[Bug 13116] New: deadlock in ash

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=13116

            Bug ID: 13116
           Summary: deadlock in ash
           Product: Busybox
           Version: 1.32.x
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Other
          Assignee: unassigned at busybox.net
          Reporter: ncopa at alpinelinux.org
                CC: busybox-cvs at busybox.net
  Target Milestone: ---

The testsuite for stunnel-5.56 deadlocks after busybox upgrade from
1.32.1->1.32.0.

I have bisected it to this commmit:

commit 47eb979404735b9528538968cb5eaac7355a0c5a (HEAD, refs/bisect/bad)
Author: Denys Vlasenko <vda.linux at googlemail.com>
Date:   Tue Feb 18 15:37:43 2020 +0100

    ash: jobs: Only clear gotsigchld when waiting for everything

I have also confirmed that reverting that commit solves the deadlock.

To reproduce:

* fetch https://www.stunnel.org/downloads/archive/5.x/stunnel-5.56.tar.gz
* build it from source.
* run make check with busybox ash (/bin/sh can be edited in tests/make_test)

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