Date: Mon, 3 Aug 2020 21:26:52 -0700 From: Kevin Oberman <rkoberman@gmail.com> To: Niclas Zeising <zeising+freebsd@daemonic.se> Cc: "freebsd-x11@freebsd.org" <x11@freebsd.org>, emacs@freebsd.org Subject: Re: Recent libX11 update broke emacs Message-ID: <CAN6yY1sUeG-aCwq4yfwhXzf=aSq5hrOCXW_WhN8dYKFZ1=hA_Q@mail.gmail.com> In-Reply-To: <3fd8de9f-5746-1216-6047-af576d851b1a@daemonic.se> References: <CAN6yY1sOsGd5YdjAMdO01opmDvV8LRcqPQUg3gze5yu0XOKShQ@mail.gmail.com> <3fd8de9f-5746-1216-6047-af576d851b1a@daemonic.se>
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On Mon, Aug 3, 2020 at 3:09 PM Niclas Zeising <zeising+freebsd@daemonic.se> wrote: > On 2020-08-03 19:07, Kevin Oberman wrote: > > This is a weird problem and I'm uncertain if it is in libW11, x11-server, > > or emacs. As a result, I'm crossposting to both lists. > > > > Yesterday, after upgrading libX11 and x11-server, I could no longer run > > Emacs to an X display. It crashed quickly with a segmentation error in > the > > pthread library. Oddly, I could run it to my local xserver from a remote > > system. > > Where does the segfault occur before entering pthreads? Here is a backtrace with symbols: * thread #1, name = 'emacs-28.0.50', stop reason = signal SIGSEGV * frame #0: 0x000000002dc8584a frame #1: 0x000000002dc83ca4 frame #2: 0x0000000000374fc0 emacs`detect_coding_utf_16(coding=0x00000000f2ee705a, detect_info=0x0000000009d690dc) at coding.c:0:4 frame #3: 0x000000000039584e emacs`encode_invocation_designation(charset=0x000000000039584e, coding=0x000000000083da20, dst="", p_nchars=0x000000000000000b) at coding.c:4273:15 frame #4: 0x00000000003958c3 emacs`encode_invocation_designation(charset=0x000000000083e230, coding=0x0000000000000000, dst="", p_nchars=0x000000000083da40) at coding.c:4280:4 frame #5: 0x0000000000393df9 emacs`coding_alloc_by_realloc(coding=0x0000000000393df9, bytes=8641104) at coding.c:1012:7 frame #6: 0x0000000000395906 emacs`encode_invocation_designation(charset=0x000000000083dec0, coding=0x000000000083de40, dst="", p_nchars=0x000000000083da70) at coding.c:4285:6 thread #2, name = 'emacs-28.0.50', stop reason = signal SIGSEGV frame #0: 0x000000002dc2beda frame #1: 0x000000002c929a26 thread #3, name = 'emacs-28.0.50', stop reason = signal SIGSEGV frame #0: 0x000000002dc2beda frame #1: 0x000000002c929a26 thread #4, name = 'emacs-28.0.50', stop reason = signal SIGSEGV frame #0: 0x000000002dc2beda frame #1: 0x000000002c929a26 > > > > Rolling back the x11 server did not help nor did rolling back libX11 or > > even both of them. I had to roll back libX11 first and build the server > > with the old libX11. Rebuilding emacs with the new ports made no > difference. > > Which version of the server did you build? The patch to xorg-server is > trivial, just switching out malloc for calloc have the memory 0 > initialized. The patch to libX11 is rather more involved. > It is possible that someone accidentally changed the ABI of libX11, I > guess. What happens if you use the version with just the security fixes > (the version I committed first, and that was merged to the Q3 branch.) > The problem seems almost certainly with libX11, not xorg-server-1.20.8_3,1. I had to build the server against the old libX11 to get emacs to run. I am running 12-Stable of yesterday, r363784, with GENERIC except using SCHED_4BSD. I build ports on this system, so packages are not relevant. > Since the old libX11 contains a very serious vulnerability, I really hate > > to leave it this way, but I also have a hard time getting anything done > > without emacs. Nothing other than emacs seems to have a problem with this > > There is one commit after libX11 1.6.10, that takes care of a regression. > Can you apply > > https://gitlab.freedesktop.org/xorg/lib/libx11/-/commit/93fce3f4e79cbc737d6468a4f68ba3de1b83953b > on top of the libX11 1.6.10 update and see if that fixes anything? > No improvement. > > Regards > -- > Niclas > -- Kevin Oberman, Part time kid herder and retired Network Engineer E-mail: rkoberman@gmail.com PGP Fingerprint: D03FB98AFA78E3B78C1694B318AB39EF1B055683
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