==================================================================
BUG: KCSAN: data-race in avc_policy_seqno / avc_ss_reset

write to 0xffffffff8961e8e0 of 4 bytes by task 32629 on cpu 1:
 avc_latest_notif_update security/selinux/avc.c:581 [inline]
 avc_ss_reset+0x209/0x240 security/selinux/avc.c:970
 selinux_notify_policy_change security/selinux/ss/services.c:2234 [inline]
 security_set_bools+0x311/0x350 security/selinux/ss/services.c:3044
 sel_commit_bools_write+0x1e9/0x270 security/selinux/selinuxfs.c:1220
 do_loop_readv_writev fs/read_write.c:851 [inline]
 vfs_writev+0x420/0x8c0 fs/read_write.c:1060
 do_writev+0xe9/0x210 fs/read_write.c:1104
 __do_sys_writev fs/read_write.c:1172 [inline]
 __se_sys_writev fs/read_write.c:1169 [inline]
 __x64_sys_writev+0x45/0x50 fs/read_write.c:1169
 x64_sys_call+0x23c9/0x2550 arch/x86/include/generated/asm/syscalls_64.h:21
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff8961e8e0 of 4 bytes by task 2982 on cpu 0:
 avc_policy_seqno+0x15/0x30 security/selinux/avc.c:1209
 task_avdcache_search security/selinux/hooks.c:3196 [inline]
 selinux_inode_permission+0x3af/0x740 security/selinux/hooks.c:3278
 security_inode_permission+0x69/0xa0 security/security.c:1842
 inode_permission+0x1da/0x3b0 fs/namei.c:661
 lookup_inode_permission_may_exec fs/namei.c:-1 [inline]
 may_lookup fs/namei.c:1961 [inline]
 link_path_walk+0x875/0xdd0 fs/namei.c:2604
 path_lookupat+0x53/0x4c0 fs/namei.c:2812
 filename_lookup+0x18f/0x390 fs/namei.c:2842
 do_readlinkat+0x74/0x2f0 fs/stat.c:571
 __do_sys_readlink fs/stat.c:605 [inline]
 __se_sys_readlink fs/stat.c:602 [inline]
 __x64_sys_readlink+0x47/0x60 fs/stat.c:602
 x64_sys_call+0x1d41/0x2550 arch/x86/include/generated/asm/syscalls_64.h:90
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x112/0x360 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000003 -> 0x00000004

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 2982 Comm: udevd Not tainted syzkaller #0 PREEMPT(lazy) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
==================================================================