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BUG: KCSAN: data-race in avc_policy_seqno / avc_ss_reset

write to 0xffffffff88e81cd8 of 4 bytes by task 20180 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+0x301/0x340 security/selinux/ss/services.c:3166
 sel_commit_bools_write+0x1ea/0x270 security/selinux/selinuxfs.c:1333
 do_loop_readv_writev fs/read_write.c:850 [inline]
 vfs_writev+0x403/0x8b0 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/0x2ff0 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 0xffffffff88e81cd8 of 4 bytes by task 20183 on cpu 1:
 avc_policy_seqno+0x15/0x30 security/selinux/avc.c:1207
 task_avdcache_search security/selinux/hooks.c:3136 [inline]
 selinux_inode_permission+0x311/0x740 security/selinux/hooks.c:3221
 security_inode_permission+0x6d/0xb0 security/security.c:2324
 inode_permission+0x106/0x310 fs/namei.c:601
 may_lookup fs/namei.c:1836 [inline]
 link_path_walk+0x162/0x900 fs/namei.c:2445
 path_parentat fs/namei.c:2701 [inline]
 __filename_parentat+0x15c/0x3f0 fs/namei.c:2725
 filename_parentat fs/namei.c:2743 [inline]
 filename_create+0x78/0x230 fs/namei.c:4120
 do_symlinkat+0x65/0x3c0 fs/namei.c:4749
 __do_sys_symlinkat fs/namei.c:4772 [inline]
 __se_sys_symlinkat fs/namei.c:4769 [inline]
 __x64_sys_symlinkat+0x5a/0x70 fs/namei.c:4769
 x64_sys_call+0x293d/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:267
 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: 0x000000fd -> 0x000000fe

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 20183 Comm: syz-executor Tainted: G        W           6.17.0-rc1-syzkaller-00016-g8742b2d8935f #0 PREEMPT(voluntary) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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