Issues

• Runtime error: undefined symbol error (v6.0.12 vs v6.0.5)

  emscripten-core/emscripten#27961 · Filter by author tdrz opened on Oct 13, 2026

• emcc: warning: USE_PTHREADS is deprecated (prefer the standard -pthread flag). Please open a bug if you have a continuing need for this setting

  emscripten-core/emscripten#27960 · Filter by author tdrz opened on Oct 13, 2026

• Deprecation proposal for MEMORY64=2

  deprecation
  emscripten-core/emscripten#27952 · Filter by author sbc100 opened on Oct 12, 2026

• LEGACY_GL_EMULATION: generated fixed-function fragment shaders use mediump — fp16 overflow where mediump is half precision

  Desktop OpenGL emulation
  emscripten-core/emscripten#27948 · Filter by author TheTomBritton opened on Oct 11, 2026

• LEGACY_GL_EMULATION: 4-component texture coordinates ignore q — no projective divide in generated samplers

  Desktop OpenGL emulation
  emscripten-core/emscripten#27947 · Filter by author TheTomBritton opened on Oct 11, 2026

• LEGACY_GL_EMULATION: duplicate-texture-load regex truncates sample expressions when a texture matrix is active (invalid GLSL for COMBINE shaders)

  Desktop OpenGL emulation
  emscripten-core/emscripten#27946 · Filter by author TheTomBritton opened on Oct 11, 2026

• LEGACY_GL_EMULATION: planar client-side vertex arrays are not re-read on later glDrawArrays — stale vertex data is drawn

  Desktop OpenGL emulation
  emscripten-core/emscripten#27945 · Filter by author TheTomBritton opened on Oct 11, 2026
  1

• test_fetch_to_memory_async (and other fetch tests) have recently become flaky under chrome in github CI

  flaky test
  emscripten-core/emscripten#27942 · Filter by author sbc100 opened on Oct 9, 2026

• Link failure with -sWASMFS -flto=thin

  emscripten-core/emscripten#27939 · Filter by author paradust7 opened on Oct 9, 2026

• feat: upgrade to mimalloc-pprof 1.1.0 for lower memory use and heap profiling

  emscripten-core/emscripten#27920 · Filter by author zackees opened on Oct 7, 2026

• Update the Emscripten SDL port from 3.4.2 to 3.4.4

  emscripten-core/emscripten#27906 · Filter by author qwertdim opened on Oct 7, 2026
  1

• Feature request: support package.json conditional exports

  emscripten-core/emscripten#27904 · Filter by author jeremy-code opened on Oct 7, 2026
  1

• emscripten_webgl_destroy_context_before_on_calling_thread is never invoked due to missing $ prefix check

  emscripten-core/emscripten#27891 · Filter by author sbc100 opened on Oct 6, 2026

• NODERAWSOCKETS: gethostbyname() still returns fake 172.29.x.y addresses that node:net cannot reach

  emscripten-core/emscripten#27887 · Filter by author JosepMariaBlasco opened on Oct 6, 2026

• WasmFS: ProxyWorker's 50 ms heartbeat outlives its thread and runs the freed queue on a pooled Worker (Assertion failed: pthread_self() in emscripten_proxy_execute_queue)

  emscripten-core/emscripten#27858 · Filter by author typedrat opened on Oct 2, 2026

• [WasmFS] Node backend can't open a write-only (0200) file for writing

  emscripten-core/emscripten#27847 · Filter by author typedrat opened on Oct 1, 2026

• dlopen() skips a running thread whose pthread_t was reused from a just-joined thread ("table index is out of bounds")

  emscripten-core/emscripten#27841 · Filter by author typedrat opened on Oct 1, 2026

• Threads that exit unjoined leak their stack and Worker while the main thread is blocked

  emscripten-core/emscripten#27840 · Filter by author typedrat opened on Oct 1, 2026

• Deprecation proposal for SCons support (emscons)

  deprecation
  emscripten-core/emscripten#27835 · Filter by author sbc100 opened on Oct 1, 2026
  6

  

• WasmFS: mkdir()/open(O_CREAT) report EIO for any backend failure (e.g. EACCES from the Node backend)

  emscripten-core/emscripten#27832 · Filter by author typedrat opened on Oct 1, 2026

• Pipes are unbounded: a non-blocking writer never gets EAGAIN (and WasmFS runs out of memory)

  emscripten-core/emscripten#27831 · Filter by author typedrat opened on Oct 1, 2026

• dlsym(RTLD_NEXT, ...) aborts with "Tried to dlsym() from an unopened handle: -1" under MAIN_MODULE

  emscripten-core/emscripten#27830 · Filter by author typedrat opened on Oct 1, 2026
  2

• WasmFS: chdir() and path lookup ignore directory search (execute) permission

  emscripten-core/emscripten#27829 · Filter by author typedrat opened on Oct 1, 2026

• WasmFS: poll() does not report POLLIN for an empty regular file, /dev/null or /dev/random

  emscripten-core/emscripten#27828 · Filter by author typedrat opened on Oct 1, 2026

• WasmFS: open() with O_NOCTTY (or O_SYNC/O_DSYNC) aborts on the flag assertion in doOpen

  emscripten-core/emscripten#27826 · Filter by author typedrat opened on Oct 1, 2026