================================================================== BUG: KCSAN: data-race in filemap_map_pages / generic_write_end write to 0xffff88810d7f5ad0 of 8 bytes by task 17845 on cpu 0: i_size_write include/linux/fs.h:870 [inline] generic_write_end+0x99/0x240 fs/buffer.c:2186 ext4_da_write_end+0x59b/0x760 fs/ext4/inode.c:3111 generic_perform_write+0x23e/0x3a0 mm/filemap.c:3423 ext4_buffered_write_iter+0x2e5/0x3e0 fs/ext4/file.c:270 ext4_file_write_iter+0x47a/0x1060 fs/ext4/file.c:503 call_write_iter include/linux/fs.h:1901 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0x6f0/0x7e0 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+0x44/0xa9 read to 0xffff88810d7f5ad0 of 8 bytes by task 17864 on cpu 1: i_size_read include/linux/fs.h:848 [inline] filemap_map_pages+0x481/0x9b0 mm/filemap.c:2960 do_fault_around mm/memory.c:3980 [inline] do_read_fault+0x22f/0x720 mm/memory.c:4014 do_fault mm/memory.c:4147 [inline] handle_pte_fault mm/memory.c:4387 [inline] __handle_mm_fault mm/memory.c:4522 [inline] handle_mm_fault+0x100c/0x1810 mm/memory.c:4620 faultin_page mm/gup.c:851 [inline] __get_user_pages+0xa42/0x1000 mm/gup.c:1070 populate_vma_page_range mm/gup.c:1403 [inline] __mm_populate+0x24d/0x380 mm/gup.c:1451 mm_populate include/linux/mm.h:2591 [inline] vm_mmap_pgoff+0x14c/0x1d0 mm/util.c:524 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: 17864 Comm: syz-executor.0 Not tainted 5.11.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================