------------[ cut here ]------------
kernfs_put: syz0/pids.events: released with incorrect active_ref 0
WARNING: CPU: 0 PID: 13052 at fs/kernfs/dir.c:531 kernfs_put.part.0+0x433/0x540
Modules linked in:
CPU: 0 PID: 13052 Comm: kworker/0:1 Not tainted 5.19.0-rc5-next-20220705 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
------------[ cut here ]------------
Workqueue: events kernfs_notify_workfn
WARNING: CPU: 1 PID: 84 at fs/kernfs/dir.c:504 kernfs_get.part.0+0x69/0x80
RIP: 0010:kernfs_put.part.0+0x433/0x540
Modules linked in:
CPU: 1 PID: 84 Comm: jbd2/sda-8 Not tainted 5.19.0-rc5-next-20220705 #1
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 ac 6c 02 <0f> 0b e9 b9 fc ff ff 48 89 ef e8 0e b3 d9 ff e9 c1 fd ff ff e8 04
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
RSP: 0018:ffff8880490afbd8 EFLAGS: 00010286
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:ffff88806cf09c80 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff88801b87aae0 RCX: 0000000000000100
RDX: ffff88800fb30000 RSI: ffffffff819de5c9 RDI: 0000000000000005
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R13: 1ffffffff0a01e40 R14: ffff88801b87aae0 R15: ffff88800f5f6930
RDX: ffff888045171ac0 RSI: ffffffff812bd348 RDI: ffffed1009215f6d
FS: 0000000000000000(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
RBP: ffff88801b87ab18 R08: 0000000000000005 R09: 0000000000000000
CR2: 0000555557208c58 CR3: 000000003be42000 CR4: 0000000000350ee0
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88801b87aae0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
R13: ffff88800f411740 R14: 0000000000000000 R15: ffff888014c75640
Call Trace:
kernfs_get+0x1b/0x30
FS: 0000000000000000(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
kernfs_notify+0x180/0x350
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
cgroup_file_notify+0xf5/0x1a0
CR2: 0000001b2df31000 CR3: 0000000016d84000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
call_timer_fn+0x17d/0x5f0
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
Call Trace:
kernfs_put+0x42/0x50
kernfs_notify_workfn+0x417/0x560
__run_timers.part.0+0x65e/0xa50
process_one_work+0xa0f/0x1690
run_timer_softirq+0xae/0x1a0
__do_softirq+0x1c8/0x8cc
worker_thread+0x637/0x1250
__irq_exit_rcu+0x113/0x170
irq_exit_rcu+0x5/0x20
kthread+0x2ed/0x3a0
sysvec_apic_timer_interrupt+0x8e/0xc0
ret_from_fork+0x22/0x30
asm_sysvec_apic_timer_interrupt+0x1b/0x20
irq event stamp: 163453
RIP: 0010:_raw_spin_unlock_irqrestore+0x2e/0x50
Code: 48 83 c7 18 53 48 89 f3 48 8b 74 24 10 e8 7a 60 0d fd 48 89 ef e8 e2 e1 0d fd 80 e7 02 74 06 e8 b8 b4 2f fd fb bf 01 00 00 00 bd 83 03 fd 65 8b 05 36 60 e6 7b 85 c0 74 03 5b 5d c3 0f 1f 44
hardirqs last enabled at (163463): [] console_emit_next_record.constprop.0+0x648/0x800
RSP: 0018:ffff88800fb3f3a8 EFLAGS: 00000202
RAX: 00000000004cdce3 RBX: 0000000000000246 RCX: 1ffffffff0b1ceb1
hardirqs last disabled at (163472): [] console_emit_next_record.constprop.0+0x667/0x800
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
softirqs last enabled at (162852): [] srcu_invoke_callbacks+0x1e5/0x3a0
RBP: ffff888008a95400 R08: 0000000000000001 R09: 0000000000000001
softirqs last disabled at (162848): [] srcu_invoke_callbacks+0x1b5/0x3a0
R10: ffffed1001152a80 R11: 0000000000000001 R12: 0000000000000000
---[ end trace 0000000000000000 ]---
