Well, this flag is fairly new and may not exist in your version yet. ..and if you are on an old V8 version, it's possible that your issue has been fixed in the meantime.
Please: 1. Try an up-to-date V8 version. 2. If that doesn't help, let's continue this discussion on the bugtracker. File a bug at https://crbug.com/v8/new, include your V8 version, the backtrace, and any other relevant infos (e.g. the crashing line would help). Ideally a repro case. On Tue, Jun 3, 2025 at 1:02 PM Subash <[email protected]> wrote: > Hi Jakob, seems --no-extensible_ro_snapshot option in not recognized. > getting following error > > Error: unrecognized flag --no-extensible_ro_snapshot > Try --help for options > > On Tue, Jun 3, 2025 at 4:13 PM Jakob Gruber <[email protected]> wrote: > >> >> >> On Tue, Jun 3, 2025 at 12:35 PM Subash <[email protected]> wrote: >> >>> ok Jakob, thanks for clarification. if we --no-extensible_ro_snapshot do >>> this, will it have a any performance impact. >>> >> >> I wouldn't expect a major impact, but it's impossible to say for sure >> without measuring your specific case. >> >> >>> >>> On Tue, Jun 3, 2025 at 4:01 PM Jakob Gruber <[email protected]> >>> wrote: >>> >>>> >>>> >>>> On Tue, Jun 3, 2025 at 12:17 PM Subash <[email protected]> wrote: >>>> >>>>> Hi Jakob Grube, >>>>> >>>>> I am not reusing isolate. Each js execution happens in its own >>>>> isolate. But I have a threadpool that will reuse the thread. Means the >>>>> same >>>>> thread may create another isolate after it gets a chance again. >>>>> I load the snapshot bytes into char* array. Each create the isolate i >>>>> will copy the bytes and feed to startup data in CreateParams. >>>>> >>>> >>>> With default settings, all Isolates within the same process will reuse >>>> certain resources. Perhaps most importantly, ReadOnlySpace is reused. This >>>> is why all snapshots used within the same process must have compatible RO >>>> space layout. >>>> >>>> >>>>> >>>>> I am creating a snapshot using >>>>> SnapshotCreator::CreateBlob(FunctionCodeHandling::kKeep). >>>>> >>>>> I will check with --no-extensible_ro_snapshot >>>>> >>>>> flags.append(" --no-extensible_ro_snapshot"); >>>>> v8::V8::SetFlagsFromString(flags.c_str()); >>>>> >>>>> I am disabled like this. >>>>> >>>>> >>>>> >>>>> >>>>> On Tue, Jun 3, 2025 at 1:01 PM Jakob Gruber <[email protected]> >>>>> wrote: >>>>> >>>>>> >>>>>> >>>>>> On Tue, Jun 3, 2025 at 8:29 AM Subash Durairaj < >>>>>> [email protected]> wrote: >>>>>> >>>>>>> >>>>>>> /lib/x86_64-linux-gnu/libc.so.6(+0x3bd60)[0x7fe7781b6d60] >>>>>>> >>>>>>> v8::internal::StringTableInsertionKeyC2EPNS0_7IsolateENS0_6HandleINS0_6StringEEENS0_27DeserializingUserCodeOptionE+0x1c)[0x55b7ef4e844c] >>>>>>> >>>>>>> v8::internal::StringTable::InsertForIsolateDeserializationIsolateERKSt6vectorINS0_6HandleINS0_6StringEEESaIS7_EE+0x74)[0x55b7ef416e14] >>>>>>> >>>>>>> v8::internal::SharedHeapDeserializer::DeserializeStringTableEv+0x93)[0x55b7ef4f80f3] >>>>>>> >>>>>>> v8::internal::SharedHeapDeserializer::DeserializeIntoIsolateEv+0x68)[0x55b7ef4f8448] >>>>>>> >>>>>>> v8::internal::Isolate::Init::SnapshotDataES3_S3_b+0xd0d)[0x55b7ef12e00d] >>>>>>> >>>>>>> v8::internal::Snapshot::InitializeEPNS0_7IsolateE+0x189)[0x55b7ef4f94b9] >>>>>>> v8::Isolate::Initialize::CreateParamsE+0x193)[0x55b7ef08d243] >>>>>>> v8::Isolate::New::CreateParamsE+0x22)[0x55b7ef08d532] >>>>>>> >>>>>>> >>>>>>> Hi Team, i am getting this crash when creating a new isolate. >>>>>>> >>>>>>> i am embedded v8 and running as a server to provide js execution. >>>>>>> i ran maximum of 100 isolates in parallel with two different >>>>>>> snapshot. >>>>>>> each execution choose any one of snapshot >>>>>>> >>>>>> >>>>>> We've seen problems related to using different snapshots within the >>>>>> same Isolate before. To rule this out, please try disabling the >>>>>> `extensible_ro_snapshot` when building the snapshot, either by using the >>>>>> gn >>>>>> flag: >>>>>> >>>>>> v8_enable_extensible_ro_snapshot=false >>>>>> >>>>>> or the runtime flag: >>>>>> >>>>>> --no-extensible_ro_snapshot >>>>>> >>>>>> Otherwise, we'll need more information about the crash. >>>>>> >>>>>> >>>>>>> >>>>>>> i am getting this crash randomly. wondering how to fix this >>>>>>> >>>>>>> Please give me the direction to fix this. >>>>>>> >>>>>>> -- >>>>>>> -- >>>>>>> v8-users mailing list >>>>>>> [email protected] >>>>>>> http://groups.google.com/group/v8-users >>>>>>> --- >>>>>>> You received this message because you are subscribed to the Google >>>>>>> Groups "v8-users" group. >>>>>>> To unsubscribe from this group and stop receiving emails from it, >>>>>>> send an email to [email protected]. >>>>>>> To view this discussion visit >>>>>>> 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mailing list >>>>> [email protected] >>>>> http://groups.google.com/group/v8-users >>>>> --- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "v8-users" group. >>>>> To unsubscribe from this group and stop receiving emails from it, send >>>>> an email to [email protected]. >>>>> To view this discussion visit >>>>> https://groups.google.com/d/msgid/v8-users/CAG9ciqmsmaQ8X2hXyFhgXJSe%3Dg%2Bb00xGZr__7h7D2hqwi974BQ%40mail.gmail.com >>>>> <https://groups.google.com/d/msgid/v8-users/CAG9ciqmsmaQ8X2hXyFhgXJSe%3Dg%2Bb00xGZr__7h7D2hqwi974BQ%40mail.gmail.com?utm_medium=email&utm_source=footer> >>>>> . >>>>> >>>> >>>> -- >>>> -- >>>> v8-users mailing list >>>> [email protected] >>>> http://groups.google.com/group/v8-users >>>> --- >>>> You received this message because you are subscribed to the Google >>>> Groups "v8-users" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to [email protected]. >>>> To view this 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