Looping in chromium//src/base/OWNERS as i am unable to find any recent changes in the stack trace.

@danakj, can you please assign this accordingly ?

The stack trace is short. Someone called operator= on a null CallbackBack?

ClusterFuzz has detected this issue as fixed in range 34515:34516.

Detailed report: https://cluster-fuzz.appspot.com/testcase?key=5892231807893504

Fuzzer: mbarbella_js_mutation_layout
Job Type: linux_asan_chrome_v8
Platform Id: linux

Crash Type: UNKNOWN
Crash Address: 0x000000000008
Crash State:
  scoped_refptr<base::internal::BindStateBase>::operator=
  scoped_refptr<base::internal::BindStateBase>::operator=
  base::internal::CallbackBase::operator=
  
Regressed: V8: r34503:34512
Fixed: V8: r34515:34516

Unminimized Testcase: https://cluster-fuzz.appspot.com/download/AMIfv94p2_ov-Sbxssd5ZRkez_Y-98UMLQ3XcczBylY-wQ0CLNvhRu7srfiReWXs_rwsWfYWSASL64hkfr-dgIM8otWAb11IrcuDsJSmWwu1XF15kk0fDuAeIAgNUHyTHr-5-cONQjM91WW8qAhwG_y4GR4T0p4Y7nK6L1uG8I0DGQifgqld4pQ


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.

Looks like this issue is not longer reproducible, closing the issue for now. Please feel free to raise a new issue or reopen if it reappears. 

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