Mumble: Overlay library crashes due to missing support for DT_GNU_HASH

Created on 16 Jun 2015  路  17Comments  路  Source: mumble-voip/mumble

I've never been able to get this to work (trying on and off for 4y or so). Every attempt goes like this:

 ~ $ mumble-overlay glxgears
set
set
/usr/bin/mumble-overlay: line 63:  5091 Segmentation fault      LD_PRELOAD="${MUMBLE_PRELOAD} ${LD_PRELOAD}" "${@}"

Here's the relevant output of glxinfo:

OpenGL vendor string: X.Org
OpenGL renderer string: Gallium 0.4 on AMD CAICOS
OpenGL core profile version string: 3.3 (Core Profile) Mesa 10.7.0-devel (git-4d35eef)
OpenGL core profile shading language version string: 3.30

One weird thing is if I try to run mumble-overlay glxinfo, it manages to print the "name of display: :0.0" line before crashing.

I've tried getting it to run in gdb but it doesn't seem to want to cooperate, or else I would've provided more useful details here.

bug client linux overlay
Source
picture ghost

All 17 comments

It might be helpful to know what version of mumble this is, and what (presumably Linux) distribution this is on. And -- does glxgears work on this system (i.e. without trying to use the overlay)?

crknadle picture crknadle on 15 Jan 2016
  • Every version of Mumble I've ever tried has been broken, up to and including whatever latest 1.2.y is.
  • Gentoo Linux (both 64 and 32 bit x86). Vanilla, no fancy hardened compiler settings.
  • glxgears works, as does every other OpenGL-using program, and native-D3D9 ones in Wine for that matter.
ghost picture ghost on 15 Jan 2016

Just discovered this from 2014 which sounds like a plausible explanation. Is it accurate?

ghost picture ghost on 11 Oct 2017

What's the status of this issue? 5 years later and mumble-overlay is still completely unusable on Linux...

katp32 picture katp32 on 12 Oct 2020

Which application are you encountering the issue with?

davidebeatrici picture davidebeatrici on 12 Oct 2020

Running any application with mumble-overlay crashes with a segfault. Tested with glxgears and a variety of other applications.

katp32 picture katp32 on 13 Oct 2020

Which distribution are you using? Is Mumble compiled from source or provided as official package?

davidebeatrici picture davidebeatrici on 13 Oct 2020

I'm using Gentoo, and have compiled Mumble from source (using the package provided in Gentoo's official repositories).

katp32 picture katp32 on 13 Oct 2020

Here's some output from gdb, if it's helpful in any way. It doesn't seem to provide any useful information at a glance...

kat@prefect ~ % gdb --args env LD_PRELOAD=/usr/lib64/mumble/libmumble.so glxgears
GNU gdb (Gentoo 9.2 vanilla) 9.2
Copyright (C) 2020 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "x86_64-pc-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://bugs.gentoo.org/>.
Find the GDB manual and other documentation resources online at:
    <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from env...
(No debugging symbols found in env)
(gdb) run
Starting program: /usr/bin/env LD_PRELOAD=/usr/lib64/mumble/libmumble.so glxgears
process 18239 is executing new program: /usr/bin/glxgears
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".

Program received signal SIGSEGV, Segmentation fault.
0x0000000000000000 in ?? ()
(gdb) bt
#0  0x0000000000000000 in ?? ()
#1  0x00007ffff7a55dea in ?? () from /usr/lib64/libGLdispatch.so.0
#2  0x00007ffff7a54179 in ?? () from /usr/lib64/libGLdispatch.so.0
#3  0x00007ffff7fe1e7a in ?? () from /lib64/ld-linux-x86-64.so.2
#4  0x00007ffff7fe1f91 in ?? () from /lib64/ld-linux-x86-64.so.2
#5  0x00007ffff7fd30ca in ?? () from /lib64/ld-linux-x86-64.so.2
#6  0x0000000000000001 in ?? ()
#7  0x00007fffffffe7f6 in ?? ()
#8  0x0000000000000000 in ?? ()
(gdb)
katp32 picture katp32 on 13 Oct 2020

Could you paste here the output of readelf -a /usr/bin/glxgears, please?

