nREPL crash #722

shantanu-sardesai · 2026-03-28T04:38:50Z

shantanu-sardesai
Mar 28, 2026
Collaborator

Issue Description

The jank nREPL server crashes when Conjure attempts to connect to it.

Conjure logs:

; localhost:60640 (ECONNREFUSED): /Users/shantanusardesai/Desktop/code/projects/jank/compiler+runtime/.nrepl-port
; --------------------------------------------------------------------------------
; localhost:60640 (disconnected): /Users/shantanusardesai/Desktop/code/projects/jank/compiler+runtime/.nrepl-port

Not sure if this is a MacOS thing or unrelated.

Reproduction Steps

Trying to connect to the nREPL server via the CLI.

$ lsof -i:60640

COMMAND     PID             USER   FD   TYPE             DEVICE SIZE/OFF NODE NAME
jank-phas 54863 shantanusardesai    7u  IPv4 0xc0697bdb60d04f53      0t0  TCP localhost:60640 (LISTEN)

$ echo 'd2:op4:eval4:code7:(+ 1 2)2:id3:123e' | nc localhost 60640 | cat          # I'm using the port that jank print. Used AI to get this command, since simple `curl` wouldn't work well with bencode.

d3:out0:2:id3:123ed3:err0:2:id3:123ed5:value1:32:ns4:user6:statusl4:donee2:id3:123e^C

$ lsof -i:60640

COMMAND     PID             USER   FD   TYPE             DEVICE SIZE/OFF NODE NAME
jank-phas 54863 shantanusardesai    7u  IPv4 0xc0697bdb60d04f53      0t0  TCP localhost:60640 (LISTEN)
jank-phas 54863 shantanusardesai    9u  IPv4 0x314db5040291a0b2      0t0  TCP localhost:60640->localhost:60642 (CLOSE_WAIT)

jank health check

─ system ───────────────────────────────────────────────────────────────────────────────────────────
─ ✅ operating system: macos
─ ✅ default triple: arm64-apple-darwin24.6.0

─ jank install ─────────────────────────────────────────────────────────────────────────────────────
─ ✅ jank version: jank-0.1-alpha
─ ⚠️ jank assertions are enabled; performance will be impacted
─ ✅ jank resource dir: ../lib/jank/0.1
─ ✅ jank resolved resource dir: /Users/shantanusardesai/Desktop/code/projects/jank/compiler+runtime/build/../lib/jank/0.1 (ignored for dev build)
─ ✅ jank user cache dir: /Users/shantanusardesai/.cache/jank/arm64-apple-darwin24.6.0-602a00cc521ebfad938a375934f711a64981d713b10c9d30279b16452e2ce945 (not found)

─ clang install ────────────────────────────────────────────────────────────────────────────────────
─ ✅ configured clang path: /Users/shantanusardesai/Desktop/code/projects/jank/compiler+runtime/build/llvm-install/usr/local/bin/clang++ (found)
─ ✅ configured clang resource dir: /Users/shantanusardesai/Desktop/code/projects/jank/compiler+runtime/build/llvm-install/usr/local/lib/clang/22 (found)

─ jank runtime ─────────────────────────────────────────────────────────────────────────────────────
─ ✅ jank runtime initialized
─ ✅ jank pch path: /Users/shantanusardesai/.cache/jank/arm64-apple-darwin24.6.0-602a00cc521ebfad938a375934f711a64981d713b10c9d30279b16452e2ce945 (found)
─ ✅ jank can jit compile c++
warning: (arm64)  skipping debug map object with duplicate name and timestamp: 2026-03-19 19:17:33.000000000 /Users/shantanusardesai/Desktop/code/projects/jank/compiler+runtime/build/libjank-standalone.a(processor.cpp.o)
─ ✅ jank can aot compile working binaries

