neovim crashing (on linux)

FIX.md

Rebuild the luv package with the patch at luvit/luv#598 applied. See PKGBUILD for an example.

neovim_0.7_backtrace.txt

#0  0x00007f2d7e70134c in __pthread_kill_implementation () from /usr/lib/libc.so.6
#1  0x00007f2d7e6b44b8 in raise () from /usr/lib/libc.so.6
#2  0x00007f2d7e69e534 in abort () from /usr/lib/libc.so.6
#3  0x00007f2d7e6f5397 in __libc_message () from /usr/lib/libc.so.6
#4  0x00007f2d7e70b33c in malloc_printerr () from /usr/lib/libc.so.6
#5  0x00007f2d7e70d65c in _int_free () from /usr/lib/libc.so.6
#6  0x00007f2d7e70fbe3 in free () from /usr/lib/libc.so.6
#7  0x00007f2d7ea6b050 in uv__free (ptr=ptr@entry=0x557a7ceaa000) at src/uv-common.c:88
#8  0x00007f2d7ea71cd1 in uv__fs_closedir (req=<optimized out>) at src/unix/fs.c:647
#9  uv__fs_work (w=<optimized out>) at src/unix/fs.c:1725
#10 0x00007f2d7ea74308 in uv_fs_closedir (loop=<optimized out>, req=0x7f2d7cb02a98, dir=<optimized out>, cb=<optimized out>)
    at src/unix/fs.c:2054
#11 0x00007f2d7eaa76b5 in luv_fs_closedir (L=0x7f2d7eada380) at /usr/src/debug/luv-1.43.0-0/src/fs.c:940
#12 0x00007f2d7e885f06 in lj_BC_FUNCC () at buildvm_x86.dasc:857
#13 0x00007f2d7e89878a in lua_pcall (L=L@entry=0x7f2d7eada380, nargs=nargs@entry=0, nresults=nresults@entry=1, errfunc=errfunc@entry=-2)
    at /build/luajit/src/luajit-2.0-3ee3c9c/src/lj_api.c:1116
#14 0x0000557a7a391841 in nlua_pcall (lstate=0x7f2d7eada380, nargs=0, nresults=1)
    at /usr/src/debug/neovim-0.7.0/src/nvim/lua/executor.c:129
#15 0x0000557a7a39f45b in nlua_typval_exec (lcmd=<optimized out>, lcmd_len=<optimized out>, name=<optimized out>, args=<optimized out>,
    argcount=0, special=false, ret_tv=0x7ffe2e747ac0) at /usr/src/debug/neovim-0.7.0/src/nvim/lua/executor.c:1230
#16 0x0000557a7a39fce3 in nlua_typval_exec (ret_tv=0x7ffe2e747ac0, special=false, argcount=0, args=0x7ffe2e747560,
    name=0x557a7a553f11 "v:lua", lcmd_len=38,
    lcmd=0x557a7a63c5e0 <IObuff> "return require'feline'.statusline(...)\"nvim-treesitter.fold\".get_fold_indic(1))))A))ur_job, line 4")
    at /usr/src/debug/neovim-0.7.0/src/nvim/memory.c:122
#17 nlua_typval_call (str=<optimized out>, len=26, args=0x7ffe2e747560, argcount=0, ret_tv=0x7ffe2e747ac0)
    at /usr/src/debug/neovim-0.7.0/src/nvim/lua/executor.c:1186
#18 0x0000557a7a30f042 in call_func (funcname=funcname@entry=0x7ffe2e747e26 "require'feline'.statusline()", len=<optimized out>,
    len@entry=26, rettv=rettv@entry=0x7ffe2e747ac0, argcount_in=argcount_in@entry=0, argvars_in=argvars_in@entry=0x7ffe2e747560,
    funcexe=funcexe@entry=0x7ffe2e747710) at /usr/src/debug/neovim-0.7.0/src/nvim/eval/userfunc.c:1525
#19 0x0000557a7a30f7dd in get_func_tv (name=0x7ffe2e747e26 "require'feline'.statusline()", len=26, rettv=0x7ffe2e747ac0,
    arg=0x7ffe2e747a70, funcexe=0x7ffe2e747710) at /usr/src/debug/neovim-0.7.0/src/nvim/eval/userfunc.c:458
#20 0x0000557a7a2cd9cf in call_func_rettv (arg=arg@entry=0x7ffe2e747a70, rettv=rettv@entry=0x7ffe2e747ac0, evaluate=evaluate@entry=true,
    selfdict=selfdict@entry=0x0, basetv=basetv@entry=0x0, lua_funcname=lua_funcname@entry=0x7ffe2e747e26 "require'feline'.statusline()")
    at /usr/src/debug/neovim-0.7.0/src/nvim/eval.c:4353
#21 0x0000557a7a2d58c7 in handle_subscript (arg=<optimized out>, rettv=<optimized out>, evaluate=1, verbose=1,
