------------[ cut here ]------------
kernfs_put: syz1/memory.events.local: released with incorrect active_ref 0
WARNING: CPU: 1 PID: 303 at fs/kernfs/dir.c:531 kernfs_put.part.0+0x433/0x540
Modules linked in:
CPU: 1 PID: 303 Comm: kworker/1:4 Not tainted 5.19.0-rc5-next-20220706 #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
------------[ cut here ]------------
Code: 03 80 3c 18 00 0f 85 ea 00 00 00 4d 8b 7d 38 e8 53 fc a6 ff 48 8b 14 24 44 89 f1 4c 89 fe 48 c7 c7 e0 5b 72 84 e8 13 aa 6c 02 <0f> 0b e9 b9 fc ff ff 48 89 ef e8 0e b3 d9 ff e9 c1 fd ff ff e8 04
WARNING: CPU: 0 PID: 4498 at fs/kernfs/dir.c:504 kernfs_get.part.0+0x69/0x80
RSP: 0018:ffff88802004fbd8 EFLAGS: 00010286
Modules linked in:
CPU: 0 PID: 4498 Comm: syz-executor.4 Not tainted 5.19.0-rc5-next-20220706 #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
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000
Code: 31 ff 89 ee e8 a8 fd a6 ff 85 ed 74 18 e8 cf 00 a7 ff be 04 00 00 00 48 89 df e8 d2 ba d9 ff f0 ff 03 5b 5d c3 e8 b7 00 a7 ff <0f> 0b eb df 48 89 df e8 7b b7 d9 ff eb c6 66 0f 1f 84 00 00 00 00
RDX: ffff888018273580 RSI: ffffffff812bd348 RDI: ffffed1004009f6d
RSP: 0018:ffff88806ce09c80 EFLAGS: 00010046
RBP: ffff88801a36d5a8 R08: 0000000000000005 R09: 0000000000000000
RAX: 0000000000000000 RBX: ffff88801a36d570 RCX: 0000000000000100
RDX: ffff888035470000 RSI: ffffffff819df849 RDI: 0000000000000005
R10: 0000000080000000 R11: 0000000000000001 R12: ffff88801a36d570
RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R13: 1ffffffff0a01e40 R14: ffff88801a36d570 R15: ffff888044c9c4f0
R13: ffff88801d86ebc8 R14: 0000000000000000 R15: ffff888014b23190
FS: 0000555555cce400(0000) GS:ffff88806ce00000(0000) knlGS:0000000000000000
FS: 0000000000000000(0000) GS:ffff88806cf00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f758bf97547 CR3: 000000001bd90000 CR4: 0000000000350ef0
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Call Trace:
kernfs_get+0x1b/0x30
CR2: 0000000000000000 CR3: 0000000016cfc000 CR4: 0000000000350ee0
kernfs_notify+0x180/0x350
Call Trace:
cgroup_file_notify+0xf5/0x1a0
kernfs_put+0x42/0x50
call_timer_fn+0x17d/0x5f0
kernfs_notify_workfn+0x417/0x560
process_one_work+0xa0f/0x1690
__run_timers.part.0+0x65e/0xa50
worker_thread+0x637/0x1250
run_timer_softirq+0xae/0x1a0
kthread+0x2ed/0x3a0
__do_softirq+0x1c8/0x8cc
__irq_exit_rcu+0x113/0x170
ret_from_fork+0x22/0x30
irq_exit_rcu+0x5/0x20
sysvec_apic_timer_interrupt+0x8e/0xc0
irq event stamp: 125047
asm_sysvec_apic_timer_interrupt+0x1b/0x20
hardirqs last enabled at (125057): [] console_emit_next_record.constprop.0+0x648/0x800
RIP: 0010:__memset+0x24/0x30
hardirqs last disabled at (125066): [] console_emit_next_record.constprop.0+0x667/0x800
Code: cc cc cc cc cc cc 0f 1f 44 00 00 49 89 f9 48 89 d1 83 e2 07 48 c1 e9 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 48 ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1 f3
RSP: 0018:ffff8880455f78b8 EFLAGS: 00000212
softirqs last enabled at (124308): [] __irq_exit_rcu+0x113/0x170
RAX: 0000000000000000 RBX: ffff8880455f79a8 RCX: 0000000000000004
softirqs last disabled at (124291): [] __irq_exit_rcu+0x113/0x170
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880455f7960
---[ end trace 0000000000000000 ]---
RBP: ffff888035470000 R08: 0000000000000001 R09: ffff8880455f7910
R10: ffffed1008abef2f R11: 0000000000000001 R12: 0000000000000000
R13: ffff8880455f7938 R14: ffff888035470000 R15: ffff8880455f7910
__unwind_start+0x2a/0x7c0
arch_stack_walk+0x5f/0xf0
stack_trace_save+0x8c/0xc0
