kern.proc.pathname failure while booting from zfs

[Konstantin Belousov]

On Tue, Aug 23, 2016 at 09:27:56AM +0200, Frederic Chardon wrote:
> Le 20 ao??t 2016 22:03, "Frederic Chardon" <chardon.frederic at gmail.com> a
> ??crit :
> >
> > Hi
> >
> > I see a strange interaction between zfs on root and kern.proc.pathname
> > on my laptop. Whenever I try to use gcore it fails with:
> > gcore 1023
> > gcore: kern.proc.pathname failure
> >
> > However, gcore /usr/local/bin/zsh 1023 is working properly.
> >
> > I made some tests booting from usb stick (fresh installworld, no
> > src.conf, no make.conf, GENERIC kernel)
> > What works: having / on ufs and importing a zfs pool later on.
> > What doesn't: having / on zfs, whatever the settings for checksum,
> > compression, or normalization.
> >
> > Both 11-stable and 12-current behave this way. Current from may-june
> > worked properly.
> > adb, chromium and virtualbox as well stopped working at approximately
> > the same time, however I don't know if it is linked ("truss -f adb
> > start-server" shows that garbage is passed to execl after forking).
> >
> > Any idea what's going on? Does anybody else see this?
> >
> > Thanks!
> 
> Nobody else have this problem? I reinstalled the system from scratch and
> still gcore fails with the same error, even in single user mode.

Do you have a property on your root fs which forces it to ignore case in
the file names ?