================================================================== BUG: KCSAN: data-race in ext4_setattr / mpage_process_page_bufs write to 0xffff88813b32d5d8 of 8 bytes by task 15326 on cpu 1: i_size_write include/linux/fs.h:913 [inline] ext4_setattr+0xd7e/0xf20 fs/ext4/inode.c:5451 notify_change+0x8a3/0xac0 fs/attr.c:410 do_truncate+0xf7/0x140 fs/open.c:64 handle_truncate fs/namei.c:3082 [inline] do_open fs/namei.c:3430 [inline] path_openat+0x191f/0x1eb0 fs/namei.c:3559 do_filp_open+0x105/0x220 fs/namei.c:3586 do_sys_openat2+0xb5/0x2b0 fs/open.c:1212 do_sys_open fs/open.c:1228 [inline] __do_sys_creat fs/open.c:1304 [inline] __se_sys_creat fs/open.c:1298 [inline] __x64_sys_creat+0x62/0x80 fs/open.c:1298 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff88813b32d5d8 of 8 bytes by task 15325 on cpu 0: i_size_read include/linux/fs.h:891 [inline] mpage_process_page_bufs+0x34/0x560 fs/ext4/inode.c:2187 mpage_prepare_extent_to_map+0x4f6/0x650 fs/ext4/inode.c:2621 ext4_writepages+0xa78/0x1e80 fs/ext4/inode.c:2793 do_writepages+0x1cb/0x330 mm/page-writeback.c:2364 filemap_fdatawrite_wbc mm/filemap.c:407 [inline] __filemap_fdatawrite_range mm/filemap.c:440 [inline] __filemap_fdatawrite mm/filemap.c:446 [inline] filemap_flush+0xd7/0x100 mm/filemap.c:473 ext4_alloc_da_blocks+0x47/0x100 fs/ext4/inode.c:3103 ext4_release_file+0x5b/0x1d0 fs/ext4/file.c:141 __fput+0x295/0x520 fs/file_table.c:280 ____fput+0x11/0x20 fs/file_table.c:313 task_work_run+0x8e/0x110 kernel/task_work.c:164 get_signal+0x1506/0x1550 kernel/signal.c:2602 arch_do_signal_or_restart+0x8c/0x2e0 arch/x86/kernel/signal.c:868 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x113/0x190 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:300 do_syscall_64+0x50/0xd0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x00000000004b4000 -> 0x0000000000000000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 15325 Comm: syz-executor.2 Not tainted 5.16.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================