Through code search on render_widget_host_view_aura.cc, suspected CL is 
https://chromium.googlesource.com/chromium/src/+/0b1041f656728be7aba9923c9ac21fd4448b0c15
ekaramad@. could you please take a look?

I will take a look. The DCHECK was about to be removed anyway. I will investigate why the range values are incorrect however.

I cannot reproduce the crash following the steps. I downloaded the build which comes with the report. I will keep poking at it.

I should also add that the CL mentioned above should not be a cause of this. These values are reported from the renderer side so they issue could be at the origin of the data.

Adding dglazkov@ for input since he recently had a CL on updating text selection info. The crash is due to invalid text selection values which directly come from the renderer side.

dglazkov@: Can you please take a look? also any suggestions on repro steps are much appreciated. I could not get a crash by following the steps in the docs.

Sure thing. Will take a look.

ClusterFuzz has detected this issue as fixed in range 412915:412948.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=6661115457306624

Fuzzer: inferno_layout_test_unmodified
Job Type: linux_debug_content_shell_drt
Platform Id: linux

Crash Type: CHECK failure
Crash Address: 
Crash State:
  pos + n <= text_selection->text.length(). The text can not fully cover range in 
  content::RenderWidgetHostViewAura::OnTextSelectionChanged
  content::TextInputManager::SelectionChanged
  
Regressed: https://cluster-fuzz.appspot.com/revisions?job=linux_debug_content_shell_drt&range=268656:269696
Fixed: https://cluster-fuzz.appspot.com/revisions?job=linux_debug_content_shell_drt&range=412915:412948

Minimized Testcase (0.15 Kb):
Download: https://cluster-fuzz.appspot.com/download/AMIfv97H-S8znJmA1lN2nhNdI29rxDeGJ49sK3zpB-GAx4YIQjZSw72bBKGn3giP28cQR9NYtWA_t-9GomnKPU0CdGHJSmGcjED81qb8pFE1kQ3srlhKRcF8mGV_Yv9U1YZpewqv6ZlRlKcf0TAWUFL-jtSBBg-SZg?testcase_id=6661115457306624
<div contenteditable="true">
<table id="table">
<script>
var sel = window.getSelection();
var parent = table.parentNode;
sel.collapse(parent);
</script>


Additional requirements: Requires Gestures

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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Well dang, I was just going to go look at it :)

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