https/http2: random crashes on macOS with simple server

[silverwind]

• Version: v14.8.0
• Platform: macOS 10.15.6
• Subsystem: http2, https

What steps will reproduce the bug?

const cert = `-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----`;
const key = `-----BEGIN PRIVATE KEY-----
MIGHAgEAMBMGByqGSM49AgEGCCqGSM49AwEHBG0wawIBAQQgpI25EhAFjYbx2PB6
eYx3OWRk2AyxV8GUR2o4JpCU4xWhRANCAASFZ+RhPKkDKxqaUF/MqdISK51yX9zv
TaoLnnAkf/gyAUe9gFb3m/wpmlV+kIGn9H6WIQs5mENRZVKwxoOMJ/k0
-----END PRIVATE KEY-----`;

require("https").createServer({key, cert}, (_, res) => {
  res.write("ok");
  res.end();
}).listen(4000);

Save and run the script and in a second terminal create some load:

npx autocannon -d 5 -c 300 -p 10 https://localhost:4000

Server should consistently crash within a few seconds.

How often does it reproduce? Is there a required condition?

Every time

What is the expected behavior?

To not crash

What do you see instead?

It will crash with seemingly random crash signatures. Some examples:

node(74236,0x10a8e7dc0) malloc: Incorrect checksum for freed object 0x106920440: probably modified after being freed.
Corrupt value: 0x7b0a0d30310a0d0a
node(74236,0x10a8e7dc0) malloc: *** set a breakpoint in malloc_error_break to debug
[1]    74236 abort      node try.js

node(74448,0x108606dc0) malloc: *** error for object 0x1068189fb: pointer being freed was not allocated
node(74448,0x108606dc0) malloc: *** set a breakpoint in malloc_error_break to debug
[1]    74448 abort      node try.js

[1]    74410 illegal hardware instruction  node try.js

[1]    74874 segmentation fault  node try.js

Additional information

I don't see the crashes when using http, only when using https or http2 modules. Also I could not reproduce on Linux or Windows. Node was installed using Homebrew.

Crash does not happen with res.end("ok"), only with res.write("ok"); res.end().

[bnoordhuis]

Node was installed using Homebrew.

Does it also happen with binaries from https://nodejs.org/?

[silverwind]

Yes, same with the official v14.8.0 binary from the installer.

Also, here's a new signature I've seen while testing. It's so weird.

[1]    7316 bus error  node try.js

[silverwind]

Here's a backtrace of one of the illegal hardware instruction:

(lldb)
Core file '/cores/core.7517' (x86_64) was loaded.

