Issue 702485 link

Starred by 1 user

Issue metadata

Status:	Fixed
Owner:	csharrison@chromium.org
Closed:	Apr 2017
Cc:	kcc@chromium.org █ tanin@chromium.org jsb...@chromium.org mmoroz@chromium.org mbarbe...@chromium.org och...@chromium.org █ aizatsky@chromium.org
EstimatedDays:	----
NextAction:	----
OS:	----
Pri:	1
Type:	Bug

Blocked on:
issue 701825
issue 703104

Blocking:
issue 539572

AFL size regression

Project Member Reported by infe...@chromium.org, Mar 17 2017

Issue description

  afl-linux-release-457505.zip	8.07 GB	application/zip	Multi-Regional	3/16/17, 1:05 PM	Public link	
 
  afl-linux-release-457532.zip	19.49 GB	application/zip	Multi-Regional	3/16/17, 3:03 PM	Public link	
 
Max, can you please hunt the regresse and revert.

Comment 1 by infe...@chromium.org, Mar 17 2017

Also, broke clusterfuzz, see vi/clusterfuzz.

Comment 2 by infe...@chromium.org, Mar 17 2017

Cc: csharrison@chromium.org kcc@chromium.org

https://clusterfuzz.com/revisions?job=linux_asan_chrome_mp&range=457505:457532
https://chromium.googlesource.com/chromium/src/+log/23fea388a2229a0a72123e75d63cb37e9712eee1..f198985c0ffa2f7c4d75e001b14d2ac8c9300ae9?pretty=fuller

https://chromium.googlesource.com/chromium/src/+/bb69cdf76b25cee534e6b84a5c55f4453ee3c828 is probable. But wow, such a huge size jump.

Comment 3 by infe...@chromium.org, Mar 17 2017

+template("blink_text_codec_fuzzer") {
+  forward_variables_from(invoker, "*")
+  config(target_name + "_config") {
+    defines = [ "$target_name" ]
+  }
+  name = target_name
+  fuzzer_test("blink_text_codec_" + name + "_fuzzer") {
+    sources = [
+      "TextCodecFuzzer.cpp",
+    ]
+    deps = [
+      ":blink_fuzzer_test_support",
+      ":platform",
+    ]
+    additional_configs = [ ":" + name + "_config" ]
+    seed_corpus = "text_codec_fuzzer_seed_corpus"
+  }
+}

Why different fuzz target for every codec, and repeated seed corpus. Reverting.

Comment 4 by infe...@chromium.org, Mar 17 2017

Cc: -csharrison@chromium.org mmoroz@chromium.org
Owner: csharrison@chromium.org

csharrison@, can you please revert asap. We need to discuss this approach before we reland, but currently breaking ClusterFuzz.

Comment 5 by csharrison@chromium.org, Mar 17 2017

Sorry, I am traveling today and heading to airport soon. Just noticed you made a revert, let's move forward with that one. 

Apologies for breaking things. We were trying to get good coverage on all the text codecs which have different behavior (i.e. some text is not interesting on all fuzzers).

Comment 6 by csharrison@chromium.org, Mar 17 2017

+mmoroz FYI

Comment 7 by mmoroz@chromium.org, Mar 17 2017

Blocking: 701825

This was proposed by aizatsky@ and myself to split the target. There is no fault of csharrison@ :)

I still believe that we should split the targets, but looks like we have to resolve issue 701825 first.

Comment 8 by mmoroz@chromium.org, Mar 17 2017

Seed corpus takes only 70KB when archived. When multiplied by 42, it's smaller than 3MB.

AFL builds are crazy large. In issue 701825 we note that unpacked AFL build takes 27.8 GB. But with these 42 new targets, it becomes 68.1 GB when unpacked (+40 GB).

For libFuzzer, unpacked build size jumps from 20.0 GB to 49.6 GB (+30 GB).

Project Member

Comment 9 by bugdroid1@chromium.org, Mar 17 2017

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/9b20314165b04b503108c1a8a6aa12d8ead7bec9

commit 9b20314165b04b503108c1a8a6aa12d8ead7bec9
Author: inferno <inferno@chromium.org>
Date: Fri Mar 17 09:41:43 2017

Revert of Fuzzer for TextCodecs (patchset #8 id:140001 of https://codereview.chromium.org/2731643002/ )

Reason for revert:
Huge size regression on fuzzer archives.

