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BUG: KCSAN: data-race in assoc_array_apply_edit / search_nested_keyrings

write to 0xffff888119268550 of 8 bytes by task 6441 on cpu 1:
 assoc_array_apply_edit+0x3e/0x660 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+0x760/0x9a0 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+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888119268550 of 8 bytes by task 6440 on cpu 0:
 search_nested_keyrings+0x36f/0x940 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+0x1a/0x190 security/keys/process_keys.c:544
 key_get_instantiation_authkey+0x106/0x1a0 security/keys/request_key_auth.c:265
 keyctl_assume_authority+0x30/0x1b0 security/keys/keyctl.c:1532
 __do_sys_keyctl security/keys/keyctl.c:1943 [inline]
 __se_sys_keyctl+0x4dc/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+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0xffff888116ed5e02 -> 0xffff888116fed802

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 6440 Comm: syz-executor.0 Not tainted 5.16.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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