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BUG: KCSAN: data-race in exit_mm / mm_update_next_owner

write to 0xffff888107b1b680 of 8 bytes by task 4646 on cpu 1:
 exit_mm+0x9c/0x190 kernel/exit.c:558
 do_exit+0x556/0x1710 kernel/exit.c:861
 do_group_exit+0x102/0x150 kernel/exit.c:1023
 get_signal+0xf2f/0x1080 kernel/signal.c:2909
 arch_do_signal_or_restart+0x95/0x4b0 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x59/0x130 kernel/entry/common.c:218
 do_syscall_64+0xd6/0x1c0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888107b1b680 of 8 bytes by task 4644 on cpu 0:
 mm_update_next_owner+0x1a6/0x410 kernel/exit.c:490
 exit_mm+0xdc/0x190 kernel/exit.c:564
 do_exit+0x556/0x1710 kernel/exit.c:861
 do_group_exit+0x102/0x150 kernel/exit.c:1023
 get_signal+0xf2f/0x1080 kernel/signal.c:2909
 arch_do_signal_or_restart+0x95/0x4b0 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x59/0x130 kernel/entry/common.c:218
 do_syscall_64+0xd6/0x1c0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0xffff888100056f40 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 4644 Comm: syz.2.435 Not tainted 6.10.0-rc6-syzkaller-00051-g1dfe225e9af5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
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