================================================================== BUG: KCSAN: data-race in generic_write_end / mpage_process_page_bufs write to 0xffff88811dc64618 of 8 bytes by task 6802 on cpu 1: i_size_write include/linux/fs.h:907 [inline] generic_write_end+0x96/0x180 fs/buffer.c:2187 ext4_da_write_end+0x4de/0x630 fs/ext4/inode.c:3042 generic_perform_write+0x261/0x400 mm/filemap.c:3776 ext4_buffered_write_iter+0x244/0x360 fs/ext4/file.c:268 ext4_file_write_iter+0x2e7/0x11f0 call_write_iter include/linux/fs.h:2074 [inline] new_sync_write fs/read_write.c:503 [inline] vfs_write+0x7f5/0x950 fs/read_write.c:590 ksys_write+0xd9/0x190 fs/read_write.c:643 __do_sys_write fs/read_write.c:655 [inline] __se_sys_write fs/read_write.c:652 [inline] __x64_sys_write+0x3e/0x50 fs/read_write.c:652 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 0xffff88811dc64618 of 8 bytes by task 6804 on cpu 0: i_size_read include/linux/fs.h:885 [inline] mpage_process_page_bufs+0x34/0x560 fs/ext4/inode.c:2172 mpage_prepare_extent_to_map+0x4f6/0x650 fs/ext4/inode.c:2604 ext4_writepages+0xa78/0x1e80 fs/ext4/inode.c:2776 do_writepages+0x1cb/0x330 mm/page-writeback.c:2364 filemap_fdatawrite_wbc mm/filemap.c:384 [inline] __filemap_fdatawrite_range mm/filemap.c:417 [inline] filemap_write_and_wait_range+0x1b4/0x340 mm/filemap.c:669 filemap_write_and_wait include/linux/fs.h:2794 [inline] ext4_bmap+0x124/0x230 fs/ext4/inode.c:3122 bmap+0x5c/0x80 fs/inode.c:1795 ioctl_fibmap fs/ioctl.c:77 [inline] file_ioctl fs/ioctl.c:331 [inline] do_vfs_ioctl+0x1330/0x14a0 fs/ioctl.c:853 __do_sys_ioctl fs/ioctl.c:872 [inline] __se_sys_ioctl+0x83/0x140 fs/ioctl.c:860 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:860 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 value changed: 0x0000000000288000 -> 0x000000000028b000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 6804 Comm: syz-executor.1 Not tainted 5.17.0-rc2-syzkaller-00054-g27bb0b18c208 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================