SSHD error child_info_fork

SSHD error child_info_fork

[Tasslehoff Burrfoot]

Hi, I recently noticed a problem with sshd on one of my Windows 10 updated
to the recent 1803 update.
First of all I'm using cygwin x86 updated to the latest packages, during
sshd startup I have no errors in the Windows Event Log using services.msc
or using "cygrunsrv --start sshd", same launching sshd deamon from console.
I have no firewall blocking connections and the ssh client is connecting
from a debian host on lan on the same subnet (no networking issues).

When I try to connect to the cygwin sshd deamon I get this
error: ssh_exchange_identification: read: Connection reset by peer

Launching the sshd deamon all seems to start without problems, but when I
try to connect I get this error:
=====================
$ /usr/sbin/sshd -D
/etc/sshd_config line 102: Deprecated option UsePrivilegeSeparation
Could not load host key: /etc/ssh_host_ed25519_key
      0 [main] sshd 19264 child_info_fork::abort:
C:\cygwin\bin\cygiconv-2.dll: Loaded to different address: parent(0xEE0000)
!= child(0x840000)
=====================

This is the same launching sshd with debug option
=====================
$ /usr/sbin/sshd -Dd
/etc/sshd_config line 102: Deprecated option UsePrivilegeSeparation
debug1: sshd version OpenSSH_7.7, OpenSSL 1.0.2o  27 Mar 2018
debug1: private host key #0: ssh-rsa SHA256:xxx
debug1: private host key #1: ecdsa-sha2-nistp256 SHA256:xxx
debug1: key_load_private: No such file or directory
debug1: key_load_public: No such file or directory
Could not load host key: /etc/ssh_host_ed25519_key
debug1: rexec_argv[0]='/usr/sbin/sshd'
debug1: rexec_argv[1]='-Dd'
debug1: Bind to port 22 on ::.
Server listening on :: port 22.
debug1: Bind to port 22 on 0.0.0.0.
Server listening on 0.0.0.0 port 22.

debug1: fd 5 clearing O_NONBLOCK
debug1: Server will not fork when running in debugging mode.
debug1: rexec start in 5 out 5 newsock 5 pipe -1 sock 8
debug1: inetd sockets after dupping: 3, 3
Connection from 192.168.1.100 port 43677 on 192.168.1.200 port 22
debug1: Client protocol version 2.0; client software version OpenSSH_6.7p1
Debian-5+deb8u4
debug1: match: OpenSSH_6.7p1 Debian-5+deb8u4 pat OpenSSH* compat 0x04000000
debug1: Local version string SSH-2.0-OpenSSH_7.7
      0 [main] sshd 11752 child_info_fork::abort:
C:\cygwin\bin\cygiconv-2.dll: Loaded to different address: parent(0x850000)
!= child(0xED0000)
fork of unprivileged child failed
debug1: do_cleanup
=====================

Do you have any suggestion?

Thanks

Tas

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Re: SSHD error child_info_fork

[Marco Atzeri]

On 5/6/2018 3:35 PM, Tasslehoff Burrfoot wrote:
> Hi, I recently noticed a problem with sshd on one of my Windows 10 updated
> to the recent 1803 update.
> First of all I'm using cygwin x86 updated to the latest packages, during
> sshd startup I have no errors in the Windows Event Log using services.msc
> or using "cygrunsrv --start sshd", same launching sshd deamon from console.
> I have no firewall blocking connections and the ssh client is connecting
> from a debian host on lan on the same subnet (no networking issues).

If you have a 64bit system you should use the x86_64 bit version


> debug1: match: OpenSSH_6.7p1 Debian-5+deb8u4 pat OpenSSH* compat 0x04000000
> debug1: Local version string SSH-2.0-OpenSSH_7.7
>        0 [main] sshd 11752 child_info_fork::abort:
> C:\cygwin\bin\cygiconv-2.dll: Loaded to different address: parent(0x850000)
> != child(0xED0000)
> fork of unprivileged child failed
> debug1: do_cleanup
> =====================
> 
> Do you have any suggestion?
> 
> Thanks
> 
> Tas



as mentioned here
> Problem reports:       http://cygwin.com/problems.html

please provide the cygcheck.out

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