loop4: detected capacity change from 0 to 16 ================================================================== BUG: KCSAN: data-race in next_uptodate_page / truncate_setsize write to 0xffff888134ff5198 of 8 bytes by task 13633 on cpu 1: i_size_write include/linux/fs.h:913 [inline] truncate_setsize+0x2a/0xc0 mm/truncate.c:772 fat_setattr+0x69a/0x7d0 fs/fat/file.c:538 notify_change+0x8a3/0xac0 fs/attr.c:410 do_truncate+0xf7/0x140 fs/open.c:64 handle_truncate fs/namei.c:3082 [inline] do_open fs/namei.c:3430 [inline] path_openat+0x191f/0x1eb0 fs/namei.c:3559 do_filp_open+0x105/0x220 fs/namei.c:3586 do_sys_openat2+0xb5/0x2b0 fs/open.c:1212 do_sys_open fs/open.c:1228 [inline] __do_sys_creat fs/open.c:1304 [inline] __se_sys_creat fs/open.c:1298 [inline] __x64_sys_creat+0x62/0x80 fs/open.c:1298 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 0xffff888134ff5198 of 8 bytes by task 13521 on cpu 0: i_size_read include/linux/fs.h:891 [inline] next_uptodate_page+0x334/0x630 mm/filemap.c:3262 next_map_page mm/filemap.c:3287 [inline] filemap_map_pages+0x531/0x5f0 mm/filemap.c:3343 do_fault_around mm/memory.c:4143 [inline] do_read_fault mm/memory.c:4158 [inline] do_fault mm/memory.c:4293 [inline] handle_pte_fault mm/memory.c:4551 [inline] __handle_mm_fault mm/memory.c:4686 [inline] handle_mm_fault+0xaf7/0x1590 mm/memory.c:4784 faultin_page mm/gup.c:939 [inline] __get_user_pages+0x388/0xc80 mm/gup.c:1160 populate_vma_page_range mm/gup.c:1492 [inline] __mm_populate+0x24d/0x370 mm/gup.c:1601 mm_populate include/linux/mm.h:2734 [inline] vm_mmap_pgoff+0x160/0x1f0 mm/util.c:524 ksys_mmap_pgoff+0x265/0x320 mm/mmap.c:1623 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: 0x000000000000f000 -> 0x0000000000000000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 13521 Comm: syz-executor.4 Not tainted 5.16.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================