------------[ cut here ]------------
kernfs_put: syz0/memory.events: released with incorrect active_ref 0
WARNING: CPU: 0 PID: 12 at fs/kernfs/dir.c:531 kernfs_put.part.0+0x433/0x540
Modules linked in:
CPU: 0 PID: 12 Comm: kworker/0:1 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
------------[ cut here ]------------
Workqueue: events kernfs_notify_workfn
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
RIP: 0010:kernfs_put.part.0+0x433/0x540
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
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
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:ffff88800824fbd8 EFLAGS: 00010286
RSP: 0000:ffff88806cf09c80 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff88800da90cb0 RCX: 0000000000000100
RDX: ffff88800fa31ac0 RSI: ffffffff819d2579 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R13: 1ffffffff0a01e40 R14: ffff88800da90cb0 R15: ffff888046374490
RDX: ffff88800822d040 RSI: ffffffff812b6848 RDI: ffffed1001049f6d
FS: 00007f76123aa900(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
RBP: ffff88800da90ce8 R08: 0000000000000005 R09: 0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f76119b7008 CR3: 000000000e2f6000 CR4: 0000000000350ee0
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800da90cb0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
R13: ffff88801e10f488 R14: 0000000000000000 R15: ffff88800cfc9870
Call Trace:
<IRQ>
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: 000055555594cc58 CR3: 000000003b178000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
call_timer_fn+0x17d/0x5f0
DR3: 0000000000000000 DR6: 00000000ffff4ff0 DR7: 0000000000000400
Call Trace:
<TASK>
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
__irq_exit_rcu+0x113/0x170
worker_thread+0x637/0x1250
irq_exit_rcu+0x5/0x20
sysvec_apic_timer_interrupt+0x8e/0xc0
</IRQ>
<TASK>
kthread+0x2ed/0x3a0
asm_sysvec_apic_timer_interrupt+0x1b/0x20
RIP: 0010:__sanitizer_cov_trace_pc+0x37/0x60
ret_from_fork+0x22/0x30
Code: 81 e1 00 01 00 00 65 48 8b 14 25 c0 6e 02 00 a9 00 01 ff 00 74 0e 85 c9 74 35 8b 82 34 14 00 00 85 c0 74 2b 8b 82 10 14 00 00 <83> f8 02 75 20 48 8b 8a 18 14 00 00 8b 92 14 14 00 00 48 8b 01 48
</TASK>
RSP: 0000:ffff888018727c78 EFLAGS: 00000246
irq event stamp: 1598451
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff88800fa31ac0 RSI: ffffffff821709de RDI: 0000000000000005
hardirqs last enabled at (1598461): [<ffffffff812b2b18>] console_emit_next_record.constprop.0+0x648/0x800
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000003
hardirqs last disabled at (1598470): [<ffffffff8418afab>] sysvec_apic_timer_interrupt+0xb/0xc0
R10: 0000000000000001 R11: 0000000000000001 R12: 00007f76123aefff
softirqs last enabled at (1598052): [<ffffffff811662a3>] __irq_exit_rcu+0x113/0x170
R13: ffff88800cdea00c R14: ffff88800819b100 R15: 0000000000000000
softirqs last disabled at (1597987): [<ffffffff811662a3>] __irq_exit_rcu+0x113/0x170
mtree_range_walk+0x52e/0x8e0
mt_find+0x3e2/0xfd0
---[ end trace 0000000000000000 ]---
find_vma+0x108/0x1a0
do_user_addr_fault+0x382/0x1300
exc_page_fault+0x98/0x1a0
asm_exc_page_fault+0x27/0x30
RIP: 0033:0x7f7612cd7a71
Code: fa ff 0f 1f 80 00 00 00 00 48 89 f8 48 83 fa 20 0f 82 b8 00 00 00 48 83 fa 40 0f 87 1b 01 00 00 c5 fe 6f 06 c5 fe 6f 4c 16 e0 <c5> fe 7f 07 c5 fe 7f 4c 17 e0 c5 f8 77 c3 90 48 39 d1 0f 82 b7 95
RSP: 002b:00007ffc3bad1588 EFLAGS: 00010283
RAX: 00007f76119b7008 RBX: 000055bb5d275620 RCX: 00007f76119b6fc8
RDX: 0000000000000026 RSI: 000055bb5d275620 RDI: 00007f76119b7008
RBP: 000055bb5d2742b0 R08: 0000000000000001 R09: 0000000000223fc8
