syzbot

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BUG: KCSAN: data-race in exit_mm / mm_update_next_owner

write to 0xffff88810dba0de0 of 8 bytes by task 3783 on cpu 0:
 exit_mm+0x98/0x170 kernel/exit.c:509
 do_exit+0x541/0x1740 kernel/exit.c:807
 do_group_exit+0xfe/0x140 kernel/exit.c:950
 get_signal+0xb40/0xc60 kernel/signal.c:2858
 arch_do_signal_or_restart+0x87/0x2d0 arch/x86/kernel/signal.c:869
 exit_to_user_mode_loop+0x78/0x130 kernel/entry/common.c:168
 exit_to_user_mode_prepare kernel/entry/common.c:203 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]
 syscall_exit_to_user_mode+0x6a/0x90 kernel/entry/common.c:296
 do_syscall_64+0x37/0x70 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff88810dba0de0 of 8 bytes by task 3782 on cpu 1:
 mm_update_next_owner+0x22c/0x4e0 kernel/exit.c:440
 exit_mm+0xd3/0x170 kernel/exit.c:515
 do_exit+0x541/0x1740 kernel/exit.c:807
 do_group_exit+0x13e/0x140 kernel/exit.c:950
 __do_sys_exit_group kernel/exit.c:961 [inline]
 __se_sys_exit_group kernel/exit.c:959 [inline]
 __x64_sys_exit_group+0x1b/0x20 kernel/exit.c:959
 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

value changed: 0xffff888106e01400 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3782 Comm: syz-executor.3 Not tainted 6.1.0-rc5-syzkaller-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
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