Stack trace

user=> Process 96341 stopped
* thread #13, stop reason = EXC_BAD_ACCESS (code=1, address=0x1000)
    frame #0: 0x0000000100eb2300 jank`return_single_freelist(fl=0x0000000000001000, gfl=0x0000000101203ea8) at thread_local_alloc.c:60:11
   57       /* Concatenate. */
   58       do {
   59         q_ptr = &obj_link(q);
-> 60         q = *q_ptr;
   61       } while (ADDR(q) >= HBLKSIZE);
   62       GC_ASSERT(NULL == q);
   63       *q_ptr = *gfl;
Target 0: (jank) stopped.
(lldb) bt
* thread #13, stop reason = EXC_BAD_ACCESS (code=1, address=0x1000)
frame #0: 0x0000000100eb20f0 jank`return_single_freelist(fl=0x0000000000001000, gfl=0x0000000101203ea8) at thread_local_alloc.c:60:11
frame #1: 0x0000000100eb19ac jank`return_freelists(fl=0x0000000104c29828, gfl=0x0000000101203ea0) at thread_local_alloc.c:79:7
frame #2: 0x0000000100eb1910 jank`GC_destroy_thread_local(p=0x0000000104c29828) at thread_local_alloc.c:166:5
frame #3: 0x0000000100eaf868 jank`GC_unregister_my_thread_inner(me=0x0000000104c29800) at pthread_support.c:2387:3
frame #4: 0x0000000100eafb24 jank`GC_thread_exit_proc(arg=0x0000000104c29800) at pthread_support.c:2639:3
frame #5: 0x0000000100eae1b4 jank`GC_pthread_start_inner(sb=0x000000017048af88, arg=0x00000001703fc8f8) at pthread_start.c:77:3
frame #6: 0x0000000100ea6968 jank`GC_call_with_stack_base(fn=(jank`GC_pthread_start_inner at pthread_start.c:52), arg=0x00000001703fc8f8) at misc.c:2539:12
frame #7: 0x0000000100eb04c8 jank`GC_pthread_start(arg=0x00000001703fc8f8) at pthread_support.c:2814:10
frame #8: 0x00000001838fbbc8 libsystem_pthread.dylib`_pthread_start + 136

Stack trace for the main thread:

  thread #1, queue = 'com.apple.main-thread'
    frame #0: 0x00000001838ba7dc libsystem_kernel.dylib`read + 8
    frame #1: 0x00000001d58780a4 libedit.3.dylib`___lldb_unnamed_symbol419 + 80
    frame #2: 0x00000001d5878354 libedit.3.dylib`el_wgetc + 108
    frame #3: 0x00000001d5878588 libedit.3.dylib`el_wgets + 116
    frame #4: 0x00000001d5883dbc libedit.3.dylib`el_gets + 52
    frame #5: 0x0000000111a3b990 libLLVM.dylib`llvm::LineEditor::readLine() const + 52
    frame #6: 0x0000000100004e90 jank`jank::repl() at main.cpp:265:25
    frame #7: 0x0000000100003564 jank`main::$_0::operator()(this=0x000000016fdfdfbf, argc=2, argv=0x000000016fdfe7d8) const at main.cpp:481:9
    frame #8: 0x0000000100003140 jank`main::$_0::__invoke(argc=2, argv=0x000000016fdfe7d8) at main.cpp:399:60
    frame #9: 0x0000000100404be0 jank`jank_init_with_pch(argc=2, argv=0x000000016fdfe7d8, init_default_ctx='\0', pch_data=0x0000000000000000, pch_size=0, fn=(jank`main::$_0::__invoke(int, char const**) at main.cpp:399)) at c_api.cpp:1060:14
    frame #10: 0x0000000100404a24 jank`jank_init(argc=2, argv=0x000000016fdfe7d8, init_default_ctx='\0', fn=(jank`main::$_0::__invoke(int, char const**) at main.cpp:399)) at c_api.cpp:1022:12
    frame #11: 0x0000000100002afc jank`main(argc=2, argv=0x000000016fdfe7d8) at main.cpp:399:10
    frame #12: 0x000000018355ab98 dyld`start + 6076

Stack traces for all threads:

