syzbot

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BUG: KCSAN: data-race in copy_page_from_iter / copy_page_from_iter

write to 0xffff888125edc000 of 4096 bytes by task 2869 on cpu 1:
 instrument_copy_from_user include/linux/instrumented.h:136 [inline]
 copyin lib/iov_iter.c:165 [inline]
 copy_page_from_iter_iovec lib/iov_iter.c:310 [inline]
 copy_page_from_iter+0x279/0x5f0 lib/iov_iter.c:902
 process_vm_rw_pages mm/process_vm_access.c:43 [inline]
 process_vm_rw_single_vec+0x273/0x440 mm/process_vm_access.c:117
 process_vm_rw_core mm/process_vm_access.c:215 [inline]
 process_vm_rw+0x3e1/0x570 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_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

write to 0xffff888125edc000 of 4096 bytes by task 2876 on cpu 0:
 instrument_copy_from_user include/linux/instrumented.h:136 [inline]
 copyin lib/iov_iter.c:165 [inline]
 copy_page_from_iter_iovec lib/iov_iter.c:310 [inline]
 copy_page_from_iter+0x279/0x5f0 lib/iov_iter.c:902
 process_vm_rw_pages mm/process_vm_access.c:43 [inline]
 process_vm_rw_single_vec+0x273/0x440 mm/process_vm_access.c:117
 process_vm_rw_core mm/process_vm_access.c:215 [inline]
 process_vm_rw+0x3e1/0x570 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_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 2876 Comm: syz-executor.3 Not tainted 5.19.0-syzkaller-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
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