(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 <[email protected]>
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
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