    start_leader=0x7ffe2e747e20 "v:lua.require'feline'.statusline()", end_leaderp=0x7ffe2e747878)
    at /usr/src/debug/neovim-0.7.0/src/nvim/eval.c:8602
#22 0x0000557a7a2c5bd6 in eval7 (arg=arg@entry=0x7ffe2e747a70, rettv=rettv@entry=0x7ffe2e747ac0, evaluate=evaluate@entry=1,
    want_string=want_string@entry=0) at /usr/src/debug/neovim-0.7.0/src/nvim/eval.c:4250
#23 0x0000557a7a2c6a34 in eval6 (arg=arg@entry=0x7ffe2e747a70, rettv=rettv@entry=0x7ffe2e747ac0, evaluate=evaluate@entry=1,
    want_string=want_string@entry=0) at /usr/src/debug/neovim-0.7.0/src/nvim/eval.c:3912
#24 0x0000557a7a2c6db4 in eval5 (evaluate=1, rettv=0x7ffe2e747ac0, arg=0x7ffe2e747a70)
--Type <RET> for more, q to quit, c to continue without paging--
    at /usr/src/debug/neovim-0.7.0/src/nvim/eval.c:3737
#25 eval4 (evaluate=1, rettv=0x7ffe2e747ac0, arg=0x7ffe2e747a70) at /usr/src/debug/neovim-0.7.0/src/nvim/eval.c:3633
#26 eval3 (arg=arg@entry=0x7ffe2e747a70, rettv=rettv@entry=0x7ffe2e747ac0, evaluate=evaluate@entry=1)
    at /usr/src/debug/neovim-0.7.0/src/nvim/eval.c:3554
#27 0x0000557a7a2c6fe5 in eval2 (evaluate=1, rettv=0x7ffe2e747ac0, arg=0x7ffe2e747a70)
    at /usr/src/debug/neovim-0.7.0/src/nvim/eval.c:3485
#28 eval1 (arg=arg@entry=0x7ffe2e747a70, rettv=rettv@entry=0x7ffe2e747ac0, evaluate=evaluate@entry=1)
    at /usr/src/debug/neovim-0.7.0/src/nvim/eval.c:3411
#29 0x0000557a7a2c9ed1 in eval0 (arg=0x7ffe2e747e20 "v:lua.require'feline'.statusline()", rettv=rettv@entry=0x7ffe2e747ac0,
    nextcmd=0x7ffe2e747c68, evaluate=evaluate@entry=1) at /usr/src/debug/neovim-0.7.0/src/nvim/eval.c:3370
#30 0x0000557a7a2cad7b in eval_to_string (arg=<optimized out>, nextcmd=<optimized out>, convert=convert@entry=false)
    at /usr/src/debug/neovim-0.7.0/src/nvim/eval.c:884
#31 0x0000557a7a2cb0d2 in eval_to_string_safe (arg=<optimized out>, nextcmd=<optimized out>, use_sandbox=<optimized out>)
    at /usr/src/debug/neovim-0.7.0/src/nvim/eval.c:924
#32 0x0000557a7a28bdfc in build_stl_str_hl (wp=0x557a7ca85dc0, out=0x7ffe2e747e20 "v:lua.require'feline'.statusline()", outlen=4096,
    fmt=0x557a7ce7ede0 "%{%v:lua.require'feline'.statusline()%}", use_sandbox=0, fillchar=32, maxwidth=<optimized out>,
    hltab=0x7ffe2e747e18, tabtab=0x7ffe2e747e10) at /usr/src/debug/neovim-0.7.0/src/nvim/buffer.c:3928
#33 0x0000557a7a4758ea in win_redr_custom (wp=wp@entry=0x557a7ca85dc0, draw_ruler=draw_ruler@entry=false)
    at /usr/src/debug/neovim-0.7.0/src/nvim/screen.c:5519
#34 0x0000557a7a475d67 in redraw_custom_statusline (wp=0x557a7ca85dc0) at /usr/src/debug/neovim-0.7.0/src/nvim/screen.c:5265
#35 0x0000557a7a478faa in showruler (always=<optimized out>) at /usr/src/debug/neovim-0.7.0/src/nvim/screen.c:7175
#36 0x0000557a7a3df8d6 in normal_redraw (s=0x7ffe2e748f20) at /usr/src/debug/neovim-0.7.0/src/nvim/message.c:2491
#37 normal_check (state=0x7ffe2e748f20) at /usr/src/debug/neovim-0.7.0/src/nvim/normal.c:1381
#38 0x0000557a7a4bb0e0 in state_enter (s=0x7ffe2e748f20) at /usr/src/debug/neovim-0.7.0/src/nvim/state.c:31
#39 0x0000557a7a3df390 in normal_enter (cmdwin=<optimized out>, noexmode=<optimized out>)
    at /usr/src/debug/neovim-0.7.0/src/nvim/normal.c:463
#40 0x0000557a7a239245 in main (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/neovim-0.7.0/src/nvim/main.c:574

