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BUG: KCSAN: data-race in search_nested_keyrings / search_nested_keyrings

write to 0xffff888101620c60 of 8 bytes by task 27180 on cpu 0:
 search_nested_keyrings+0x79a/0x9b0 security/keys/keyring.c:859
 keyring_search_rcu+0xf7/0x190 security/keys/keyring.c:925
 get_user_session_keyring_rcu security/keys/process_keys.c:208 [inline]
 search_cred_keyrings_rcu+0x2a3/0x3c0 security/keys/process_keys.c:500
 search_process_keyrings_rcu+0x1e/0x190 security/keys/process_keys.c:544
 request_key_and_link+0x14d/0xd70 security/keys/request_key.c:618
 __do_sys_request_key security/keys/keyctl.c:222 [inline]
 __se_sys_request_key+0x1df/0x290 security/keys/keyctl.c:167
 __x64_sys_request_key+0x55/0x70 security/keys/keyctl.c:167
 x64_sys_call+0x1d98/0x3000 arch/x86/include/generated/asm/syscalls_64.h:250
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

write to 0xffff888101620c60 of 8 bytes by task 27179 on cpu 1:
 search_nested_keyrings+0x79a/0x9b0 security/keys/keyring.c:859
 keyring_search_rcu+0xf7/0x190 security/keys/keyring.c:925
 get_user_session_keyring_rcu security/keys/process_keys.c:208 [inline]
 search_cred_keyrings_rcu+0x2a3/0x3c0 security/keys/process_keys.c:500
 search_process_keyrings_rcu+0x1e/0x190 security/keys/process_keys.c:544
 request_key_and_link+0x14d/0xd70 security/keys/request_key.c:618
 __do_sys_request_key security/keys/keyctl.c:222 [inline]
 __se_sys_request_key+0x1df/0x290 security/keys/keyctl.c:167
 __x64_sys_request_key+0x55/0x70 security/keys/keyctl.c:167
 x64_sys_call+0x1d98/0x3000 arch/x86/include/generated/asm/syscalls_64.h:250
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000077359e8e -> 0x0000000077359e90

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 27179 Comm: syz.4.8216 Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
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