(lldb) bt
* thread #1, stop reason = signal SIGSTOP
  * frame #0: 0x00007fff6811715a libsystem_malloc.dylib`tiny_malloc_from_free_list.cold.4
    frame #1: 0x00007fff680f9f22 libsystem_malloc.dylib`tiny_malloc_from_free_list + 1808
    frame #2: 0x00007fff680f9297 libsystem_malloc.dylib`tiny_malloc_should_clear + 288
    frame #3: 0x00007fff680f80c6 libsystem_malloc.dylib`szone_malloc_should_clear + 66
    frame #4: 0x00007fff680f6d7a libsystem_malloc.dylib`malloc_zone_malloc + 104
    frame #5: 0x00007fff680f6cf5 libsystem_malloc.dylib`malloc + 21
    frame #6: 0x00007fff6526fdea libc++abi.dylib`operator new(unsigned long) + 26
    frame #7: 0x00000001000e04ad node`std::__1::deque<node::http2::NgHttp2StreamWrite, std::__1::allocator<node::http2::NgHttp2StreamWrite> >::__add_back_capacity() + 477
    frame #8: 0x0000000100304798 node`v8::internal::TranslatedState::CreateNextTranslatedValue(int, v8::internal::TranslationIterator*, v8::internal::FixedArray, unsigned long, v8::internal::RegisterValues*, __sFILE*) + 1288
    frame #9: 0x00000001002fa77a node`v8::internal::TranslatedState::Init(v8::internal::Isolate*, unsigned long, v8::internal::TranslationIterator*, v8::internal::FixedArray, v8::internal::RegisterValues*, __sFILE*, int) + 1274
    frame #10: 0x00000001002f7f47 node`v8::internal::TranslatedState::TranslatedState(v8::internal::JavaScriptFrame const*) + 247
    frame #11: 0x000000010031924b node`v8::internal::OptimizedFrame::Summarize(std::__1::vector<v8::internal::FrameSummary, std::__1::allocator<v8::internal::FrameSummary> >*) const + 139
    frame #12: 0x000000010031fcfe node`v8::internal::(anonymous namespace)::CaptureStackTrace(v8::internal::Isolate*, v8::internal::Handle<v8::internal::Object>, v8::internal::(anonymous namespace)::CaptureStackTraceOptions) + 318
    frame #13: 0x0000000100320411 node`v8::internal::Isolate::CaptureAndSetSimpleStackTrace(v8::internal::Handle<v8::internal::JSReceiver>, v8::internal::FrameSkipMode, v8::internal::Handle<v8::internal::Object>) + 97
    frame #14: 0x0000000100333ad1 node`v8::internal::ErrorUtils::Construct(v8::internal::Isolate*, v8::internal::Handle<v8::internal::JSFunction>, v8::internal::Handle<v8::internal::Object>, v8::internal::Handle<v8::internal::Object>, v8::internal::FrameSkipMode, v8::internal::Handle<v8::internal::Object>, v8::internal::ErrorUtils::StackTraceCollection) + 337
    frame #15: 0x000000010033396e node`v8::internal::ErrorUtils::Construct(v8::internal::Isolate*, v8::internal::Handle<v8::internal::JSFunction>, v8::internal::Handle<v8::internal::Object>, v8::internal::Handle<v8::internal::Object>) + 62
    frame #16: 0x0000000100279700 node`v8::internal::Builtin_ErrorConstructor(int, unsigned long*, v8::internal::Isolate*) + 112