neovim_version.txt

NVIM v0.7.0
Build type: Release
LuaJIT 2.1.0-beta3
Compiled by builduser

Features: +acl +iconv +tui
See ":help feature-compile"

   system vimrc file: "$VIM/sysinit.vim"
  fall-back for $VIM: "/usr/share/nvim"

Run :checkhealth for more info

----

Arch Linux
$TERM = alacritty
Running in alacritty
Installed via official package (`pacman -S neovim`)

opendir-race-condition-fix.diff

diff --git a/docs.md b/docs.md
index 75d54f6b..9a9a7208 100644
--- a/docs.md
+++ b/docs.md
@@ -2975,14 +2975,14 @@ Copies a file from path to new_path. If the `flags` parameter is omitted, then t
 - `path`: `string`
 - `callback`: `callable` (async version) or `nil` (sync version)
   - `err`: `nil` or `string`
-  - `dir`: `uv_dir_t userdata` or `nil`
+  - `dir`: `luv_dir_t userdata` or `nil`
 - `entries`: `integer` or `nil`
 
 Opens path as a directory stream. Returns a handle that the user can pass to
 `uv.fs_readdir()`. The `entries` parameter defines the maximum number of entries
 that should be returned by each call to `uv.fs_readdir()`.
 
-**Returns (sync version):** `uv_dir_t userdata` or `fail`
+**Returns (sync version):** `luv_dir_t userdata` or `fail`
 
 **Returns (async version):** `uv_fs_t userdata`
 
@@ -2991,12 +2991,12 @@ that should be returned by each call to `uv.fs_readdir()`.
 > method form `dir:readdir([callback])`
 
 **Parameters:**
-- `dir`: `uv_dir_t userdata`
+- `dir`: `luv_dir_t userdata`
 - `callback`: `callable` (async version) or `nil` (sync version)
   - `err`: `nil` or `string`
   - `entries`: `table` or `nil` (see below)
 
-Iterates over the directory stream `uv_dir_t` returned by a successful
+Iterates over the directory stream `luv_dir_t` returned by a successful
 `uv.fs_opendir()` call. A table of data tables is returned where the number
 of entries `n` is equal to or less than the `entries` parameter used in
 the associated `uv.fs_opendir()` call.
@@ -3013,7 +3013,7 @@ the associated `uv.fs_opendir()` call.
 > method form `dir:closedir([callback])`
 
 **Parameters:**
-- `dir`: `uv_dir_t userdata`
+- `dir`: `luv_dir_t userdata`
 - `callback`: `callable` (async version) or `nil` (sync version)
   - `err`: `nil` or `string`
   - `success`: `boolean` or `nil`
diff --git a/src/fs.c b/src/fs.c
index 0c36dccd..c7c69923 100644
--- a/src/fs.c
+++ b/src/fs.c
@@ -17,6 +17,13 @@
 
 #include "private.h"
 
