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BUG: KCSAN: data-race in freeze_processes / freezing_slow_path

write to 0xffffffff8454f80d of 1 bytes by task 3698 on cpu 0:
 freeze_processes+0xad/0x180 kernel/power/process.c:139
 suspend_freeze_processes kernel/power/power.h:253 [inline]
 suspend_prepare+0x9a/0x2c0 kernel/power/suspend.c:359
 enter_state+0x1fd/0x530 kernel/power/suspend.c:576
 pm_suspend+0x4b/0x130 kernel/power/suspend.c:613
 state_store+0x1f2/0x210 kernel/power/main.c:658
 kobj_attr_store+0x40/0x60 lib/kobject.c:856
 sysfs_kf_write+0xa6/0xc0 fs/sysfs/file.c:139
 kernfs_fop_write_iter+0x1d3/0x2d0 fs/kernfs/file.c:296
 call_write_iter include/linux/fs.h:2114 [inline]
 do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:740
 do_iter_write+0x112/0x4c0 fs/read_write.c:866
 vfs_iter_write+0x4c/0x70 fs/read_write.c:907
 iter_file_splice_write+0x40a/0x750 fs/splice.c:689
 do_splice_from fs/splice.c:767 [inline]
 direct_splice_actor+0x80/0xa0 fs/splice.c:936
 splice_direct_to_actor+0x345/0x650 fs/splice.c:891
 do_splice_direct+0xf5/0x170 fs/splice.c:979
 do_sendfile+0x773/0xda0 fs/read_write.c:1260
 __do_sys_sendfile64 fs/read_write.c:1319 [inline]
 __se_sys_sendfile64 fs/read_write.c:1311 [inline]
 __x64_sys_sendfile64+0xa9/0x130 fs/read_write.c:1311
 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffffffff8454f80d of 1 bytes by task 15482 on cpu 1:
 freezing_slow_path+0xb4/0x110 kernel/freezer.c:48
 freezing include/linux/freezer.h:39 [inline]
 try_to_freeze_unsafe include/linux/freezer.h:58 [inline]
 try_to_freeze include/linux/freezer.h:67 [inline]
 get_signal+0x15a5/0x1610 kernel/signal.c:2630
 arch_do_signal_or_restart+0x2a/0x220 arch/x86/kernel/signal.c:789
 handle_signal_work kernel/entry/common.c:147 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
 exit_to_user_mode_prepare+0x109/0x190 kernel/entry/common.c:208
 irqentry_exit_to_user_mode+0x5/0x20 kernel/entry/common.c:314
 irqentry_exit+0xe/0x30 kernel/entry/common.c:405
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:577

value changed: 0x00 -> 0x01

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 15482 Comm: syz-executor.3 Not tainted 5.13.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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