foo.twothreads

m.saper.info> gdb831 --args node build.js
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Reading symbols from node...
(No debugging symbols found in node)
(gdb) break compile_data
Function "compile_data" not defined.
Make breakpoint pending on future shared library load? (y or [n]) y
Breakpoint 1 (compile_data) pending.
(gdb) break sass_importer
Function "sass_importer" not defined.
Make breakpoint pending on future shared library load? (y or [n]) y
Breakpoint 2 (sass_importer) pending.
(gdb) run
Starting program: /usr/local/bin/node build.js
[New LWP 101988 of process 76889]
[New LWP 102002 of process 76889]
[New LWP 102024 of process 76889]
[New LWP 102042 of process 76889]
[New LWP 102049 of process 76889]
[New LWP 102050 of process 76889]
Starting 2 build(s)
Attempting to build. This will regularly trigger a SIGSEGV (segmentation fault) error. You may need to run this command multiple times to trigger it.
Attempting to build. This will regularly trigger a SIGSEGV (segmentation fault) error. You may need to run this command multiple times to trigger it.
[New LWP 102054 of process 76889]
[New LWP 102057 of process 76889]
[New LWP 102059 of process 76889]
[New LWP 102063 of process 76889]
[Switching to LWP 102063 of process 76889]

Thread 11 hit Breakpoint 1, compile_data (dctx=0x803192b00) at ../src/sass_context_wrapper.cpp:18
18	    sass_compile_data_context(dctx);
(gdb) print *dctx
$1 = {<Sass_Context> = {<Sass_Options> = {<Sass_Output_Options> = {<Sass_Inspect_Options> = {
          output_style = SASS_STYLE_NESTED, precision = 5, in_selector = false}, indent = 0x8056bc0c8 "  ", 
        linefeed = 0x8020cbef8 "\n", source_comments = false}, source_map_embed = false, source_map_contents = false, 
      source_map_file_urls = false, omit_source_map_url = false, is_indented_syntax_src = false, 
      input_path = 0x805343300 "/home/saper/sw/node-sass-segfault-repro/src/complex.scss", output_path = 0x0, 
      include_path = 0x8057773f0 "/home/saper/sw/node-sass-segfault-repro", plugin_path = 0x0, include_paths = 0x0, 
      plugin_paths = 0x0, source_map_file = 0x0, source_map_root = 0x0, c_functions = 0x0, c_importers = 0x8031a9e30, 
      c_headers = 0x0}, type = SASS_CONTEXT_DATA, output_string = 0x0, source_map_string = 0x0, error_status = 0, 
    error_json = 0x0, error_text = 0x0, error_message = 0x0, error_file = 0x0, error_line = 0, error_column = 0, 
    error_src = 0x0, included_files = 0x0}, 
  source_string = 0x8031d5620 "$base-color: #036;\n\n// this needs to run longer than the FaultyComponent.scss compiler\n@for $i from 1 through 10000 {\n  ul:nth-child(3n + #{$i}) {\n    background-color: lighten($base-color, $i % 20 * "..., 
  srcmap_string = 0x0}
(gdb) print *dctx->c_importers[0]
$2 = {importer = 0x8066f8090 <sass_importer(char const*, Sass_Importer*, Sass_Compiler*)>, priority = 0, 
  cookie = 0x803193d90}
(gdb) cont
Continuing.
[Switching to LWP 102057 of process 76889]

