| 2021-03-07 07:06:40 |
Ppluzhnikov-google |
bug |
|
|
added bug |
| 2021-05-21 10:34:06 |
Balint Reczey |
nominated for series |
|
Ubuntu Focal |
|
| 2021-05-21 10:34:06 |
Balint Reczey |
bug task added |
|
glibc (Ubuntu Focal) |
|
| 2021-05-21 10:34:06 |
Balint Reczey |
nominated for series |
|
Ubuntu Hirsute |
|
| 2021-05-21 10:34:06 |
Balint Reczey |
bug task added |
|
glibc (Ubuntu Hirsute) |
|
| 2021-05-21 10:34:06 |
Balint Reczey |
nominated for series |
|
Ubuntu Groovy |
|
| 2021-05-21 10:34:06 |
Balint Reczey |
bug task added |
|
glibc (Ubuntu Groovy) |
|
| 2021-05-21 10:37:18 |
Balint Reczey |
glibc (Ubuntu): status |
New |
Fix Released |
|
| 2021-06-01 15:57:16 |
Balint Reczey |
description |
lsb_release -rd
Description: Ubuntu 20.04.2 LTS
Release: 20.04
Using gdb 9.2-0ubuntu1~20.04, libc6 and libc6-dbg 2.31-0ubuntu9.2
gdb -q /bin/date
Reading symbols from /bin/date...
(No debugging symbols found in /bin/date)
(gdb) starti
Starting program: /usr/bin/date
Program stopped.
0x00007ffff7fd0100 in ?? () from /lib64/ld-linux-x86-64.so.2
(gdb) b _dl_debug_state
Breakpoint 1 at 0x7ffff7fe11d0
(gdb) c
Continuing.
Breakpoint 1, 0x00007ffff7fe11d0 in _dl_debug_state () from /lib64/ld-linux-x86-64.so.2
(gdb) bt
#0 0x00007ffff7fe11d0 in _dl_debug_state () from /lib64/ld-linux-x86-64.so.2
#1 0x00007ffff7fd2fd1 in ?? () from /lib64/ld-linux-x86-64.so.2
#2 0x00007ffff7febc3b in ?? () from /lib64/ld-linux-x86-64.so.2
#3 0x00007ffff7fd104c in ?? () from /lib64/ld-linux-x86-64.so.2
#4 0x00007ffff7fd0108 in ?? () from /lib64/ld-linux-x86-64.so.2
#5 0x0000000000000001 in ?? ()
#6 0x00007fffffffe58c in ?? ()
#7 0x0000000000000000 in ?? ()
Note that debug info for ld-linux is missing despite libc6-dbg being installed.
(gdb) disable 1
(gdb) catch syscall exit_group
Catchpoint 2 (syscall 'exit_group' [231])
(gdb) c
Continuing.
Sat Mar 6 22:47:08 PST 2021
Catchpoint 2 (call to syscall exit_group), __GI__exit (status=status@entry=0) at ../sysdeps/unix/sysv/linux/_exit.c:31
31 ../sysdeps/unix/sysv/linux/_exit.c: No such file or directory.
Note that debug info for `libc.so.6` was loaded correctly, but debug info for ld-linux was not.
(gdb) info shared
From To Syms Read Shared Object Library
0x00007ffff7fd0100 0x00007ffff7ff2674 Yes (*) /lib64/ld-linux-x86-64.so.2
0x00007ffff7df4630 0x00007ffff7f6920d Yes /lib/x86_64-linux-gnu/libc.so.6
(*): Shared library is missing debugging information.
----
As far as I can tell, this is happening because libc6-dbg installs ld-2.31.so into the wrong place:
dpkg -L libc6-dbg | grep /ld-2.31
/usr/lib/debug/lib/libc6-prof/x86_64-linux-gnu/ld-2.31.so
/usr/lib/debug/lib/x86_64-linux-gnu/ld-2.31.so
Since ld-linux resolves to /lib64/ld-linux-x86-64.so.2, GDB looks for debug symbols in the following paths:
/lib64/.debug/ld-2.31.so
/usr/lib/debug/lib64/ld-2.31.so
/usr/lib/x86_64-linux-gnu/.debug/ld-2.31.so
/usr/lib/debug/usr/lib/x86_64-linux-gnu/ld-2.31.so
/usr/lib/x86_64-linux-gnu/.debug/ld-2.31.so
/usr/lib/debug/usr/lib/x86_64-linux-gnu/ld-2.31.so
None of these matches the actual installed path, so debug symbols are not loaded.
