------------[ cut here ]------------
kernfs_put: syz6/memory.events: released with incorrect active_ref 0
WARNING: CPU: 0 PID: 5146 at fs/kernfs/dir.c:531 kernfs_put.part.0+0x433/0x540
Modules linked in:
CPU: 0 PID: 5146 Comm: kworker/0:0 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_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
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5146 at fs/kernfs/dir.c:504 kernfs_get.part.0+0x69/0x80
Modules linked in:
CPU: 0 PID: 5146 Comm: kworker/0:0 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: ffff888042dd9658 RCX: 0000000000000100
RDX: ffff8880454d5040 RSI: ffffffff819de5c9 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R13: 1ffffffff0a01e40 R14: ffff888042dd9658 R15: ffff888044e04490
FS: 0000000000000000(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0c803393a4 CR3: 000000000d85e000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
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 01 5e 19 00 4d 85 f6 0f 85 76 01 00 00 03 61 19 00 48 b8 00 00 00 00 00 fc ff df 48 03 04 24 48 c7 00
RSP: 0018:ffff88800d917630 EFLAGS: 00000206
RAX: 0000000000006cd7 RBX: 0000000000000000 RCX: ffffffff8128d13f
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff88800d9177d8 R08: 0000000000000001 R09: ffffffff86a5e7c7
R10: fffffbfff0d4bcf8 R11: 0000000000000001 R12: 0000000000000001
R13: ffffffff86daaba0 R14: 0000000000000200 R15: ffffffff8549fd38
console_unlock+0x36c/0x590
vprintk_emit+0x1b9/0x550
vprintk+0x80/0x90
_printk+0xba/0xed
show_opcodes.cold+0x1c/0x21
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 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:ffff88800d917bd8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffff8880454d5040 RSI: ffffffff812bd348 RDI: ffffed1001b22f6d
RBP: ffff888042dd9690 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000001 R12: ffff888042dd9658
R13: ffff888043542d98 R14: 0000000000000000 R15: ffff88800bc0a528
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: 27873
hardirqs last enabled at (27872): [] _raw_spin_unlock_irq+0x1f/0x40
hardirqs last disabled at (27873): [] _raw_spin_lock_irqsave+0x4e/0x50
softirqs last enabled at (27664): [] srcu_invoke_callbacks+0x1e5/0x3a0
softirqs last disabled at (27867): [] __irq_exit_rcu+0x113/0x170
---[ end trace 0000000000000000 ]---
RSP: 0018:ffff88800d917bd8 EFLAGS: 00010286
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: ffff8880454d5040 RSI: ffffffff812bd348 RDI: ffffed1001b22f6d
RBP: ffff888042dd9690 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000001 R12: ffff888042dd9658
R13: ffff888043542d98 R14: 0000000000000000 R15: ffff88800bc0a528
FS: 0000000000000000(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0c803393a4 CR3: 000000000d85e000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
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: 29341
hardirqs last enabled at (29351): [] __up_console_sem+0x78/0x80
hardirqs last disabled at (29362): [] __up_console_sem+0x5d/0x80
softirqs last enabled at (28790): [] __irq_exit_rcu+0x113/0x170
softirqs last disabled at (28639): [] __irq_exit_rcu+0x113/0x170
---[ end trace 0000000000000000 ]---
==================================================================
BUG: KASAN: use-after-free in kernfs_notify+0x327/0x350
Read of size 2 at addr ffff888042dd96f0 by task syz-executor.6/5238
CPU: 0 PID: 5238 Comm: syz-executor.6 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
Call Trace:
dump_stack_lvl+0x8b/0xb3
print_report.cold+0x5e/0x5e1
kasan_report+0xb1/0x1b0
kernfs_notify+0x327/0x350
cgroup_file_notify+0xf5/0x1a0
try_charge_memcg+0x46c/0x1440
mem_cgroup_charge_skmem+0x7c/0x1b0
sock_setsockopt+0x2080/0x34a0
__sys_setsockopt+0x258/0x2a0
__x64_sys_setsockopt+0xba/0x150
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f5e92518b19
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5e8fa8e188 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f5e9262bf60 RCX: 00007f5e92518b19
RDX: 0000000000000049 RSI: 0000000000000001 RDI: 0000000000000006
RBP: 00007f5e92572f6d R08: 0000000000000010 R09: 0000000000000000
R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc37c9d1cf R14: 00007f5e8fa8e300 R15: 0000000000022000
Allocated by task 559:
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 5146:
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 ffff888042dd9658
which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 152 bytes inside of
168-byte region [ffff888042dd9658, ffff888042dd9700)
The buggy address belongs to the physical page:
page:00000000f0bdb8e5 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x42dd9
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:
ffff888042dd9580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff888042dd9600: 00 00 00 fc fc fc fc fc fc fc fc fa fb fb fb fb
>ffff888042dd9680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888042dd9700: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
ffff888042dd9780: 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc
==================================================================
loop2: detected capacity change from 0 to 4
loop7: detected capacity change from 0 to 40
EXT4-fs: Mount option "noacl" will be removed by 3.5
Contact linux-ext4@vger.kernel.org if you think we should keep it.