    frame #17: 0x0000000100a48259 node`Builtins_CEntry_Return1_DontSaveFPRegs_ArgvOnStack_BuiltinExit + 57
    frame #18: 0x00000001009dd6a1 node`Builtins_JSBuiltinsConstructStub + 97
    frame #19: 0x0000000100ac5de3 node`Builtins_ConstructHandler + 643
    frame #20: 0x00000001009e1522 node`Builtins_InterpreterEntryTrampoline + 194
    frame #21: 0x00000001009e1522 node`Builtins_InterpreterEntryTrampoline + 194
    frame #22: 0x00000001009df23a node`Builtins_JSEntryTrampoline + 90
    frame #23: 0x00000001009df018 node`Builtins_JSEntry + 120
    frame #24: 0x0000000100312b3b node`v8::internal::(anonymous namespace)::Invoke(v8::internal::Isolate*, v8::internal::(anonymous namespace)::InvokeParams const&) + 2891
    frame #25: 0x0000000100311fe2 node`v8::internal::Execution::Call(v8::internal::Isolate*, v8::internal::Handle<v8::internal::Object>, v8::internal::Handle<v8::internal::Object>, int, v8::internal::Handle<v8::internal::Object>*) + 210
    frame #26: 0x0000000100203213 node`v8::Function::Call(v8::Local<v8::Context>, v8::Local<v8::Value>, int, v8::Local<v8::Value>*) + 435
    frame #27: 0x0000000100002290 node`node::InternalMakeCallback(node::Environment*, v8::Local<v8::Object>, v8::Local<v8::Object>, v8::Local<v8::Function>, int, v8::Local<v8::Value>*, node::async_context) + 800
    frame #28: 0x0000000100015e18 node`node::AsyncWrap::MakeCallback(v8::Local<v8::Function>, int, v8::Local<v8::Value>*) + 200
    frame #29: 0x0000000100159240 node`node::ReportWritesToJSStreamListener::OnStreamAfterReqFinished(node::StreamReq*, int) + 416
    frame #30: 0x000000010015931c node`node::WriteWrap::OnDone(int) + 28
    frame #31: 0x00000001001bb107 node`node::TLSWrap::InvokeQueued(int, char const*) + 263
    frame #32: 0x00000001001bc2a9 node`node::TLSWrap::EncOut() + 505
    frame #33: 0x00000001001bdeb6 node`node::TLSWrap::DoWrite(node::WriteWrap*, uv_buf_t*, unsigned long, uv_stream_s*) + 1286
    frame #34: 0x00000001000cb00f node`node::StreamBase::Write(uv_buf_t*, unsigned long, uv_stream_s*, v8::Local<v8::Object>) + 415
    frame #35: 0x0000000100156c9a node`node::StreamBase::Writev(v8::FunctionCallbackInfo<v8::Value> const&) + 2010
    frame #36: 0x00000001001584fd node`void node::StreamBase::JSMethod<&(node::StreamBase::Writev(v8::FunctionCallbackInfo<v8::Value> const&))>(v8::FunctionCallbackInfo<v8::Value> const&) + 253
    frame #37: 0x00000001009e236d node`Builtins_CallApiCallback + 173
    frame #38: 0x00003ce53fb9819c
    frame #39: 0x00000001009e1522 node`Builtins_InterpreterEntryTrampoline + 194
    frame #40: 0x00000001009e1522 node`Builtins_InterpreterEntryTrampoline + 194
    frame #41: 0x00000001009e1522 node`Builtins_InterpreterEntryTrampoline + 194
    frame #42: 0x00000001009e1522 node`Builtins_InterpreterEntryTrampoline + 194
    frame #43: 0x00003ce53fb86bc5