R13: 0000000000000246 R14: ffff88800bc38010 R15: ffff88800946c000
==================================================================
BUG: KASAN: use-after-free in llist_del_first+0x89/0xa0
ata_scsi_queuecmd+0xd8/0x160
Read of size 8 at addr ffff88801b87ab60 by task kworker/0:1/13052
CPU: 0 PID: 13052 Comm: kworker/0:1 Tainted: G W 5.19.0-rc5-next-20220705 #1
scsi_queue_rq+0x1811/0x31e0
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
blk_mq_dispatch_rq_list+0x6c2/0x21d0
Workqueue: events kernfs_notify_workfn
Call Trace:
dump_stack_lvl+0x8b/0xb3
blk_mq_do_dispatch_sched+0x916/0xc30
print_report.cold+0x5e/0x5e1
__blk_mq_sched_dispatch_requests+0x26d/0x3e0
kasan_report+0xb1/0x1b0
llist_del_first+0x89/0xa0
kernfs_notify_workfn+0x78/0x560
blk_mq_sched_dispatch_requests+0x106/0x190
__blk_mq_run_hw_queue+0xff/0x350
__blk_mq_delay_run_hw_queue+0x465/0x670
process_one_work+0xa0f/0x1690
blk_mq_run_hw_queue+0x33b/0x490
blk_mq_sched_insert_requests+0x1d8/0x9a0
blk_mq_flush_plug_list+0x37a/0xd70
worker_thread+0x637/0x1250
__blk_flush_plug+0x289/0x420
kthread+0x2ed/0x3a0
ret_from_fork+0x22/0x30
Allocated by task 295:
kasan_save_stack+0x1e/0x40
blk_finish_plug+0x50/0xa0
__kasan_slab_alloc+0x66/0x80
jbd2_journal_commit_transaction+0x32f9/0x6780
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
kjournald2+0x1d1/0x930
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 13052:
kthread+0x2ed/0x3a0
kasan_save_stack+0x1e/0x40
kasan_set_track+0x21/0x30
ret_from_fork+0x22/0x30
kasan_set_free_info+0x20/0x30
__kasan_slab_free+0x108/0x190
irq event stamp: 5037289
kmem_cache_free+0xfb/0x600
hardirqs last enabled at (5037288): [] _raw_spin_unlock_irq+0x1f/0x40
kernfs_put.part.0+0x2c7/0x540
hardirqs last disabled at (5037289): [] _raw_spin_lock_irqsave+0x4e/0x50
kernfs_put+0x42/0x50
softirqs last enabled at (5037172): [] __irq_exit_rcu+0x113/0x170
kernfs_notify_workfn+0x417/0x560
softirqs last disabled at (5037285): [] __irq_exit_rcu+0x113/0x170
process_one_work+0xa0f/0x1690
---[ end trace 0000000000000000 ]---
worker_thread+0x637/0x1250
kthread+0x2ed/0x3a0
ret_from_fork+0x22/0x30
The buggy address belongs to the object at ffff88801b87aae0
which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 128 bytes inside of
168-byte region [ffff88801b87aae0, ffff88801b87ab88)
The buggy address belongs to the physical page:
page:00000000e3f7a920 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1b87a
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:
ffff88801b87aa00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff88801b87aa80: 00 00 00 00 fc fc fc fc fc fc fc fc fa fb fb fb
>ffff88801b87ab00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88801b87ab80: fb fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00
ffff88801b87ac00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc
==================================================================
----------------
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 7a 60 0d fd callq 0xfd0d608c
12: 48 89 ef mov %rbp,%rdi
15: e8 e2 e1 0d fd callq 0xfd0de1fc
1a: 80 e7 02 and $0x2,%bh
1d: 74 06 je 0x25
1f: e8 b8 b4 2f fd callq 0xfd2fb4dc
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 bd 83 03 fd callq 0xfd0383ec <-- trapping instruction
2f: 65 8b 05 36 60 e6 7b mov %gs:0x7be66036(%rip),%eax # 0x7be6606c
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