kojii @ could you please look into this. thanks

drott@, is this the primaryFont nullptr problem?

I don't think we have that on Linux so much, that's mostly Windows. I can try to take a look. Perhaps something to do with the "font-style: italic; writing-mode: vertical-lr;" from the test case.

> Job Type: linux_asan_chrome_v8_arm

mmohammad@, is this reproducible on non-arm?

ClusterFuzz has detected this issue as fixed in range 411868:411875.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=5672337414553600

Fuzzer: ochang_domfuzzer
Job Type: linux_asan_chrome_v8_arm
Platform Id: linux

Crash Type: UNKNOWN READ
Crash Address: 0x000000c8
Crash State:
  blink::SimpleFontData::isTextOrientationFallbackOf
  blink::ShapeResult::fallbackFonts
  blink::CachingWordShaper::width
  
Regressed: https://cluster-fuzz.appspot.com/revisions?job=linux_asan_chrome_v8_arm&range=411257:411277
Fixed: https://cluster-fuzz.appspot.com/revisions?job=linux_asan_chrome_v8_arm&range=411868:411875

Minimized Testcase (1.00 Kb): https://cluster-fuzz.appspot.com/download/AMIfv9433cRhE_sxuqIsUMdOsTHP4udvzNzkCNrJckGEHog7Eo47qL0WsBm3Ye_IrX9_B2d_xNsCJCBuvYgt4awgejla_d542oXxW_9tNCsOtEr-qr3yj4EN2PBzT0Rkzp7fQB_-jtLaPejAyiJfwLfuIHzgdM-hbw?testcase_id=5672337414553600

See https://dev.chromium.org/Home/chromium-security/bugs/reproducing-clusterfuzz-bugs for more information.

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

ClusterFuzz testcase is verified as fixed, closing issue.

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