(lldb) bt all
  thread #1, queue = 'com.apple.main-thread'
    frame #0: 0x00000001838ba7dc libsystem_kernel.dylib`read + 8
    frame #1: 0x00000001d58780a4 libedit.3.dylib`___lldb_unnamed_symbol419 + 80
    frame #2: 0x00000001d5878354 libedit.3.dylib`el_wgetc + 108
    frame #3: 0x00000001d5878588 libedit.3.dylib`el_wgets + 116
    frame #4: 0x00000001d5883dbc libedit.3.dylib`el_gets + 52
    frame #5: 0x0000000111a3b990 libLLVM.dylib`llvm::LineEditor::readLine() const + 52
    frame #6: 0x0000000100004e90 jank`jank::repl() at main.cpp:265:25
    frame #7: 0x0000000100003564 jank`main::$_0::operator()(this=0x000000016fdfdfbf, argc=2, argv=0x000000016fdfe7d8) const at main.cpp:481:9
    frame #8: 0x0000000100003140 jank`main::$_0::__invoke(argc=2, argv=0x000000016fdfe7d8) at main.cpp:399:60
    frame #9: 0x0000000100404be0 jank`jank_init_with_pch(argc=2, argv=0x000000016fdfe7d8, init_default_ctx='\0', pch_data=0x0000000000000000, pch_size=0, fn=(jank`main::$_0::__invoke(int, char const**) at main.cpp:399)) at c_api.cpp:1060:14
    frame #10: 0x0000000100404a24 jank`jank_init(argc=2, argv=0x000000016fdfe7d8, init_default_ctx='\0', fn=(jank`main::$_0::__invoke(int, char const**) at main.cpp:399)) at c_api.cpp:1022:12
    frame #11: 0x0000000100002afc jank`main(argc=2, argv=0x000000016fdfe7d8) at main.cpp:399:10
    frame #12: 0x000000018355ab98 dyld`start + 6076
  thread #2, name = 'GC-marker-0'
    frame #0: 0x00000001838bd3cc libsystem_kernel.dylib`__psynch_cvwait + 8
    frame #1: 0x00000001838fc09c libsystem_pthread.dylib`_pthread_cond_wait + 984
    frame #2: 0x0000000100eb0a10 jank`GC_wait_marker at pthread_support.c:3281:7
    frame #3: 0x0000000100ea1834 jank`GC_help_marker(my_mark_no=15) at mark.c:1401:5
    frame #4: 0x0000000100eae940 jank`GC_mark_thread(id=0x0000000000000000) at pthread_support.c:528:5
    frame #5: 0x00000001838fbbc8 libsystem_pthread.dylib`_pthread_start + 136
  thread #3, name = 'GC-marker-1'
    frame #0: 0x00000001838bd3cc libsystem_kernel.dylib`__psynch_cvwait + 8
    frame #1: 0x00000001838fc09c libsystem_pthread.dylib`_pthread_cond_wait + 984
    frame #2: 0x0000000100eb0a10 jank`GC_wait_marker at pthread_support.c:3281:7
    frame #3: 0x0000000100ea1834 jank`GC_help_marker(my_mark_no=15) at mark.c:1401:5
    frame #4: 0x0000000100eae940 jank`GC_mark_thread(id=0x0000000000000001) at pthread_support.c:528:5
    frame #5: 0x00000001838fbbc8 libsystem_pthread.dylib`_pthread_start + 136
  thread #4, name = 'GC-marker-2'
    frame #0: 0x00000001838bd3cc libsystem_kernel.dylib`__psynch_cvwait + 8
    frame #1: 0x00000001838fc09c libsystem_pthread.dylib`_pthread_cond_wait + 984
    frame #2: 0x0000000100eb0a10 jank`GC_wait_marker at pthread_support.c:3281:7
    frame #3: 0x0000000100ea1834 jank`GC_help_marker(my_mark_no=15) at mark.c:1401:5
    frame #4: 0x0000000100eae940 jank`GC_mark_thread(id=0x0000000000000002) at pthread_support.c:528:5
    frame #5: 0x00000001838fbbc8 libsystem_pthread.dylib`_pthread_start + 136
  thread #5, name = 'GC-marker-3'
    frame #0: 0x00000001838bd3cc libsystem_kernel.dylib`__psynch_cvwait + 8
    frame #1: 0x00000001838fc09c libsystem_pthread.dylib`_pthread_cond_wait + 984
    frame #2: 0x0000000100eb0a10 jank`GC_wait_marker at pthread_support.c:3281:7
    frame #3: 0x0000000100ea1834 jank`GC_help_marker(my_mark_no=15) at mark.c:1401:5
    frame #4: 0x0000000100eae940 jank`GC_mark_thread(id=0x0000000000000003) at pthread_support.c:528:5
