[Bug 12071] Busybox reboot command not working in version 1.29.3

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=12071

--- Comment #5 from Denys Vlasenko <vda.linux at googlemail.com> ---
We are here in this code:

                if (a->action_type & (SYSINIT | WAIT | ONCE | CTRLALTDEL |
SHUTDOWN)) {
                        pid_t pid = run(a);
                        if (a->action_type & (SYSINIT | WAIT | CTRLALTDEL |
SHUTDOWN))
                                waitfor(pid);
                }

inside waitfor(pid), pid is 425:

        /* Wait for any child (prevent zombies from exiting orphaned processes)
         * but exit the loop only when specified one has exited. */
        while (1) {
                pid_t wpid = wait(NULL);
                mark_terminated(wpid);
                /* Unsafe. SIGTSTP handler might have wait'ed it already */
                /*if (wpid == pid) break;*/
                /* More reliable: */
                if (kill(pid, 0))
                        break;
        }

Evidently, you have one of SYSINIT, WAIT, CTRLALTDEL or SHUTDOWN processes
which did not finish. init will wait for SYSINIT processes to finish before
reacting to signals (including shutdown / reboot).

Can you look with "ps" which process is that?

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