based on Findit results, assigning to yosin@, could you please check the issue.

The result is a list of CLs that change the crashed files. 

Author: yosin
Project: chromium
Changelist: https://chromium.googlesource.com/chromium/src/+/d892f9592860691ae9a782c12260c94ed6bd1a63
Time: Tue Feb 14 15:56:00 2017
Lines 233-247 of file FrameSelection.cpp which potentially caused crash are changed in this cl (frame #3, "blink::FrameSelection::setSelection").
Minimum distance from crash line to modified line: 0. (file: FrameSelection.cpp, crashed on: 233, modified: 233).

Lower to Pri-2, since the script attempt to execute "selectAll" command for detached IFRAME.

ClusterFuzz has detected this issue as fixed in range 455091:455392.

Detailed report: https://clusterfuzz.com/testcase?key=5338142749229056

Fuzzer: ifratric-browserfuzzer-v3
Job Type: linux_asan_chrome_media
Platform Id: linux

Crash Type: UNKNOWN READ
Crash Address: 0x0000000005b0
Crash State:
  blink::Document::updateStyleAndLayoutTreeIgnorePendingStylesheets
  blink::Document::updateStyleAndLayoutIgnorePendingStylesheets
  blink::FrameSelection::setSelection
  
Sanitizer: address (ASAN)

Regressed: https://clusterfuzz.com/revisions?job=linux_asan_chrome_media&range=450347:450401
Fixed: https://clusterfuzz.com/revisions?job=linux_asan_chrome_media&range=455091:455392

Reproducer Testcase: https://clusterfuzz.com/download/AMIfv964HeXM0kVzEy0j4jGl67LbK3ZqZLMDE9xUn0oQ_Jv0tK0pZ-0ae2Rwy1RohNNesHyoTD8gl8OZtp9e7fzBUZSTjPQkmdw5z0OMmwubBDpsW7TcNGwvYkuAY4bg4i5Ix_W4BPF-NMROW-L2kB3nKrtGaJmIF-Ca4YaTzqXj96JPYn0h43NGg04PyyI9Q1XObymX4wJanhHIRSycydvOE26wMRmUmFD3d_Lp2HI71Ei_cZ_FsiqE1jmsjr2bYgqG4-THZO0ABFpALLJFejVoHAMp1ORRaUuL2vxl7HyQ0gdwcgEhoPKPjwXbWgxS6z09XxKGmqRh-d57JC3BVEWggkTkd_eUtE60X8vwhN8vxvzohoqu5bz0OuOXxm8o7mgJpBhvGcMH3ASuv6TvXRl7WQ3u70zB_Q?testcase_id=5338142749229056


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 5338142749229056 is verified as fixed, so closing issue.

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