linux-kernel - "Test object code reading" failing, debug messages don't help

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Date:	Mon, 11 Nov 2013 16:51:17 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>, Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephane Eranian <eranian@...gle.com>,
	linux-kernel@...r.kernel.org
Subject: "Test object code reading" failing, debug messages don't help

Hi Adrian,

	I have perf test failing here:

[root@...andy ~]# perf test 21
21: Test object code reading                               : FAILED!
[root@...andy ~]# 

Try it with -v, but all messages, except for that elf header, which I
assume is for a previous entry that is not suitable and should not be
considered, seems to say all is well, except that the test fails :-\

[root@...andy ~]# perf test -v 21
21: Test object code reading                               :
--- start ---
Looking at the vmlinux_path (6 entries long)
symsrc__init: cannot get elf header.
Using /lib/modules/3.12.0-rc6+/build/vmlinux for symbols
Parsing event 'cycles'
mmap size 528384B
Reading object code for memory address: 0xffffffff8101d2ad
File is: /lib/modules/3.12.0-rc6+/build/vmlinux
On file address is: 0x21d2ad
Objdump command is: objdump -d --start-address=0xffffffff8101d2ad --stop-address=0xffffffff8101d32d /lib/modules/3.12.0-rc6+/build/vmlinux
Bytes read match those read by objdump
Reading object code for memory address: 0xffffffff8101d2ad
File is: /lib/modules/3.12.0-rc6+/build/vmlinux
On file address is: 0x21d2ad
Objdump command is: objdump -d --start-address=0xffffffff8101d2ad --stop-address=0xffffffff8101d32d /lib/modules/3.12.0-rc6+/build/vmlinux
Bytes read match those read by objdump
Reading object code for memory address: 0xffffffff8101d2ad
File is: /lib/modules/3.12.0-rc6+/build/vmlinux
On file address is: 0x21d2ad
Objdump command is: objdump -d --start-address=0xffffffff8101d2ad --stop-address=0xffffffff8101d32d /lib/modules/3.12.0-rc6+/build/vmlinux
Bytes read match those read by objdump
Reading object code for memory address: 0xffffffff8101d2ad
File is: /lib/modules/3.12.0-rc6+/build/vmlinux
On file address is: 0x21d2ad
Objdump command is: objdump -d --start-address=0xffffffff8101d2ad --stop-address=0xffffffff8101d32d /lib/modules/3.12.0-rc6+/build/vmlinux
Bytes read match those read by objdump
Reading object code for memory address: 0xffffffff8101d2ad
File is: /lib/modules/3.12.0-rc6+/build/vmlinux
On file address is: 0x21d2ad
Objdump command is: objdump -d --start-address=0xffffffff8101d2ad --stop-address=0xffffffff8101d32d /lib/modules/3.12.0-rc6+/build/vmlinux
Bytes read match those read by objdump
Reading object code for memory address: 0xffffffff81124ae5
File is: /lib/modules/3.12.0-rc6+/build/vmlinux
On file address is: 0x324ae5
Objdump command is: objdump -d --start-address=0xffffffff81124ae5 --stop-address=0xffffffff81124b65 /lib/modules/3.12.0-rc6+/build/vmlinux
Bytes read match those read by objdump
---- end ----
Test object code reading: FAILED!
[root@...andy ~]#

Can you try this on acme/perf/core? And improve the debug messages, if
possible?

- Arnaldo
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