BUG= 702485 

Original issue's description:
> Fuzzer for TextCodecs
>
> Fuzzer originally written by jsbell here:
> https://codereview.chromium.org/2546233002
>
> This introduces a libFuzzer-based fuzzer template (which can be run locally
> or via ClusterFuzz) for the WTF::TextCodec implementations. It
> introduces a new target for every text codec.
>
> Fuzzer docs: https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/getting_started.md
>
> This patch also includes a generated fuzzer corpus.
>
> Review-Url: https://codereview.chromium.org/2731643002
> Cr-Commit-Position: refs/heads/master@{#457512}
> Committed: https://chromium.googlesource.com/chromium/src/+/bb69cdf76b25cee534e6b84a5c55f4453ee3c828

TBR=mmoroz@chromium.org,jsbell@chromium.org,aizatsky@google.com,haraken@chromium.org,csharrison@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review-Url: https://codereview.chromium.org/2755083002
Cr-Commit-Position: refs/heads/master@{#457727}

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Comment 10 by mmoroz@chromium.org, Mar 20 2017

Blockedon: 703104

Comment 11 by csharrison@chromium.org, Mar 20 2017

Cc: jsb...@chromium.org

Did the revert fix the issue? Is there a way to land these targets without breaking the infra?

If 42 targets is unreasonable we should probably just land a subset.

Comment 12 by mmoroz@chromium.org, Mar 20 2017

Blockedon: 701825
Blocking: -701825

Yes, the revert fixed the issue, though we also had to restart the bots.

I think it would be fine to proceed with 1-2 most important encodings for now (at least UTF-8, I guess?). All the rest can be landed only when address issue 701825 :(

Comment 13 by csharrison@chromium.org, Mar 20 2017

Great, thanks for the quick update. I'll upload a new patch only adding a couple new ones. Do you think we can keep the entire seed corpus as-is?

Comment 14 by mmoroz@chromium.org, Mar 20 2017

Yes, the corpus is very small comparing to the binaries: 70KB for seed_corpus_*.zip vs 700MB of a single fuzzer binary.

Project Member

Comment 15 by bugdroid1@chromium.org, Mar 21 2017

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/93ceca962e764693960dfcb67c873b3724a8d41f

commit 93ceca962e764693960dfcb67c873b3724a8d41f
Author: csharrison <csharrison@chromium.org>
Date: Tue Mar 21 12:27:58 2017

Reland "Fuzzer for TextCodecs"

This is a reland with all fuzzers removed except for utf8 and
windows-1252, so as not to regress AFL sizes / bring down clusterfuzz.
See crbug.com/701825.

Original review:
https://codereview.chromium.org/2731643002/

Reverted:
https://codereview.chromium.org/2755083002/

Original description:
Fuzzer originally written by jsbell here:
https://codereview.chromium.org/2546233002

This introduces a libFuzzer-based fuzzer template (which can be run locally
or via ClusterFuzz) for the WTF::TextCodec implementations. It
introduces a new target for every text codec.

Fuzzer docs: https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/getting_started.md

This patch also includes a generated fuzzer corpus.

BUG= 702485 

Review-Url: https://codereview.chromium.org/2762763002
Cr-Commit-Position: refs/heads/master@{#458380}

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Comment 16 by csharrison@chromium.org, Apr 17 2017

Status: Fixed (was: Assigned)

►

Issue 702485 link

Issue metadata

AFL size regression

Issue description

Comment 1 by infe...@chromium.org, Mar 17 2017

Comment 1 Deleted

Comment 2 by infe...@chromium.org, Mar 17 2017

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Comment 3 by infe...@chromium.org, Mar 17 2017

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Comment 4 by infe...@chromium.org, Mar 17 2017

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Comment 5 by csharrison@chromium.org, Mar 17 2017

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Comment 6 by csharrison@chromium.org, Mar 17 2017

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Comment 7 by mmoroz@chromium.org, Mar 17 2017

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Comment 8 by mmoroz@chromium.org, Mar 17 2017

Comment 8 Deleted

Comment 9 by bugdroid1@chromium.org, Mar 17 2017

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Comment 10 by mmoroz@chromium.org, Mar 20 2017

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Comment 11 by csharrison@chromium.org, Mar 20 2017

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Comment 12 by mmoroz@chromium.org, Mar 20 2017

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Comment 13 by csharrison@chromium.org, Mar 20 2017

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Comment 14 by mmoroz@chromium.org, Mar 20 2017

Comment 14 Deleted

Comment 15 by bugdroid1@chromium.org, Mar 21 2017

Comment 15 Deleted

Comment 16 by csharrison@chromium.org, Apr 17 2017

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