Assigning to the concern owner from find it results --
The result is a list of CLs that change the crashed files. 

Author: jinsukkim
Project: chromium
Changelist: https://chromium.googlesource.com/chromium/src/+/79df88ae0437499f21dd82976ca24a0c6f2d11c7
Time: Wed Jan 04 06:26:15 2017
Lines 5160 of file web_contents_impl.cc which potentially caused crash are changed in this cl (frame #3, "content::WebContentsImpl::SetEncoding").
Minimum distance from crash line to modified line: 0. (file: web_contents_impl.cc, crashed on: 5160, modified: 5160).

@jinsukkim -- Could you please look into the issue, kindly re-assign if this is not related to your changes.
Thank You.

Doesn't look related to SiteIsolation.  Guessing it might be TextEncoding.

ClusterFuzz has detected this issue as fixed in range 441524:441984.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=4965275184398336

Fuzzer: inferno_layout_test_unmodified
Job Type: mac_asan_chrome
Platform Id: mac

Crash Type: UNKNOWN READ
Crash Address: 0x000000000000
Crash State:
  /usr/lib/libc++.1.dylib
  bool IPC::MessageT<FrameHostMsg_UpdateEncoding_Meta, std::__1::tuple<std::__1::b
  content::RenderFrameHostImpl::OnMessageReceived
  
Sanitizer: address (ASAN)

Regressed: https://cluster-fuzz.appspot.com/revisions?job=mac_asan_chrome&range=441240:441358
Fixed: https://cluster-fuzz.appspot.com/revisions?job=mac_asan_chrome&range=441524:441984

Minimized Testcase (0.02 Kb):
Download: https://cluster-fuzz.appspot.com/download/AMIfv95awL6dfIuTJiU1i8Zz5E6ZYlYH3JR-QU9jDc5wgkFfbFBmNZzfwTKPxDJevjC9nqvm_-fVDfMSv3VBL7SPmU7W6Lz_xp_Ztpl8s1kUgb388vtpqMhIMvdgNbD46jNWEJysp1HvjDZkV6ls4Qu3UAmv5D5XZ1x_OBODb6AUf8cBeVfazXQ5pnNbOkyBCdaM_9GhhplROjhIC8ja5EwjV00jn2pSiRve7JgBY57dJdL5dc8vqcKMGAL6opB9AAMvwKxhJ5aM8WHiC2s91LQmxkwGpr8dDEgNjwTwRHfaLH_8Q1oPm5Td0qY00De5osM-Ro1a9gUxoxduAydX4o2fw1iT1TvimdqAGYP_XGVDH2h5jfCbpeCl72fKUuRtCupPO4RQQyiF_fK7lk_uDvFQPXeahS0t9A?testcase_id=4965275184398336
<meta charset=HZ-GB-2312>


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.