    frame #44: 0x00000001009e1522 node`Builtins_InterpreterEntryTrampoline + 194
    frame #45: 0x00000001009e1522 node`Builtins_InterpreterEntryTrampoline + 194
    frame #46: 0x00000001009e1522 node`Builtins_InterpreterEntryTrampoline + 194
    frame #47: 0x00000001009e1522 node`Builtins_InterpreterEntryTrampoline + 194
    frame #48: 0x00003ce53fc897ac
    frame #49: 0x00000001009e1522 node`Builtins_InterpreterEntryTrampoline + 194
    frame #50: 0x00000001009e1522 node`Builtins_InterpreterEntryTrampoline + 194
    frame #51: 0x00000001009e1522 node`Builtins_InterpreterEntryTrampoline + 194
    frame #52: 0x00000001009e1522 node`Builtins_InterpreterEntryTrampoline + 194
    frame #53: 0x00000001009df23a node`Builtins_JSEntryTrampoline + 90
    frame #54: 0x00000001009df018 node`Builtins_JSEntry + 120
    frame #55: 0x0000000100312b3b node`v8::internal::(anonymous namespace)::Invoke(v8::internal::Isolate*, v8::internal::(anonymous namespace)::InvokeParams const&) + 2891
    frame #56: 0x0000000100311fe2 node`v8::internal::Execution::Call(v8::internal::Isolate*, v8::internal::Handle<v8::internal::Object>, v8::internal::Handle<v8::internal::Object>, int, v8::internal::Handle<v8::internal::Object>*) + 210
    frame #57: 0x0000000100203213 node`v8::Function::Call(v8::Local<v8::Context>, v8::Local<v8::Value>, int, v8::Local<v8::Value>*) + 435
    frame #58: 0x0000000100002290 node`node::InternalMakeCallback(node::Environment*, v8::Local<v8::Object>, v8::Local<v8::Object>, v8::Local<v8::Function>, int, v8::Local<v8::Value>*, node::async_context) + 800
    frame #59: 0x0000000100015e18 node`node::AsyncWrap::MakeCallback(v8::Local<v8::Function>, int, v8::Local<v8::Value>*) + 200
    frame #60: 0x0000000100159240 node`node::ReportWritesToJSStreamListener::OnStreamAfterReqFinished(node::StreamReq*, int) + 416
    frame #61: 0x000000010015931c node`node::WriteWrap::OnDone(int) + 28
    frame #62: 0x00000001001bb107 node`node::TLSWrap::InvokeQueued(int, char const*) + 263
    frame #63: 0x00000001001bc974 node`node::TLSWrap::OnStreamAfterWrite(node::WriteWrap*, int) + 308
    frame #64: 0x0000000100056db3 node`node::Environment::RunAndClearNativeImmediates(bool)::$_5::operator()(node::CallbackQueue<void, node::Environment*>*) const + 99
    frame #65: 0x00000001000565ab node`node::Environment::RunAndClearNativeImmediates(bool) + 171
    frame #66: 0x000000010005608a node`node::Environment::CheckImmediate(uv_check_s*) + 90
    frame #67: 0x00000001009cadc4 node`uv__run_check + 164
    frame #68: 0x00000001009c4349 node`uv_run + 441
    frame #69: 0x00000001000e4917 node`node::NodeMainInstance::Run() + 375
    frame #70: 0x0000000100079562 node`node::Start(int, char**) + 274
    frame #71: 0x00007fff67f40cc9 libdyld.dylib`start + 1
    frame #72: 0x00007fff67f40cc9 libdyld.dylib`start + 1

