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Issue metadata

Status: WontFix
Owner:
Closed: Apr 2018
Cc:
Components:
EstimatedDays: ----
NextAction: ----
OS: Linux , Windows , Mac
Pri: 1
Type: Bug



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Timeout in pdf_codec_jbig2_fuzzer

Project Member Reported by ClusterFuzz, Apr 29 2018

Issue description

Detailed report: https://clusterfuzz.com/testcase?key=5021905434968064

Fuzzer: libFuzzer_pdf_codec_jbig2_fuzzer
Job Type: libfuzzer_chrome_asan
Platform Id: linux

Crash Type: Timeout (exceeds 25 secs)
Crash Address: 
Crash State:
  pdf_codec_jbig2_fuzzer
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_asan&range=421372:421456

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=5021905434968064

Issue filed automatically.

See https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/reference.md for more information.
 
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Comment 1 by ClusterFuzz, Apr 29 2018

Components: Internals>Plugins>PDF
Labels: Test-Predator-Auto-Components
Automatically applying components based on crash stacktrace and information from OWNERS files.

If this is incorrect, please apply the Test-Predator-Wrong-Components label.
Project Member

Comment 2 by ClusterFuzz, Apr 29 2018

Cc: dsinclair@chromium.org jam@chromium.org brucedaw...@chromium.org
Labels: ClusterFuzz-Auto-CC
Automatically adding ccs based on OWNERS file / target commit history.

If this is incorrect, please add ClusterFuzz-Wrong label.
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Comment 3 by ClusterFuzz, Apr 29 2018

Cc: tsepez@chromium.org thestig@chromium.org
Labels: Test-Predator-Auto-CC
Automatically adding ccs based on suspected regression changelists:

Simplify FPDF_RenderPage(). by thestig@chromium.org - https://pdfium.googlesource.com/pdfium/+/84144e88da8d2bbd03ba9f8608d5603a18b4d480

Remove unused cpdf_generalstatedata.h by tsepez@chromium.org - https://pdfium.googlesource.com/pdfium/+/341422fe3beb1210b28727d08e1e6f9a6fa4b030

Watch destruction of widgets around OnAAction() method. by tsepez@chromium.org - https://pdfium.googlesource.com/pdfium/+/f8074cefb2f8d947fa83d151bcbe080b485d6e6b

If this is incorrect, please let us know why and apply the Test-Predator-Wrong-CLs label.
Owner: rharrison@chromium.org
Status: Assigned (was: Untriaged)
rharrison@ can you take a look? More fuzzer image decoder timeout fun.
Labels: ClusterFuzz-Ignore
Status: WontFix (was: Assigned)
Looking at a profiling run, the execution is being dominated by a single pass of fetching pixels and performing a calculation based on them. Given that the input image/canvas size is specified as something like ~32k x 10k, this means there is just a lot of operations that need to be run.

Given enough time the fuzzer completes without issue. I don't think there is much for us to do, unless we have an expert on JBig2 that might know how to avoid this step.
Project Member

Comment 6 by ClusterFuzz, May 7 2018

Labels: Needs-Feedback
ClusterFuzz testcase 5021905434968064 is still reproducing on tip-of-tree build (trunk).

If this testcase was not reproducible locally or unworkable, ignore this notification and we will file another bug soon with hopefully a better and workable testcase.

Otherwise, if this is not intended to be fixed (e.g. this is an intentional crash), please add ClusterFuzz-Ignore label to prevent future bug filing with similar crash stacktrace.
Labels: -Needs-Feedback
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Comment 8 by ClusterFuzz, Jun 20 2018

Labels: OS-Mac
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Comment 9 by ClusterFuzz, Oct 9

Labels: OS-Windows
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Comment 10 by ClusterFuzz, Dec 1

Labels: -Reproducible Unreproducible
ClusterFuzz testcase 5021905434968064 appears to be flaky, updating reproducibility label.

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