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BUG: KCSAN: data-race in do_exit / exit_mm

write to 0xffff88809162b064 of 4 bytes by task 25311 on cpu 1:
 freezer_count include/linux/freezer.h:121 [inline]
 freezable_schedule include/linux/freezer.h:173 [inline]
 exit_mm+0x198/0x330 kernel/exit.c:468
 do_exit+0x415/0x16e0 kernel/exit.c:792
 do_group_exit+0xcb/0x180 kernel/exit.c:903
 get_signal+0xdee/0x1520 kernel/signal.c:2739
 do_signal+0x25/0x270 arch/x86/kernel/signal.c:810
 exit_to_usermode_loop arch/x86/entry/common.c:212 [inline]
 __prepare_exit_to_usermode+0x129/0x230 arch/x86/entry/common.c:246
 __syscall_return_slowpath arch/x86/entry/common.c:329 [inline]
 do_syscall_64+0xb9/0x120 arch/x86/entry/common.c:368
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88809162b064 of 4 bytes by task 25321 on cpu 0:
 find_alive_thread kernel/exit.c:492 [inline]
 find_new_reaper kernel/exit.c:541 [inline]
 forget_original_parent kernel/exit.c:616 [inline]
 exit_notify kernel/exit.c:649 [inline]
 do_exit+0x810/0x16e0 kernel/exit.c:826
 do_group_exit+0xcb/0x180 kernel/exit.c:903
 get_signal+0xdee/0x1520 kernel/signal.c:2739
 do_signal+0x25/0x270 arch/x86/kernel/signal.c:810
 exit_to_usermode_loop arch/x86/entry/common.c:212 [inline]
 __prepare_exit_to_usermode+0x129/0x230 arch/x86/entry/common.c:246
 prepare_exit_to_usermode+0x5/0x20 arch/x86/entry/common.c:277
 idtentry_exit_cond_rcu+0x24/0x80 arch/x86/entry/common.c:649
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:565

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 25321 Comm: syz-executor.4 Not tainted 5.8.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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