SSHD causes 100% CPU load
Corinna Vinschen
corinna-cygwin@cygwin.com
Fri Aug 6 13:59:01 GMT 2021
On Aug 6 20:14, Takashi Yano via Cygwin wrote:
> On Fri, 6 Aug 2021 11:11:05 +0200
> Corinna Vinschen wrote:
> > On Aug 6 10:55, Takashi Yano via Cygwin wrote:
> > > Hi Corinna,
> > >
> > > On Fri, 6 Aug 2021 01:43:31 +0900
> > > Takashi Yano wrote:
> > > > Hi Corinna,
> > > >
> > > > On Thu, 5 Aug 2021 17:07:24 +0200
> > > > Corinna Vinschen wrote:
> > > > > Could you perhaps bisect the issue on your machine?
> > > >
> > > > In my environment, this does not happen with 8.4p1-1 and 8.4p1-2.
> > > > However it happens with 8.5p1-1.
> > > > [...]
> > > I looked into the openssh code and might find a calprit.
> > > I guess the following patch solves the issue.
> > >
> > > --- serverloop.c.orig 2021-03-02 19:31:47.000000000 +0900
> > > +++ serverloop.c 2021-08-06 10:41:55.439357200 +0900
> > > @@ -333,7 +333,7 @@
> > > return -1;
> > > } else if (len == -1) {
> > > if (errno == EINTR || errno == EAGAIN ||
> > > - errno != EWOULDBLOCK)
> > > + errno == EWOULDBLOCK)
> > > return 0;
> > > verbose("Read error from remote host %s port %d: %s",
> > > ssh_remote_ipaddr(ssh), ssh_remote_port(ssh),
> > >
> > >
> > > This seems to be a upstream bug which has been already fixed.
> > >
> > > Please refer to:
> > > https://github.com/openssh/openssh-portable/commit/2dc328023f60212cd29504fc05d849133ae47355
> >
> > Gosh, looks like I totally missed the 8.6p1 release!
> >
> > I'll build and upload 8.6p1 ASAP.
>
> I have confirmed that the issue has been fixed in 8.6p1-1.
Great, thanks for testing!
Corinna
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