[oe] [OE-core] [PATCH] telnetd:Fix deadlock on cleanup

[Khem Raj]

On Wed, May 30, 2018 at 10:49 PM, Seiichi Ishitsuka
<ishitsuka.sc at ncos.nec.co.jp> wrote:
>> Please check will latest master, if you can reporduce the issue with master then we can revive this discussion on the patch.
>
> I was able to reproduce this issue on qemux86 with the latest version.
>
> Build Configuration:
> BB_VERSION           = "1.37.0"
> BUILD_SYS            = "x86_64-linux"
> NATIVELSBSTRING      = "universal"
> TARGET_SYS           = "i586-poky-linux"
> MACHINE              = "qemux86"
> DISTRO               = "poky"
> DISTRO_VERSION       = "2.5"
> TUNE_FEATURES        = "m32 i586"
> TARGET_FPU           = ""
> meta
> meta-poky
> meta-yocto-bsp       = "master:719d068bde55ef29a3468bc0779d4cb0c11e8c1d"
> meta-oe
> meta-python
> meta-networking      = "master:bb57bac845f3cd1634862fa9868bc8e294ba74a9"
>

OK Please revive/refresh the patch and send out to ml for discussion

> How to reproduce:
>
> 1. telnet from host(192.168.7.1) to qemux86(192.168.7.2)
>
> $ cat ./telnetd.sh
>  #!/bin/sh
>
>  HOST="192.168.7.2"
>  USER="root"
>
>  while :
>  do
>    expect -c "
>    set timeout 10
>    spawn telnet $HOST
>    expect login:\  ; send \"$USER\r\"
>    expect \"# \" ; send \"exit\r\"
>  "> /dev/null
>  done
>
> $ ./telnetd.sh &
> $ ./telnetd.sh &
>
> 2. Check process status on qemux86
>
> root       325     1  0 04:41 ?        00:00:01 /usr/sbin/xinetd -pidfile /var/r
> root      3328   325  0 04:43 ?        00:00:00 in.telnetd: 192.168.7.1
> root      3330  3328  0 04:43 ?        00:00:00 [sh] <defunct>
> root      3374   325  0 04:43 ?        00:00:00 in.telnetd: 192.168.7.1
> root      3376  3374  0 04:43 ?        00:00:00 [sh] <defunct>
> root      3417   306  0 04:44 ttyS0    00:00:00 ps -ef
>
> -> Found defunct sh and in.telnetd(waiting futex).
>
> root at qemux86:~# strace -p 3328
> strace: Process 3328 attached
> futex(0x45055a18, FUTEX_WAIT_PRIVATE, 2, NULL^Cstrace: Process 3328 detached
>  <detached ...>
>
> root at qemux86:~# strace -p 3374
> strace: Process 3374 attached
> futex(0x45055a18, FUTEX_WAIT_PRIVATE, 2, NULL^Cstrace: Process 3374 detached
>  <detached ...>
>
> Best regards,
> Seiichi Ishitsuka
> --
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