================================================================== BUG: KCSAN: data-race in generic_write_end / next_uptodate_page write to 0xffff88813190d670 of 8 bytes by task 15869 on cpu 0: i_size_write include/linux/fs.h:872 [inline] generic_write_end+0x99/0x240 fs/buffer.c:2187 ext4_da_write_end+0x59b/0x760 fs/ext4/inode.c:3112 generic_perform_write+0x23e/0x3a0 mm/filemap.c:3586 ext4_buffered_write_iter+0x2e5/0x3e0 fs/ext4/file.c:269 ext4_file_write_iter+0x48a/0x10b0 fs/ext4/file.c:502 call_write_iter include/linux/fs.h:1977 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0x6f9/0x7e0 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+0x44/0xae read to 0xffff88813190d670 of 8 bytes by task 15872 on cpu 1: i_size_read include/linux/fs.h:850 [inline] next_uptodate_page+0x373/0x780 mm/filemap.c:3061 next_map_page mm/filemap.c:3086 [inline] filemap_map_pages+0x5dc/0x770 mm/filemap.c:3142 do_fault_around mm/memory.c:3920 [inline] do_read_fault+0x217/0x530 mm/memory.c:3934 do_fault mm/memory.c:4067 [inline] handle_pte_fault mm/memory.c:4318 [inline] __handle_mm_fault mm/memory.c:4453 [inline] handle_mm_fault+0x1019/0x1840 mm/memory.c:4551 faultin_page mm/gup.c:850 [inline] __get_user_pages+0xa47/0x1000 mm/gup.c:1069 populate_vma_page_range mm/gup.c:1402 [inline] __mm_populate+0x24d/0x380 mm/gup.c:1450 mm_populate include/linux/mm.h:2570 [inline] vm_mmap_pgoff+0x14c/0x1d0 mm/util.c:524 ksys_mmap_pgoff+0x2a8/0x380 mm/mmap.c:1632 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 15872 Comm: syz-executor.3 Not tainted 5.12.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================