EXT4-fs (loop2): VFS: Can't find ext4 filesystem
loop5: detected capacity change from 0 to 512
EXT4-fs: Mount option "noacl" will be removed by 3.5
Contact linux-ext4@vger.kernel.org if you think we should keep it.
loop2: detected capacity change from 0 to 4
EXT4-fs: Mount option "noacl" will be removed by 3.5
Contact linux-ext4@vger.kernel.org if you think we should keep it.
EXT4-fs (loop2): VFS: Can't find ext4 filesystem
EXT4-fs (loop5): VFS: Can't find ext4 filesystem
loop7: detected capacity change from 0 to 40
BUG: unable to handle page fault for address: ffffebde04000008
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 0 P4D 0
Oops: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 1 PID: 5276 Comm: systemd-udevd 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
RIP: 0010:qlist_free_all+0xaf/0x190
Code: 80 4c 01 c2 0f 82 f0 00 00 00 48 c7 c0 00 00 00 80 48 2b 05 c3 82 7b 03 48 01 d0 48 c1 e8 0c 48 c1 e0 06 48 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
RSP: 0018:ffff888043e9faa0 EFLAGS: 00010286
RAX: ffffebde04000000 RBX: 0000000100000000 RCX: 1ffffffff0b1d55d
RDX: 0000000180000000 RSI: 0000000000000008 RDI: ffffffff81770c31
RBP: 0000000000000000 R08: 0000000100000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: dffffc0000000000
R13: ffff888043e9fae0 R14: 0000000000000000 R15: ffff88800d10cd9c
FS: 00007feb73c0c8c0(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffebde04000008 CR3: 0000000008b1c000 CR4: 0000000000350ee0
Call Trace:
kasan_quarantine_reduce+0x180/0x200
__kasan_slab_alloc+0x78/0x80
kmem_cache_alloc+0x1b1/0x490
mas_alloc_nodes+0x36e/0x6a0
mas_preallocate+0xff/0x2d0
do_mas_align_munmap.constprop.0+0x111/0xff0
do_mas_munmap+0x1e8/0x2b0
__vm_munmap+0x14c/0x280
__x64_sys_munmap+0x55/0x80
do_syscall_64+0x3b/0x90
entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7feb740c5bf7
Code: 38 eb 85 48 8b 15 99 52 0c 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb 85 66 2e 0f 1f 84 00 00 00 00 00 90 b8 0b 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 69 52 0c 00 f7 d8 64 89 01 48
RSP: 002b:00007ffc52a11928 EFLAGS: 00000206 ORIG_RAX: 000000000000000b
RAX: ffffffffffffffda RBX: 000055aeea27db58 RCX: 00007feb740c5bf7
RDX: 00000000ffffffff RSI: 0000000000a38e0a RDI: 00007feb72897000
RBP: 000055aeec5db520 R08: c6f63b2a1fbec7a1 R09: 8b895935f36dda33
R10: 3294930ece776c5c R11: 0000000000000206 R12: 000055aeec623f70
R13: 000055aeec604460 R14: 00007ffc52a11a00 R15: 000055aeec606a50
Modules linked in:
CR2: ffffebde04000008
---[ end trace 0000000000000000 ]---
RIP: 0010:qlist_free_all+0xaf/0x190
Code: 80 4c 01 c2 0f 82 f0 00 00 00 48 c7 c0 00 00 00 80 48 2b 05 c3 82 7b 03 48 01 d0 48 c1 e8 0c 48 c1 e0 06 48 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
RSP: 0018:ffff888043e9faa0 EFLAGS: 00010286
RAX: ffffebde04000000 RBX: 0000000100000000 RCX: 1ffffffff0b1d55d
RDX: 0000000180000000 RSI: 0000000000000008 RDI: ffffffff81770c31
RBP: 0000000000000000 R08: 0000000100000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: dffffc0000000000
R13: ffff888043e9fae0 R14: 0000000000000000 R15: ffff88800d10cd9c
FS: 00007feb73c0c8c0(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffebde04000008 CR3: 0000000008b1c000 CR4: 0000000000350ee0
----------------
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 01 5e 19 00 callq 0x195e22
21: 4d 85 f6 test %r14,%r14
24: 0f 85 76 01 00 00 jne 0x1a0
* 2a: e8 03 61 19 00 callq 0x196132 <-- 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