+#if LUV_UV_VERSION_GEQ(1, 28, 0)
+typedef struct {
+  uv_dir_t* handle;
+  int dirents_ref; /* handle has been closed if this is LUA_NOREF */
+} luv_dir_t;
+#endif
+
 static uv_fs_t* luv_check_fs(lua_State* L, int index) {
   uv_fs_t* req = (uv_fs_t*)luaL_checkudata(L, index, "uv_req");
   luaL_argcheck(L, req->type == UV_FS && req->data, index, "Expected uv_fs_t");
@@ -333,14 +340,15 @@ static int push_fs_result(lua_State* L, uv_fs_t* req) {
       luaL_unref(L, LUA_REGISTRYINDEX, data->data_ref);
       data->data_ref = LUA_NOREF;
 
-      (*(void**)lua_newuserdata(L, sizeof(void*))) = dir;
-      lua_pushfstring(L, "uv_dir:%p", dir);
-      dir->dirents = lua_newuserdata(L, sizeof(uv_dirent_t)*nentries);
-      dir->nentries = nentries;
-      lua_rawset(L, LUA_REGISTRYINDEX);
+      luv_dir_t* luv_dir = lua_newuserdata(L, sizeof(*luv_dir));
       luaL_getmetatable(L, "uv_dir");
       lua_setmetatable(L, -2);
 
+      luv_dir->handle = dir;
+      luv_dir->handle->dirents = lua_newuserdata(L, sizeof(uv_dirent_t)*nentries);
+      luv_dir->dirents_ref = luaL_ref(L, LUA_REGISTRYINDEX);
+      luv_dir->handle->nentries = nentries;
+
       return 1;
     }
     case UV_FS_READDIR: {
@@ -888,8 +896,8 @@ static int luv_fs_copyfile(lua_State*L) {
 #endif
 
 #if LUV_UV_VERSION_GEQ(1, 28, 0)
-static uv_dir_t* luv_check_dir(lua_State* L, int idx) {
-  uv_dir_t* dir = *(uv_dir_t**)luaL_checkudata(L, idx, "uv_dir");
+static luv_dir_t* luv_check_dir(lua_State* L, int idx) {
+  luv_dir_t* dir = (luv_dir_t*)luaL_checkudata(L, idx, "uv_dir");
   return dir;
 }
 
@@ -911,45 +919,44 @@ static int luv_fs_opendir(lua_State* L) {
 static int luv_fs_readdir(lua_State* L) {
   luv_ctx_t* ctx = luv_context(L);
   uv_fs_t *req;
-  uv_dir_t* dir = luv_check_dir(L, 1);
+  luv_dir_t* dir = luv_check_dir(L, 1);
   int ref = luv_check_continuation(L, 2);
 
   req = (uv_fs_t*)lua_newuserdata(L, uv_req_size(UV_FS));
   req->data = luv_setup_req(L, ctx, ref);
-  FS_CALL(readdir, req, dir);
+  FS_CALL(readdir, req, dir->handle);
 }
 
 static int luv_fs_closedir(lua_State* L) {
   luv_ctx_t* ctx = luv_context(L);
-  uv_dir_t* dir = luv_check_dir(L, 1);
+  luv_dir_t* dir = luv_check_dir(L, 1);
   int ref = luv_check_continuation(L, 2);
+
+  luaL_unref(L, LUA_REGISTRYINDEX, dir->dirents_ref);
+  dir->dirents_ref = LUA_NOREF;
+
   uv_fs_t *req = (uv_fs_t*)lua_newuserdata(L, uv_req_size(UV_FS));
   req->data = luv_setup_req(L, ctx, ref);
-  lua_pushfstring(L, "uv_dir:%p", dir);
-  lua_pushnil(L);
-  lua_rawset(L, LUA_REGISTRYINDEX);
-  FS_CALL(closedir, req, dir);
+  FS_CALL(closedir, req, dir->handle);
 }
 
 static int luv_fs_dir_tostring(lua_State* L) {
-  uv_dir_t* dir = luv_check_dir(L, 1);
+  luv_dir_t* dir = luv_check_dir(L, 1);
   lua_pushfstring(L, "uv_dir_t: %p", dir);
   return 1;
 }
 
 static int luv_fs_dir_gc(lua_State* L) {
-  uv_dir_t* dir = luv_check_dir(L, 1);
-  lua_pushfstring(L, "uv_dir:%p", dir);
-  lua_rawget(L, LUA_REGISTRYINDEX);
-  if (!lua_isnil(L, -1)) {
+  luv_dir_t* dir = luv_check_dir(L, 1);
+  if (dir->dirents_ref != LUA_NOREF) {
     uv_fs_t req;
     luv_ctx_t* ctx = luv_context(L);
 
