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BUG: KCSAN: data-race in avc_policy_seqno / avc_ss_reset

write to 0xffffffff88eb3c28 of 4 bytes by task 14822 on cpu 0:
 avc_latest_notif_update security/selinux/avc.c:581 [inline]
 avc_ss_reset+0x20c/0x240 security/selinux/avc.c:970
 selinux_notify_policy_change security/selinux/ss/services.c:2231 [inline]
 security_set_bools+0x301/0x340 security/selinux/ss/services.c:3166
 sel_commit_bools_write+0x1ea/0x270 security/selinux/selinuxfs.c:1325
 do_loop_readv_writev fs/read_write.c:850 [inline]
 vfs_writev+0x406/0x8b0 fs/read_write.c:1059
 do_writev+0xe7/0x210 fs/read_write.c:1103
 __do_sys_writev fs/read_write.c:1171 [inline]
 __se_sys_writev fs/read_write.c:1168 [inline]
 __x64_sys_writev+0x45/0x50 fs/read_write.c:1168
 x64_sys_call+0x1e9a/0x3000 arch/x86/include/generated/asm/syscalls_64.h:21
 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

read to 0xffffffff88eb3c28 of 4 bytes by task 12967 on cpu 1:
 avc_policy_seqno+0x15/0x30 security/selinux/avc.c:1206
 task_avdcache_search security/selinux/hooks.c:3140 [inline]
 selinux_inode_permission+0x311/0x740 security/selinux/hooks.c:3225
 security_inode_permission+0x6d/0xb0 security/security.c:2363
 inode_permission+0x106/0x310 fs/namei.c:601
 may_lookup fs/namei.c:1858 [inline]
 link_path_walk+0x162/0x900 fs/namei.c:2467
 path_lookupat+0x63/0x2a0 fs/namei.c:2675
 filename_lookup+0x147/0x340 fs/namei.c:2705
 user_path_at+0x3e/0x130 fs/namei.c:3215
 ksys_umount fs/namespace.c:2061 [inline]
 __do_sys_umount fs/namespace.c:2069 [inline]
 __se_sys_umount fs/namespace.c:2067 [inline]
 __x64_sys_umount+0x85/0xe0 fs/namespace.c:2067
 x64_sys_call+0xdd2/0x3000 arch/x86/include/generated/asm/syscalls_64.h:167
 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: 0x00000017 -> 0x00000018

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 12967 Comm: syz-executor 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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