Thread 9 hit Breakpoint 1, compile_data (dctx=0x803192900) at ../src/sass_context_wrapper.cpp:18
18	    sass_compile_data_context(dctx);
(gdb) print *dctx
$3 = {<Sass_Context> = {<Sass_Options> = {<Sass_Output_Options> = {<Sass_Inspect_Options> = {
          output_style = SASS_STYLE_NESTED, precision = 5, in_selector = false}, indent = 0x8056bc0f8 "  ", 
        linefeed = 0x8056bc100 "\n", source_comments = false}, source_map_embed = false, source_map_contents = false, 
      source_map_file_urls = false, omit_source_map_url = false, is_indented_syntax_src = false, 
      input_path = 0x805343180 "/home/saper/sw/node-sass-segfault-repro/src/faulty.scss", output_path = 0x0, 
      include_path = 0x80575c0d0 "/home/saper/sw/node-sass-segfault-repro", plugin_path = 0x0, include_paths = 0x0, 
      plugin_paths = 0x0, source_map_file = 0x0, source_map_root = 0x0, c_functions = 0x0, c_importers = 0x8031a9c30, 
      c_headers = 0x0}, type = SASS_CONTEXT_DATA, output_string = 0x0, source_map_string = 0x0, error_status = 0, 
    error_json = 0x0, error_text = 0x0, error_message = 0x0, error_file = 0x0, error_line = 0, error_column = 0, 
    error_src = 0x0, included_files = 0x0}, source_string = 0x8057e3280 "@import './breakpoints.scss';\n", 
  srcmap_string = 0x0}
(gdb) print *dctx->c_importers[0]
$4 = {importer = 0x8066f8090 <sass_importer(char const*, Sass_Importer*, Sass_Compiler*)>, priority = 0, 
  cookie = 0x803193d20}
(gdb) cont
Continuing.
[Switching to LWP 102059 of process 76889]

Thread 10 hit Breakpoint 1, compile_data (dctx=0x803192a00) at ../src/sass_context_wrapper.cpp:18
18	    sass_compile_data_context(dctx);
(gdb) print *dctx
$5 = {<Sass_Context> = {<Sass_Options> = {<Sass_Output_Options> = {<Sass_Inspect_Options> = {
          output_style = SASS_STYLE_NESTED, precision = 5, in_selector = false}, indent = 0x8056bc128 "  ", 
        linefeed = 0x8056bc130 "\n", source_comments = false}, source_map_embed = false, source_map_contents = false, 
      source_map_file_urls = false, omit_source_map_url = false, is_indented_syntax_src = false, 
      input_path = 0x805c31f00 "/home/saper/sw/node-sass-segfault-repro/src/complex.scss", output_path = 0x0, 
      include_path = 0x805777270 "/home/saper/sw/node-sass-segfault-repro", plugin_path = 0x0, include_paths = 0x0, 
      plugin_paths = 0x0, source_map_file = 0x0, source_map_root = 0x0, c_functions = 0x0, c_importers = 0x8031a9c50, 
      c_headers = 0x0}, type = SASS_CONTEXT_DATA, output_string = 0x0, source_map_string = 0x0, error_status = 0, 
    error_json = 0x0, error_text = 0x0, error_message = 0x0, error_file = 0x0, error_line = 0, error_column = 0, 
    error_src = 0x0, included_files = 0x0}, 
  source_string = 0x8031d5700 "$base-color: #036;\n\n// this needs to run longer than the FaultyComponent.scss compiler\n@for $i from 1 through 10000 {\n  ul:nth-child(3n + #{$i}) {\n    background-color: lighten($base-color, $i % 20 * "..., 
  srcmap_string = 0x0}
(gdb) print *dctx->c_importers[0]
$6 = {importer = 0x8066f8090 <sass_importer(char const*, Sass_Importer*, Sass_Compiler*)>, priority = 0, 
  cookie = 0x803193a10}
(gdb) cont
Continuing.
[Switching to LWP 102057 of process 76889]

Thread 9 hit Breakpoint 2, sass_importer (cur_path=0x7fffdf1f5ff1 "./breakpoints.scss", cb=0x8057e3020, comp=0x805777210)
    at ../src/binding.cpp:10
10	  void* cookie = sass_importer_get_cookie(cb);
(gdb) next
11	  struct Sass_Import* previous = sass_compiler_get_last_import(comp);
(gdb) print *cookie
Attempt to dereference a generic pointer.
(gdb) print cookie
$7 = (void *) 0x803193d20
(gdb) cont
Continuing.
The expected error occurred. Exiting now which may trigger the segmentation fault error in the still running process(es).
[LWP 102042 of process 76889 exited]
[Switching to LWP 102054 of process 76889]