    frame #5: 0x00000001838fbbc8 libsystem_pthread.dylib`_pthread_start + 136
  thread #6, name = 'GC-marker-4'
    frame #0: 0x00000001838bd3cc libsystem_kernel.dylib`__psynch_cvwait + 8
    frame #1: 0x00000001838fc09c libsystem_pthread.dylib`_pthread_cond_wait + 984
    frame #2: 0x0000000100eb0a10 jank`GC_wait_marker at pthread_support.c:3281:7
    frame #3: 0x0000000100ea1834 jank`GC_help_marker(my_mark_no=15) at mark.c:1401:5
    frame #4: 0x0000000100eae940 jank`GC_mark_thread(id=0x0000000000000004) at pthread_support.c:528:5
    frame #5: 0x00000001838fbbc8 libsystem_pthread.dylib`_pthread_start + 136
  thread #7, name = 'GC-marker-5'
    frame #0: 0x00000001838bd3cc libsystem_kernel.dylib`__psynch_cvwait + 8
    frame #1: 0x00000001838fc09c libsystem_pthread.dylib`_pthread_cond_wait + 984
    frame #2: 0x0000000100eb0a10 jank`GC_wait_marker at pthread_support.c:3281:7
    frame #3: 0x0000000100ea1834 jank`GC_help_marker(my_mark_no=15) at mark.c:1401:5
    frame #4: 0x0000000100eae940 jank`GC_mark_thread(id=0x0000000000000005) at pthread_support.c:528:5
    frame #5: 0x00000001838fbbc8 libsystem_pthread.dylib`_pthread_start + 136
  thread #8, name = 'GC-marker-6'
    frame #0: 0x00000001838bd3cc libsystem_kernel.dylib`__psynch_cvwait + 8
    frame #1: 0x00000001838fc09c libsystem_pthread.dylib`_pthread_cond_wait + 984
    frame #2: 0x0000000100eb0a10 jank`GC_wait_marker at pthread_support.c:3281:7
    frame #3: 0x0000000100ea1834 jank`GC_help_marker(my_mark_no=15) at mark.c:1401:5
    frame #4: 0x0000000100eae940 jank`GC_mark_thread(id=0x0000000000000006) at pthread_support.c:528:5
    frame #5: 0x00000001838fbbc8 libsystem_pthread.dylib`_pthread_start + 136
  thread #9, name = 'GC-marker-7'
    frame #0: 0x00000001838bd3cc libsystem_kernel.dylib`__psynch_cvwait + 8
    frame #1: 0x00000001838fc09c libsystem_pthread.dylib`_pthread_cond_wait + 984
    frame #2: 0x0000000100eb0a10 jank`GC_wait_marker at pthread_support.c:3281:7
    frame #3: 0x0000000100ea1834 jank`GC_help_marker(my_mark_no=15) at mark.c:1401:5
    frame #4: 0x0000000100eae940 jank`GC_mark_thread(id=0x0000000000000007) at pthread_support.c:528:5
    frame #5: 0x00000001838fbbc8 libsystem_pthread.dylib`_pthread_start + 136
  thread #10, name = 'GC-marker-8'
    frame #0: 0x00000001838bd3cc libsystem_kernel.dylib`__psynch_cvwait + 8
    frame #1: 0x00000001838fc09c libsystem_pthread.dylib`_pthread_cond_wait + 984
    frame #2: 0x0000000100eb0a10 jank`GC_wait_marker at pthread_support.c:3281:7
    frame #3: 0x0000000100ea1834 jank`GC_help_marker(my_mark_no=15) at mark.c:1401:5
    frame #4: 0x0000000100eae940 jank`GC_mark_thread(id=0x0000000000000008) at pthread_support.c:528:5
    frame #5: 0x00000001838fbbc8 libsystem_pthread.dylib`_pthread_start + 136
  thread #11, name = 'GC-marker-9'
    frame #0: 0x00000001838bd3cc libsystem_kernel.dylib`__psynch_cvwait + 8
    frame #1: 0x00000001838fc09c libsystem_pthread.dylib`_pthread_cond_wait + 984
    frame #2: 0x0000000100eb0a10 jank`GC_wait_marker at pthread_support.c:3281:7
    frame #3: 0x0000000100ea1834 jank`GC_help_marker(my_mark_no=15) at mark.c:1401:5
    frame #4: 0x0000000100eae940 jank`GC_mark_thread(id=0x0000000000000009) at pthread_support.c:528:5
    frame #5: 0x00000001838fbbc8 libsystem_pthread.dylib`_pthread_start + 136
  thread #12
    frame #0: 0x00000001838c246c libsystem_kernel.dylib`__accept + 8
