Example stack trace (from https://luci-milo.appspot.com/buildbot/tryserver.chromium.android/linux_android_rel_ng/397999 / https://luci-logdog.appspot.com/v/?s=chromium%2Fandroid%2Fswarming%2Flogcats%2F38fb673e6e601c11%2F%2B%2Ftombstones_20171003T141929-UTC_06971cd5003b7a77):

base::debug::(anonymous namespace)::DebugBreak()
base::debug::BreakDebugger()+20
logging::LogMessage::~LogMessage()+806
base::CommandLine::ForCurrentProcess()+46
google_util::CommandLineGoogleBaseURL()+36
UIThreadSearchTermsData::GoogleBaseURLValue() const+72
TemplateURLRef::ParseHostAndSearchTermKey(SearchTermsData const&) const+32
TemplateURLRef::ParseIfNecessary(SearchTermsData const&) const+136
TemplateURLRef::HasGoogleBaseURLs(SearchTermsData const&) const+4
TemplateURL::IsGoogleSearchURLWithReplaceableKeyword(SearchTermsData const&) const+16
TemplateURL::ResetKeywordIfNecessary(SearchTermsData const&, bool)+10
TemplateURLService::AddNoNotify(std::__ndk1::unique_ptr<TemplateURL, std::__ndk1::default_delete<TemplateURL> >, bool)+170
TemplateURLService::SetTemplateURLs(std::__ndk1::unique_ptr<std::__ndk1::vector<std::__ndk1::unique_ptr<TemplateURL, std::__ndk1::default_delete<TemplateURL> >, std::__ndk1::allocator<std::__ndk1::unique_ptr<TemplateURL, std::__ndk1::default_delete<TemplateURL> > > >, std::__ndk1::default_delete<std::__ndk1::vector<std::__ndk1::unique_ptr<TemplateURL, std::__ndk1::default_delete<TemplateURL> >, std::__ndk1::allocator<std::__ndk1::unique_ptr<TemplateURL, std::__ndk1::default_delete<TemplateURL> > > > > >)+174
TemplateURLService::OnWebDataServiceRequestDone(int, std::__ndk1::unique_ptr<WDTypedResult, std::__ndk1::default_delete<WDTypedResult> >)+100
WebDataRequestManager::RequestCompletedOnThread(std::__ndk1::unique_ptr<WebDataRequest, std::__ndk1::default_delete<WebDataRequest> >, std::__ndk1::unique_ptr<WDTypedResult, std::__ndk1::default_delete<WDTypedResult> >)+46
void base::internal::FunctorTraits<void (WebDataRequestManager::*)(std::__ndk1::unique_ptr<WebDataRequest, std::__ndk1::default_delete<WebDataRequest> >, std::__ndk1::unique_ptr<WDTypedResult, std::__ndk1::default_delete<WDTypedResult> >), void>::Invoke<scoped_refptr<WebDataRequestManager>, std::__ndk1::unique_ptr<WebDataRequest, std::__ndk1::default_delete<WebDataRequest> >, std::__ndk1::unique_ptr<WDTypedResult, std::__ndk1::default_delete<WDTypedResult> > >(void (WebDataRequestManager::*)(std::__ndk1::unique_ptr<WebDataRequest, std::__ndk1::default_delete<WebDataRequest> >, std::__ndk1::unique_ptr<WDTypedResult, std::__ndk1::default_delete<WDTypedResult> >), scoped_refptr<WebDataRequestManager>&&, std::__ndk1::unique_ptr<WebDataRequest, std::__ndk1::default_delete<WebDataRequest> >&&, std::__ndk1::unique_ptr<WDTypedResult, std::__ndk1::default_delete<WDTypedResult> >&&)+44
