================================================================== BUG: KCSAN: data-race in copy_mm / percpu_counter_destroy_many write to 0xffff88810994f148 of 8 bytes by task 3580 on cpu 1: __list_del include/linux/list.h:195 [inline] __list_del_entry include/linux/list.h:218 [inline] list_del include/linux/list.h:229 [inline] percpu_counter_destroy_many+0xc7/0x2b0 lib/percpu_counter.c:244 __mmdrop+0x22e/0x350 kernel/fork.c:688 mmdrop include/linux/sched/mm.h:55 [inline] mmdrop_sched include/linux/sched/mm.h:83 [inline] mmdrop_lazy_tlb_sched include/linux/sched/mm.h:110 [inline] finish_task_switch+0x187/0x2b0 kernel/sched/core.c:5289 context_switch kernel/sched/core.c:5399 [inline] __schedule+0x6a8/0xb30 kernel/sched/core.c:6785 __schedule_loop kernel/sched/core.c:6863 [inline] schedule+0x5f/0xd0 kernel/sched/core.c:6878 exit_to_user_mode_loop+0x51/0x100 kernel/entry/common.c:102 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline] do_syscall_64+0x1d6/0x200 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f read to 0xffff88810994ed40 of 1408 bytes by task 3571 on cpu 0: dup_mm kernel/fork.c:1471 [inline] copy_mm+0xe2/0x370 kernel/fork.c:1529 copy_process+0xcf1/0x1fe0 kernel/fork.c:2169 kernel_clone+0x16c/0x5b0 kernel/fork.c:2599 __do_sys_clone kernel/fork.c:2742 [inline] __se_sys_clone kernel/fork.c:2726 [inline] __x64_sys_clone+0xe6/0x120 kernel/fork.c:2726 x64_sys_call+0x2c59/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:57 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 3571 Comm: dhcpcd-run-hook Not tainted 6.16.0-rc2-syzkaller-00045-g4663747812d1 #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 ==================================================================