New issue
Advanced search Search tips
Note: Color blocks (like or ) mean that a user may not be available. Tooltip shows the reason.

Issue 849075 link

Starred by 1 user

Issue metadata

Status: Verified
Owner:
Closed: Jun 2018
Cc:
Components:
EstimatedDays: ----
NextAction: ----
OS: Linux
Pri: 3
Type: Bug



Sign in to add a comment

clusterfuzz GrAAConvexTessellator::extractFromPath asserts

Project Member Reported by ClusterFuzz, Jun 3 2018

Issue description

Detailed report: https://clusterfuzz.com/testcase?key=6754657255555072

Fuzzer: libFuzzer_paint_op_buffer_fuzzer
Job Type: libfuzzer_chrome_asan_debug
Platform Id: linux

Crash Type: Abrt
Crash Address: 0x053900005460
Crash State:
  sk_abort_no_print
  GrAAConvexTessellator::extractFromPath
  GrAAConvexTessellator::extractFromPath
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_asan_debug&range=555638:555648

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=6754657255555072

Issue filed automatically.

See https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/reference.md for more information.
 
Project Member

Comment 1 by ClusterFuzz, Jun 3 2018

Components: Internals>Skia
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, Jun 3 2018

Cc: enne@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.

Comment 3 by enne@chromium.org, Jun 4 2018

Cc: fmalita@chromium.org bsalomon@chromium.org
Labels: -Pri-1 ClusterFuzz-Ignore Pri-3
Owner: robertphillips@chromium.org
Status: Assigned (was: Untriaged)
Summary: clusterfuzz GrAAConvexTessellator::extractFromPath asserts (was: Abrt in sk_abort_no_print)
This repros for me easily in Linux ToT.  It's just hitting some asserts in GrAAConvexTessellator, such as https://skia.googlesource.com/skia/+/fd6a52cc84364208f65f1ee52644192d6855ab0e/src/gpu/ops/GrAAConvexTessellator.cpp#419.

It looks like if I turn off those asserts, then everything works as normal, so this does not seem to be a security issue.

robertphillips, fmalita: Is this something you want to look at? It seems like maybe a corner failure case of the tessellator.  The fuzzer repros it easily.  If this is not something y'all want to fix, then feel free to close this bug.
Project Member

Comment 4 by ClusterFuzz, Jun 19 2018

ClusterFuzz has detected this issue as fixed in range 568139:568162.

Detailed report: https://clusterfuzz.com/testcase?key=6754657255555072

Fuzzer: libFuzzer_paint_op_buffer_fuzzer
Job Type: libfuzzer_chrome_asan_debug
Platform Id: linux

Crash Type: Abrt
Crash Address: 0x053900005460
Crash State:
  sk_abort_no_print
  GrAAConvexTessellator::extractFromPath
  GrAAConvexTessellator::extractFromPath
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_asan_debug&range=555638:555648
Fixed: https://clusterfuzz.com/revisions?job=libfuzzer_chrome_asan_debug&range=568139:568162

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=6754657255555072

See https://chromium.googlesource.com/chromium/src/+/master/testing/libfuzzer/reference.md for more information.

If you suspect that the result above is incorrect, try re-doing that job on the test case report page.
Project Member

Comment 5 by ClusterFuzz, Jun 19 2018

Labels: ClusterFuzz-Verified
Status: Verified (was: Assigned)
ClusterFuzz testcase 6754657255555072 is verified as fixed, so closing issue as verified.

If this is incorrect, please add ClusterFuzz-Wrong label and re-open the issue.

Sign in to add a comment