[ruby-core:74530] [Ruby trunk Bug#12118] ruby2.3: Segfaults on m68k due to improper stack allocation

From: glaubitz@...
Date: 2016-03-24 09:30:44 UTC
List: ruby-core #74530
Issue #12118 has been updated by John Paul Adrian Glaubitz.


Here's the complete backtrace:

~~~
(sid-m68k-sbuild)root@z6:/build/ruby2.3-dCWwvL/ruby2.3-2.3.0# ./miniruby -I./lib -I. -I.ext/common  ./tool/runruby.rb --extout=.ext  -- --disable-gems -r./m68k-linux-gnu-fake ./tool/rbinstall.rb --make="/usr/bin/make" --dest-dir="/<<PKGBUILDDIR>>/debian/tmp" --extout=".ext" --mflags="-w" --make-flags="w -- DESTDIR=/<<PKGBUILDDIR>>/debian/tmp" --data-mode=0644 --prog-mode=0755 --installed-list .installed.list --mantype="doc"
qemu: Unsupported syscall: 352
qemu: Unsupported syscall: 352
installing binary commands:   /usr/bin
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/fileutils.rb:250: [BUG] Segmentation fault at 0x38000000
ruby 2.3.0p0 (2015-12-25) [m68k-linux-gnu]

-- Control frame information -----------------------------------------------
c:0013 p:---- s:0076 e:000075 CFUNC  :initialize
c:0012 p:---- s:0074 e:000073 CFUNC  :mkdir
c:0011 p:0034 s:0069 e:000068 METHOD /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/fileutils.rb:250
c:0010 p:0019 s:0064 e:000063 BLOCK  /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/fileutils.rb:214 [FINISH]
c:0009 p:---- s:0060 e:000059 CFUNC  :each
c:0008 p:0122 s:0057 e:000056 METHOD /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/fileutils.rb:211
c:0007 p:0046 s:0052 e:000051 METHOD ./tool/rbinstall.rb:191
c:0006 p:0158 s:0048 e:000047 METHOD ./tool/rbinstall.rb:304
c:0005 p:0012 s:0041 e:000040 BLOCK  ./tool/rbinstall.rb:342 [FINISH]
c:0004 p:0025 s:0039 e:000038 BLOCK  ./tool/rbinstall.rb:801 [FINISH]
c:0003 p:---- s:0035 e:000034 CFUNC  :each
c:0002 p:1387 s:0032 E:ffffe4f8 EVAL   ./tool/rbinstall.rb:798 [FINISH]
c:0001 p:0000 s:0002 E:ffffdee8 (none) [FINISH]

-- Ruby level backtrace information ----------------------------------------
./tool/rbinstall.rb:798:in `<main>'
./tool/rbinstall.rb:798:in `each'
./tool/rbinstall.rb:801:in `block in <main>'
./tool/rbinstall.rb:342:in `block in <main>'
./tool/rbinstall.rb:304:in `prepare'
./tool/rbinstall.rb:191:in `makedirs'
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/fileutils.rb:211:in `mkdir_p'
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/fileutils.rb:211:in `each'
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/fileutils.rb:214:in `block in mkdir_p'
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/fileutils.rb:250:in `fu_mkdir'
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/fileutils.rb:250:in `mkdir'
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/fileutils.rb:250:in `initialize'

-- C level backtrace information -------------------------------------------
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(rb_print_backtrace+0x24) [0xf67380b4] vm_dump.c:987
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(rb_vm_bugreport+0x7e) [0xf673814c] /usr/include/m68k-linux-gnu/bits/stdio2.h:97
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(rb_bug_context+0x58) [0xf66094a6] error.c:435
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(sigsegv+0x46) [0xf66c4334] signal.c:890
[0x800414d8]
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(iv_index_tbl_make+0x10) [0xf66fed4a] variable.c:1308
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(rb_ivar_set+0x86) [0xf6702428] variable.c:1340
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(syserr_initialize+0x152) [0xf660abb6] error.c:1525
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(vm_call0_body.constprop.112+0x1e6) [0xf673091e] vm_eval.c:119
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(rb_call0+0xd4) [0xf67313ee] vm_eval.c:609
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(rb_funcallv+0x3a) [0xf6731c14] /usr/include/m68k-linux-gnu/bits/string3.h:53
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(rb_obj_call_init+0x48) [0xf661008a] eval.c:1310
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(rb_class_new_instance+0x22) [0xf6660b3c] object.c:1856
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(rb_syserr_fail_path_in+0x7a) [0xf660b1e4] error.c:2208
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(rb_sys_fail_path_in+0x1e) [0xf660b23a] error.c:2191
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(dir_s_mkdir+0xb0) [0xf65f8028] dir.c:1132
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(vm_call_cfunc+0xf8) [0xf6726f18] vm_args.c:761
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(vm_call_method_each_type+0xd6) [0xf6733926] vm_insnhelper.c:2048
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(vm_call_general+0xba) [0xf673493e] vm.c:952
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(vm_exec_core+0xf8a) [0xf672b168] vm_insnhelper.c:210
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(vm_exec+0x68) [0xf672ec74] vm_insnhelper.c:1280
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(rb_yield+0x2b8) [0xf67350ce] vm_method.c:1905
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(rb_ary_each+0x40) [0xf65ca4a6] array.c:1815
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(vm_call_cfunc+0xf8) [0xf6726f18] vm_args.c:761
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(vm_call_method_each_type+0xd6) [0xf6733926] vm_insnhelper.c:2048
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(vm_call_general+0xba) [0xf673493e] vm.c:952
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(vm_exec_core+0xeee) [0xf672b0cc] insns.def:1032
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(vm_exec+0x68) [0xf672ec74] vm_insnhelper.c:1280
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(invoke_block_from_c_0+0x1d2) [0xf672f682] vm_args.c:762
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(vm_invoke_proc+0x84) [0xf672f71e] vm_eval.c:1584
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(rb_vm_invoke_proc+0x2a) [0xf672f7aa] vm_eval.c:1596
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(vm_call_opt_call+0x8c) [0xf672f864] vm.c:983
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(vm_call_method_each_type+0x390) [0xf6733be0] vm_insnhelper.c:2161
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(vm_call_general+0xba) [0xf673493e] vm.c:952
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(vm_exec_core+0xf8a) [0xf672b168] vm_insnhelper.c:210
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(vm_exec+0x68) [0xf672ec74] vm_insnhelper.c:1280
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(rb_yield+0x2b8) [0xf67350ce] vm_method.c:1905
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(rb_ary_each+0x60) [0xf65ca4c6] array.c:1815
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(vm_call_cfunc+0xf8) [0xf6726f18] vm_args.c:761
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(vm_call_method_each_type+0xd6) [0xf6733926] vm_insnhelper.c:2048