davidebeatrici picture davidebeatrici on 13 Oct 2020 
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 Addr: 0x0000000000000d14  Offset: 0x000d14  Link: 4 (.dynsym)
  000:   0 (*local*)       0 (*local*)       0 (*local*)       0 (*local*)    
  004:   0 (*local*)       0 (*local*)       0 (*local*)       0 (*local*)    
  008:   0 (*local*)       0 (*local*)       2 (GLIBC_2.2.5)   0 (*local*)    
  00c:   0 (*local*)       2 (GLIBC_2.2.5)   0 (*local*)       3 (GLIBC_2.3.4)
  010:   2 (GLIBC_2.2.5)   0 (*local*)       2 (GLIBC_2.2.5)   0 (*local*)    
  014:   0 (*local*)       0 (*local*)       0 (*local*)       0 (*local*)    
  018:   0 (*local*)       0 (*local*)       0 (*local*)       0 (*local*)    
  01c:   2 (GLIBC_2.2.5)   0 (*local*)       0 (*local*)       0 (*local*)    
  020:   0 (*local*)       0 (*local*)       0 (*local*)       0 (*local*)    
  024:   0 (*local*)       2 (GLIBC_2.2.5)   0 (*local*)       0 (*local*)    
  028:   0 (*local*)       0 (*local*)       2 (GLIBC_2.2.5)   0 (*local*)    
  02c:   0 (*local*)       4 (GLIBC_2.2.5)   5 (GLIBC_2.4)     0 (*local*)    
  030:   0 (*local*)       0 (*local*)       0 (*local*)       0 (*local*)    
  034:   0 (*local*)       0 (*local*)       0 (*local*)       0 (*local*)    
  038:   0 (*local*)       0 (*local*)       0 (*local*)       0 (*local*)    
  03c:   2 (GLIBC_2.2.5)   0 (*local*)       2 (GLIBC_2.2.5)   0 (*local*)    
  040:   4 (GLIBC_2.2.5)   0 (*local*)       2 (GLIBC_2.2.5)   2 (GLIBC_2.2.5)

Version needs section '.gnu.version_r' contains 2 entries:
 Addr: 0x0000000000000da0  Offset: 0x000da0  Link: 5 (.dynstr)
  000000: Version: 1  File: libm.so.6  Cnt: 1
  0x0010:   Name: GLIBC_2.2.5  Flags: none  Version: 4
  0x0020: Version: 1  File: libc.so.6  Cnt: 3
  0x0030:   Name: GLIBC_2.4  Flags: none  Version: 5
  0x0040:   Name: GLIBC_2.3.4  Flags: none  Version: 3
  0x0050:   Name: GLIBC_2.2.5  Flags: none  Version: 2

Displaying notes found in: .note.ABI-tag
  Owner                Data size    Description
  GNU                  0x00000010   NT_GNU_ABI_TAG (ABI version tag)
    OS: Linux, ABI: 3.2.0
katp32 picture katp32 on 13 Oct 2020

https://github.com/mumble-voip/mumble/blob/caaf516ea50096e10476e76ad20ae2ef8505304b/overlay_gl/init_unix.c#L153-L200

https://bugs.gentoo.org/527504 suggests that the issue happens when libc is built without DT_HASH.

readelf -d /lib/x86_64-linux-gnu/libdl.so.2

Output on my machine:

Dynamic section at offset 0x3d90 contains 29 entries:
  Tag        Type                         Name/Value
 0x0000000000000001 (NEEDED)             Shared library: [libc.so.6]
 0x0000000000000001 (NEEDED)             Shared library: [ld-linux-x86-64.so.2]
 0x000000000000000e (SONAME)             Library soname: [libdl.so.2]
 0x000000000000000c (INIT)               0x1000
 0x000000000000000d (FINI)               0x2048
 0x0000000000000019 (INIT_ARRAY)         0x4d70
 0x000000000000001b (INIT_ARRAYSZ)       16 (bytes)
 0x000000000000001a (FINI_ARRAY)         0x4d80
 0x000000000000001c (FINI_ARRAYSZ)       16 (bytes)
 0x0000000000000004 (HASH)               0x280
 0x000000006ffffef5 (GNU_HASH)           0x438
 0x0000000000000005 (STRTAB)             0x908
 0x0000000000000006 (SYMTAB)             0x500
 0x000000000000000a (STRSZ)              569 (bytes)
 0x000000000000000b (SYMENT)             24 (bytes)
 0x0000000000000003 (PLTGOT)             0x5000
 0x0000000000000002 (PLTRELSZ)           312 (bytes)
 0x0000000000000014 (PLTREL)             RELA
 0x0000000000000017 (JMPREL)             0xe38
 0x0000000000000007 (RELA)               0xca0
 0x0000000000000008 (RELASZ)             408 (bytes)
 0x0000000000000009 (RELAENT)            24 (bytes)
 0x000000006ffffffc (VERDEF)             0xb98
 0x000000006ffffffd (VERDEFNUM)          5
 0x000000006ffffffe (VERNEED)            0xc40
 0x000000006fffffff (VERNEEDNUM)         2
 0x000000006ffffff0 (VERSYM)             0xb42
 0x000000006ffffff9 (RELACOUNT)          5
 0x0000000000000000 (NULL)               0x0

