================================================================== BUG: KCSAN: data-race in _copy_from_iter / _copy_from_iter write to 0xffff88814b576000 of 4096 bytes by task 32191 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_ubuf include/linux/iov_iter.h:30 [inline] iterate_and_advance2 include/linux/iov_iter.h:300 [inline] iterate_and_advance include/linux/iov_iter.h:328 [inline] __copy_from_iter lib/iov_iter.c:249 [inline] _copy_from_iter+0x133/0xd00 lib/iov_iter.c:260 copy_page_from_iter+0x14f/0x280 lib/iov_iter.c:422 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+0x5d6/0x8c0 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 x64_sys_call+0x1a4/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:312 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f write to 0xffff88814b576000 of 4096 bytes by task 32193 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_ubuf include/linux/iov_iter.h:30 [inline] iterate_and_advance2 include/linux/iov_iter.h:300 [inline] iterate_and_advance include/linux/iov_iter.h:328 [inline] __copy_from_iter lib/iov_iter.c:249 [inline] _copy_from_iter+0x133/0xd00 lib/iov_iter.c:260 copy_page_from_iter+0x14f/0x280 lib/iov_iter.c:422 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+0x5d6/0x8c0 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 x64_sys_call+0x1a4/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:312 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 32193 Comm: syz.8.10251 Not tainted 6.12.0-rc6-syzkaller-00110-gff7afaeca1a1 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 ==================================================================