syzbot

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BUG: KCSAN: data-race in file_remove_privs / security_inode_permission

read-write to 0xffff888012f7a6ac of 4 bytes by task 22625 on cpu 0:
 inode_has_no_xattr include/linux/fs.h:3392 [inline]
 file_remove_privs+0x2ce/0x370 fs/inode.c:1942
 file_modified+0x16/0x80 fs/inode.c:2005
 ext4_write_checks fs/ext4/file.c:248 [inline]
 ext4_buffered_write_iter+0x1f9/0x3d0 fs/ext4/file.c:265
 ext4_file_write_iter+0x45e/0x1090 fs/ext4/file.c:503
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x6d4/0x7c0 fs/read_write.c:605
 ksys_write+0xce/0x180 fs/read_write.c:658
 __do_sys_write fs/read_write.c:670 [inline]
 __se_sys_write fs/read_write.c:667 [inline]
 __x64_sys_write+0x3e/0x50 fs/read_write.c:667
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888012f7a6ac of 4 bytes by task 22621 on cpu 1:
 security_inode_permission+0x1c/0xc0 security/security.c:1258
 inode_permission+0xb2/0x320 fs/namei.c:471
 may_open+0x19f/0x2e0 fs/namei.c:2875
 do_open fs/namei.c:3250 [inline]
 path_openat+0x17ac/0x20a0 fs/namei.c:3369
 do_filp_open+0xbd/0x1d0 fs/namei.c:3396
 do_sys_openat2+0xa3/0x240 fs/open.c:1172
 do_sys_open fs/open.c:1188 [inline]
 __do_sys_open fs/open.c:1196 [inline]
 __se_sys_open fs/open.c:1192 [inline]
 __x64_sys_open+0xe2/0x110 fs/open.c:1192
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 22621 Comm: syz-executor.5 Not tainted 5.10.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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