[silverwind]

And another from this signature:

node(7732,0x1083fadc0) malloc: *** error for object 0x1047cb410: pointer being freed was not allocated
node(7732,0x1083fadc0) malloc: *** set a breakpoint in malloc_error_break to debug
[1]    7732 abort (core dumped)  node try.js

Showing all threads in case it matters:

(lldb) bt all
* thread #1, stop reason = signal SIGSTOP
  * frame #0: 0x00007fff6808833a libsystem_kernel.dylib`__pthread_kill + 10
    frame #1: 0x00007fff68144e60 libsystem_pthread.dylib`pthread_kill + 430
    frame #2: 0x00007fff6800f808 libsystem_c.dylib`abort + 120
    frame #3: 0x00007fff6810550b libsystem_malloc.dylib`malloc_vreport + 548
    frame #4: 0x00007fff6810840f libsystem_malloc.dylib`malloc_report + 151
    frame #5: 0x00000001004bf803 node`v8::internal::BackingStore::~BackingStore() + 83
    frame #6: 0x00000001001be0e5 node`node::TLSWrap::DoWrite(node::WriteWrap*, uv_buf_t*, unsigned long, uv_stream_s*) + 1845
    frame #7: 0x00000001000cb00f node`node::StreamBase::Write(uv_buf_t*, unsigned long, uv_stream_s*, v8::Local<v8::Object>) + 415
    frame #8: 0x0000000100156c9a node`node::StreamBase::Writev(v8::FunctionCallbackInfo<v8::Value> const&) + 2010
    frame #9: 0x00000001001584fd node`void node::StreamBase::JSMethod<&(node::StreamBase::Writev(v8::FunctionCallbackInfo<v8::Value> const&))>(v8::FunctionCallbackInfo<v8::Value> const&) + 253
    frame #10: 0x00000001009e236d node`Builtins_CallApiCallback + 173
    frame #11: 0x00001cb61f0d7dfc
    frame #12: 0x00000001009e1522 node`Builtins_InterpreterEntryTrampoline + 194
    frame #13: 0x00000001009e1522 node`Builtins_InterpreterEntryTrampoline + 194
    frame #14: 0x00000001009e1522 node`Builtins_InterpreterEntryTrampoline + 194
    frame #15: 0x00000001009e1522 node`Builtins_InterpreterEntryTrampoline + 194
    frame #16: 0x00001cb61f0ee3c5
    frame #17: 0x00000001009e1522 node`Builtins_InterpreterEntryTrampoline + 194
    frame #18: 0x00000001009e1522 node`Builtins_InterpreterEntryTrampoline + 194
    frame #19: 0x00000001009e1522 node`Builtins_InterpreterEntryTrampoline + 194
    frame #20: 0x00000001009e1522 node`Builtins_InterpreterEntryTrampoline + 194
    frame #21: 0x00001cb61f0e1b8c
    frame #22: 0x00001cb61f0c58cd
    frame #23: 0x00000001009e1522 node`Builtins_InterpreterEntryTrampoline + 194
    frame #24: 0x00000001009e1522 node`Builtins_InterpreterEntryTrampoline + 194
    frame #25: 0x00000001009e1522 node`Builtins_InterpreterEntryTrampoline + 194
    frame #26: 0x00000001009df23a node`Builtins_JSEntryTrampoline + 90
    frame #27: 0x00000001009df018 node`Builtins_JSEntry + 120
    frame #28: 0x0000000100312b3b node`v8::internal::(anonymous namespace)::Invoke(v8::internal::Isolate*, v8::internal::(anonymous namespace)::InvokeParams const&) + 2891
    frame #29: 0x0000000100311fe2 node`v8::internal::Execution::Call(v8::internal::Isolate*, v8::internal::Handle<v8::internal::Object>, v8::internal::Handle<v8::internal::Object>, int, v8::internal::Handle<v8::internal::Object>*) + 210
    frame #30: 0x0000000100203213 node`v8::Function::Call(v8::Local<v8::Context>, v8::Local<v8::Value>, int, v8::Local<v8::Value>*) + 435
    frame #31: 0x0000000100002290 node`node::InternalMakeCallback(node::Environment*, v8::Local<v8::Object>, v8::Local<v8::Object>, v8::Local<v8::Function>, int, v8::Local<v8::Value>*, node::async_context) + 800
    frame #32: 0x0000000100015e18 node`node::AsyncWrap::MakeCallback(v8::Local<v8::Function>, int, v8::Local<v8::Value>*) + 200
    frame #33: 0x0000000100159240 node`node::ReportWritesToJSStreamListener::OnStreamAfterReqFinished(node::StreamReq*, int) + 416
    frame #34: 0x000000010015931c node`node::WriteWrap::OnDone(int) + 28
    frame #35: 0x00000001001bb107 node`node::TLSWrap::InvokeQueued(int, char const*) + 263
    frame #36: 0x00000001001bc974 node`node::TLSWrap::OnStreamAfterWrite(node::WriteWrap*, int) + 308
