================================================================== BUG: KCSAN: data-race in ext4_setattr / mpage_process_page_bufs write to 0xffff8881289fe1f8 of 8 bytes by task 16028 on cpu 0: i_size_write include/linux/fs.h:888 [inline] ext4_setattr+0xca8/0x15a0 fs/ext4/inode.c:5642 notify_change+0x7e1/0xaa0 fs/attr.c:337 do_truncate+0xfb/0x180 fs/open.c:64 handle_truncate fs/namei.c:2998 [inline] do_last fs/namei.c:3414 [inline] path_openat+0x2f48/0x36e0 fs/namei.c:3525 do_filp_open+0x11e/0x1b0 fs/namei.c:3555 do_sys_open+0x3b3/0x4f0 fs/open.c:1097 ksys_open include/linux/syscalls.h:1385 [inline] __do_sys_creat fs/open.c:1155 [inline] __se_sys_creat fs/open.c:1153 [inline] __x64_sys_creat+0x45/0x60 fs/open.c:1153 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff8881289fe1f8 of 8 bytes by task 16128 on cpu 1: mpage_process_page_bufs+0x40/0x400 fs/ext4/inode.c:2314 mpage_prepare_extent_to_map+0x48b/0x760 fs/ext4/inode.c:2694 ext4_writepages+0xb2b/0x2300 fs/ext4/inode.c:2866 do_writepages+0x6b/0x170 mm/page-writeback.c:2344 __filemap_fdatawrite_range+0x1c5/0x230 mm/filemap.c:421 generic_fadvise+0x4a0/0x4b0 mm/fadvise.c:115 vfs_fadvise+0x92/0xa0 mm/fadvise.c:187 ksys_fadvise64_64+0x61/0xa0 mm/fadvise.c:201 __do_sys_fadvise64 mm/fadvise.c:216 [inline] __se_sys_fadvise64 mm/fadvise.c:214 [inline] __x64_sys_fadvise64+0x5e/0x80 mm/fadvise.c:214 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 16128 Comm: syz-executor.1 Not tainted 5.4.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================