================================================================== BUG: KCSAN: data-race in next_uptodate_page / simple_write_end write to 0xffff888109d89050 of 8 bytes by task 24171 on cpu 1: i_size_write include/linux/fs.h:905 [inline] simple_write_end+0x22d/0x410 fs/libfs.c:614 generic_perform_write+0x253/0x3d0 mm/filemap.c:3934 __generic_file_write_iter+0xe6/0x290 mm/filemap.c:4051 generic_file_write_iter+0x7d/0x1c0 mm/filemap.c:4083 call_write_iter include/linux/fs.h:1868 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x463/0x760 fs/read_write.c:584 ksys_write+0xeb/0x1a0 fs/read_write.c:637 __do_sys_write fs/read_write.c:649 [inline] __se_sys_write fs/read_write.c:646 [inline] __x64_sys_write+0x42/0x50 fs/read_write.c:646 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd read to 0xffff888109d89050 of 8 bytes by task 24163 on cpu 0: i_size_read include/linux/fs.h:883 [inline] next_uptodate_page+0x47b/0x560 mm/filemap.c:3454 first_map_page mm/filemap.c:3471 [inline] filemap_map_pages+0x100/0x860 mm/filemap.c:3498 do_fault_around mm/memory.c:4493 [inline] do_read_fault mm/memory.c:4525 [inline] do_fault mm/memory.c:4659 [inline] do_pte_missing mm/memory.c:3647 [inline] handle_pte_fault mm/memory.c:4947 [inline] __handle_mm_fault mm/memory.c:5089 [inline] handle_mm_fault+0x1120/0x2c60 mm/memory.c:5243 faultin_page mm/gup.c:925 [inline] __get_user_pages+0x363/0xc30 mm/gup.c:1147 populate_vma_page_range mm/gup.c:1543 [inline] __mm_populate+0x23d/0x370 mm/gup.c:1652 mm_populate include/linux/mm.h:3153 [inline] vm_mmap_pgoff+0x1a3/0x240 mm/util.c:548 ksys_mmap_pgoff+0x2ac/0x320 mm/mmap.c:1440 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd value changed: 0x0000000000efd000 -> 0x0000000000efe000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 24163 Comm: syz-executor.4 Not tainted 6.3.0-syzkaller-12999-gfa31fc82fb77 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/14/2023 ==================================================================