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From: ahmadkhorrami <ahmadkhorrami@ut.ac.ir>
To: Milian Wolff <milian.wolff@kdab.com>
Cc: Jiri Olsa <jolsa@redhat.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Arnaldo Carvalho de Melo <acme@redhat.com>,
	Linux-trace Users <linux-trace-users@vger.kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	linux-trace-users-owner@vger.kernel.org,
	Jin Yao <yao.jin@linux.intel.com>,
	Namhyung Kim <namhyung@kernel.org>,
	Changbin Du <changbin.du@intel.com>,
	Andi Kleen <ak@linux.intel.com>
Subject: Re: Wrong Perf Backtraces
Date: Fri, 27 Mar 2020 17:28:33 +0430
Message-ID: <ca0cb1410a799267a2e1e23b6e8f7535@ut.ac.ir> (raw)
In-Reply-To: <2478802.X9hSmTKtgW@agathebauer>

Hi,
Thanks Milian. So if I am right, I should do the following:
1) Run "perf buildid-list" and catch all the <file path, build-ids> 
pairs.
2) First check for the existence of the file path.
3) If failed, concatenate "~/.debug", file path, "/" and buildid and use 
it as the alternative.
I thought that GDB is smart enough to detect these situations in the 
same way that it detects debug info files.
Should I check any directory other than ~/.debug?
Regards.

On 2020-03-27 16:40, Milian Wolff wrote:

> On Freitag, 27. März 2020 12:04:20 CET ahmadkhorrami wrote:
> 
>> I do the following:
>> If this line is in the perf script backtrace:
>> 7f21ffe256db g_main_context_iteration+0x2b
>> (/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.5600.4)
>> I run the following command:
>> gdb -batch -ex 'file 
>> /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.5600.4'
>> -ex 'disass g_main_context_iteration'.
> 
> You can try to parse the output of `perf buildid-list` to get a mapping 
> that
> can be used to run this on another person's machine. E.g.
> 
> ```
> $ perf buildid-list
> 5837b1e7495db791f9a3a56fb6ca29958da75b0c [kernel.kallsyms]
> 845f98f6a3019620c37a2f611b2f20c27de83d5b 
> /home/milian/projects/kdab/rnd/
> hotspot/build/tests/test-clients/cpp-parallel/cpp-parallel
> f6ca5853dae87d9f0503a9ef230f6d1fa15a832d /usr/lib/ld-2.30.so
> 92883b06055e8e21ded8eb0cd5a61f5704531152 [vdso]
> 8b04d1825b63d9a600e3d57ac71058935e7ad757 /usr/lib/libpthread-2.30.so
> 09639b80a8fad179004f2484608764d2b336dd4a /usr/lib/libstdc++.so.6.0.27
> 33d1f350f13728651d74dd2a56bad1e4e4648f5e /usr/lib/libc-2.30.so
> $ file 
> ~/.debug/usr/lib/ld-2.30.so/f6ca5853dae87d9f0503a9ef230f6d1fa15a832d/
> elf
> /home/milian/.debug/usr/lib/ld-2.30.so/
> f6ca5853dae87d9f0503a9ef230f6d1fa15a832d/elf: ELF 64-bit LSB shared 
> object,
> x86-64, version 1 (SYSV), statically linked,
> BuildID[sha1]=f6ca5853dae87d9f0503a9ef230f6d1fa15a832d, not stripped
> ```
> 
> I'm afraid to say that I currently don't have the time required to be 
> of more
> help in debugging this issue in general.
> 
> Good luck!

