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BUG: KCSAN: data-race in tomoyo_domain_quota_is_ok / tomoyo_merge_path_acl

write to 0xffff888029a09c9a of 2 bytes by task 23226 on cpu 0:
 tomoyo_merge_path_acl+0x4c/0x70 security/tomoyo/file.c:372
 tomoyo_update_domain+0x337/0x3a0 security/tomoyo/domain.c:131
 tomoyo_update_path_acl security/tomoyo/file.c:398 [inline]
 tomoyo_write_file+0x210/0x910 security/tomoyo/file.c:1022
 tomoyo_write_domain2 security/tomoyo/common.c:1152 [inline]
 tomoyo_add_entry security/tomoyo/common.c:2042 [inline]
 tomoyo_supervisor+0xaad/0xb20 security/tomoyo/common.c:2103
 tomoyo_audit_path_log security/tomoyo/file.c:168 [inline]
 tomoyo_path_permission security/tomoyo/file.c:587 [inline]
 tomoyo_path_perm+0x261/0x330 security/tomoyo/file.c:838
 tomoyo_path_unlink+0x43/0x60 security/tomoyo/tomoyo.c:150
 security_path_unlink+0x82/0xd0 security/security.c:1101
 do_unlinkat+0x231/0x4d0 fs/namei.c:3893
 __do_sys_unlinkat fs/namei.c:3937 [inline]
 __se_sys_unlinkat fs/namei.c:3930 [inline]
 __x64_sys_unlinkat+0x8e/0xb0 fs/namei.c:3930
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888029a09c9a of 2 bytes by task 8442 on cpu 1:
 tomoyo_domain_quota_is_ok+0xd7/0x2d0 security/tomoyo/util.c:1059
 tomoyo_supervisor+0x1f4/0xb20 security/tomoyo/common.c:2089
 tomoyo_audit_path_log security/tomoyo/file.c:168 [inline]
 tomoyo_path_permission security/tomoyo/file.c:587 [inline]
 tomoyo_path_perm+0x261/0x330 security/tomoyo/file.c:838
 tomoyo_path_unlink+0x43/0x60 security/tomoyo/tomoyo.c:150
 security_path_unlink+0x82/0xd0 security/security.c:1101
 do_unlinkat+0x231/0x4d0 fs/namei.c:3893
 __do_sys_unlinkat fs/namei.c:3937 [inline]
 __se_sys_unlinkat fs/namei.c:3930 [inline]
 __x64_sys_unlinkat+0x8e/0xb0 fs/namei.c:3930
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 8442 Comm: syz-fuzzer Not tainted 5.9.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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