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BUG: KCSAN: data-race in kernel_clone / mm_release

write to 0xffff888124f06608 of 8 bytes by task 24551 on cpu 0:
 wait_for_vfork_done kernel/fork.c:1361 [inline]
 kernel_clone+0x35c/0x680 kernel/fork.c:2615
 __do_sys_clone kernel/fork.c:2701 [inline]
 __se_sys_clone kernel/fork.c:2685 [inline]
 __x64_sys_clone+0xc6/0xf0 kernel/fork.c:2685
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888124f06608 of 8 bytes by task 24554 on cpu 1:
 mm_release+0x160/0x210 kernel/fork.c:1412
 exit_mm_release+0x21/0x30 kernel/fork.c:1419
 exit_mm+0x4b/0x3e0 kernel/exit.c:439
 do_exit+0x3ef/0x14a0 kernel/exit.c:812
 do_group_exit+0xce/0x1a0 kernel/exit.c:922
 get_signal+0xf93/0x15d0 kernel/signal.c:2868
 arch_do_signal_or_restart+0x8c/0x280 arch/x86/kernel/signal.c:865
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x109/0x190 kernel/entry/common.c:207
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:300
 do_syscall_64+0x50/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0xffffc90000effe18 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 24554 Comm: syz-executor.4 Not tainted 5.15.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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