syzbot

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BUG: KCSAN: data-race in exit_mm / mm_update_next_owner

write to 0xffff88810e5704e0 of 8 bytes by task 4127 on cpu 0:
 exit_mm+0x9b/0x180 kernel/exit.c:560
 do_exit+0x580/0x1670 kernel/exit.c:861
 do_group_exit+0x101/0x150 kernel/exit.c:1024
 get_signal+0xeb7/0xff0 kernel/signal.c:2881
 arch_do_signal_or_restart+0x89/0x2a0 arch/x86/kernel/signal.c:308
 exit_to_user_mode_loop+0x6f/0xe0 kernel/entry/common.c:168
 exit_to_user_mode_prepare+0x6c/0xb0 kernel/entry/common.c:204
 __syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
 syscall_exit_to_user_mode+0x26/0x140 kernel/entry/common.c:297
 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff88810e5704e0 of 8 bytes by task 4126 on cpu 1:
 mm_update_next_owner+0x1a5/0x410 kernel/exit.c:491
 exit_mm+0xdb/0x180 kernel/exit.c:566
 do_exit+0x580/0x1670 kernel/exit.c:861
 do_group_exit+0x141/0x150 kernel/exit.c:1024
 __do_sys_exit_group kernel/exit.c:1035 [inline]
 __se_sys_exit_group kernel/exit.c:1033 [inline]
 __x64_sys_exit_group+0x1f/0x20 kernel/exit.c:1033
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0xffff888103a76a00 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 4126 Comm: syz-executor.5 Not tainted 6.5.0-rc5-syzkaller-00182-g25aa0bebba72 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
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