void base::internal::InvokeHelper<false, void>::MakeItSo<void (WebDataRequestManager::*)(std::__ndk1::unique_ptr<WebDataRequest, std::__ndk1::default_delete<WebDataRequest> >, std::__ndk1::unique_ptr<WDTypedResult, std::__ndk1::default_delete<WDTypedResult> >), scoped_refptr<WebDataRequestManager>, std::__ndk1::unique_ptr<WebDataRequest, std::__ndk1::default_delete<WebDataRequest> >, std::__ndk1::unique_ptr<WDTypedResult, std::__ndk1::default_delete<WDTypedResult> > >(void (WebDataRequestManager::*&&)(std::__ndk1::unique_ptr<WebDataRequest, std::__ndk1::default_delete<WebDataRequest> >, std::__ndk1::unique_ptr<WDTypedResult, std::__ndk1::default_delete<WDTypedResult> >), scoped_refptr<WebDataRequestManager>&&, std::__ndk1::unique_ptr<WebDataRequest, std::__ndk1::default_delete<WebDataRequest> >&&, std::__ndk1::unique_ptr<WDTypedResult, std::__ndk1::default_delete<WDTypedResult> >&&)+18
void base::internal::Invoker<base::internal::BindState<void (WebDataRequestManager::*)(std::__ndk1::unique_ptr<WebDataRequest, std::__ndk1::default_delete<WebDataRequest> >, std::__ndk1::unique_ptr<WDTypedResult, std::__ndk1::default_delete<WDTypedResult> >), scoped_refptr<WebDataRequestManager>, base::internal::PassedWrapper<std::__ndk1::unique_ptr<WebDataRequest, std::__ndk1::default_delete<WebDataRequest> > >, base::internal::PassedWrapper<std::__ndk1::unique_ptr<WDTypedResult, std::__ndk1::default_delete<WDTypedResult> > > >, void ()>::RunImpl<void (WebDataRequestManager::*)(std::__ndk1::unique_ptr<WebDataRequest, std::__ndk1::default_delete<WebDataRequest> >, std::__ndk1::unique_ptr<WDTypedResult, std::__ndk1::default_delete<WDTypedResult> >), std::__ndk1::tuple<scoped_refptr<WebDataRequestManager>, base::internal::PassedWrapper<std::__ndk1::unique_ptr<WebDataRequest, std::__ndk1::default_delete<WebDataRequest> > >, base::internal::PassedWrapper<std::__ndk1::unique_ptr<WDTypedResult, std::__ndk1::default_delete<WDTypedResult> > > >, 0u, 1u, 2u>(void (WebDataRequestManager::*&&)(std::__ndk1::unique_ptr<WebDataRequest, std::__ndk1::default_delete<WebDataRequest> >, std::__ndk1::unique_ptr<WDTypedResult, std::__ndk1::default_delete<WDTypedResult> >), std::__ndk1::tuple<scoped_refptr<WebDataRequestManager>, base::internal::PassedWrapper<std::__ndk1::unique_ptr<WebDataRequest, std::__ndk1::default_delete<WebDataRequest> > >, base::internal::PassedWrapper<std::__ndk1::unique_ptr<WDTypedResult, std::__ndk1::default_delete<WDTypedResult> > > >&&, std::__ndk1::integer_sequence<unsigned int, 0u, 1u, 2u>)+36
base::OnceCallback<void ()>::Run() &&
base::debug::TaskAnnotator::RunTask(char const*, base::PendingTask*)+98
base::internal::IncomingTaskQueue::RunTask(base::PendingTask*)+62
base::MessageLoop::RunTask(base::PendingTask*)+266
base::MessageLoop::DeferOrRunPendingTask(base::PendingTask
base::MessageLoop::DoWork()+406
DoRunLoopOnce(_JNIEnv*, base::android::JavaParamRef<_jobject*> const&, long long, long long, long long
Java_org_chromium_base_SystemMessageHandler_nativeDoRunLoopOnce+30
dvmPlatformInvoke+112
dvmCallJNIMethod(unsigned int const*, JValue*, Method const*, Thread*)+398
<unknown>
dvmMterpStd(Thread*)+76
dvmInterpret(Thread*, Method const*, JValue*)+184


Given that this seems to happen while the main thread is pumping messages, I don't think it's very likely that the command line never has been initialized at all (it would have failed earlier in that case), but maybe the command line got reset while the browser is running?