P.S. Manually adding symbols via add-symbol-file /usr/lib/debug/lib/x86_64-linux-gnu/ld-2.31.so works fine, but this should be automatic.
P.P.S. After running
sudo mkdir /usr/lib/debug/lib64
sudo ln -s /usr/lib/debug/lib/x86_64-linux-gnu/ld-2.31.so /usr/lib/debug/lib64
things start working as expected:
gdb -q /bin/date
Reading symbols from /bin/date...
(No debugging symbols found in /bin/date)
(gdb) starti
Starting program: /usr/bin/date
Program stopped.
0x00007ffff7fd0100 in _start () from /lib64/ld-linux-x86-64.so.2
(gdb) b _dl_debug_state
Breakpoint 1 at 0x7ffff7fe11d0: file dl-debug.c, line 73.
(gdb) c
Continuing.
Breakpoint 1, __GI__dl_debug_state () at dl-debug.c:73
73 dl-debug.c: No such file or directory.
(gdb) bt
#0 __GI__dl_debug_state () at dl-debug.c:73
#1 0x00007ffff7fd2fd1 in dl_main (phdr=<optimized out>, phnum=<optimized out>, user_entry=<optimized out>, auxv=<optimized out>) at rtld.c:1661
#2 0x00007ffff7febc3b in _dl_sysdep_start (start_argptr=start_argptr@entry=0x7fffffffe390, dl_main=dl_main@entry=0x7ffff7fd15e0 <dl_main>) at ../elf/dl-sysdep.c:252
#3 0x00007ffff7fd104c in _dl_start_final (arg=0x7fffffffe390) at rtld.c:449
#4 _dl_start (arg=0x7fffffffe390) at rtld.c:539
#5 0x00007ffff7fd0108 in _start () from /lib64/ld-linux-x86-64.so.2
#6 0x0000000000000001 in ?? ()
#7 0x00007fffffffe5c8 in ?? ()
#8 0x0000000000000000 in ?? ()
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: libc6-dbg 2.31-0ubuntu9.2
Uname: Linux 5.4.72-microsoft-standard-WSL2 x86_64
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
CasperMD5CheckResult: skip
Date: Sat Mar 6 22:39:51 2021
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
LANG=C.UTF-8
SHELL=/bin/bash
SourcePackage: glibc
UpgradeStatus: No upgrade log present (probably fresh install) |
[Impact]
* Debug files for ld-linux are not found by gdb making debugging programs harder.
[Test Plan]
* Run a gdb debugging session and observe symbols from ld-linux shown properly:
root@ii:~# gdb -q /bin/date
Reading symbols from /bin/date...
Download failed: Function not implemented. Continuing without debug info for /bin/date.
(No debugging symbols found in /bin/date)
(gdb) starti
Starting program: /usr/bin/date
Download failed: Function not implemented. Continuing without debug info for /root/system-supplied DSO at 0x7ffff7fc6000.
Program stopped.
0x00007ffff7fc90d0 in _start () from /lib64/ld-linux-x86-64.so.2
(gdb) b _dl_debug_state
Download failed: Function not implemented. Continuing without source file ./elf/dl-debug.c.
Breakpoint 1 at 0x7ffff7fd9fc0: file dl-debug.c, line 73.
(gdb) c
Continuing.
Breakpoint 1, __GI__dl_debug_state () at dl-debug.c:73
Download failed: Function not implemented. Continuing without source file ./elf/dl-debug.c.
73 dl-debug.c: No such file or directory.
(gdb) bt
#0 __GI__dl_debug_state () at dl-debug.c:73
#1 0x00007ffff7fcc18e in dl_main (phdr=<optimized out>, phnum=<optimized out>, user_entry=<optimized out>, auxv=<optimized out>) at rtld.c:1810
#2 0x00007ffff7fe73df in _dl_sysdep_start (start_argptr=start_argptr@entry=0x7fffffffe5c0, dl_main=dl_main@entry=0x7ffff7fca610 <dl_main>) at ../elf/dl-sysdep.c:250
#3 0x00007ffff7fca11a in _dl_start_final (arg=0x7fffffffe5c0) at rtld.c:490
#4 _dl_start (arg=0x7fffffffe5c0) at rtld.c:583
#5 0x00007ffff7fc90d8 in _start () from /lib64/ld-linux-x86-64.so.2
#6 0x0000000000000001 in ?? ()
#7 0x00007fffffffe7fa in ?? ()
#8 0x0000000000000000 in ?? ()
[Where problems could occur]
* The fix is dropping using DH_COMPAT=8 for dh_strip. This override for compat level was in place to work around a valgrind issue ( https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=677876 ) that has been fixed already in Ubuntu 18.04 and later releases. Almost all other packages use the default compat level for dh_strip thus there is no expected problem to occur.
