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BUG: KCSAN: data-race in assoc_array_apply_edit / search_nested_keyrings

write to 0xffff888107b98250 of 8 bytes by task 31519 on cpu 1:
 assoc_array_apply_edit+0x40/0x640 lib/assoc_array.c:1356
 __key_link+0x8e/0xd0 security/keys/keyring.c:1372
 __key_instantiate_and_link+0x187/0x2c0 security/keys/key.c:459
 __key_create_or_update+0x65d/0x700 security/keys/key.c:930
 key_create_or_update+0x42/0x60 security/keys/key.c:1011
 __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+0x67/0x80 security/keys/keyctl.c:74
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888107b98250 of 8 bytes by task 31526 on cpu 0:
 search_nested_keyrings+0x3db/0x9c0 security/keys/keyring.c:751
 keyring_search_rcu+0xf8/0x190 security/keys/keyring.c:922
 search_cred_keyrings_rcu+0x159/0x3b0 security/keys/process_keys.c:480
 search_process_keyrings_rcu security/keys/process_keys.c:544 [inline]
 lookup_user_key+0x80d/0xde0 security/keys/process_keys.c:762
 __do_sys_add_key security/keys/keyctl.c:126 [inline]
 __se_sys_add_key+0x24b/0x310 security/keys/keyctl.c:74
 __x64_sys_add_key+0x67/0x80 security/keys/keyctl.c:74
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0xffff888104d6f202 -> 0xffff888103780e02

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 31526 Comm: syz-executor.4 Not tainted 6.5.0-rc3-syzkaller-00025-g5f0bc0b042fc #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
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