================================================================== BUG: KCSAN: data-race in ext4_setattr / mpage_process_page_bufs write to 0xffff8881049e3798 of 8 bytes by task 1905 on cpu 1: i_size_write include/linux/fs.h:916 [inline] ext4_setattr+0xd7f/0xef0 fs/ext4/inode.c:5440 notify_change+0x8a3/0xac0 fs/attr.c:410 do_truncate+0xf7/0x140 fs/open.c:64 handle_truncate fs/namei.c:3084 [inline] do_open fs/namei.c:3432 [inline] path_openat+0x1925/0x1ec0 fs/namei.c:3561 do_filp_open+0x105/0x220 fs/namei.c:3588 do_sys_openat2+0xb5/0x2b0 fs/open.c:1200 do_sys_open fs/open.c:1216 [inline] __do_sys_creat fs/open.c:1290 [inline] __se_sys_creat fs/open.c:1284 [inline] __x64_sys_creat+0x62/0x80 fs/open.c:1284 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff8881049e3798 of 8 bytes by task 1880 on cpu 0: i_size_read include/linux/fs.h:894 [inline] mpage_process_page_bufs+0x34/0x560 fs/ext4/inode.c:2190 mpage_prepare_extent_to_map+0x4f6/0x650 fs/ext4/inode.c:2624 ext4_writepages+0xa18/0x1d70 fs/ext4/inode.c:2796 do_writepages+0x26b/0x3c0 mm/page-writeback.c:2364 filemap_fdatawrite_wbc mm/filemap.c:400 [inline] __filemap_fdatawrite_range mm/filemap.c:433 [inline] file_write_and_wait_range+0x1ae/0x240 mm/filemap.c:810 ext4_sync_file+0x105/0x670 fs/ext4/fsync.c:151 vfs_fsync_range+0x107/0x120 fs/sync.c:200 generic_write_sync include/linux/fs.h:2955 [inline] ext4_buffered_write_iter+0x3af/0x400 fs/ext4/file.c:277 ext4_file_write_iter+0x2e7/0x11f0 call_write_iter include/linux/fs.h:2163 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x7bc/0x900 fs/read_write.c:594 ksys_write+0xd9/0x190 fs/read_write.c:647 __do_sys_write fs/read_write.c:659 [inline] __se_sys_write fs/read_write.c:656 [inline] __x64_sys_write+0x3e/0x50 fs/read_write.c:656 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x0000000000de1000 -> 0x0000000000000000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 1880 Comm: syz-executor.5 Tainted: G W 5.15.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================