    frame #1: 0x0000000100e42e8c jank`int boost::asio::detail::socket_ops::call_accept<unsigned int>((null)=0x0000000000000008, s=7, addr=0x0000000000000000, addrlen=0x0000000000000000) at socket_ops.ipp:105:24
    frame #2: 0x0000000100e42d4c jank`boost::asio::detail::socket_ops::accept(s=7, addr=0x0000000000000000, addrlen=0x0000000000000000, ec=0x00000001703fc960) at socket_ops.ipp:122:23
    frame #3: 0x0000000100e428b4 jank`boost::asio::detail::socket_ops::sync_accept(s=7, state='\x10', addr=0x0000000000000000, addrlen=0x0000000000000000, ec=0x00000001703fc960) at socket_ops.ipp:150:30
    frame #4: 0x0000000100e42694 jank`boost::system::error_code boost::asio::detail::reactive_socket_service<boost::asio::ip::tcp>::accept<boost::asio::basic_socket<boost::asio::ip::tcp, boost::asio::any_io_executor>>(this=0x000060000118c700, impl=0x000060000088cb78, peer=0x00000001385b8000, peer_endpoint=0x0000000000000000, ec=0x00000001703fc960) at reactive_socket_service.hpp:493:30
    frame #5: 0x0000000100e4252c jank`void boost::asio::basic_socket_acceptor<boost::asio::ip::tcp, boost::asio::any_io_executor>::accept<boost::asio::ip::tcp, boost::asio::any_io_executor>(this=0x000060000088cb70, peer=0x00000001385b8000, (null)=0) at basic_socket_acceptor.hpp:1290:25
    frame #6: 0x0000000100e31fac jank`jank::nrepl::server::native_client::impl::accept(this=0x00000001385b8000, acceptor=0x000060000088cb70) at server.cpp:22:16
    frame #7: 0x0000000100e2df0c jank`jank::nrepl::server::native_server::impl::accept(this=0x000060000088cb58) at server.cpp:89:13
    frame #8: 0x0000000100e2de50 jank`jank::nrepl::server::native_server::accept(this=0x00000001062b8e60) const at server.cpp:118:23
    frame #9: 0x0000000104edc7d4
    frame #10: 0x000000010095a6e4 jank`jank::runtime::obj::jit_function::call(this=0x0000000106346300, a1=jank::runtime::object_ref @ 0x00000001703fcb50) const at jit_function.cpp:70:12
    frame #11: 0x00000001008e9440 jank`jank::runtime::dynamic_call(source=jank::runtime::object_ref @ 0x00000001703fcbc0, a1=jank::runtime::object_ref @ 0x00000001703fcbb8) at call.cpp:41:24
    frame #12: 0x0000000104ede0c4
    frame #13: 0x000000010095a6e4 jank`jank::runtime::obj::jit_function::call(this=0x0000000106346080, a1=jank::runtime::object_ref @ 0x00000001703fcd60) const at jit_function.cpp:70:12
    frame #14: 0x00000001008e92f8 jank`jank::runtime::dynamic_call(source=jank::runtime::object_ref @ 0x00000001703fcda0) at call.cpp:20:24
    frame #15: 0x00000001008f0570 jank`_ZZN4jank7runtime8apply_toENS0_4orefINS0_6objectEEES3_ENK3$_0clINS1_INS0_3obj3nilEEEEES3_T_(this=0x00000001703feaa0, typed_args=jank::runtime::oref<jank::runtime::obj::nil> @ 0x00000001703fd500) at call.cpp:544:20
    frame #16: 0x00000001008ee3b4 jank`auto jank::runtime::visit_seqable<jank::runtime::apply_to(jank::runtime::oref<jank::runtime::object>, jank::runtime::oref<jank::runtime::object>)::$_0, auto jank::runtime::visit_seqable<jank::runtime::apply_to(jank::runtime::oref<jank::runtime::object>, jank::runtime::oref<jank::runtime::object>)::$_0>(jank::runtime::apply_to(jank::runtime::oref<jank::runtime::object>, jank::runtime::oref<jank::runtime::object>)::$_0 const&, jank::runtime::oref<jank::runtime::object>)::'lambda'()>(fn=0x00000001703feaa0, else_fn=0x00000001703fea60, erased=jank::runtime::object_ref @ 0x00000001703fddc8) at visit.hpp:259:16
    frame #17: 0x00000001008eda7c jank`auto jank::runtime::visit_seqable<jank::runtime::apply_to(jank::runtime::oref<jank::runtime::object>, jank::runtime::oref<jank::runtime::object>)::$_0>(fn=0x00000001703feaa0, erased=jank::runtime::object_ref @ 0x00000001703fea70) at visit.hpp:328:12