    frame #37: 0x0000000100056db3 node`node::Environment::RunAndClearNativeImmediates(bool)::$_5::operator()(node::CallbackQueue<void, node::Environment*>*) const + 99
    frame #38: 0x00000001000565ab node`node::Environment::RunAndClearNativeImmediates(bool) + 171
    frame #39: 0x000000010005608a node`node::Environment::CheckImmediate(uv_check_s*) + 90
    frame #40: 0x00000001009cadc4 node`uv__run_check + 164
    frame #41: 0x00000001009c4349 node`uv_run + 441
    frame #42: 0x00000001000e4917 node`node::NodeMainInstance::Run() + 375
    frame #43: 0x0000000100079562 node`node::Start(int, char**) + 274
    frame #44: 0x00007fff67f40cc9 libdyld.dylib`start + 1
    frame #45: 0x00007fff67f40cc9 libdyld.dylib`start + 1
  thread #2, stop reason = signal SIGSTOP
    frame #0: 0x00007fff68086766 libsystem_kernel.dylib`kevent + 10
    frame #1: 0x00000001009d6fc0 node`uv__io_poll + 896
    frame #2: 0x00000001009c4341 node`uv_run + 433
    frame #3: 0x0000000100110e59 node`node::WorkerThreadsTaskRunner::DelayedTaskScheduler::Run() + 361
    frame #4: 0x00007fff68145109 libsystem_pthread.dylib`_pthread_start + 148
    frame #5: 0x00007fff68140b8b libsystem_pthread.dylib`thread_start + 15
  thread #3, stop reason = signal SIGSTOP
    frame #0: 0x00007fff68084882 libsystem_kernel.dylib`__psynch_cvwait + 10
    frame #1: 0x00007fff68145425 libsystem_pthread.dylib`_pthread_cond_wait + 698
    frame #2: 0x00000001009d1d89 node`uv_cond_wait + 9
    frame #3: 0x0000000100111078 node`node::TaskQueue<v8::Task>::BlockingPop() + 72
    frame #4: 0x000000010010e07b node`node::(anonymous namespace)::PlatformWorkerThread(void*) + 379
    frame #5: 0x00007fff68145109 libsystem_pthread.dylib`_pthread_start + 148
    frame #6: 0x00007fff68140b8b libsystem_pthread.dylib`thread_start + 15
  thread #4, stop reason = signal SIGSTOP
    frame #0: 0x00007fff68084882 libsystem_kernel.dylib`__psynch_cvwait + 10
    frame #1: 0x00007fff68145425 libsystem_pthread.dylib`_pthread_cond_wait + 698
    frame #2: 0x00000001009d1d89 node`uv_cond_wait + 9
    frame #3: 0x0000000100111078 node`node::TaskQueue<v8::Task>::BlockingPop() + 72
    frame #4: 0x000000010010e07b node`node::(anonymous namespace)::PlatformWorkerThread(void*) + 379
    frame #5: 0x00007fff68145109 libsystem_pthread.dylib`_pthread_start + 148
    frame #6: 0x00007fff68140b8b libsystem_pthread.dylib`thread_start + 15
  thread #5, stop reason = signal SIGSTOP
    frame #0: 0x00007fff68084882 libsystem_kernel.dylib`__psynch_cvwait + 10
    frame #1: 0x00007fff68145425 libsystem_pthread.dylib`_pthread_cond_wait + 698
    frame #2: 0x00000001009d1d89 node`uv_cond_wait + 9
    frame #3: 0x0000000100111078 node`node::TaskQueue<v8::Task>::BlockingPop() + 72
    frame #4: 0x000000010010e07b node`node::(anonymous namespace)::PlatformWorkerThread(void*) + 379
    frame #5: 0x00007fff68145109 libsystem_pthread.dylib`_pthread_start + 148
    frame #6: 0x00007fff68140b8b libsystem_pthread.dylib`thread_start + 15
  thread #6, stop reason = signal SIGSTOP
    frame #0: 0x00007fff68084882 libsystem_kernel.dylib`__psynch_cvwait + 10
    frame #1: 0x00007fff68145425 libsystem_pthread.dylib`_pthread_cond_wait + 698
    frame #2: 0x00000001009d1d89 node`uv_cond_wait + 9
    frame #3: 0x0000000100111078 node`node::TaskQueue<v8::Task>::BlockingPop() + 72
    frame #4: 0x000000010010e07b node`node::(anonymous namespace)::PlatformWorkerThread(void*) + 379
    frame #5: 0x00007fff68145109 libsystem_pthread.dylib`_pthread_start + 148
    frame #6: 0x00007fff68140b8b libsystem_pthread.dylib`thread_start + 15
  thread #7, stop reason = signal SIGSTOP
    frame #0: 0x00007fff68081e36 libsystem_kernel.dylib`semaphore_wait_trap + 10
    frame #1: 0x00000001009d2310 node`uv_sem_wait + 16
    frame #2: 0x0000000100174c73 node`node::inspector::(anonymous namespace)::StartIoThreadMain(void*) + 19
    frame #3: 0x00007fff68145109 libsystem_pthread.dylib`_pthread_start + 148
    frame #4: 0x00007fff68140b8b libsystem_pthread.dylib`thread_start + 15

