------------[ cut here ]------------
kernfs_put: syz4/pids.events: released with incorrect active_ref 0
WARNING: CPU: 0 PID: 19577 at fs/kernfs/dir.c:531 kernfs_put.part.0+0x433/0x540
Modules linked in:
CPU: 0 PID: 19577 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
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:ffff888046507bd8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffff88804a481ac0 RSI: ffffffff812b6848 RDI: ffffed1008ca0f6d
RBP: ffff88801da21b18 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000001 R12: ffff88801da21ae0
R13: ffff888017a74570 R14: 0000000000000000 R15: ffff888014c9fb18
FS: 0000000000000000(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc4b17441f0 CR3: 000000000db10000 CR4: 0000000000350ef0
------------[ cut here ]------------
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
Call Trace:
kernfs_put+0x42/0x50
kernfs_notify_workfn+0x417/0x560
WARNING: CPU: 1 PID: 112 at fs/kernfs/dir.c:504 kernfs_get.part.0+0x69/0x80
Modules linked in:
CPU: 1 PID: 112 Comm: systemd-journal 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
RIP: 0010:kernfs_get.part.0+0x69/0x80
process_one_work+0xa0f/0x1690
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: ffff88801da21ae0 RCX: 0000000000000100
RDX: ffff88800f7dd040 RSI: ffffffff819d2579 RDI: 0000000000000005
worker_thread+0x637/0x1250
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R13: 1ffffffff0a01e40 R14: ffff88801da21ae0 R15: ffff88801da25530
FS: 00007f8cbc5f7900(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
kthread+0x2ed/0x3a0
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8cbb9f49a0 CR3: 000000000f364000 CR4: 0000000000350ee0
ret_from_fork+0x22/0x30
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
irq event stamp: 273033
Call Trace:
hardirqs last enabled at (273043): [] console_emit_next_record.constprop.0+0x648/0x800
kernfs_get+0x1b/0x30
hardirqs last disabled at (273052): [] console_emit_next_record.constprop.0+0x667/0x800
kernfs_notify+0x180/0x350
softirqs last enabled at (271274): [] __irq_exit_rcu+0x113/0x170
cgroup_file_notify+0xf5/0x1a0
softirqs last disabled at (271265): [] __irq_exit_rcu+0x113/0x170
---[ end trace 0000000000000000 ]---
call_timer_fn+0x17d/0x5f0
==================================================================
BUG: KASAN: use-after-free in llist_del_first+0x89/0xa0
Read of size 8 at addr ffff88801da21b60 by task kworker/0:0/19577
CPU: 0 PID: 19577 Comm: kworker/0:0 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:
__run_timers.part.0+0x65e/0xa50
dump_stack_lvl+0x8b/0xb3
print_report.cold+0x5e/0x5e1
kasan_report+0xb1/0x1b0
llist_del_first+0x89/0xa0
run_timer_softirq+0xae/0x1a0
kernfs_notify_workfn+0x78/0x560
__do_softirq+0x1c8/0x8cc
__irq_exit_rcu+0x113/0x170
irq_exit_rcu+0x5/0x20
sysvec_apic_timer_interrupt+0x8e/0xc0
process_one_work+0xa0f/0x1690
asm_sysvec_apic_timer_interrupt+0x1b/0x20
RIP: 0010:kasan_quarantine_put+0x89/0x1e0
worker_thread+0x637/0x1250
Code: c7 45 00 00 00 00 00 48 03 58 10 48 89 58 10 48 81 fb 00 00 10 00 77 5b 41 bc 01 00 00 00 4d 85 ed 74 3f e8 a9 3e d4 ff fb 5b <44> 89 e0 5d 41 5c 41 5d 41 5e c3 e8 97 3d d4 ff 48 c7 c3 80 4b 03
RSP: 0018:ffff88800f4efd20 EFLAGS: 00000206
kthread+0x2ed/0x3a0
RAX: 000000000048044d RBX: ffff88804465e600 RCX: 1ffffffff0b1cd49
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
ret_from_fork+0x22/0x30
RBP: ffff88804465e600 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
