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BUG: KCSAN: data-race in assoc_array_apply_edit / search_nested_keyrings

write to 0xffff8881316c6190 of 8 bytes by task 9969 on cpu 1:
 assoc_array_apply_edit+0x3c/0x650 lib/assoc_array.c:1356
 __key_link+0x8a/0xc0 security/keys/keyring.c:1372
 __key_instantiate_and_link+0x15b/0x290 security/keys/key.c:459
 key_create_or_update+0x662/0x6f0 security/keys/key.c:941
 __do_sys_add_key security/keys/keyctl.c:134 [inline]
 __se_sys_add_key+0x280/0x310 security/keys/keyctl.c:74
 __x64_sys_add_key+0x63/0x70 security/keys/keyctl.c:74
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881316c6190 of 8 bytes by task 9974 on cpu 0:
 search_nested_keyrings+0x374/0xa50 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+0xaa7/0xd90 security/keys/process_keys.c:762
 keyctl_read_key+0x29/0x390 security/keys/keyctl.c:834
 __do_sys_keyctl security/keys/keyctl.c:1911 [inline]
 __se_sys_keyctl+0x359/0x9e0 security/keys/keyctl.c:1869
 __x64_sys_keyctl+0x63/0x70 security/keys/keyctl.c:1869
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0xffff888126d8b002 -> 0xffff888127b0cc02

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 9974 Comm: syz-executor.0 Not tainted 5.18.0-rc4-syzkaller-00083-g259b897e5a79-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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