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BUG: KCSAN: data-race in avc_policy_seqno / avc_ss_reset

write to 0xffffffff89173c78 of 4 bytes by task 8417 on cpu 0:
 avc_latest_notif_update security/selinux/avc.c:582 [inline]
 avc_ss_reset+0x20c/0x240 security/selinux/avc.c:971
 selinux_notify_policy_change security/selinux/ss/services.c:2231 [inline]
 security_set_bools+0x300/0x340 security/selinux/ss/services.c:3166
 sel_commit_bools_write+0x1e9/0x270 security/selinux/selinuxfs.c:1355
 do_loop_readv_writev fs/read_write.c:852 [inline]
 vfs_writev+0x42b/0x900 fs/read_write.c:1061
 do_writev+0xe9/0x210 fs/read_write.c:1105
 __do_sys_writev fs/read_write.c:1173 [inline]
 __se_sys_writev fs/read_write.c:1170 [inline]
 __x64_sys_writev+0x45/0x50 fs/read_write.c:1170
 x64_sys_call+0x1ba5/0x3000 arch/x86/include/generated/asm/syscalls_64.h:21
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc0/0x2a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff89173c78 of 4 bytes by task 3302 on cpu 1:
 avc_policy_seqno+0x15/0x30 security/selinux/avc.c:1207
 task_avdcache_search security/selinux/hooks.c:3162 [inline]
 selinux_inode_permission+0x3bb/0x7d0 security/selinux/hooks.c:3248
 security_inode_permission+0x69/0xa0 security/security.c:1816
 inode_permission+0x288/0x3b0 fs/namei.c:656
 lookup_inode_permission_may_exec fs/namei.c:688 [inline]
 may_lookup fs/namei.c:1958 [inline]
 link_path_walk+0x779/0xe30 fs/namei.c:2595
 path_lookupat+0x8c/0x500 fs/namei.c:2803
 filename_lookup+0x190/0x390 fs/namei.c:2833
 vfs_statx+0x96/0x170 fs/stat.c:353
 vfs_fstatat+0x118/0x170 fs/stat.c:373
 __do_sys_newfstatat fs/stat.c:538 [inline]
 __se_sys_newfstatat+0x55/0x3e0 fs/stat.c:532
 __x64_sys_newfstatat+0x55/0x70 fs/stat.c:532
 x64_sys_call+0x111f/0x3000 arch/x86/include/generated/asm/syscalls_64.h:263
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xc0/0x2a0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000001 -> 0x00000002

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3302 Comm: udevd Tainted: G        W           syzkaller #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
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