================================================================== BUG: KCSAN: data-race in filemap_fault / generic_write_end write to 0xffff888120d012a8 of 8 bytes by task 6785 on cpu 1: 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] do_iter_readv_writev+0x2de/0x380 fs/read_write.c:725 do_iter_write+0x192/0x5c0 fs/read_write.c:851 vfs_iter_write+0x4c/0x70 fs/read_write.c:892 iter_file_splice_write+0x43a/0x790 fs/splice.c:689 do_splice_from fs/splice.c:767 [inline] direct_splice_actor+0x80/0xa0 fs/splice.c:936 splice_direct_to_actor+0x345/0x650 fs/splice.c:891 do_splice_direct+0x106/0x190 fs/splice.c:979 do_sendfile+0x675/0xc40 fs/read_write.c:1245 __do_sys_sendfile64 fs/read_write.c:1310 [inline] __se_sys_sendfile64 fs/read_write.c:1296 [inline] __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1296 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 0xffff888120d012a8 of 8 bytes by task 6786 on cpu 0: i_size_read include/linux/fs.h:885 [inline] filemap_fault+0x722/0x8b0 mm/filemap.c:3184 __do_fault mm/memory.c:3868 [inline] do_cow_fault+0x208/0x4d0 mm/memory.c:4213 do_fault mm/memory.c:4314 [inline] handle_pte_fault mm/memory.c:4570 [inline] __handle_mm_fault mm/memory.c:4705 [inline] handle_mm_fault+0x9b1/0x1590 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: 0x000000000047b5f0 -> 0x000000000047c000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 6786 Comm: syz-executor.2 Tainted: G W 5.17.0-rc3-syzkaller-00329-g42964a18f81c-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================