kasan_save_stack+0x1e/0x40
__kasan_slab_alloc+0x66/0x80
kmem_cache_alloc_lru+0x246/0x7e0
__d_alloc+0x31/0x990
d_alloc+0x46/0x1c0
__lookup_hash+0xc8/0x190
filename_create+0x1d6/0x4a0
do_symlinkat+0xc4/0x2a0
__x64_sys_symlink+0x75/0x90
==================================================================
do_syscall_64+0x3b/0x90
BUG: KASAN: use-after-free in llist_del_first+0x89/0xa0
entry_SYSCALL_64_after_hwframe+0x46/0xb0
Read of size 8 at addr ffff88801a36d508 by task kworker/1:4/303
RIP: 0033:0x7fd5305d7427
CPU: 1 PID: 303 Comm: kworker/1:4 Tainted: G W 5.19.0-rc5-next-20220706 #1
Code: 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 58 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
RSP: 002b:00007fff368a1bc8 EFLAGS: 00000202
Workqueue: events kernfs_notify_workfn
ORIG_RAX: 0000000000000058
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fd5305d7427
Call Trace:
RDX: 00007fff368a1ca3 RSI: 00007fd530632022 RDI: 00007fff368a1c90
RBP: 0000000000000000 R08: 0000000000000000 R09: 00007fff368a1a60
dump_stack_lvl+0x8b/0xb3
R10: 00007fff368a1917 R11: 0000000000000202 R12: 0000000000000001
print_report.cold+0x5e/0x5e1
R13: 0000000000000001 R14: 0000000000000001 R15: 00007fff368a1c90
kasan_report+0xb1/0x1b0
irq event stamp: 715
hardirqs last enabled at (714): [] _raw_spin_unlock_irq+0x1f/0x40
llist_del_first+0x89/0xa0
hardirqs last disabled at (715): [] _raw_spin_lock_irqsave+0x4e/0x50
kernfs_notify_workfn+0x78/0x560
softirqs last enabled at (0): [] copy_process+0x1dfa/0x6d60
softirqs last disabled at (707): [] __irq_exit_rcu+0x113/0x170
---[ end trace 0000000000000000 ]---
process_one_work+0xa0f/0x1690
worker_thread+0x637/0x1250
kthread+0x2ed/0x3a0
ret_from_fork+0x22/0x30
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 303:
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 ffff88801a36d488
which belongs to the cache kernfs_node_cache of size 168
The buggy address is located 128 bytes inside of
168-byte region [ffff88801a36d488, ffff88801a36d530)
The buggy address belongs to the physical page:
page:0000000089b65c6f refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1a36d
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:
ffff88801a36d400: 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc
ffff88801a36d480: fc fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88801a36d500: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fa fb
^
ffff88801a36d580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801a36d600: fb fb fb fc fc fc fc fc fc fc fc 00 00 00 00 00
==================================================================
loop7: detected capacity change from 0 to 2048
EXT4-fs (loop7): mounted filesystem without journal. Quota mode: writeback.
EXT4-fs (loop7): unmounting filesystem.
SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pid=4527 comm=syz-executor.2
----------------
Code disassembly (best guess):
0: cc int3
1: cc int3
2: cc int3
3: cc int3
4: cc int3
5: cc int3
6: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
b: 49 89 f9 mov %rdi,%r9
e: 48 89 d1 mov %rdx,%rcx
11: 83 e2 07 and $0x7,%edx
14: 48 c1 e9 03 shr $0x3,%rcx
18: 40 0f b6 f6 movzbl %sil,%esi
1c: 48 b8 01 01 01 01 01 movabs $0x101010101010101,%rax
23: 01 01 01
26: 48 0f af c6 imul %rsi,%rax
* 2a: f3 48 ab rep stos %rax,%es:(%rdi) <-- trapping instruction
2d: 89 d1 mov %edx,%ecx
2f: f3 aa rep stos %al,%es:(%rdi)
31: 4c 89 c8 mov %r9,%rax
34: c3 retq
35: 90 nop
36: 49 89 f9 mov %rdi,%r9
39: 40 88 f0 mov %sil,%al
3c: 48 89 d1 mov %rdx,%rcx
3f: f3 repz