[Original Bug Text]
lsb_release -rd
Description: Ubuntu 20.04.2 LTS
Release: 20.04
Using gdb 9.2-0ubuntu1~20.04, libc6 and libc6-dbg 2.31-0ubuntu9.2
gdb -q /bin/date
Reading symbols from /bin/date...
(No debugging symbols found in /bin/date)
(gdb) starti
Starting program: /usr/bin/date
Program stopped.
0x00007ffff7fd0100 in ?? () from /lib64/ld-linux-x86-64.so.2
(gdb) b _dl_debug_state
Breakpoint 1 at 0x7ffff7fe11d0
(gdb) c
Continuing.
Breakpoint 1, 0x00007ffff7fe11d0 in _dl_debug_state () from /lib64/ld-linux-x86-64.so.2
(gdb) bt
#0 0x00007ffff7fe11d0 in _dl_debug_state () from /lib64/ld-linux-x86-64.so.2
#1 0x00007ffff7fd2fd1 in ?? () from /lib64/ld-linux-x86-64.so.2
#2 0x00007ffff7febc3b in ?? () from /lib64/ld-linux-x86-64.so.2
#3 0x00007ffff7fd104c in ?? () from /lib64/ld-linux-x86-64.so.2
#4 0x00007ffff7fd0108 in ?? () from /lib64/ld-linux-x86-64.so.2
#5 0x0000000000000001 in ?? ()
#6 0x00007fffffffe58c in ?? ()
#7 0x0000000000000000 in ?? ()
Note that debug info for ld-linux is missing despite libc6-dbg being installed.
(gdb) disable 1
(gdb) catch syscall exit_group
Catchpoint 2 (syscall 'exit_group' [231])
(gdb) c
Continuing.
Sat Mar 6 22:47:08 PST 2021
Catchpoint 2 (call to syscall exit_group), __GI__exit (status=status@entry=0) at ../sysdeps/unix/sysv/linux/_exit.c:31
31 ../sysdeps/unix/sysv/linux/_exit.c: No such file or directory.
Note that debug info for `libc.so.6` was loaded correctly, but debug info for ld-linux was not.
(gdb) info shared
From To Syms Read Shared Object Library
0x00007ffff7fd0100 0x00007ffff7ff2674 Yes (*) /lib64/ld-linux-x86-64.so.2
0x00007ffff7df4630 0x00007ffff7f6920d Yes /lib/x86_64-linux-gnu/libc.so.6
(*): Shared library is missing debugging information.
----
As far as I can tell, this is happening because libc6-dbg installs ld-2.31.so into the wrong place:
dpkg -L libc6-dbg | grep /ld-2.31
/usr/lib/debug/lib/libc6-prof/x86_64-linux-gnu/ld-2.31.so
/usr/lib/debug/lib/x86_64-linux-gnu/ld-2.31.so
Since ld-linux resolves to /lib64/ld-linux-x86-64.so.2, GDB looks for debug symbols in the following paths:
/lib64/.debug/ld-2.31.so
/usr/lib/debug/lib64/ld-2.31.so
/usr/lib/x86_64-linux-gnu/.debug/ld-2.31.so
/usr/lib/debug/usr/lib/x86_64-linux-gnu/ld-2.31.so
/usr/lib/x86_64-linux-gnu/.debug/ld-2.31.so
/usr/lib/debug/usr/lib/x86_64-linux-gnu/ld-2.31.so
None of these matches the actual installed path, so debug symbols are not loaded.
P.S. Manually adding symbols via add-symbol-file /usr/lib/debug/lib/x86_64-linux-gnu/ld-2.31.so works fine, but this should be automatic.
P.P.S. After running
sudo mkdir /usr/lib/debug/lib64
sudo ln -s /usr/lib/debug/lib/x86_64-linux-gnu/ld-2.31.so /usr/lib/debug/lib64
things start working as expected:
gdb -q /bin/date
Reading symbols from /bin/date...
(No debugging symbols found in /bin/date)
(gdb) starti
Starting program: /usr/bin/date
Program stopped.
