================================================================== BUG: KCSAN: data-race in shmem_add_to_page_cache / shmem_getpage_gfp write to 0xffff88812e577cb0 of 8 bytes by task 23651 on cpu 1: shmem_add_to_page_cache+0x52d/0x650 mm/shmem.c:718 shmem_getpage_gfp+0xbdc/0x1410 mm/shmem.c:1929 shmem_fault+0x16d/0x500 mm/shmem.c:2116 __do_fault mm/memory.c:3678 [inline] do_read_fault mm/memory.c:3980 [inline] do_fault mm/memory.c:4108 [inline] handle_pte_fault mm/memory.c:4367 [inline] __handle_mm_fault mm/memory.c:4502 [inline] handle_mm_fault+0xe8d/0x1a70 mm/memory.c:4600 faultin_page mm/gup.c:908 [inline] __get_user_pages+0x947/0xee0 mm/gup.c:1127 populate_vma_page_range mm/gup.c:1460 [inline] __mm_populate+0x24d/0x380 mm/gup.c:1508 mm_populate include/linux/mm.h:2621 [inline] __do_sys_remap_file_pages+0x3f3/0x590 mm/mmap.c:3042 __se_sys_remap_file_pages mm/mmap.c:2968 [inline] __x64_sys_remap_file_pages+0x63/0x70 mm/mmap.c:2968 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff88812e577cb0 of 8 bytes by task 23640 on cpu 0: shmem_recalc_inode mm/shmem.c:367 [inline] shmem_getpage_gfp+0x1017/0x1410 mm/shmem.c:1939 shmem_fault+0x16d/0x500 mm/shmem.c:2116 __do_fault mm/memory.c:3678 [inline] do_shared_fault mm/memory.c:4034 [inline] do_fault mm/memory.c:4112 [inline] handle_pte_fault mm/memory.c:4367 [inline] __handle_mm_fault mm/memory.c:4502 [inline] handle_mm_fault+0xf76/0x1a70 mm/memory.c:4600 faultin_page mm/gup.c:908 [inline] __get_user_pages+0x947/0xee0 mm/gup.c:1127 __get_user_pages_locked mm/gup.c:1313 [inline] __get_user_pages_remote+0x3f5/0x5b0 mm/gup.c:1765 pin_user_pages_remote+0x58/0x80 mm/gup.c:2833 process_vm_rw_single_vec+0x17d/0x460 mm/process_vm_access.c:105 process_vm_rw_core mm/process_vm_access.c:215 [inline] process_vm_rw+0x347/0x4e0 mm/process_vm_access.c:283 __do_sys_process_vm_writev mm/process_vm_access.c:303 [inline] __se_sys_process_vm_writev mm/process_vm_access.c:298 [inline] __x64_sys_process_vm_writev+0x76/0x90 mm/process_vm_access.c:298 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 23640 Comm: syz-executor.1 Not tainted 5.13.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================