================================================================== BUG: KCSAN: data-race in copy_page_from_iter / copy_page_from_iter write to 0xffff888134390000 of 4096 bytes by task 20933 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+0x340/0x590 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+0x3a3/0x540 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+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae write to 0xffff888134390000 of 4096 bytes by task 20931 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+0x340/0x590 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+0x3a3/0x540 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+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 20931 Comm: syz-executor.5 Not tainted 5.12.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================