svn commit: r344157 - stable/12/lib/libc/x86/sys

[Herbert J. Skuhra]

On Mon, Feb 18, 2019 at 04:03:05PM +0200, Konstantin Belousov wrote:
> On Mon, Feb 18, 2019 at 12:37:45PM +0100, Herbert J. Skuhra wrote:
> > On Mon, Feb 18, 2019 at 09:58:14AM +0200, Konstantin Belousov wrote:
> > > On Sun, Feb 17, 2019 at 11:22:48PM +0100, Herbert J. Skuhra wrote:
> > > > On Sun, 17 Feb 2019 22:19:16 +0100, Konstantin Belousov wrote:
> > > > > 
> > > > > On Sun, Feb 17, 2019 at 10:07:09PM +0100, Herbert J. Skuhra wrote:
> > > > > > On Fri, 15 Feb 2019 12:33:48 +0100, Konstantin Belousov wrote:
> > > > > > > 
> > > > > > > Author: kib
> > > > > > > Date: Fri Feb 15 11:33:48 2019
> > > > > > > New Revision: 344157
> > > > > > > URL: https://svnweb.freebsd.org/changeset/base/344157
> > > > > > > 
> > > > > > > Log:
> > > > > > >   MFC r343855, r343859:
> > > > > > >   Use ifunc to select the barrier instruction for RDTSC.
> > > > > > > 
> > > > > > > Modified:
> > > > > > >   stable/12/lib/libc/x86/sys/__vdso_gettc.c
> > > > > > > Directory Properties:
> > > > > > >   stable/12/   (props changed)
> > > > > > 
> > > > > > After upgrading my Soekris Net 6501-70 (amd64) to this revision the
> > > > > > system is unusable. Basically all programs produce a "Segmentation
> > > > > > fault (core dumped)":
> > > > > > 
> > > > > > pid 856 (ls), jid 0, uid 1001: exited on signal 11 (core dumped)
> > > > > > pid 857 (ls), jid 0, uid 1001: exited on signal 11 (core dumped)
> > > > > > pid 858 (bsdtar), jid 0, uid 0: exited on signal 11 (core dumped)
> > > > > > pid 859 (sh), jid 0, uid 0: exited on signal 11 (core dumped)
> > > > > > pid 876 (dmesg), jid 0, uid 1001: exited on signal 11 (core dumped)
> > > > > > pid 877 (su), jid 0, uid 0: exited on signal 11
> > > > > > pid 880 (more), jid 0, uid 1001: exited on signal 11 (core dumped)
> > > > > > pid 885 (sudo), jid 0, uid 0: exited on signal 11
> > > > > 
> > > > > What do you have in your make.conf and src.conf ?
> > > > 
> > > > I am building on a faster machine with a Intel(R) Xeon(R) CPU.
> > > > 
> > > > /etc/src.conf:
> > > > 
> > > > WITHOUT_DEBUG_FILES=
> > > > WITHOUT_KERNEL_SYMBOLS=
> > > > WITHOUT_PROFILE=
> > > > WITH_KERNEL_RETPOLINE=
> > > 
> > > > WITH_RETPOLINE=
> > > ^^^^^^
> > > Remove this setting and rebuild the world.
> > > Is it still broken ?
> > 
> > No, without the line "WITH_RETPOLINE=" the system is OK.
> 
> Which version of clang do you get ?  It was recently bumped from 6.0.1
> to 7.0.1, and there was a ifunc use in libc in quite fundamental place
> already.

Build machine is still on stable/12 r343834 (clang 6.0.1).
Problem starts with r344157 (also clang 6.0.1). Now the affected machine
runs r344247 (clang 7.0.1).

-- 
Herbert