================================================================== BUG: KCSAN: data-race in filemap_fault / generic_write_end write to 0xffff888133d385f8 of 8 bytes by task 12153 on cpu 0: i_size_write include/linux/fs.h:908 [inline] generic_write_end+0x99/0x230 fs/buffer.c:2185 ext4_da_write_end+0x448/0x510 fs/ext4/inode.c:3068 generic_perform_write+0x261/0x400 mm/filemap.c:3806 ext4_buffered_write_iter+0x19d/0x290 fs/ext4/file.c:270 ext4_file_write_iter+0x21a/0xd70 call_write_iter include/linux/fs.h:2081 [inline] new_sync_write fs/read_write.c:504 [inline] vfs_write+0x7de/0x930 fs/read_write.c:591 ksys_write+0xd9/0x190 fs/read_write.c:644 __do_sys_write fs/read_write.c:656 [inline] __se_sys_write fs/read_write.c:653 [inline] __x64_sys_write+0x3e/0x50 fs/read_write.c:653 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff888133d385f8 of 8 bytes by task 12161 on cpu 1: i_size_read include/linux/fs.h:886 [inline] filemap_fault+0x88/0x980 mm/filemap.c:3123 __do_fault mm/memory.c:3860 [inline] do_cow_fault+0x213/0x800 mm/memory.c:4211 do_fault mm/memory.c:4312 [inline] handle_pte_fault mm/memory.c:4568 [inline] __handle_mm_fault mm/memory.c:4704 [inline] handle_mm_fault+0x830/0xca0 mm/memory.c:4802 faultin_page mm/gup.c:878 [inline] __get_user_pages+0x322/0xb70 mm/gup.c:1099 populate_vma_page_range mm/gup.c:1441 [inline] __mm_populate+0x27a/0x390 mm/gup.c:1549 mm_populate include/linux/mm.h:2706 [inline] vm_mmap_pgoff+0x160/0x1f0 mm/util.c:524 ksys_mmap_pgoff+0x265/0x320 mm/mmap.c:1628 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x0000000000ee6000 -> 0x0000000000ee8000 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 12161 Comm: syz-executor.2 Not tainted 5.17.0-syzkaller-09727-g34af78c4e616-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================