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(vm_call_general+0xba) [0xf673493e] vm.c:952
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(vm_exec_core+0xeee) [0xf672b0cc] insns.def:1032
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(vm_exec+0x68) [0xf672ec74] vm_insnhelper.c:1280
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(ruby_exec_internal+0x8c) [0xf660c3d2] eval.c:244
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(ruby_exec_node+0x18) [0xf660dc8a] eval.c:309
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/libruby-2.3.so.2.3.0(ruby_run_node+0x24) [0xf660fb8c] eval.c:977
/build/ruby2.3-dCWwvL/ruby2.3-2.3.0/ruby2.3(main+0x52) [0x80000736] main.c:36

-- Other runtime information -----------------------------------------------

* Loaded script: ./tool/rbinstall.rb

* Loaded features:

    0 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/rbconfig.rb
    1 enumerator.so
    2 thread.rb
    3 rational.so
    4 complex.so
    5 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/.ext/m68k-linux-gnu/enc/encdb.so
    6 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/.ext/m68k-linux-gnu/enc/trans/transdb.so
    7 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/unicode_normalize.rb
    8 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/m68k-linux-gnu-fake.rb
    9 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/.ext/m68k-linux-gnu/etc.so
   10 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/fileutils.rb
   11 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/shellwords.rb
   12 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/optparse.rb
   13 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/optparse/shellwords.rb
   14 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/ostruct.rb
   15 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/compatibility.rb
   16 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/defaults.rb
   17 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/deprecate.rb
   18 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/errors.rb
   19 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/version.rb
   20 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/requirement.rb
   21 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/platform.rb
   22 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/basic_specification.rb
   23 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/stub_specification.rb
   24 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/util/list.rb
   25 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/.ext/m68k-linux-gnu/stringio.so
   26 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/specification.rb
   27 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/exceptions.rb
   28 /usr/lib/ruby/vendor_ruby/rubygems/defaults/operating_system.rb
   29 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/core_ext/kernel_gem.rb
   30 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/monitor.rb
   31 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/core_ext/kernel_require.rb
   32 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems.rb
   33 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/.ext/m68k-linux-gnu/zlib.so
   34 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/.ext/m68k-linux-gnu/io/console.so
   35 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/user_interaction.rb
   36 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/command.rb
   37 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/.ext/m68k-linux-gnu/digest.so
   38 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/.ext/common/digest.rb
   39 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/.ext/m68k-linux-gnu/openssl.so
   40 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/.ext/common/openssl/bn.rb
   41 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/.ext/common/openssl/pkey.rb
   42 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/.ext/common/openssl/cipher.rb
   43 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/.ext/common/openssl/config.rb
   44 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/.ext/common/openssl/digest.rb
   45 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/.ext/common/openssl/x509.rb
   46 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/.ext/common/openssl/buffering.rb
   47 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/.ext/m68k-linux-gnu/io/nonblock.so
   48 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/.ext/common/openssl/ssl.rb
   49 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/.ext/common/openssl.rb
   50 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/security/policy.rb
   51 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/security/policies.rb
   52 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/security/trust_dir.rb
   53 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/security/signer.rb
   54 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/security.rb
   55 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/package/digest_io.rb
   56 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/package/source.rb
   57 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/package/file_source.rb
   58 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/package/io_source.rb
   59 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/package/old.rb
   60 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/package/tar_header.rb
   61 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/package/tar_reader/entry.rb
   62 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/package/tar_reader.rb
   63 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/package/tar_writer.rb
   64 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/package.rb
   65 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/ext/build_error.rb
   66 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/ext/builder.rb
   67 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/ext/configure_builder.rb
   68 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/delegate.rb
   69 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/tmpdir.rb
   70 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/tempfile.rb
   71 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/ext/ext_conf_builder.rb
   72 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/ext/rake_builder.rb
   73 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/ext/cmake_builder.rb
   74 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/ext.rb
   75 /build/ruby2.3-dCWwvL/ruby2.3-2.3.0/lib/rubygems/installer.rb

[NOTE]
You may have encountered a bug in the Ruby interpreter or extension libraries.
Bug reports are welcome.
For details: http://www.ruby-lang.org/bugreport.html

qemu: uncaught target signal 6 (Aborted) - core dumped
Aborted
(sid-m68k-sbuild)root@z6:/build/ruby2.3-dCWwvL/ruby2.3-2.3.0#
~~~