Thread 8 hit Breakpoint 1, compile_data (dctx=0x803192d00) at ../src/sass_context_wrapper.cpp:18
18	    sass_compile_data_context(dctx);
(gdb) print *dctx
$8 = {<Sass_Context> = {<Sass_Options> = {<Sass_Output_Options> = {<Sass_Inspect_Options> = {
          output_style = SASS_STYLE_NESTED, precision = 5, in_selector = false}, indent = 0x8056bc170 "  ", 
        linefeed = 0x8056bc570 "\n", source_comments = false}, source_map_embed = false, source_map_contents = false, 
      source_map_file_urls = false, omit_source_map_url = false, is_indented_syntax_src = false, 
      input_path = 0x8053430c0 "/home/saper/sw/node-sass-segfault-repro/src/faulty.scss", output_path = 0x0, 
      include_path = 0x8053d5ab0 "/home/saper/sw/node-sass-segfault-repro", plugin_path = 0x0, include_paths = 0x0, 
      plugin_paths = 0x0, source_map_file = 0x0, source_map_root = 0x0, c_functions = 0x0, c_importers = 0x8031a9d00, 
      c_headers = 0x0}, type = SASS_CONTEXT_DATA, output_string = 0x0, source_map_string = 0x0, error_status = 0, 
    error_json = 0x0, error_text = 0x0, error_message = 0x0, error_file = 0x0, error_line = 0, error_column = 0, 
    error_src = 0x0, included_files = 0x0}, source_string = 0x80570b900 "@import './breakpoints.scss';\n", 
  srcmap_string = 0x0}
(gdb) print *dctx->c_importers[0]
$9 = {importer = 0x8066f8090 <sass_importer(char const*, Sass_Importer*, Sass_Compiler*)>, priority = 0, 
  cookie = 0x8031939a0}
(gdb) cont
Continuing.

