KCSAN: data-race in ext4_writepages / generic_write

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in ext4_writepages / generic_write_end (3) ext4	6				26	1246d	1250d	0/29	closed as invalid on 2022/05/13 11:20
upstream	KCSAN: data-race in ext4_writepages / generic_write_end ext4	6				691	1388d	1911d	0/29	auto-closed as invalid on 2022/01/25 08:29

================================================================== BUG: KCSAN: data-race in ext4_writepages / generic_write_end write to 0xffff888119d152a8 of 8 bytes by task 6362 on cpu 0: 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 0xffff888119d152a8 of 8 bytes by task 6376 on cpu 1: i_size_read include/linux/fs.h:885 [inline] mpage_submit_page fs/ext4/inode.c:2074 [inline] mpage_map_and_submit_buffers fs/ext4/inode.c:2326 [inline] mpage_map_and_submit_extent fs/ext4/inode.c:2465 [inline] ext4_writepages+0x10b6/0x1e80 fs/ext4/inode.c:2778 do_writepages+0x1cb/0x330 mm/page-writeback.c:2364 filemap_fdatawrite_wbc mm/filemap.c:384 [inline] __filemap_fdatawrite_range+0xe1/0x110 mm/filemap.c:417 generic_fadvise+0x1dc/0x430 mm/fadvise.c:113 vfs_fadvise mm/fadvise.c:186 [inline] ksys_fadvise64_64 mm/fadvise.c:200 [inline] __do_sys_fadvise64 mm/fadvise.c:215 [inline] __se_sys_fadvise64 mm/fadvise.c:213 [inline] __x64_sys_fadvise64+0xc5/0x100 mm/fadvise.c:213 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: 0x0000000000a73000 -> 0x0000000000a74000 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 6376 Comm: syz-executor.3 Not tainted 5.17.0-rc2-syzkaller-00064-gc36c04c2e132 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================