From: "Theo de Raadt" <deraadt@openbsd.org>
Subject: Re: mosh aborts with pledge failure after network interruption or SIGSTOP
To: James Cook <falsifian@falsifian.org>
Cc: ports@openbsd.org, Jeremie Courreges-Anglas <jca@wxcvbn.org>
Date: Thu, 10 Sep 2026 11:36:13 -0600

> If I start a mosh session, then bring my network interface down,
> after a few seconds mosh-client dies with this error code:
> 
> 	mosh-client[71399]: pledge "inet", syscall 105
> 	Abort trap

Very new kernels contain:

CVSROOT:        /cvs
Module name:    src
Changes by:     deraadt@cvs.openbsd.org 2026/09/10 01:56:38

Modified files:
        sys/kern       : kern_pledge.c

Log message:
Allow IPPROTO_IP / IP_TOS on AF_INET6 sockets to go through to the
netinet6 code, which will quickly return EINVAL.  Too much software
tries this.  Issue noticed in chrome by kirill
discussions with kirill and robert.