDI: ffffed1007b00f6d
RBP: ffff88800eb9ec00 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800eb9ebc8
R13: ffff88800ed41828 R14: 0000000000000000 R15: ffff888008d79988
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: 1070019
hardirqs last enabled at (1070018): [] _raw_spin_unlock_irq+0x1f/0x40
hardirqs last disabled at (1070019): [] _raw_spin_lock_irqsave+0x4e/0x50
softirqs last enabled at (1069942): [] __irq_exit_rcu+0x113/0x170
softirqs last disabled at (1070015): [] __irq_exit_rcu+0x113/0x170
---[ end trace 0000000000000000 ]---
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:ffff88803d807bd8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffff88803d983580 RSI: ffffffff812b6848 RDI: ffffed1007b00f6d
RBP: ffff88800eb9ec00 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800eb9ebc8
R13: ffff88800ed41828 R14: 0000000000000000 R15: ffff888008d79988
FS: 0000000000000000(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005555562f3c58 CR3: 000000000caf6000 CR4: 0000000000350ef0
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: 1071025
hardirqs last enabled at (1071037): [] __up_console_sem+0x78/0x80
hardirqs last disabled at (1071048): [] __up_console_sem+0x5d/0x80
softirqs last enabled at (1070332): [] __irq_exit_rcu+0x113/0x170
softirqs last disabled at (1070279): [] __irq_exit_rcu+0x113/0x170
---[ end trace 0000000000000000 ]---
==================================================================
BUG: KASAN: use-after-free in llist_del_first+0x89/0xa0
------------[ cut here ]------------
Read of size 8 at addr ffff88800eb9ec48 by task kworker/0:0/69461
CPU: 0 PID: 69461 Comm: kworker/0:0 Tainted: G W 5.19.0-rc4-next-20220701 #1
WARNING: CPU: 1 PID: 75036 at fs/kernfs/dir.c:504 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
Modules linked in:
Workqueue: events kernfs_notify_workfn
Call Trace:
CPU: 1 PID: 75036 Comm: modprobe 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
dump_stack_lvl+0x8b/0xb3
RIP: 0010:kernfs_get.part.0+0x69/0x80
print_report.cold+0x5e/0x5e1
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
kasan_report+0xb1/0x1b0
RAX: 0000000000000000 RBX: ffff88800eb9ebc8 RCX: 0000000000000100
llist_del_first+0x89/0xa0
RDX: ffff88803a685040 RSI: ffffffff819d2579 RDI: 0000000000000005
kernfs_notify_workfn+0x78/0x560
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R13: 1ffffffff0a01e40 R14: ffff88800eb9ebc8 R15: ffff88801d023d30
FS: 0000000000000000(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
process_one_work+0xa0f/0x1690
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdb571ca9d8 CR3: 000000003e44c000 CR4: 0000000000350ee0
Call Trace:
kernfs_get+0x1b/0x30
worker_thread+0x637/0x1250
kernfs_notify+0x180/0x350
cgroup_file_notify+0xf5/0x1a0
kthread+0x2ed/0x3a0
call_timer_fn+0x17d/0x5f0
ret_from_fork+0x22/0x30
Allocated by task 292:
kasan_save_stack+0x1e/0x40
__kasan_slab_alloc+0x66/0x80
__run_timers.part.0+0x65e/0xa50
kmem_cache_alloc+0x1b1/0x490
__kernfs_new_node+0xd4/0x8b0
kernfs_new_node+0x93/0x120
__kernfs_create_file+0x51/0x350
run_timer_softirq+0xae/0x1a0
cgroup_addrm_files+0x3e2/0x9d0
__do_softirq+0x1c8/0x8cc
css_populate_dir+0x19b/0x450
__irq_exit_rcu+0x113/0x170
cgroup_apply_control_enable+0x3ae/0xa40
irq_exit_rcu+0x5/0x20
cgroup_mkdir+0x824/0x11f0
sysvec_apic_timer_interrupt+0x8e/0xc0
kernfs_iop_mkdir+0x149/0x1d0
vfs_mkdir+0x417/0x6a0
do_mkdirat+0x17b/0x2e0
