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BUG: KCSAN: data-race in file_remove_privs / new_sync_write

write to 0xffff88807265b6bc of 4 bytes by task 2843 on cpu 1:
 inode_has_no_xattr include/linux/fs.h:3561 [inline]
 file_remove_privs+0x1cf/0x2b0 fs/inode.c:1862
 __generic_file_write_iter+0xd2/0x380 mm/filemap.c:3362
 generic_file_write_iter+0x28c/0x38c mm/filemap.c:3448
 call_write_iter include/linux/fs.h:1901 [inline]
 new_sync_write+0x388/0x4a0 fs/read_write.c:483
 __vfs_write+0xb1/0xc0 fs/read_write.c:496
 vfs_write fs/read_write.c:558 [inline]
 vfs_write+0x18a/0x390 fs/read_write.c:542
 ksys_pwrite64+0xee/0x120 fs/read_write.c:665
 __do_sys_pwrite64 fs/read_write.c:675 [inline]
 __se_sys_pwrite64 fs/read_write.c:672 [inline]
 __x64_sys_pwrite64+0x5e/0x80 fs/read_write.c:672
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88807265b6bc of 4 bytes by task 2812 on cpu 0:
 iocb_flags include/linux/fs.h:3420 [inline]
 init_sync_kiocb include/linux/fs.h:2074 [inline]
 new_sync_write+0x457/0x4a0 fs/read_write.c:479
 __vfs_write+0xb1/0xc0 fs/read_write.c:496
 vfs_write fs/read_write.c:558 [inline]
 vfs_write+0x18a/0x390 fs/read_write.c:542
 ksys_pwrite64+0xee/0x120 fs/read_write.c:665
 __do_sys_pwrite64 fs/read_write.c:675 [inline]
 __se_sys_pwrite64 fs/read_write.c:672 [inline]
 __x64_sys_pwrite64+0x5e/0x80 fs/read_write.c:672
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 2812 Comm: syz-executor.5 Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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