linux-kernel - Re: [PATCH 0/4] perf maps/symbols: Various assert fixes

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Date: Wed, 8 May 2024 08:52:59 +0100
From: James Clark <james.clark@....com>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: linux-perf-users@...r.kernel.org, atrajeev@...ux.vnet.ibm.com,
 irogers@...gle.com, Peter Zijlstra <peterz@...radead.org>,
 Ingo Molnar <mingo@...hat.com>, Namhyung Kim <namhyung@...nel.org>,
 Mark Rutland <mark.rutland@....com>,
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
 Jiri Olsa <jolsa@...nel.org>, Adrian Hunter <adrian.hunter@...el.com>,
 "Liang, Kan" <kan.liang@...ux.intel.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/4] perf maps/symbols: Various assert fixes



On 07/05/2024 16:12, Arnaldo Carvalho de Melo wrote:
> On Tue, May 07, 2024 at 12:11:42PM -0300, Arnaldo Carvalho de Melo wrote:
>> On Tue, May 07, 2024 at 03:12:04PM +0100, James Clark wrote:
>>> A few different asserts are hit when running perf report on minimal
>>> Arm systems when kcore is used, or the .debug/ info can't be loaded or
>>> /boot isn't mounted etc.
>>>
>>> These result in some less common paths being hit for resolving symbols
>>> and things are done in an order that breaks some assumptions. I'm not
>>> sure if we could do something to make the tests pick this up, but maybe
>>> not easily if it would involve mocking the filesystem or even a specific
>>> kernel. I tried a few different variations of --kcore and --vmlinux
>>> arguments but ultimately I could only reproduce these issues by running
>>> on specific kernels and root filesystems.
>>
>> Please consider adding Fixes tags so that we can help the work of
>> backporters/stable?
> 
> Sorry, you already did it for the last two patches in the series, so you
> couldn't find easily what were the csets that introduced the problems in
> the first two patches?
> 
> - Arnaldo

1,3 and 4 are all fixes and have tags. 2 is just a tidyup so I didn't
add the tag. I probably should have explained that in the cover letter.

>>  
>>> James Clark (4):
>>>   perf symbols: Remove map from list before updating addresses
>>>   perf maps: Re-use __maps__free_maps_by_name()
>>>   perf symbols: Update kcore map before merging in remaining symbols
>>>   perf symbols: Fix ownership of string in dso__load_vmlinux()
>>>
>>>  tools/perf/util/maps.c   | 14 ++++++------
>>>  tools/perf/util/symbol.c | 49 ++++++++++++++++++++++++----------------
>>>  2 files changed, 36 insertions(+), 27 deletions(-)
>>>
>>> -- 
>>> 2.34.1
>