Thread 8 hit Breakpoint 2, sass_importer (cur_path=0x7fffdf3f6ff1 "./breakpoints.scss", cb=0x805c43600, comp=0x805dc90c0)
    at ../src/binding.cpp:10
10	  void* cookie = sass_importer_get_cookie(cb);
(gdb) next
11	  struct Sass_Import* previous = sass_compiler_get_last_import(comp);
(gdb) print cookie
$10 = (void *) 0x8031939a0
(gdb) cont
Continuing.
[LWP 101988 of process 76889 exited]
[LWP 102002 of process 76889 exited]
[LWP 102049 of process 76889 exited]
[LWP 102024 of process 76889 exited]
[LWP 102057 of process 76889 exited]
[LWP 102059 of process 76889 exited]
[LWP 102063 of process 76889 exited]
^C
Thread 1 received signal SIGINT, Interrupt.
[Switching to LWP 101132 of process 76889]
_umtx_op_err () at /usr/src/lib/libthr/arch/amd64/amd64/_umtx_op_err.S:37
37	RSYSCALL_ERR(_umtx_op)
(gdb) info thread
  Id   Target Id                   Frame 
* 1    LWP 101132 of process 76889 _umtx_op_err () at /usr/src/lib/libthr/arch/amd64/amd64/_umtx_op_err.S:37
  7    LWP 102050 of process 76889 _umtx_op () at _umtx_op.S:3
  8    LWP 102054 of process 76889 _umtx_op_err () at /usr/src/lib/libthr/arch/amd64/amd64/_umtx_op_err.S:37
(gdb) thread 8
[Switching to thread 8 (LWP 102054 of process 76889)]
#0  _umtx_op_err () at /usr/src/lib/libthr/arch/amd64/amd64/_umtx_op_err.S:37
37	RSYSCALL_ERR(_umtx_op)
(gdb) bt
#0  _umtx_op_err () at /usr/src/lib/libthr/arch/amd64/amd64/_umtx_op_err.S:37
#1  0x0000000802b91740 in _thr_umtx_timedwait_uint (mtx=0x8031e3098, id=<optimized out>, clockid=<optimized out>, 
    abstime=<optimized out>, shared=<optimized out>) at /usr/src/lib/libthr/thread/thr_umtx.c:236
#2  0x0000000802b9b348 in cond_wait_user (cvp=<optimized out>, mp=0x803168300, abstime=0x0, cancel=1)
    at /usr/src/lib/libthr/thread/thr_cond.c:307
#3  cond_wait_common (cond=<optimized out>, mutex=<optimized out>, abstime=0x0, cancel=1)
    at /usr/src/lib/libthr/thread/thr_cond.c:367
#4  0x0000000802113ad9 in uv_cond_wait () from /usr/local/lib/libuv.so.1
#5  0x00000008066faf3b in CallbackBridge<Sass_Import**, void*>::operator() (this=0x8031939a0, argv=...)
    at ../src/callback_bridge.h:136
#6  0x00000008066f815f in sass_importer (cur_path=<optimized out>, cb=<optimized out>, comp=<optimized out>)
    at ../src/binding.cpp:19
#7  0x0000000806724090 in Sass::Context::call_loader (this=0x805c38000, load_path="./breakpoints.scss", 
    ctx_path=0x805c3c480 "/home/saper/sw/node-sass-segfault-repro/src/faulty.scss", pstate=..., imp=0x805c40480, 
    importers=..., only_one=<optimized out>) at ../src/libsass/src/context.cpp:436
#8  0x00000008068165fe in Sass::Context::call_importers (this=0x805c38000, 
    load_path=<error reading variable: Cannot access memory at address 0x6b616572622f2e24>, 
    ctx_path=0x805c3c480 "/home/saper/sw/node-sass-segfault-repro/src/faulty.scss", pstate=..., imp=0x805c40480)
    at ../src/libsass/src/context.hpp:34
#9  Sass::Parser::parse_import (this=0x7fffdf3f7950) at ../src/libsass/src/parser.cpp:376
#10 0x000000080680fc40 in Sass::Parser::parse_block_node (this=0x7fffdf3f7950, is_root=true)
    at ../src/libsass/src/parser.cpp:249
#11 0x000000080680df01 in Sass::Parser::parse_block_nodes (this=0x7fffdf3f7950, is_root=<optimized out>)
    at ../src/libsass/src/parser.cpp:197
#12 0x000000080680d23d in Sass::Parser::parse (this=0x7fffdf3f7950) at ../src/libsass/src/parser.cpp:123
#13 0x0000000806721e7c in Sass::Context::register_resource (this=0x805c38000, inc=..., res=...)
    at ../src/libsass/src/context.cpp:324
#14 0x0000000806726add in Sass::Data_Context::parse (this=<optimized out>) at ../src/libsass/src/context.cpp:636
#15 0x0000000806716efd in Sass::sass_parse_block (compiler=<optimized out>) at ../src/libsass/src/sass_context.cpp:234
#16 sass_compiler_parse (compiler=<optimized out>) at ../src/libsass/src/sass_context.cpp:483
#17 0x0000000806716b5a in sass_compile_context (c_ctx=0x803192d00, cpp_ctx=<optimized out>)
    at ../src/libsass/src/sass_context.cpp:371
#18 0x0000000802103965 in ?? () from /usr/local/lib/libuv.so.1
#19 0x0000000802b8f786 in thread_start (curthread=0x8053f4a00) at /usr/src/lib/libthr/thread/thr_create.c:292
#20 0x0000000000000000 in ?? ()
Backtrace stopped: Cannot access memory at address 0x7fffdf3f8000
(gdb)