Date: Wed, 14 Jun 2023 09:01:35 +0000 From: Gary Jennejohn <garyj@gmx.de> To: Alexander Chernikov <melifaro@FreeBSD.org> Cc: current@freebsd.org Subject: Re: ifconfig dumps core and gdb uses an undefined symbol Message-ID: <20230614110135.15b928db@ernst.home> In-Reply-To: <7A98AD66-35D3-447B-B808-2A52E9AD28F3@FreeBSD.org> References: <20230614095956.26234554@ernst.home> <7A98AD66-35D3-447B-B808-2A52E9AD28F3@FreeBSD.org>
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On Wed, 14 Jun 2023 09:09:04 +0100
Alexander Chernikov <melifaro@FreeBSD.org> wrote:
> > On 14 Jun 2023, at 08:59, Gary Jennejohn <garyj@gmx.de> wrote:
> Hi Gary,
> >
> > So, now I have a new problem with current.
> >
> > I just now updated my current sources and ran buildworld and buildkern=
el,
> > since Gleb fixed the WITHOUT_PF problem.
> >
> > After installing the new world and kernel I see that ifconfig is dumpi=
ng
> > a core, apparently when it tries to show lo0, since re0 is correctly
> > shown:
> >
> > ifconfig
> > re0: flags=3D8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu=
4088 options=3D82098<VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,WOL_MAGIC,LINKST=
ATE>
> > ether redacted
> > inet 192.168.178.XXX netmask 0xffffff00 broadcast 192.168.178.25=
5
> > Segmentation fault (core dumped)
> Could you please try to narrow down the crashing command? e.g.
> Ifconfig lo0
> Ifconfig lo0 net
> Ifconfig lo0 inet6
> Could you try to rebuild ifconfig w/o netlink (e.g. set WITHOUT_NETLINK=
=3Dyes in the make.conf & make -C sbin/ifconfig clean all install) and see=
if the new binary works?
>
I already have WITHOUT_NETLINK=3Dyes in my /etc/src.conf.
I didn't install ifconfig. I simply started it from the build directory.
ifconfig lo0 shows the settings for lo0 and then dumps core.
> >
> > Unfortunately, I see this error message when I try to look at the core
> > file with gdb:
> >
> > gdb /sbin/ifconfig ifconfig.core
> > ld-elf.so.1: Undefined symbol "rl_eof_found" referenced from COPY
> > relocation in /usr/local/bin/gdb
> Not a specialist here, but if you could build the binary with debug
> (make DEBUG_FLAGS=3D-O0 -g3 sbin/ifconfig clean all install) & share the
> binary & core with me, I could take a look on what?s happening.
> >
I compiled gbd under /usr/ports and it now works, although it's emitting
some weird errors.
-O0 -g3 removes too much and gdb shows no useful information.
With just -g3 I get this output from gdb after running the newly compiled
ifconfig:
Program terminated with signal SIGSEGV, Segmentation fault
warning: Section `.reg-xstate/100294' in core file too small.
#0 lagg_status (ctx=3D0x2f051660ba00) at /usr/src/sbin/ifconfig/iflagg.c:=
223
223 const int verbose =3D ctx->args->verbose;
(gdb) bt
#0 lagg_status (ctx=3D0x2f051660ba00) at /usr/src/sbin/ifconfig/iflagg.c:=
223
#1 0x00002efcf610ea55 in af_other_status (ctx=3D0x2f051660ba00)
at /usr/src/sbin/ifconfig/ifconfig.c:964
#2 status (args=3D0x2f051660ba70, ifa=3D0x2f051a2f2000, sdl=3D<optimized =
out>)
at /usr/src/sbin/ifconfig/ifconfig.c:1788
#3 list_interfaces_ioctl (args=3D0x2f051660ba70)
at /usr/src/sbin/ifconfig/ifconfig.c:845
#4 list_interfaces (args=3D0x2f051660ba70)
at /usr/src/sbin/ifconfig/ifconfig.c:428
#5 main (ac=3D<optimized out>, av=3D<optimized out>)
at /usr/src/sbin/ifconfig/ifconfig.c:724
(gdb)
I looked at ctx:
(gdb) p ctx
$1 =3D (if_ctx *) 0x2f051660ba00
(gdb) p/x *0x2f051660ba00
$2 =3D 0x0 <=3D=3D
(gdb)
So, looks like the problem is in iflagg and ctx is NULL.
=2D-
Gary Jennejohn
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