From: ahmadkhorrami <ahmadkhorrami@ut.ac.ir>
To: Jiri Olsa <jolsa@redhat.com>
Cc: 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>,
Milian Wolff <milian.wolff@kdab.com>,
Namhyung Kim <namhyung@kernel.org>,
Changbin Du <changbin.du@intel.com>,
Andi Kleen <ak@linux.intel.com>
Subject: Re: Wrong Perf Backtraces
Date: Sat, 28 Mar 2020 03:42:53 +0430 [thread overview]
Message-ID: <57b9e24200019a41bd465e2d78c09e29@ut.ac.ir> (raw)
In-Reply-To: <20200327223743.GA2155755@krava>
Hi,
Thanks. If you suggest the potentially bogus locations of the source
code, I will give a try.
Regards.
On 2020-03-28 03:07, Jiri Olsa wrote:
> On Fri, Mar 27, 2020 at 11:13:27PM +0430, ahmadkhorrami wrote:
>
>> Hi,
>> I revised the code. Hopefully, it works. Could you check it with your
>> own
>> outputs? It is valuable for me to know if your output contains wrong
>> backtraces or not. Here is the link:
>> https://gofile.io/?c=rz2kGc
>
> will check, so far caught one.. might be same case:
>
> evince 2168454 1549196.055094: 43831 cycles:u:
> ffffffffaec012f0 [unknown] ([unknown])
> 7f0dd44776b6 __mmap64+0x26 (inlined)
> 7f0dd44776b6 __mmap64+0x26 (inlined)
>
> will try to investigate next week
>
> thanks,
> jirka
>
> Regards.
>
> On 2020-03-27 15:34, 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'.
>
> Regards.
>
> On 2020-03-27 15:29, ahmadkhorrami wrote:
>
> Hi,
> Thanks! Could you tell me what should be changed in order to make
> the code runnable on your system, if it is possible?
> Regards.
>
> On 2020-03-27 13:50, Jiri Olsa wrote:
>
> On Thu, Mar 26, 2020 at 10:49:12PM +0430, ahmadkhorrami wrote:
>
> Hi,
> Here is the link for the python script:
> https://gofile.io/?c=1ZSLwe
> It is written in python-3 and takes the perf script output as input.
> It looks for consecutive repeated backtrace lines and checks if the
> function
> in these lines calls itself at the offset in the line (i.e., checks if
> recursion is possible). If not possible it reports an error. Could
> you check
> to see if any error is detected in your outputs, please?
> I'm getting tons of following output:
>
> /usr/lib/x86_64-linux-gnu/libgtk-3.so.0.2200.30: No such file or
> directory.
> No symbol table is loaded. Use the "file" command.
> 7ffff71b9bc1 gtk_css_node_invalidate_timestamp+0x31
> (/usr/lib/x86_64-linux-gnu/libgtk-3.so.0.2200.30)
>
> I assume it's because I have all the dso binaries stored
> under .biuldid path, while you check the output name
>
> jirka
>
> Regards.
> On 2020-03-26 20:09, Jiri Olsa wrote:
>
> On Thu, Mar 26, 2020 at 05:50:27PM +0430, ahmadkhorrami wrote:
>
> Hi,
> First of all, many thanks for your time. Did you say that the first
> file has
> problems?
>
> The first file (http://gofile.io/?c=qk6oXv) has repeated gmallocn()s
> while
> the second (https://gofile.io/?c=oGxgSM) also has problems with
> unmatched
> (not necessarily repeated) function calls. I am not sure if the
> kernel for
> the second one is 5.4.7 or the generic Ubuntu kernel. But the first
> one is
> certainly 5.4.7. Just to be clear, there were many instances of these
> unmatched <caller, callees>.
> I can se all the files, but I just can't see the issue yet
> but it's probably because of issues with perf archive..
>
> let's see if somebody else can chime in
>
> I have a simple python script that checks for this situation. It
> disassembles functions using GDB and checks the (directly called)
> target of
> each caller. I will put some comments in the script and upload it.
> Could you
> check to see if the python script detects any mismatches in your
> backtraces?
> It takes the perf script output file as input. I will upload the
> script in
> an hour.
> ok
>
> jirka
next prev parent reply other threads:[~2020-03-27 23:13 UTC|newest]
Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <157597d74ff17f781d9de7e7e3defd13@ut.ac.ir>
2020-03-22 20:24 ` Wrong Perf Backtraces 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
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 [this message]
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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