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BUG: KCSAN: data-race in avc_policy_seqno / avc_ss_reset

write to 0xffffffff89601260 of 4 bytes by task 22391 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:1356
 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+0x1c0c/0x3020 arch/x86/include/generated/asm/syscalls_64.h:21
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff89601260 of 4 bytes by task 16930 on cpu 1:
 avc_policy_seqno+0x15/0x30 security/selinux/avc.c:1207
 task_avdcache_search security/selinux/hooks.c:3186 [inline]
 selinux_inode_permission+0x3bb/0x7d0 security/selinux/hooks.c:3272
 security_inode_permission+0x69/0xa0 security/security.c:1842
 inode_permission+0x288/0x3b0 fs/namei.c:656
 lookup_inode_permission_may_exec fs/namei.c:691 [inline]
 may_lookup fs/namei.c:1957 [inline]
 link_path_walk+0x899/0xe30 fs/namei.c:2600
 path_lookupat+0x8c/0x500 fs/namei.c:2808
 filename_lookup+0x190/0x390 fs/namei.c:2838
 user_path_at+0x3e/0x100 fs/namei.c:3643
 ksys_umount fs/namespace.c:2062 [inline]
 __do_sys_umount fs/namespace.c:2070 [inline]
 __se_sys_umount fs/namespace.c:2068 [inline]
 __x64_sys_umount+0x85/0xe0 fs/namespace.c:2068
 x64_sys_call+0x103b/0x3020 arch/x86/include/generated/asm/syscalls_64.h:167
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000007 -> 0x00000008

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 16930 Comm: syz-executor Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
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EXT4-fs (loop9): unmounting filesystem 00000000-0000-0000-0000-000000000000.