================================================================== BUG: KCSAN: data-race in _copy_from_iter / _copy_from_iter write to 0xffff88811ef80000 of 4096 bytes by task 30768 on cpu 0: instrument_copy_from_user_before include/linux/instrumented.h:130 [inline] copy_from_user_iter lib/iov_iter.c:54 [inline] iterate_iovec include/linux/iov_iter.h:51 [inline] iterate_and_advance2 include/linux/iov_iter.h:247 [inline] iterate_and_advance include/linux/iov_iter.h:271 [inline] __copy_from_iter lib/iov_iter.c:268 [inline] _copy_from_iter+0x2e7/0xb60 lib/iov_iter.c:279 copy_page_from_iter+0x14f/0x280 lib/iov_iter.c:441 process_vm_rw_pages mm/process_vm_access.c:43 [inline] process_vm_rw_single_vec mm/process_vm_access.c:118 [inline] process_vm_rw_core mm/process_vm_access.c:216 [inline] process_vm_rw+0x5d5/0x8c0 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+0x7a/0x90 mm/process_vm_access.c:299 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x59/0x120 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b write to 0xffff88811ef80000 of 4096 bytes by task 30769 on cpu 1: instrument_copy_from_user_before include/linux/instrumented.h:130 [inline] copy_from_user_iter lib/iov_iter.c:54 [inline] iterate_iovec include/linux/iov_iter.h:51 [inline] iterate_and_advance2 include/linux/iov_iter.h:247 [inline] iterate_and_advance include/linux/iov_iter.h:271 [inline] __copy_from_iter lib/iov_iter.c:268 [inline] _copy_from_iter+0x2e7/0xb60 lib/iov_iter.c:279 copy_page_from_iter+0x14f/0x280 lib/iov_iter.c:441 process_vm_rw_pages mm/process_vm_access.c:43 [inline] process_vm_rw_single_vec mm/process_vm_access.c:118 [inline] process_vm_rw_core mm/process_vm_access.c:216 [inline] process_vm_rw+0x5d5/0x8c0 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+0x7a/0x90 mm/process_vm_access.c:299 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x59/0x120 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 30769 Comm: syz-executor.3 Tainted: G W 6.7.0-syzkaller-12824-g9d64bf433c53 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 ==================================================================