0x00007ffff7fd0100 in _start () from /lib64/ld-linux-x86-64.so.2
(gdb) b _dl_debug_state
Breakpoint 1 at 0x7ffff7fe11d0: file dl-debug.c, line 73.
(gdb) c
Continuing.
Breakpoint 1, __GI__dl_debug_state () at dl-debug.c:73
73 dl-debug.c: No such file or directory.
(gdb) bt
#0 __GI__dl_debug_state () at dl-debug.c:73
#1 0x00007ffff7fd2fd1 in dl_main (phdr=<optimized out>, phnum=<optimized out>, user_entry=<optimized out>, auxv=<optimized out>) at rtld.c:1661
#2 0x00007ffff7febc3b in _dl_sysdep_start (start_argptr=start_argptr@entry=0x7fffffffe390, dl_main=dl_main@entry=0x7ffff7fd15e0 <dl_main>) at ../elf/dl-sysdep.c:252
#3 0x00007ffff7fd104c in _dl_start_final (arg=0x7fffffffe390) at rtld.c:449
#4 _dl_start (arg=0x7fffffffe390) at rtld.c:539
#5 0x00007ffff7fd0108 in _start () from /lib64/ld-linux-x86-64.so.2
#6 0x0000000000000001 in ?? ()
#7 0x00007fffffffe5c8 in ?? ()
#8 0x0000000000000000 in ?? ()
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: libc6-dbg 2.31-0ubuntu9.2
Uname: Linux 5.4.72-microsoft-standard-WSL2 x86_64
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
CasperMD5CheckResult: skip
Date: Sat Mar 6 22:39:51 2021
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
LANG=C.UTF-8
SHELL=/bin/bash
SourcePackage: glibc
UpgradeStatus: No upgrade log present (probably fresh install) |
|
| 2021-11-15 01:37:53 |
Michael Hudson-Doyle |
glibc (Ubuntu Groovy): status |
New |
Won't Fix |
|
| 2021-11-15 01:38:00 |
Michael Hudson-Doyle |
glibc (Ubuntu Focal): status |
New |
In Progress |
|
| 2021-12-13 06:02:08 |
Steve Langasek |
glibc (Ubuntu Focal): status |
In Progress |
Fix Committed |
|
| 2021-12-13 06:02:12 |
Steve Langasek |
bug |
|
|
added subscriber Ubuntu Stable Release Updates Team |
| 2021-12-13 06:02:14 |
Steve Langasek |
bug |
|
|
added subscriber SRU Verification |
| 2021-12-13 06:02:20 |
Steve Langasek |
tags |
amd64 apport-bug focal uec-images |
amd64 apport-bug focal uec-images verification-needed verification-needed-focal |
|
| 2022-01-25 08:07:10 |
Michael Hudson-Doyle |
tags |
amd64 apport-bug focal uec-images verification-needed verification-needed-focal |
amd64 apport-bug focal uec-images verification-done verification-done-focal |
|
| 2022-02-10 21:48:26 |
Brian Murray |
tags |
amd64 apport-bug focal uec-images verification-done verification-done-focal |
amd64 apport-bug focal uec-images verification-needed verification-needed-focal |
|
| 2022-03-16 21:54:16 |
Brian Murray |
glibc (Ubuntu Hirsute): status |
New |
Won't Fix |
|
| 2022-04-26 01:06:48 |
Michael Hudson-Doyle |
tags |
amd64 apport-bug focal uec-images verification-needed verification-needed-focal |
amd64 apport-bug focal uec-images verification-done-focal |
|
| 2022-05-11 01:44:45 |
Chris Halse Rogers |
removed subscriber Ubuntu Stable Release Updates Team |
|
|
|
| 2022-05-11 01:47:31 |
Launchpad Janitor |
glibc (Ubuntu Focal): status |
Fix Committed |
Fix Released |
|
| 2022-05-30 15:24:13 |
Matthias Klose |
glibc (Ubuntu Focal): status |
Fix Released |
New |
|
| 2022-05-30 15:24:29 |
Matthias Klose |
tags |
amd64 apport-bug focal uec-images verification-done-focal |
amd64 apport-bug focal rls-ff-incoming uec-images verification-done-focal |
|
| 2022-07-13 11:08:38 |
Launchpad Janitor |
glibc (Ubuntu Focal): status |
New |
Confirmed |
|
| 2023-05-31 15:43:35 |
Simon Chopin |
glibc (Ubuntu Focal): status |
Confirmed |
Fix Released |
|