R10: 0000000000000002 R11: 0000000000242836 R12: 0000000000000026
R13: 5fa1cff3b3c2c040 R14: 0000000000000000 R15: 00007ffc3bad15b0
</TASK>
irq event stamp: 2572837
hardirqs last enabled at (2572836): [<ffffffff841aba4f>] _raw_spin_unlock_irq+0x1f/0x40
hardirqs last disabled at (2572837): [<ffffffff841ab87e>] _raw_spin_lock_irqsave+0x4e/0x50
softirqs last enabled at (2572356): [<ffffffff8188f305>] __mark_inode_dirty+0xba5/0xf00
softirqs last disabled at (2572833): [<ffffffff811662a3>] __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 ffff88800da90cb0 by task systemd-journal/112
CPU: 1 PID: 112 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:
<IRQ>
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
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1b/0x20
RIP: 0010:__sanitizer_cov_trace_pc+0x37/0x60
Code: 81 e1 00 01 00 00 65 48 8b 14 25 c0 6e 02 00 a9 00 01 ff 00 74 0e 85 c9 74 35 8b 82 34 14 00 00 85 c0 74 2b 8b 82 10 14 00 00 <83> f8 02 75 20 48 8b 8a 18 14 00 00 8b 92 14 14 00 00 48 8b 01 48
RSP: 0000:ffff888018727c78 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: ffff88800fa31ac0 RSI: ffffffff821709de RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000003
R10: 0000000000000001 R11: 0000000000000001 R12: 00007f76123aefff
R13: ffff88800cdea00c R14: ffff88800819b100 R15: 0000000000000000
mtree_range_walk+0x52e/0x8e0
mt_find+0x3e2/0xfd0
find_vma+0x108/0x1a0
do_user_addr_fault+0x382/0x1300
exc_page_fault+0x98/0x1a0
asm_exc_page_fault+0x27/0x30
RIP: 0033:0x7f7612cd7a71
Code: fa ff 0f 1f 80 00 00 00 00 48 89 f8 48 83 fa 20 0f 82 b8 00 00 00 48 83 fa 40 0f 87 1b 01 00 00 c5 fe 6f 06 c5 fe 6f 4c 16 e0 <c5> fe 7f 07 c5 fe 7f 4c 17 e0 c5 f8 77 c3 90 48 39 d1 0f 82 b7 95
RSP: 002b:00007ffc3bad1588 EFLAGS: 00010283
RAX: 00007f76119b7008 RBX: 000055bb5d275620 RCX: 00007f76119b6fc8
RDX: 0000000000000026 RSI: 000055bb5d275620 RDI: 00007f76119b7008
RBP: 000055bb5d2742b0 R08: 0000000000000001 R09: 0000000000223fc8
R10: 0000000000000002 R11: 0000000000242836 R12: 0000000000000026
R13: 5fa1cff3b3c2c040 R14: 0000000000000000 R15: 00007ffc3bad15b0
</TASK>
Allocated by task 294:
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 12:
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 ffff88800da90cb0
which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 0 bytes inside of
168-byte region [ffff88800da90cb0, ffff88800da90d58)
The buggy address belongs to the physical page:
page:000000004f37028f refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xda90
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:
ffff88800da90b80: 00 fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00
ffff88800da90c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc
>ffff88800da90c80: fc fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb
^
ffff88800da90d00: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc
ffff88800da90d80: fc fc fc 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
ata2.00: qc timeout (cmd 0xa0)
ata2: found unknown device (class 0)
----------------
Code disassembly (best guess):
0: 81 e1 00 01 00 00 and $0x100,%ecx
6: 65 48 8b 14 25 c0 6e mov %gs:0x26ec0,%rdx
d: 02 00
f: a9 00 01 ff 00 test $0xff0100,%eax
14: 74 0e je 0x24
16: 85 c9 test %ecx,%ecx
18: 74 35 je 0x4f
1a: 8b 82 34 14 00 00 mov 0x1434(%rdx),%eax
20: 85 c0 test %eax,%eax
22: 74 2b je 0x4f
24: 8b 82 10 14 00 00 mov 0x1410(%rdx),%eax
* 2a: 83 f8 02 cmp $0x2,%eax <-- trapping instruction
2d: 75 20 jne 0x4f
2f: 48 8b 8a 18 14 00 00 mov 0x1418(%rdx),%rcx
36: 8b 92 14 14 00 00 mov 0x1414(%rdx),%edx
3c: 48 8b 01 mov (%rcx),%rax
3f: 48 rex.W