Could you paste the output of the command, please? if HASH is missing, we know the bug report is right.

davidebeatrici picture davidebeatrici on 13 Oct 2020 
Dynamic section at offset 0x3ec0 contains 30 entries:
  Tag        Type                         Name/Value
 0x00000001 (NEEDED)                     Shared library: [libc.so.6]
 0x00000001 (NEEDED)                     Shared library: [ld-linux.so.2]
 0x0000000e (SONAME)                     Library soname: [libdl.so.2]
 0x0000000c (INIT)                       0x1000
 0x0000000d (FINI)                       0x2244
 0x00000019 (INIT_ARRAY)                 0x4eb0
 0x0000001b (INIT_ARRAYSZ)               8 (bytes)
 0x0000001a (FINI_ARRAY)                 0x4eb8
 0x0000001c (FINI_ARRAYSZ)               8 (bytes)
 0x6ffffef5 (GNU_HASH)                   0x174
 0x00000005 (STRTAB)                     0x52c
 0x00000006 (SYMTAB)                     0x25c
 0x0000000a (STRSZ)                      582 (bytes)
 0x0000000b (SYMENT)                     16 (bytes)
 0x00000003 (PLTGOT)                     0x5000
 0x00000002 (PLTRELSZ)                   104 (bytes)
 0x00000014 (PLTREL)                     REL
 0x00000017 (JMPREL)                     0x99c
 0x00000011 (REL)                        0x914
 0x00000012 (RELSZ)                      136 (bytes)
 0x00000013 (RELENT)                     8 (bytes)
 0x6ffffffc (VERDEF)                     0x7cc
 0x6ffffffd (VERDEFNUM)                  6
 0x0000001e (FLAGS)                      BIND_NOW
 0x6ffffffb (FLAGS_1)                    Flags: NOW
 0x6ffffffe (VERNEED)                    0x894
 0x6fffffff (VERNEEDNUM)                 2
 0x6ffffff0 (VERSYM)                     0x772
 0x6ffffffa (RELCOUNT)                   5
 0x00000000 (NULL)                       0x0

(note that I used /lib/libdl.so.2, as the given file doesn't exist on my system)

katp32 picture katp32 on 13 Oct 2020

Ah, sorry, that's the 32bit copy. Here's /lib64/libdl.so.2:


Dynamic section at offset 0x2d80 contains 30 entries:
  Tag        Type                         Name/Value
 0x0000000000000001 (NEEDED)             Shared library: [libc.so.6]
 0x0000000000000001 (NEEDED)             Shared library: [ld-linux-x86-64.so.2]
 0x000000000000000e (SONAME)             Library soname: [libdl.so.2]
 0x000000000000000c (INIT)               0x1000
 0x000000000000000d (FINI)               0x1f08
 0x0000000000000019 (INIT_ARRAY)         0x3d60
 0x000000000000001b (INIT_ARRAYSZ)       16 (bytes)
 0x000000000000001a (FINI_ARRAY)         0x3d70
 0x000000000000001c (FINI_ARRAYSZ)       16 (bytes)
 0x000000006ffffef5 (GNU_HASH)           0x258
 0x0000000000000005 (STRTAB)             0x728
 0x0000000000000006 (SYMTAB)             0x320
 0x000000000000000a (STRSZ)              569 (bytes)
 0x000000000000000b (SYMENT)             24 (bytes)
 0x0000000000000003 (PLTGOT)             0x4000
 0x0000000000000002 (PLTRELSZ)           312 (bytes)
 0x0000000000000014 (PLTREL)             RELA
 0x0000000000000017 (JMPREL)             0xc58
 0x0000000000000007 (RELA)               0xac0
 0x0000000000000008 (RELASZ)             408 (bytes)
 0x0000000000000009 (RELAENT)            24 (bytes)
 0x000000006ffffffc (VERDEF)             0x9b8
 0x000000006ffffffd (VERDEFNUM)          5
 0x000000000000001e (FLAGS)              BIND_NOW
 0x000000006ffffffb (FLAGS_1)            Flags: NOW
 0x000000006ffffffe (VERNEED)            0xa60
 0x000000006fffffff (VERNEEDNUM)         2
 0x000000006ffffff0 (VERSYM)             0x962
 0x000000006ffffff9 (RELACOUNT)          5
 0x0000000000000000 (NULL)               0x0
katp32 picture katp32 on 13 Oct 2020

Could you confirm that #4534 fixes the issue, please?

davidebeatrici picture davidebeatrici on 14 Oct 2020
🎉1

Indeed, it does. Confirmed on Gentoo x86_64

katp32 picture katp32 on 14 Oct 2020
👍1

Awesome, thank you very much for your help!

davidebeatrici picture davidebeatrici on 14 Oct 2020
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