================================================================== BUG: KCSAN: data-race in filemap_map_pages / shmem_write_end write to 0xffff88810a068c80 of 8 bytes by task 16134 on cpu 0: i_size_write include/linux/fs.h:871 [inline] shmem_write_end+0x62/0x4d0 mm/shmem.c:2544 generic_perform_write+0x23e/0x3a0 mm/filemap.c:3340 __generic_file_write_iter+0x15c/0x330 mm/filemap.c:3458 generic_file_write_iter+0x75/0x130 mm/filemap.c:3490 call_write_iter include/linux/fs.h:1903 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0x6d4/0x7c0 fs/read_write.c:605 ksys_write+0xce/0x180 fs/read_write.c:658 __do_sys_write fs/read_write.c:670 [inline] __se_sys_write fs/read_write.c:667 [inline] __x64_sys_write+0x3e/0x50 fs/read_write.c:667 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88810a068c80 of 8 bytes by task 16138 on cpu 1: i_size_read include/linux/fs.h:849 [inline] filemap_map_pages+0x481/0x9a0 mm/filemap.c:2876 do_fault_around mm/memory.c:3967 [inline] do_read_fault+0x233/0x760 mm/memory.c:4001 do_fault mm/memory.c:4134 [inline] handle_pte_fault mm/memory.c:4374 [inline] __handle_mm_fault mm/memory.c:4509 [inline] handle_mm_fault+0xfeb/0x1770 mm/memory.c:4607 faultin_page mm/gup.c:885 [inline] __get_user_pages+0x8ec/0xe50 mm/gup.c:1097 populate_vma_page_range mm/gup.c:1430 [inline] __mm_populate+0x24d/0x340 mm/gup.c:1478 mm_populate include/linux/mm.h:2590 [inline] vm_mmap_pgoff+0x133/0x170 mm/util.c:512 ksys_mmap_pgoff+0x2a8/0x380 mm/mmap.c:1634 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 16138 Comm: syz-executor.3 Not tainted 5.10.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================