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BUG: KASAN: use-after-free in __lock_acquire+0x42c9/0x5e70
Read of size 8 at addr ffff888047f94818 by task syz-executor.0/12834

CPU: 1 PID: 12834 Comm: syz-executor.0 Not tainted 6.1.0-rc8-next-20221208 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0x8f/0xb7
 print_report+0x175/0x478
 kasan_report+0xbf/0x1c0
 __lock_acquire+0x42c9/0x5e70
 lock_acquire+0x1a6/0x530
 _raw_spin_lock_irqsave+0x3d/0x60
 put_pmu_ctx+0xad/0x2f0
 _free_event+0x2dc/0x1210
 free_event+0x58/0xc0
 __do_sys_perf_event_open+0x671/0x2920
 do_syscall_64+0x3f/0x90
 entry_SYSCALL_64_after_hwframe+0x72/0xdc
RIP: 0033:0x7fba5421cb19
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:00007fba51771188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007fba54330020 RCX: 00007fba5421cb19
RDX: ffffffffffffffff RSI: 0000000000000258 RDI: 0000000020000080
RBP: 00007fba54276f6d R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffda1ca6a6f R14: 00007fba51771300 R15: 0000000000022000
 </TASK>

Allocated by task 12829:
 kasan_save_stack+0x22/0x50
 kasan_set_track+0x25/0x30
 __kasan_kmalloc+0x82/0x90
 find_get_context+0xcc/0x800
 __do_sys_perf_event_open+0x967/0x2920
 do_syscall_64+0x3f/0x90
 entry_SYSCALL_64_after_hwframe+0x72/0xdc

Freed by task 19:
 kasan_save_stack+0x22/0x50
 kasan_set_track+0x25/0x30
 kasan_save_free_info+0x2e/0x50
 __kasan_slab_free+0x10a/0x190
 __kmem_cache_free+0xcf/0x410
 rcu_core+0x7e2/0x2090
 __do_softirq+0x1c7/0x8f9

Last potentially related work creation:
 kasan_save_stack+0x22/0x50
 __kasan_record_aux_stack+0x95/0xb0
 __call_rcu_common.constprop.0+0x6a/0xa40
 put_ctx+0x116/0x1e0
 perf_event_exit_task+0x4d6/0x6b0
 do_exit+0xa9e/0x2720
 do_group_exit+0xd4/0x2a0
 __x64_sys_exit_group+0x3e/0x50
 do_syscall_64+0x3f/0x90
 entry_SYSCALL_64_after_hwframe+0x72/0xdc

The buggy address belongs to the object at ffff888047f94800
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
 512-byte region [ffff888047f94800, ffff888047f94a00)

The buggy address belongs to the physical page:
page:000000007d96cb04 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x47f94
head:000000007d96cb04 order:2 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0
flags: 0x100000000010200(slab|head|node=0|zone=1)
raw: 0100000000010200 ffff888008441c80 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888047f94700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888047f94780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888047f94800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                            ^
 ffff888047f94880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888047f94900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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