    frame #18: 0x00000001008eda34 jank`jank::runtime::apply_to(source=jank::runtime::object_ref @ 0x00000001703feab0, args=jank::runtime::object_ref @ 0x00000001703feaa8) at call.cpp:531:12
    frame #19: 0x000000010095a828 jank`jank::runtime::obj::jit_function::call(this=0x0000000104898b00, a1=jank::runtime::object_ref @ 0x00000001703feb50, a2=jank::runtime::object_ref @ 0x00000001703feb48) const at jit_function.cpp:79:12
    frame #20: 0x00000001008e96a4 jank`jank::runtime::dynamic_call(source=jank::runtime::object_ref @ 0x00000001703fec00, a1=jank::runtime::object_ref @ 0x00000001703febf8, a2=jank::runtime::object_ref @ 0x00000001703febf0) at call.cpp:62:24
    frame #21: 0x000000010095ca38 jank`jank::runtime::obj::jit_closure::call(this=0x00000001048c2cf0) const at jit_closure.cpp:62:12
    frame #22: 0x00000001008e9314 jank`jank::runtime::dynamic_call(source=jank::runtime::object_ref @ 0x00000001703fecc0) at call.cpp:22:24
    frame #23: 0x00000001005d62f4 jank`jank::runtime::future(jank::runtime::oref<jank::runtime::object>)::$_0::operator()(this=0x0000600003acad28) const at core.cpp:755:25
    frame #25: 0x00000001005d61a4 jank`void std::__1::__thread_execute[abi:nqe220100]<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct>>, jank::runtime::future(jank::runtime::oref<jank::runtime::object>)::$_0, 0ul>(__t=size=2, (null)=__integer_sequence<unsigned long, 0UL> @ 0x00000001703feebf) at thread.h:161:3
    frame #26: 0x00000001005d5e4c jank`void* std::__1::__thread_proxy[abi:nqe220100]<std::__1::tuple<std::__1::unique_ptr<std::__1::__thread_struct, std::__1::default_delete<std::__1::__thread_struct>>, jank::runtime::future(jank::runtime::oref<jank::runtime::object>)::$_0>>(__vp=0x0000600003acad20) at thread.h:169:3
    frame #27: 0x0000000100eae394 jank`GC_pthread_start_inner(sb=0x00000001703fef88, arg=0x000000016fdfafe8) at pthread_start.c:62:12
    frame #28: 0x0000000100ea6b78 jank`GC_call_with_stack_base(fn=(jank`GC_pthread_start_inner at pthread_start.c:52), arg=0x000000016fdfafe8) at misc.c:2539:12
    frame #29: 0x0000000100eb06d8 jank`GC_pthread_start(arg=0x000000016fdfafe8) at pthread_support.c:2814:10
    frame #30: 0x00000001838fbbc8 libsystem_pthread.dylib`_pthread_start + 136
* thread #13, stop reason = EXC_BAD_ACCESS (code=1, address=0x1000)
  * frame #0: 0x0000000100eb2300 jank`return_single_freelist(fl=0x0000000000001000, gfl=0x0000000101203ea8) at thread_local_alloc.c:60:11
    frame #1: 0x0000000100eb1bbc jank`return_freelists(fl=0x0000000106415828, gfl=0x0000000101203ea0) at thread_local_alloc.c:79:7
    frame #2: 0x0000000100eb1b20 jank`GC_destroy_thread_local(p=0x0000000106415828) at thread_local_alloc.c:166:5
    frame #3: 0x0000000100eafa78 jank`GC_unregister_my_thread_inner(me=0x0000000106415800) at pthread_support.c:2387:3
    frame #4: 0x0000000100eafd34 jank`GC_thread_exit_proc(arg=0x0000000106415800) at pthread_support.c:2639:3
    frame #5: 0x0000000100eae3c4 jank`GC_pthread_start_inner(sb=0x000000017048af88, arg=0x00000001703fc8f8) at pthread_start.c:77:3
    frame #6: 0x0000000100ea6b78 jank`GC_call_with_stack_base(fn=(jank`GC_pthread_start_inner at pthread_start.c:52), arg=0x00000001703fc8f8) at misc.c:2539:12
    frame #7: 0x0000000100eb06d8 jank`GC_pthread_start(arg=0x00000001703fc8f8) at pthread_support.c:2814:10
    frame #8: 0x00000001838fbbc8 libsystem_pthread.dylib`_pthread_start + 136