----------------------------------------
Bug #12118: ruby2.3: Segfaults on m68k due to improper stack allocation
https://bugs.ruby-lang.org/issues/12118#change-57654

* Author: John Paul Adrian Glaubitz
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: 
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
----------------------------------------
Hello!

On Motorola 680x0, ruby2.2 and ruby2.3 segfault when running the Ruby interpretor:

./miniruby -I./lib -I. -I.ext/common  ./tool/runruby.rb --extout=.ext  -- --disable-gems -r./m68k-linux-gnu-fake ./tool/rbinstall.rb --make="/usr/bin/make" --dest-dir="/<<PKGBUILDDIR>>/debian/tmp" --extout=".ext" --mflags="-w" --make-flags="w -- DESTDIR=/<<PKGBUILDDIR>>/debian/tmp" --data-mode=0644 --prog-mode=0755 --installed-list .installed.list --mantype="doc"
installing binary commands:   /usr/bin
/<<PKGBUILDDIR>>/lib/fileutils.rb:250: [BUG] Segmentation fault at 0x5f583332
ruby 2.3.0p0 (2015-12-25) [m68k-linux-gnu]

This happens while building ruby2.3 on Debian, for example [1].

Andreas Schwab has already investigated into this issue and he came up with the following patch for ruby2.2 [2]:

Index: ruby-2.2.3/thread_pthread.c
===================================================================
--- ruby-2.2.3.orig/thread_pthread.c
+++ ruby-2.2.3/thread_pthread.c
@@ -678,15 +678,14 @@ reserve_stack(volatile char *limit, size
 	limit += size;
 	if (limit > end) {
 	    size = limit - end;
-	    limit = alloca(size);
+	    limit = alloca(stack_check_margin+size);
 	    limit[stack_check_margin+size-1] = 0;
 	}
     }
     else {
 	limit -= size;
 	if (buf > limit) {
-	    limit = alloca(buf - limit);
-	    limit -= stack_check_margin;
+	    limit = alloca(buf - limit + stack_check_margin);
 	    limit[0] = 0;
 	}
     }

The same patch works fine on ruby2.3, I although I had to modify it so it still applies the same way in ruby2.3.
The bug can be reproduced in a qemu-m68k chroot environment which can be set up quite easily [3].

It would be very important for Debian's Motorola 680x0 port to get this issue fixed.

Thanks,
Adrian

> [1] https://buildd.debian.org/status/fetch.php?pkg=ruby2.3&arch=m68k&ver=2.3.0-2&stamp=1455092994
> [2] https://lists.debian.org/debian-68k/2015/11/msg00057.html
> [3] https://wiki.debian.org/M68k/sbuildQEMU

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