  reply index

Thread overview: 67+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <157597d74ff17f781d9de7e7e3defd13@ut.ac.ir>
2020-03-22 20:24 ` ahmadkhorrami
2020-03-23  0:34   ` Steven Rostedt
     [not found]     ` <21b3df4080709f193d62b159887e2a83@ut.ac.ir>
2020-03-23  8:49       ` Jiri Olsa
2020-03-23 10:03         ` ahmadkhorrami
2020-03-25 15:18           ` ahmadkhorrami
2020-03-25 15:46             ` Jiri Olsa
2020-03-25 18:54               ` ahmadkhorrami
2020-03-25 18:58               ` Arnaldo Carvalho de Melo
2020-03-25 19:10                 ` ahmadkhorrami
2020-03-25 19:28                   ` Arnaldo Carvalho de Melo
2020-03-25 20:01                     ` ahmadkhorrami
2020-03-25 20:39                       ` Jiri Olsa
2020-03-25 21:02                         ` Jiri Olsa
2020-03-25 21:09                           ` Steven Rostedt
2020-03-25 21:37                             ` ahmadkhorrami
2020-03-25 21:46                               ` Jiri Olsa
2020-03-25 22:21                                 ` ahmadkhorrami
2020-03-25 23:09                                   ` ahmadkhorrami
2020-03-26  9:59                                     ` Jiri Olsa
2020-03-26 13:20                                       ` ahmadkhorrami
2020-03-26 15:39                                         ` Jiri Olsa
2020-03-26 18:19                                           ` ahmadkhorrami
2020-03-26 18:21                                             ` ahmadkhorrami
2020-03-27  9:20                                             ` Jiri Olsa
2020-03-27 10:59                                               ` ahmadkhorrami
2020-03-27 11:04                                                 ` ahmadkhorrami
2020-03-27 12:10                                                   ` Milian Wolff
2020-03-27 12:58                                                     ` ahmadkhorrami [this message]
2020-03-27 13:25                                                       ` Milian Wolff
2020-03-27 13:33                                                         ` ahmadkhorrami
2020-03-27 18:43                                                   ` ahmadkhorrami
2020-03-27 22:37                                                     ` Jiri Olsa
2020-03-27 23:12                                                       ` ahmadkhorrami
2020-03-28 23:34                                                         ` Jiri Olsa
2020-03-29  0:43                                                           ` ahmadkhorrami
2020-03-29  1:16                                                             ` ahmadkhorrami
2020-03-29 11:19                                                               ` Jiri Olsa
2020-03-29 11:52                                                                 ` ahmadkhorrami
2020-03-29 12:08                                                                   ` Jiri Olsa
2020-03-29 12:39                                                                     ` ahmadkhorrami
2020-03-29 13:50                                                                       ` Milian Wolff
2020-03-29 14:23                                                                         ` ahmadkhorrami
2020-03-29 19:20                                                                         ` Jiri Olsa
2020-03-30  6:09                                                                           ` Milian Wolff
2020-03-30 13:07                                                                             ` Jiri Olsa
2020-03-30 13:49                                                                               ` ahmadkhorrami
2020-03-30 19:05                                                                                 ` ahmadkhorrami
2020-03-30 21:05                                                                                   ` debuginfod-based dwarf downloading, was " Frank Ch. Eigler
2020-03-31  9:26                                                                                     ` Jiri Olsa
2020-03-31 14:00                                                                                       ` Frank Ch. Eigler
2020-03-31  4:43                                                                                   ` ahmadkhorrami
2020-03-31  9:30                                                                                     ` Jiri Olsa
2020-03-31 11:53                                                                                       ` ahmadkhorrami
2020-03-31 12:43                                                                                   ` ahmadkhorrami
2020-03-31 13:20                                                                                     ` Jiri Olsa
2020-03-31 13:39                                                                                       ` ahmadkhorrami
2020-03-31 14:44                                                                                         ` Milian Wolff
2020-03-31 15:02                                                                                           ` ahmadkhorrami
2020-03-31 15:05                                                                                             ` ahmadkhorrami
2020-03-31 15:29                                                                                             ` Milian Wolff
2020-03-31 16:10                                                                                               ` Arnaldo Carvalho de Melo
2020-03-31 19:20                                                                                                 ` ahmadkhorrami
2020-03-31 19:17                                                                                               ` ahmadkhorrami
2020-03-31 20:57                                                                                               ` ahmadkhorrami
2020-04-04  1:01                                                                                                 ` ahmadkhorrami
2020-04-11 16:42                                                                                                   ` ahmadkhorrami
2020-04-11 21:04                                                                                                     ` ahmadkhorrami

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