------------[ cut here ]------------
kernfs_put: syz2/pids.events: released with incorrect active_ref 0
WARNING: CPU: 1 PID: 31395 at fs/kernfs/dir.c:531 kernfs_put.part.0+0x433/0x540
Modules linked in:
CPU: 1 PID: 31395 Comm: kworker/1:2 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:ffff88803ac67bd8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffff8880399f8000 RSI: ffffffff812b6848 RDI: ffffed100758cf6d
RBP: ffff88803525eb18 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88803525eae0
------------[ cut here ]------------
R13: ffff888019de7cb0 R14: 0000000000000000 R15: ffff88800f124a50
WARNING: CPU: 0 PID: 111 at fs/kernfs/dir.c:504 kernfs_get.part.0+0x69/0x80
FS: 0000000000000000(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
Modules linked in:
CPU: 0 PID: 111 Comm: systemd-journal Not tainted 5.19.0-rc4-next-20220701 #1
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
CR2: 00005555555d7c58 CR3: 000000003a01a000 CR4: 0000000000350ee0
RIP: 0010:kernfs_get.part.0+0x69/0x80
Call Trace:
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
kernfs_put+0x42/0x50
RSP: 0018:ffff88806ce09c80 EFLAGS: 00010046
kernfs_notify_workfn+0x417/0x560
RAX: 0000000000000000 RBX: ffff88803525eae0 RCX: 0000000000000100
RDX: ffff88800fad8000 RSI: ffffffff819d2579 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
process_one_work+0xa0f/0x1690
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R13: 1ffffffff0a01e40 R14: ffff88803525eae0 R15: ffff8880083ddd30
FS: 00007f8f9860a900(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
worker_thread+0x637/0x1250
CR2: 00007f8f97a9cce0 CR3: 000000000eece000 CR4: 0000000000350ef0
Call Trace:
kernfs_get+0x1b/0x30
kthread+0x2ed/0x3a0
kernfs_notify+0x180/0x350
cgroup_file_notify+0xf5/0x1a0
ret_from_fork+0x22/0x30
call_timer_fn+0x17d/0x5f0
irq event stamp: 757423
hardirqs last enabled at (757429): [] vprintk_emit+0x4fe/0x550
hardirqs last disabled at (757438): [] console_emit_next_record.constprop.0+0x667/0x800
softirqs last enabled at (757102): [] __irq_exit_rcu+0x113/0x170
softirqs last disabled at (756997): [] __irq_exit_rcu+0x113/0x170
---[ end trace 0000000000000000 ]---
__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:lock_acquire+0x1db/0x530
Code: 02 b8 ff ff ff ff 65 0f c1 05 f9 6a d9 7e 83 f8 01 0f 85 c4 02 00 00 48 83 7c 24 08 00 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24
RSP: 0018:ffff8880186ff288 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 1ffff110030dfe53 RCX: 00000000e3c76f22
RDX: 1ffff11001f5b12e RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff86a5c7c7
R10: fffffbfff0d4b8f8 R11: 0000000000000001 R12: 0000000000000002
R13: 0000000000000000 R14: ffffffff852049a0 R15: 0000000000000000
__is_insn_slot_addr+0x3d/0x250
kernel_text_address+0x40/0xb0
__kernel_text_address+0x9/0x30
unwind_get_return_address+0x51/0x90
arch_stack_walk+0x99/0xf0
stack_trace_save+0x8c/0xc0
__create_object.isra.0+0x389/0xc10
kmem_cache_alloc_lru+0x2e0/0x7e0
__d_alloc+0x31/0x990
d_alloc_parallel+0x10a/0x1c00
__lookup_slow+0x193/0x490
walk_component+0x411/0x6a0
link_path_walk.part.0+0x7f8/0xf80
path_openat+0x25d/0x2890
do_filp_open+0x1aa/0x400
do_sys_openat2+0x16d/0x4c0
__x64_sys_openat+0x13f/0x1f0
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f8f98ec3c64
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
RSP: 002b:00007ffdea7dca40 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000055cda6428d60 RCX: 00007f8f98ec3c64
RDX: 0000000000080802 RSI: 000055cda642e240 RDI: 00000000ffffff9c
RBP: 000055cda642e240 R08: 0000000000000000 R09: ffffffffffffff01
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000080802