-    uv_fs_closedir(ctx->loop, &req, dir, NULL);
+    luaL_unref(L, LUA_REGISTRYINDEX, dir->dirents_ref);
+    dir->dirents_ref = LUA_NOREF;
+
+    uv_fs_closedir(ctx->loop, &req, dir->handle, NULL);
     uv_fs_req_cleanup(&req);
-    lua_pushfstring(L, "uv_dir:%p", dir);
-    lua_pushnil(L);
-    lua_rawset(L, LUA_REGISTRYINDEX);
   }
   lua_pop(L, 1);

PKGBUILD

# Maintainer: Sven-Hendrik Haase <svenstaro@archlinux.org>
# Contributor: Jurica Bradarić <jbradaric@gmail.com>
# Contributor: jprjr <john@jrjrtech.com>

pkgname=('libluv' 'lua-luv' 'lua51-luv' 'lua52-luv' 'lua53-luv')
pkgbase=libluv
pkgver=1.43.0_0_nog
_pkgver=1.43.0-0
pkgrel=2
pkgdesc='Bare libuv bindings for lua (Patched for crashing)'
arch=('x86_64')
url='https://github.com/luvit/luv'
license=('APACHE')
depends=('libuv')
makedepends=('cmake' 'libuv' 'ninja' 'luajit' 'lua>=5.4.0' 'lua<5.5.0' 'lua51' 'lua52' 'lua53')
source=("https://github.com/luvit/luv/releases/download/${_pkgver}/luv-${_pkgver}.tar.gz" "opendir-race-condition-fix.diff")
sha256sums=('567a6f3dcdcf8a9b54ddc57ffef89d1e950d72832b85ee81c8c83a9d4e0e9de2'
            'ee3cc69e88f7b502cf0c8c34091c768c5c5802792481f2614eb9695d4eadb094')

prepare() {
  cd "luv-${_pkgver}/"
  patch -p1 -i ../opendir-race-condition-fix.diff
}

build() {
    # build per-lua versions
    for ver in 5.1 5.2 5.3 5.4; do
      incdir="/usr/include/lua${ver}"
      if [ "$ver" = "5.4" ] ; then
        incdir="/usr/include"
      fi
      cmake -GNinja \
        -Bbuild-lua${ver//./} \
        -DLUA=/usr/bin/lua${ver} \
        -DLUA_INCDIR=${incdir} \
        -DLUADIR=/usr/share/lua/${ver} \
        -DLIBDIR=/usr/lib/lua/${ver} \
        -DWITH_SHARED_LIBUV=ON \
        -DLUA_BUILD_TYPE=System \
        -DCMAKE_INSTALL_PREFIX=/usr \
        "luv-${_pkgver}"
      ninja -C "build-lua${ver//./}"
    done

    # build shared library version
    cmake -GNinja \
      -Bbuild \
      -DWITH_SHARED_LIBUV=ON \
      -DLUA_BUILD_TYPE=System \
      -DBUILD_MODULE=OFF \
      -DBUILD_SHARED_LIBS=ON \
      -DCMAKE_INSTALL_PREFIX=/usr \
      "luv-${_pkgver}"
    ninja -C "build"
}

package_libluv() {
    depends+=('luajit')
    provides+=('libluv')
    DESTDIR="${pkgdir}" ninja -C "build" install
}

package_lua-luv() {
    pkgdesc+=' - Lua module'
    depends+=('lua')
    DESTDIR="${pkgdir}" ninja -C "build-lua54" install
}

package_lua51-luv() {
    pkgdesc+=' - Lua 5.1 module'
    depends+=('lua51')
    DESTDIR="${pkgdir}" ninja -C "build-lua51" install
}

package_lua52-luv() {
    pkgdesc+=' - Lua 5.2 module'
    depends+=('lua52')
    DESTDIR="${pkgdir}" ninja -C "build-lua52" install
}

package_lua53-luv() {
    pkgdesc+=' - Lua 5.3 module'
    depends+=('lua53')
    DESTDIR="${pkgdir}" ninja -C "build-lua53" install
}

# vim:set ts=2 sw=2 et: