================================================================== BUG: KCSAN: data-race in copy_page_from_iter / copy_page_from_iter write to 0xffff88812cefb000 of 4096 bytes by task 6457 on cpu 0: instrument_copy_from_user include/linux/instrumented.h:136 [inline] copyin lib/iov_iter.c:156 [inline] copy_page_from_iter_iovec lib/iov_iter.c:301 [inline] copy_page_from_iter+0x315/0x560 lib/iov_iter.c:933 process_vm_rw_pages mm/process_vm_access.c:44 [inline] process_vm_rw_single_vec+0x294/0x460 mm/process_vm_access.c:118 process_vm_rw_core mm/process_vm_access.c:216 [inline] process_vm_rw+0x347/0x4e0 mm/process_vm_access.c:284 __do_sys_process_vm_writev mm/process_vm_access.c:304 [inline] __se_sys_process_vm_writev mm/process_vm_access.c:299 [inline] __x64_sys_process_vm_writev+0x76/0x90 mm/process_vm_access.c:299 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae write to 0xffff88812cefb000 of 4096 bytes by task 6443 on cpu 1: instrument_copy_from_user include/linux/instrumented.h:136 [inline] copyin lib/iov_iter.c:156 [inline] copy_page_from_iter_iovec lib/iov_iter.c:301 [inline] copy_page_from_iter+0x315/0x560 lib/iov_iter.c:933 process_vm_rw_pages mm/process_vm_access.c:44 [inline] process_vm_rw_single_vec+0x294/0x460 mm/process_vm_access.c:118 process_vm_rw_core mm/process_vm_access.c:216 [inline] process_vm_rw+0x347/0x4e0 mm/process_vm_access.c:284 __do_sys_process_vm_writev mm/process_vm_access.c:304 [inline] __se_sys_process_vm_writev mm/process_vm_access.c:299 [inline] __x64_sys_process_vm_writev+0x76/0x90 mm/process_vm_access.c:299 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 6443 Comm: syz-executor.4 Not tainted 5.12.0-rc8-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================