================================================================== BUG: KCSAN: data-race in filemap_fault / generic_write_end write to 0xffff888133a56758 of 8 bytes by task 11345 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+0x448/0x510 fs/ext4/inode.c:3042 generic_perform_write+0x261/0x400 mm/filemap.c:3776 ext4_buffered_write_iter+0x19d/0x290 fs/ext4/file.c:268 ext4_file_write_iter+0x227/0xda0 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 0xffff888133a56758 of 8 bytes by task 11346 on cpu 1: i_size_read include/linux/fs.h:885 [inline] filemap_fault+0x87/0x8b0 mm/filemap.c:3093 __do_fault mm/memory.c:3868 [inline] do_read_fault mm/memory.c:4183 [inline] do_fault mm/memory.c:4312 [inline] handle_pte_fault mm/memory.c:4570 [inline] __handle_mm_fault mm/memory.c:4705 [inline] handle_mm_fault+0xba6/0x1590 mm/memory.c:4803 faultin_page mm/gup.c:969 [inline] __get_user_pages+0x342/0xc10 mm/gup.c:1190 populate_vma_page_range mm/gup.c:1522 [inline] __mm_populate+0x24d/0x370 mm/gup.c:1631 mm_populate include/linux/mm.h:2702 [inline] vm_mmap_pgoff+0x160/0x1f0 mm/util.c:524 ksys_mmap_pgoff+0x265/0x320 mm/mmap.c:1630 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: 0x00000000003bb000 -> 0x00000000003be000 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 11346 Comm: syz-executor.2 Tainted: G W 5.17.0-rc6-syzkaller-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================