[silverwind]

Anyone able to reproduce?

I can myself reproduce on two machines but I still wonder if this is something about my particular setups.

[bnoordhuis]

I've not been able to reproduce with either v14.8.0 or master. I'm running macOS 10.14.6 and using wrk-d 30s -c 50 -t 10 to generate load.

[silverwind]

Can't get it to crash using wrk no matter how high I go with connections/threads, but autocannon consistently does it within 5 seconds.

$ wrk -d 5s -c 5000 -t 100 https://localhost:4000
Running 5s test @ https://localhost:4000
  100 threads and 5000 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency    93.17ms  182.04ms   1.89s    96.48%
    Req/Sec   115.55    279.75     3.49k    96.75%
  24935 requests in 5.10s, 3.40MB read
  Socket errors: connect 112, read 0, write 0, timeout 829
Requests/sec:   4887.93
Transfer/sec:    682.59KB

$ npx autocannon -d 5 -c 300 -p 10 https://localhost:4000
Running 5s test @ https://localhost:4000
300 connections with 10 pipelining factor

┌─────────┬──────┬──────┬───────┬───────┬──────────┬──────────┬───────────┐
│ Stat    │ 2.5% │ 50%  │ 97.5% │ 99%   │ Avg      │ Stdev    │ Max       │
├─────────┼──────┼──────┼───────┼───────┼──────────┼──────────┼───────────┤
│ Latency │ 0 ms │ 4 ms │ 35 ms │ 65 ms │ 10.27 ms │ 18.47 ms │ 325.29 ms │
└─────────┴──────┴──────┴───────┴───────┴──────────┴──────────┴───────────┘
┌───────────┬────────┬────────┬─────────┬─────────┬─────────┬─────────┬────────┐
│ Stat      │ 1%     │ 2.5%   │ 50%     │ 97.5%   │ Avg     │ Stdev   │ Min    │
├───────────┼────────┼────────┼─────────┼─────────┼─────────┼─────────┼────────┤
│ Req/Sec   │ 25871  │ 25871  │ 29215   │ 30927   │ 28888   │ 1686.95 │ 25867  │
├───────────┼────────┼────────┼─────────┼─────────┼─────────┼─────────┼────────┤
│ Bytes/Sec │ 3.7 MB │ 3.7 MB │ 4.18 MB │ 4.42 MB │ 4.13 MB │ 241 kB  │ 3.7 MB │
└───────────┴────────┴────────┴─────────┴─────────┴─────────┴─────────┴────────┘

Req/Bytes counts sampled once per second.

144k requests in 5.22s, 20.7 MB read

[silverwind]

Something odd I noticed: If I set autocannon to test for 15s (-d 15), it will only crash after 15s so maybe the crash reason is something that autocannon does during its teardown. cc: @mcollina.

[szmarczak]

I'm experiencing something similar on macOS:

/Users/runner/hostedtoolcache/node/15.3.0/x64/bin/node[1207]: ../src/node_http2.cc:1478:void node::http2::Http2Session::MaybeScheduleWrite(): Assertion `!is_write_scheduled()' failed.
 1: 0x101366e15 node::Abort() (.cold.1) [/Users/runner/hostedtoolcache/node/15.3.0/x64/bin/node]
 2: 0x1000be439 node::Abort() [/Users/runner/hostedtoolcache/node/15.3.0/x64/bin/node]
 3: 0x1000be2a1 node::Assert(node::AssertionInfo const&) [/Users/runner/hostedtoolcache/node/15.3.0/x64/bin/node]
 4: 0x1000dd591 node::http2::Http2Session::MaybeScheduleWrite() [/Users/runner/hostedtoolcache/node/15.3.0/x64/bin/node]
 5: 0x1000e4ef5 node::http2::Http2Session::OnStreamRead(long, uv_buf_t const&) [/Users/runner/hostedtoolcache/node/15.3.0/x64/bin/node]
 6: 0x1001fd9b3 node::crypto::TLSWrap::ClearOut() [/Users/runner/hostedtoolcache/node/15.3.0/x64/bin/node]
 7: 0x100200140 node::crypto::TLSWrap::OnStreamRead(long, uv_buf_t const&) [/Users/runner/hostedtoolcache/node/15.3.0/x64/bin/node]
 8: 0x10017e5ab node::LibuvStreamWrap::OnUvRead(long, uv_buf_t const*) [/Users/runner/hostedtoolcache/node/15.3.0/x64/bin/node]
 9: 0x100a4d78e uv__stream_io [/Users/runner/hostedtoolcache/node/15.3.0/x64/bin/node]
10: 0x100a562fc uv__io_poll [/Users/runner/hostedtoolcache/node/15.3.0/x64/bin/node]
11: 0x100a42c71 uv_run [/Users/runner/hostedtoolcache/node/15.3.0/x64/bin/node]
12: 0x100002d24 node::SpinEventLoop(node::Environment*) [/Users/runner/hostedtoolcache/node/15.3.0/x64/bin/node]
13: 0x1000febb4 node::NodeMainInstance::Run(node::EnvSerializeInfo const*) [/Users/runner/hostedtoolcache/node/15.3.0/x64/bin/node]
14: 0x100091c84 node::Start(int, char**) [/Users/runner/hostedtoolcache/node/15.3.0/x64/bin/node]
15: 0x7fff67898cc9 start [/usr/lib/system/libdyld.dylib]
  ✖ test/request.js exited due to SIGABRT

https://github.com/szmarczak/http2-wrapper/runs/1461272600#step:4:220

[szmarczak]

Same on Windows:

https://github.com/szmarczak/http2-wrapper/runs/1461293601#step:4:90

[szmarczak]

Currently I'm unable to provide any reproducible code but I'll switch to Windows on my PC and try to figure out what's wrong.