Allocated by task 299:
R13: 0000000000000200 R14: 00000000ffffff9c R15: ffff888008071280
kasan_save_stack+0x1e/0x40
__kasan_slab_alloc+0x66/0x80
kmem_cache_free+0xfb/0x600
kmem_cache_alloc+0x1b1/0x490
putname+0xfe/0x140
__kernfs_new_node+0xd4/0x8b0
do_sys_openat2+0x153/0x4c0
kernfs_new_node+0x93/0x120
__kernfs_create_file+0x51/0x350
cgroup_addrm_files+0x3e2/0x9d0
css_populate_dir+0x19b/0x450
__x64_sys_openat+0x13f/0x1f0
cgroup_apply_control_enable+0x3ae/0xa40
cgroup_mkdir+0x824/0x11f0
kernfs_iop_mkdir+0x149/0x1d0
do_syscall_64+0x3b/0x90
vfs_mkdir+0x417/0x6a0
entry_SYSCALL_64_after_hwframe+0x46/0xb0
do_mkdirat+0x17b/0x2e0
RIP: 0033:0x7f8cbceb0c64
__x64_sys_mkdir+0xf2/0x140
Code: 84 00 00 00 00 00 44 89 54 24 0c e8 36 61 f9 ff 44 8b 54 24 0c 44 89 e2 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 34 44 89 c7 89 44 24 0c e8 68 61 f9 ff 8b 44
do_syscall_64+0x3b/0x90
RSP: 002b:00007fff99984df0 EFLAGS: 00000293
entry_SYSCALL_64_after_hwframe+0x46/0xb0
ORIG_RAX: 0000000000000101
Freed by task 19577:
RAX: ffffffffffffffda RBX: 0000556fda421d60 RCX: 00007f8cbceb0c64
kasan_save_stack+0x1e/0x40
RDX: 0000000000080802 RSI: 0000556fda442680 RDI: 00000000ffffff9c
kasan_set_track+0x21/0x30
RBP: 0000556fda442680 R08: 0000000000000000 R09: ffffffffffffff01
kasan_set_free_info+0x20/0x30
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000080802
__kasan_slab_free+0x108/0x190
R13: 00000000fffffffa R14: 0000556fda4318c0 R15: 0000000000000002
kmem_cache_free+0xfb/0x600
kernfs_put.part.0+0x2c7/0x540
irq event stamp: 4719699
kernfs_put+0x42/0x50
hardirqs last enabled at (4719698): [] _raw_spin_unlock_irq+0x1f/0x40
kernfs_notify_workfn+0x417/0x560
hardirqs last disabled at (4719699): [] _raw_spin_lock_irqsave+0x4e/0x50
process_one_work+0xa0f/0x1690
softirqs last enabled at (4718780): [] __irq_exit_rcu+0x113/0x170
worker_thread+0x637/0x1250
softirqs last disabled at (4719695): [] __irq_exit_rcu+0x113/0x170
kthread+0x2ed/0x3a0
---[ end trace 0000000000000000 ]---
ret_from_fork+0x22/0x30
The buggy address belongs to the object at ffff88801da21ae0
which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 128 bytes inside of
168-byte region [ffff88801da21ae0, ffff88801da21b88)
The buggy address belongs to the physical page:
page:0000000061466c01 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1da21
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:
ffff88801da21a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88801da21a80: 00 00 00 00 fc fc fc fc fc fc fc fc fa fb fb fb
>ffff88801da21b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88801da21b80: fb fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00
ffff88801da21c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc
==================================================================
----------------
Code disassembly (best guess):
0: c7 45 00 00 00 00 00 movl $0x0,0x0(%rbp)
7: 48 03 58 10 add 0x10(%rax),%rbx
b: 48 89 58 10 mov %rbx,0x10(%rax)
f: 48 81 fb 00 00 10 00 cmp $0x100000,%rbx
16: 77 5b ja 0x73
18: 41 bc 01 00 00 00 mov $0x1,%r12d
1e: 4d 85 ed test %r13,%r13
21: 74 3f je 0x62
23: e8 a9 3e d4 ff callq 0xffd43ed1
28: fb sti
29: 5b pop %rbx
* 2a: 44 89 e0 mov %r12d,%eax <-- trapping instruction
2d: 5d pop %rbp
2e: 41 5c pop %r12
30: 41 5d pop %r13
32: 41 5e pop %r14
34: c3 retq
35: e8 97 3d d4 ff callq 0xffd43dd1
3a: 48 rex.W
3b: c7 .byte 0xc7
3c: c3 retq
3d: 80 .byte 0x80
3e: 4b rex.WXB
3f: 03 .byte 0x3