(gdb) break /home/ubuntu/binutils-gdb/gdb/testsuite/gdb.base/annota1.c:28
Breakpoint 1 at 0x100006e4: file
/home/ubuntu/binutils-gdb/gdb/testsuite/gdb.base/annota1.c, line 28.
(gdb) run
Starting program: /tmp/foo
Can't read symbols from system-supplied DSO at 0x3fffb7fa0000: File truncated
Breakpoint 1, main () at
/home/ubuntu/binutils-gdb/gdb/testsuite/gdb.base/annota1.c:28
28 int my_array[3] = { 1, 2, 3 }; /* break main */
I wonder if the gdb complaint about the kernel VDSO is causing the test to
fail. The warning is almost certainly a result of
this kernel patch:
commit 24b659a13866b935eca72748ce725279bd3c4466
Author: Anton Blanchard <an...@au1.ibm.com>
Date: Wed Feb 12 17:18:50 2014 +1100
powerpc: Use unstripped VDSO image for more accurate profiling data
We are seeing a lot of hits in the VDSO that are not resolved by perf.
A while(1) gettimeofday() loop shows the issue:
27.64% [vdso] [.] 0x000000000000060c
22.57% [vdso] [.] 0x0000000000000628
16.88% [vdso] [.] 0x0000000000000610
12.39% [vdso] [.] __kernel_gettimeofday
6.09% [vdso] [.] 0x00000000000005f8
3.58% test [.] 00000037.plt_call.gettimeofday@@GLIBC_2.18
2.94% [vdso] [.] __kernel_datapage_offset
2.90% test [.] main
We are using a stripped VDSO image which means only symbols with
relocation info can be resolved. There isn't a lot of point to
stripping the VDSO, the debug info is only about 1kB:
4680 arch/powerpc/kernel/vdso64/vdso64.so
5815 arch/powerpc/kernel/vdso64/vdso64.so.dbg
By using the unstripped image, we can resolve all the symbols in the
VDSO and the perf profile data looks much better:
76.53% [vdso] [.] __do_get_tspec
12.20% [vdso] [.] __kernel_gettimeofday
5.05% [vdso] [.] __get_datapage
3.20% test [.] main
2.92% test [.] 00000037.plt_call.gettimeofday@@GLIBC_2.18
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https://bugs.launchpad.net/bugs/1365664
Title:
gdb source test suites are failing in Ubuntu14.10
Status in “gdb” package in Ubuntu:
Confirmed
Bug description:
---Problem Description---
gdb source test suites are failing in Ubuntu14.10
Machine Type = P8
---Steps to Reproduce---
Install a P8 system with Power KVM and then install Ubuntu 14.10 guest.
Then try to build and execute the gdb source test suites as below.
root@ubuntu:~# apt-get source gdb
root@ubuntu:~# cd gdb-7.8/
root@ubuntu:~/gdb-7.8# dpkg-buildpackage -b 2>&1 | tee gdblog
=== gdb Summary ===
# of expected passes 25009
# of unexpected failures 287
# of unexpected successes 2
# of expected failures 66
# of unknown successes 1
# of known failures 59
# of unresolved testcases 3
# of untested testcases 19
# of unsupported tests 100
---uname output---
Linux ubuntu 3.16.0-11-generic #16-Ubuntu SMP Mon Aug 25 20:02:00 UTC 2014
ppc64le ppc64le ppc64le GNU/Linux
I've retested gdb from Ubuntu 14.04 (gdb-7.7-0ubuntu3.1) in the Ubuntu 14.10
VM provided by Pavaman and the number of failures curiously increased to 250
(in comparison to less than 140 on 14.04), which leads me to believe that there
is something in the environment of Ubuntu 14.10 compromising gdb functionality
in several testcases.
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