asm_sysvec_apic_timer_interrupt+0x1b/0x20
__x64_sys_mkdir+0xf2/0x140
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60
do_syscall_64+0x3b/0x90
Code: 48 89 ef 5d e9 d1 d4 31 00 be 03 00 00 00 5d e9 c6 69 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 49 02 be 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RSP: 0018:ffff88803c6b7878 EFLAGS: 00000246
Freed by task 69461:
kasan_save_stack+0x1e/0x40
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff816a35d3
kasan_set_track+0x21/0x30
RDX: ffff88803a685040 RSI: 0000000000000000 RDI: 0000000000000005
kasan_set_free_info+0x20/0x30
RBP: ffff8880397fc750 R08: 0000000000000005 R09: 0000000000000000
__kasan_slab_free+0x108/0x190
R10: 0000000000000000 R11: 0000000000000001 R12: 00007f1d86451000
kmem_cache_free+0xfb/0x600
R13: 0000000000000000 R14: 0000000000000000 R15: ffff88803d848410
kernfs_put.part.0+0x2c7/0x540
kernfs_put+0x42/0x50
__vma_adjust+0x1152/0x1890
kernfs_notify_workfn+0x417/0x560
process_one_work+0xa0f/0x1690
worker_thread+0x637/0x1250
kthread+0x2ed/0x3a0
__split_vma+0x452/0x540
ret_from_fork+0x22/0x30
The buggy address belongs to the object at ffff88800eb9ebc8
which belongs to the cache kernfs_node_cache of size 168
do_mas_align_munmap.constprop.0+0x629/0xff0
The buggy address is located 128 bytes inside of
168-byte region [ffff88800eb9ebc8, ffff88800eb9ec70)
The buggy address belongs to the physical page:
page:0000000035eeca17 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xeb9e
flags: 0x100000000000200(slab|node=0|zone=1)
raw: 0100000000000200 0000000000000000 dead000000000122 ffff8880080718c0
do_mas_munmap+0x1e8/0x2b0
raw: 0000000000000000 0000000000110011 00000001ffffffff 0000000000000000
mmap_region+0x21c/0x19f0
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff88800eb9eb00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88800eb9eb80: 00 fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb
>ffff88800eb9ec00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
do_mmap+0x824/0xf40
^
vm_mmap_pgoff+0x1ab/0x270
ffff88800eb9ec80: fc fc fc fc fc fc 00 00 00 00 00 00 00 00 00 00
ffff88800eb9ed00: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc
ksys_mmap_pgoff+0x3cc/0x4f0
==================================================================
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f1d8678ed82
Code: eb aa 66 0f 1f 44 00 00 41 f7 c1 ff 0f 00 00 75 27 55 48 89 fd 53 89 cb 48 85 ff 74 33 41 89 da 48 89 ef b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 56 5b 5d c3 0f 1f 00 c7 05 ae 03 01 00 16 00
RSP: 002b:00007ffe51189a18 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000000000000812 RCX: 00007f1d8678ed82
RDX: 0000000000000003 RSI: 0000000000006000 RDI: 00007f1d86447000
RBP: 00007f1d86447000 R08: 0000000000000000 R09: 00000000001ba000
R10: 0000000000000812 R11: 0000000000000206 R12: 00007f1d8676da20
R13: 00007ffe51189a30 R14: 00007ffe51189ac0 R15: 00007ffe51189e50
irq event stamp: 7571
hardirqs last enabled at (7570): [] _raw_spin_unlock_irq+0x1f/0x40
hardirqs last disabled at (7571): [] _raw_spin_lock_irqsave+0x4e/0x50
softirqs last enabled at (7168): [] __irq_exit_rcu+0x113/0x170
softirqs last disabled at (7567): [] __irq_exit_rcu+0x113/0x170
---[ end trace 0000000000000000 ]---
kmemleak: 53 new suspected memory leaks (see /sys/kernel/debug/kmemleak)
----------------
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