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BUG: KCSAN: data-race in ext4_setattr / mpage_submit_page

write to 0xffff888129973aa8 of 8 bytes by task 22015 on cpu 1:
 i_size_write include/linux/fs.h:888 [inline]
 ext4_setattr+0xd48/0x1270 fs/ext4/inode.c:5340
 notify_change+0x82b/0xb00 fs/attr.c:336
 do_truncate+0xfb/0x180 fs/open.c:64
 handle_truncate fs/namei.c:3083 [inline]
 do_last fs/namei.c:3496 [inline]
 path_openat+0x12e0/0x3150 fs/namei.c:3607
 do_filp_open+0x11e/0x1b0 fs/namei.c:3637
 do_sys_openat2+0x4f5/0x620 fs/open.c:1149
 do_sys_open+0xa3/0x110 fs/open.c:1165
 ksys_open include/linux/syscalls.h:1386 [inline]
 __do_sys_creat fs/open.c:1233 [inline]
 __se_sys_creat fs/open.c:1231 [inline]
 __x64_sys_creat+0x45/0x60 fs/open.c:1231
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888129973aa8 of 8 bytes by task 22007 on cpu 0:
 mpage_submit_page+0x81/0x1a0 fs/ext4/inode.c:2068
 mpage_map_and_submit_buffers+0x3c4/0x6c0 fs/ext4/inode.c:2318
 mpage_map_and_submit_extent fs/ext4/inode.c:2457 [inline]
 ext4_writepages+0x1176/0x1d40 fs/ext4/inode.c:2772
 do_writepages+0x6b/0x170 mm/page-writeback.c:2344
 __filemap_fdatawrite_range+0x1c5/0x230 mm/filemap.c:421
 __filemap_fdatawrite mm/filemap.c:429 [inline]
 filemap_flush+0x2d/0x40 mm/filemap.c:456
 ext4_alloc_da_blocks+0x78/0x180 fs/ext4/inode.c:3146
 ext4_release_file+0x10d/0x210 fs/ext4/file.c:142
 __fput+0x1e1/0x520 fs/file_table.c:280
 ____fput+0x1f/0x30 fs/file_table.c:313
 task_work_run+0xf6/0x130 kernel/task_work.c:113
 get_signal+0x12c3/0x1320 kernel/signal.c:2528
 do_signal+0x2f/0x6c0 arch/x86/kernel/signal.c:813
 exit_to_usermode_loop+0x250/0x2c0 arch/x86/entry/common.c:160
 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:278 [inline]
 do_syscall_64+0x384/0x3a0 arch/x86/entry/common.c:304
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 22007 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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