R13: 00000000fffffffa R14: 000055cda646a970 R15: 0000000000000002
irq event stamp: 526965
hardirqs last enabled at (526964): [] _raw_spin_unlock_irq+0x1f/0x40
hardirqs last disabled at (526965): [] _raw_spin_lock_irqsave+0x4e/0x50
softirqs last enabled at (526638): [] __irq_exit_rcu+0x113/0x170
softirqs last disabled at (526961): [] __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 ffff88803525eae0 by task systemd-journal/111
CPU: 0 PID: 111 Comm: systemd-journal 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
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:lock_acquire+0x1db/0x530
Code: 02 b8 ff ff ff ff 65 0f c1 05 f9 6a d9 7e 83 f8 01 0f 85 c4 02 00 00 48 83 7c 24 08 00 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24
RSP: 0018:ffff8880186ff288 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 1ffff110030dfe53 RCX: 00000000e3c76f22
RDX: 1ffff11001f5b12e RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff86a5c7c7
R10: fffffbfff0d4b8f8 R11: 0000000000000001 R12: 0000000000000002
R13: 0000000000000000 R14: ffffffff852049a0 R15: 0000000000000000
__is_insn_slot_addr+0x3d/0x250
kernel_text_address+0x40/0xb0
__kernel_text_address+0x9/0x30
unwind_get_return_address+0x51/0x90
arch_stack_walk+0x99/0xf0
stack_trace_save+0x8c/0xc0
__create_object.isra.0+0x389/0xc10
kmem_cache_alloc_lru+0x2e0/0x7e0
__d_alloc+0x31/0x990
d_alloc_parallel+0x10a/0x1c00
__lookup_slow+0x193/0x490
walk_component+0x411/0x6a0
link_path_walk.part.0+0x7f8/0xf80
path_openat+0x25d/0x2890
do_filp_open+0x1aa/0x400
do_sys_openat2+0x16d/0x4c0
__x64_sys_openat+0x13f/0x1f0
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f8f98ec3c64
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
RSP: 002b:00007ffdea7dca40 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000055cda6428d60 RCX: 00007f8f98ec3c64
RDX: 0000000000080802 RSI: 000055cda642e240 RDI: 00000000ffffff9c
RBP: 000055cda642e240 R08: 0000000000000000 R09: ffffffffffffff01
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000080802
R13: 00000000fffffffa R14: 000055cda646a970 R15: 0000000000000002
Allocated by task 291:
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 31395:
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 ffff88803525eae0
which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 0 bytes inside of
168-byte region [ffff88803525eae0, ffff88803525eb88)
The buggy address belongs to the physical page:
page:000000009ef57e0d refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3525e
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:
ffff88803525e980: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc 00
ffff88803525ea00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88803525ea80: 00 00 00 00 fc fc fc fc fc fc fc fc fa fb fb fb
^
ffff88803525eb00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88803525eb80: fb fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00
==================================================================
kmemleak: 8 new suspected memory leaks (see /sys/kernel/debug/kmemleak)
----------------
Code disassembly (best guess):
0: 02 b8 ff ff ff ff add -0x1(%rax),%bh
6: 65 0f c1 05 f9 6a d9 xadd %eax,%gs:0x7ed96af9(%rip) # 0x7ed96b07
d: 7e
e: 83 f8 01 cmp $0x1,%eax
11: 0f 85 c4 02 00 00 jne 0x2db
17: 48 83 7c 24 08 00 cmpq $0x0,0x8(%rsp)
1d: 74 01 je 0x20
1f: fb sti
20: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
27: fc ff df
* 2a: 48 01 c3 add %rax,%rbx <-- trapping instruction
2d: 48 c7 03 00 00 00 00 movq $0x0,(%rbx)
34: 48 c7 43 08 00 00 00 movq $0x0,0x8(%rbx)
3b: 00
3c: 48 rex.W
3d: 8b .byte 0x8b
3e: 84 .byte 0x84
3f: 24 .byte 0x24