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> Predator was unable to identify any culprit changelists for this test case. 

> Unable to find actual suspect through code search and also observing no possible CL under regression range, hence requesting someone from v8 team to look in to it.

Thanks!

This is a WebAudio problem.  oac.suspend() is called with a time value of 1.125899906842624e+15.  Internally, we convert this to a frame number as a size_t (64-bit).  The sample rate is 16384, so the frame number is 18446744073709551616, but that doesn't fit in a size_t.  Hence the overflow.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/fad75adf0a02ff1173f2579c673985d3ca368586

commit fad75adf0a02ff1173f2579c673985d3ca368586
Author: Raymond Toy <rtoy@chromium.org>
Date: Fri May 18 00:02:30 2018

Handle huge suspend times carefully for offline context

Instead of computing the number of frames from the time immediately,
first verify that the specified time is not past the end of the total
render duration.  If the verification passes, the conversion from time
to frame is safe because the offline context render length is an
unsigned long (32-bits).

Bug:  843849 
Change-Id: I94fd41aa9b90d758b4b3cf81a539bd69e213c376
Reviewed-on: https://chromium-review.googlesource.com/1064819
Commit-Queue: Raymond Toy <rtoy@chromium.org>
Reviewed-by: Hongchan Choi <hongchan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#559742}
[modify] https://crrev.com/fad75adf0a02ff1173f2579c673985d3ca368586/third_party/blink/renderer/modules/webaudio/offline_audio_context.cc

ClusterFuzz has detected this issue as fixed in range 559741:559743.

Detailed report: https://clusterfuzz.com/testcase?key=4748834346106880

Fuzzer: inferno_twister
Job Type: linux_ubsan_chrome
Platform Id: linux

Crash Type: Float-cast-overflow
Crash Address: 
Crash State:
  blink::OfflineAudioContext::suspendContext
  suspendMethod
  blink::V8OfflineAudioContext::suspendMethodCallback
  
Sanitizer: undefined (UBSAN)

Regressed: https://clusterfuzz.com/revisions?job=linux_ubsan_chrome&range=552707:552711
Fixed: https://clusterfuzz.com/revisions?job=linux_ubsan_chrome&range=559741:559743

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=4748834346106880

Additional requirements: Requires HTTP

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ClusterFuzz testcase 4748834346106880 is verified as fixed, so closing issue as verified.

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