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BUG: KCSAN: data-race in exit_mm / mm_update_next_owner

write to 0xffff88810265c5e0 of 8 bytes by task 8555 on cpu 0:
 exit_mm+0x9b/0x180 kernel/exit.c:560
 do_exit+0x585/0x16d0 kernel/exit.c:858
 do_group_exit+0x101/0x150 kernel/exit.c:1021
 get_signal+0xf4e/0x10a0 kernel/signal.c:2904
 arch_do_signal_or_restart+0x95/0x4b0 arch/x86/kernel/signal.c:309
 exi