Bug #17949: [SOLARIS11, SPARC, SEGFAULT] generating encdb.h

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: git
• Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN

[tankf33der (Mike P)]

The same latest Solaris 11 and ruby, next crash while compiling:

$ gmake
...
...
compiling time.c
compiling version.c
compiling vm.c
compiling vm_trace.c
compiling coroutine/ucontext/Context.c
compiling enc/trans/newline.c
linking miniruby
./revision.h unchanged
generating encdb.h
/export/home/cddr/ruby/lib/cgi/util.rb:61: [BUG] Segmentation fault at 0x0000000000000000
ruby 3.1.0dev (2021-06-11) [sparc-solaris2.11]

-- Control frame information -----------------------------------------------
c:0008 p:---- s:0042 e:000041 CFUNC :require
c:0007 p:0031 s:0037 e:000036 CLASS /export/home/cddr/ruby/lib/cgi/util.rb:61
c:0006 p:0022 s:0034 e:000033 TOP /export/home/cddr/ruby/lib/cgi/util.rb:7 [FINISH]
c:0005 p:---- s:0031 e:000030 CFUNC :require
c:0004 p:0005 s:0026 e:000025 TOP /export/home/cddr/ruby/lib/erb.rb:15 [FINISH]
c:0003 p:---- s:0023 e:000022 CFUNC :require
c:0002 p:0005 s:0018 E:000e10 EVAL ./tool/generic_erb.rb:6 [FINISH]
c:0001 p:0000 s:0003 E:002700 (none) [FINISH]

-- Ruby level backtrace information ----------------------------------------
./tool/generic_erb.rb:6:in `<main>'
./tool/generic_erb.rb:6:in `require'
/export/home/cddr/ruby/lib/erb.rb:15:in `<top (required)>'
/export/home/cddr/ruby/lib/erb.rb:15:in `require'
/export/home/cddr/ruby/lib/cgi/util.rb:7:in `<top (required)>'
/export/home/cddr/ruby/lib/cgi/util.rb:61:in `<module:Util>'
/export/home/cddr/ruby/lib/cgi/util.rb:61:in `require'

-- C level backtrace information -------------------------------------------
/export/home/cddr/ruby/miniruby'rb_vm_bugreport+0x154 [0x10045c97c]
/export/home/cddr/ruby/miniruby'rb_bug_for_fatal_signal+0x1a8 [0x1001c78b4]
/export/home/cddr/ruby/miniruby'sigsegv+0x58 [0x10037f6e0]
/lib/sparcv9/libc.so.1'__sighndlr+0xc [0xffffffff7f0dcdac]
/lib/sparcv9/libc.so.1'call_user_handler+0x354 [0xffffffff7f0cf79c]
/lib/sparcv9/libc.so.1'sigacthandler+0x54 [0xffffffff7f0cfaf4]
/export/home/cddr/ruby/miniruby'exc_setup_message+0x88 [0x1001db3cc]
/export/home/cddr/ruby/miniruby'rb_longjmp+0x2c [0x1001db32c]
/export/home/cddr/ruby/miniruby'rb_exc_exception+0xe8 [0x1001d7a48]
/export/home/cddr/ruby/miniruby'rb_exc_raise+0xc [0x1001d7958]
/export/home/cddr/ruby/miniruby'raise_loaderror+0x48 [0x1001cd67c]
/export/home/cddr/ruby/miniruby'rb_load_fail+0x40 [0x1001ce2c0]
/export/home/cddr/ruby/miniruby'load_failed+0x20 [0x10025343c]
/export/home/cddr/ruby/miniruby'rb_f_require+0x70 [0x1002538e0]
/export/home/cddr/ruby/miniruby'ractor_safe_call_cfunc_1+0x8 [0x100451da8]
/export/home/cddr/ruby/miniruby'vm_call_cfunc_with_frame+0x118 [0x10044f760]
/export/home/cddr/ruby/miniruby'vm_call_method_each_type+0x3f4 [0x100449218]
/export/home/cddr/ruby/miniruby'vm_call_method+0x230 [0x100448da4]
/export/home/cddr/ruby/miniruby'vm_call_general+0xc [0x100431fa8]
/export/home/cddr/ruby/miniruby'vm_sendish+0x938 [0x100446350]
/export/home/cddr/ruby/miniruby'vm_exec_core+0x4830 [0x1004211e0]
/export/home/cddr/ruby/miniruby'rb_vm_exec+0xc10 [0x10043fc40]
/export/home/cddr/ruby/miniruby'rb_iseq_eval+0x1b4 [0x10043fe80]
/export/home/cddr/ruby/miniruby'load_iseq_eval+0xdc [0x100255aa4]
/export/home/cddr/ruby/miniruby'require_internal+0x3d8 [0x1002546a0]
/export/home/cddr/ruby/miniruby'rb_f_require+0x34 [0x1002538a4]
/export/home/cddr/ruby/miniruby'ractor_safe_call_cfunc_1+0x8 [0x100451da8]
/export/home/cddr/ruby/miniruby'vm_call_cfunc_with_frame+0x118 [0x10044f760]
/export/home/cddr/ruby/miniruby'vm_sendish+0x938 [0x100446350]
/export/home/cddr/ruby/miniruby'vm_exec_core+0x4830 [0x1004211e0]
/export/home/cddr/ruby/miniruby'rb_vm_exec+0xc10 [0x10043fc40]
/export/home/cddr/ruby/miniruby'rb_iseq_eval+0x1b4 [0x10043fe80]
/export/home/cddr/ruby/miniruby'load_iseq_eval+0xdc [0x100255aa4]
/export/home/cddr/ruby/miniruby'require_internal+0x3d8 [0x1002546a0]
/export/home/cddr/ruby/miniruby'rb_f_require+0x34 [0x1002538a4]
/export/home/cddr/ruby/miniruby'ractor_safe_call_cfunc_1+0x8 [0x100451da8]
/export/home/cddr/ruby/miniruby'vm_call_cfunc_with_frame+0x118 [0x10044f760]
/export/home/cddr/ruby/miniruby'vm_call_method_each_type+0x3f4 [0x100449218]
/export/home/cddr/ruby/miniruby'vm_call_method+0x230 [0x100448da4]
/export/home/cddr/ruby/miniruby'vm_call_general+0xc [0x100431fa8]
/export/home/cddr/ruby/miniruby'vm_sendish+0x938 [0x100446350]
/export/home/cddr/ruby/miniruby'vm_exec_core+0x4830 [0x1004211e0]
/export/home/cddr/ruby/miniruby'rb_vm_exec+0xc10 [0x10043fc40]
/export/home/cddr/ruby/miniruby'rb_iseq_eval_main+0x278 [0x100440134]
/export/home/cddr/ruby/miniruby'rb_ec_exec_node+0x170 [0x1001d7340]
/export/home/cddr/ruby/miniruby'ruby_run_node+0x94 [0x1001d7168]
/export/home/cddr/ruby/miniruby'main+0x84 [0x1000f28f8]
/export/home/cddr/ruby/miniruby'_start+0x64 [0x1000f26a4]