OS Version Information

MacOS Sequoia v15.7.3

I acknowledge that:

I have searched the jank repository (both open and closed Discussions and Issues) and confirm this is not a duplicate of an existing issue or discussion.
I have checked the "Preview" tab on all text fields to ensure that everything looks right, and have wrapped all configuration and code in code blocks with a group of three backticks (```) on separate lines.

jeaye · 2026-04-06T17:17:14Z

jeaye
Apr 6, 2026
Maintainer

Thanks for the report! What happens if you run jank with the GC disabled? Just export GC_DONT_GC=1 before running jank.

4 replies

shantanu-sardesai Apr 7, 2026
Collaborator Author

Interesting, disabling GC did make it work. I wonder why that works 🤔.

jeaye Apr 7, 2026
Maintainer

You included the stack trace from one thread, but it would be good to include:

What caused the crash (the debugger should provide you more info when the crash happens, like sigsegv at a specific address)
The stack trace of the main thread

shantanu-sardesai Apr 8, 2026
Collaborator Author

Updated the discussion description. Also added stack traces for other threads in a collapsible section, if that's also useful/helpful.

jeaye Apr 9, 2026
Maintainer

Thanks! This is apparently GC-related, but I don't know more right now. Investigation is required.

jeaye · 2026-07-07T19:18:56Z

jeaye
Jul 7, 2026
Maintainer

This is now fixed by #846

0 replies

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nREPL crash #722

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nREPL crash #722

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shantanu-sardesai Mar 28, 2026 Collaborator

Issue Description

Reproduction Steps

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Stack trace

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Replies: 2 comments · 4 replies

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jeaye Apr 6, 2026 Maintainer

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