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BUG: KCSAN: data-race in assoc_array_apply_edit / search_nested_keyrings

write to 0xffff8881065ffc10 of 8 bytes by task 30966 on cpu 1:
 assoc_array_apply_edit+0x3e/0x660 lib/assoc_array.c:1357
 __key_link+0x8a/0xc0 security/keys/keyring.c:1372
 __key_instantiate_and_link+0x15b/0x290 security/keys/key.c:459
 key_create_or_update+0x750/0x990 security/keys/key.c:941
 __do_sys_add_key security/keys/keyctl.c:134 [inline]
 __se_sys_add_key+0x26f/0x300 security/keys/keyctl.c:74
 __x64_sys_add_key+0x63/0x70 security/keys/keyctl.c:74
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881065ffc10 of 8 bytes by task 30971 on cpu 0:
 search_nested_keyrings+0x34f/0x920 security/keys/keyring.c:751
 keyring_search_rcu+0xf4/0x180 security/keys/keyring.c:922
 search_cred_keyrings_rcu+0x135/0x240 security/keys/process_keys.c:480
 search_process_keyrings_rcu security/keys/process_keys.c:544 [inline]
 lookup_user_key+0xab6/0xd40 security/keys/process_keys.c:762
 __do_sys_add_key security/keys/keyctl.c:126 [inline]
 __se_sys_add_key+0x23a/0x300 security/keys/keyctl.c:74
 __x64_sys_add_key+0x63/0x70 security/keys/keyctl.c:74
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 30971 Comm: syz-executor.1 Not tainted 5.12.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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