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

* Loaded script: ./tool/generic_erb.rb

* Loaded features:

0 enumerator.so
1 thread.rb
2 fiber.so
3 rational.so
4 complex.so
5 ruby2_keywords.rb

gmake: *** [Makefile:1789: encdb.h] Abort (core dumped)
$

[tankf33der (Mike P)]

The simplest way to crash miniruby is exec and press Ctrl-D inside it as input.

[xtkoba (Tee KOBAYASHI)]

• File ruby-clang-setjmp-var_from_memory.patch ruby-clang-setjmp-var_from_memory.patch added

From #17947 I guess that Clang/LLVM is used as the compiler. There are some possible workarounds that I can think of, from my experience with Clang/LLVM and setjmp/longjmp.

• __builtin_setjmp is enabled for sparc-sun-solaris target by default. It can be sometimes troublesome (#14480#note-15). Tell the configure script not to use it: ./configure ac_cv_func___builtin_setjmp=no

• It is known that older versions of Clang/LLVM sometimes produces buggy codes around (non-builtin) setjmp when optimizations are enabled. See https://reviews.llvm.org/D77767 for example. Check whether ./configure optflags=-O0 ac_cv_func___builtin_setjmp=no works.

• To workaround the previous bug and simultaneously enable optimizations, add the statement VAR_FROM_MEMORY(var); for each local variable var of which the value is read after the second return (by longjmp) of setjmp. This statement must be placed after the second return of setjmp and before read. A sample patch is attached for that. Then see if ./configure ac_cv_func___builtin_setjmp=no works.

[tankf33der (Mike P)]

You were right, this is llvm's issue.
Ruby successfully passed all tests under GCC on Solaris SPARC.

...
...
PASS all 1488 tests
exec ./miniruby -I./lib -I. -I.ext/common  ./tool/runruby.rb --extout=.ext  -- --disable-gems "./bootstraptest/runner.rb" --ruby="ruby --disable-gems"   ./KNOWNBUGS.rb
2021-06-13 09:29:28 +0300
Driver is ruby 3.1.0dev (2021-06-10T23:31:51Z master 9210f8df7f) [sparc-solaris2.11]
Target is ruby 3.1.0dev (2021-06-10T23:31:51Z master 9210f8df7f) [sparc-solaris2.11]

KNOWNBUGS.rb  PASS 0
No tests, no problem

test succeeded
$

[tankf33der (Mike P)]

Please disable default clang-llvm selection by default on Solaris.
All tests above passed with CC=gcc ./configure --enable-shared --disable-rpath.

[tankf33der (Mike P)]

I believe this issue could be closed.
Fix already in the tree:
https://github.com/ruby/ruby/commit/90cad6e14745d812f042df61a6455db022be7389

[jeremyevans0 (Jeremy Evans)]

• Status changed from Open to Closed

[xtkoba (Tee KOBAYASHI)]

Just FTR, Clang/LLVM __builtin_longjmp is broken for Sparc targets: https://bugs.llvm.org/show_bug.cgi?id=51489