Re: [Tinycc-devel] TCC segfault on Fedora 29

[Christian Jullien]

Hello Michael,
I recompiled tcc with -O0 here is was I get. Don't hesitate to ask me
more...

address@hidden tests]$ gdb --args ../tcc -B.. -I../include -I.. -I..
-DCONFIG_LDDIR="\"lib64\"" -DTCC_TARGET_X86_64 -DHAVE_SELINUX
-DLIBTCC_AS_DLL ../libtcc.c -lm -ldl -shared -o libtcc2.so
..
(gdb) run
Starting program: /home/jullien/tinycc/tcc -B.. -I../include -I.. -I..
-DCONFIG_LDDIR=\"lib64\" -DTCC_TARGET_X86_64 -DHAVE_SELINUX -DLIBTCC_AS_DLL
../libtcc.c -lm -ldl -shared -o libtcc2.so
Missing separate debuginfos, use: dnf debuginfo-install
glibc-2.28-26.fc29.x86_64

Program received signal SIGSEGV, Segmentation fault.
alloc_sec_names (s1=0x469260, file_type=3, strsec=0x568610) at tccelf.c:1541
1541                (s1->sections[s->sh_info]->sh_flags & SHF_ALLOC) &&
(gdb) bt
#0  alloc_sec_names (s1=0x469260, file_type=3, strsec=0x568610) at
tccelf.c:1541
#1  0x0000000000423842 in elf_output_file (s1=0x469260, filename=0x46e590
"libtcc2.so") at tccelf.c:2132
#2  0x0000000000423cf4 in tcc_output_file (s=0x469260, filename=0x46e590
"libtcc2.so") at tccelf.c:2245
#3  0x0000000000403be0 in main (argc0=15, argv0=0x7fffffffd668) at tcc.c:358
(gdb) info locals
i = 10
s = 0x4716d0
textrel = 0
(gdb) print *s
$1 = {data_offset = 144, data = 0x471780 "\024", data_allocated = 256,
sh_name = 0, sh_num = 10, sh_type = 4, sh_flags = 64, sh_info = 0,
sh_addralign = 8, sh_entsize = 24, sh_size = 0, sh_addr = 0, 
  sh_offset = 0, nb_hashed_syms = 0, link = 0x469ad0, reloc = 0x0, hash =
0x0, prev = 0x0, name = "."}
(gdb) print *s1
$2 = {verbose = 0, nostdinc = 0, nostdlib = 0, nocommon = 1, static_link =
0, rdynamic = 0, symbolic = 0, filetype = 0, cversion = 199901, tcc_lib_path
= 0x469820 "..", soname = 0x0, rpath = 0x0, 
  enable_new_dtags = 0, output_type = 3, output_format = 0, char_is_unsigned
= 0, leading_underscore = 0, ms_extensions = 1, dollars_in_identifiers = 0,
ms_bitfields = 0, warn_write_strings = 0, 
  warn_unsupported = 0, warn_error = 0, warn_none = 0,
warn_implicit_function_declaration = 1, warn_gcc_compat = 0, do_debug = 0,
do_bounds_check = 0, run_test = 0, text_addr = 0, has_text_addr = 0, 
  section_align = 0, init_symbol = 0x0, fini_symbol = 0x0, nosse = 0,
loaded_dlls = 0x5685b0, nb_loaded_dlls = 4, include_paths = 0x46e560,
nb_include_paths = 3, sysinclude_paths = 0x46e6a0, 
  nb_sysinclude_paths = 3, library_paths = 0x46e730, nb_library_paths = 3,
crt_paths = 0x46e760, nb_crt_paths = 1, cmd_include_files = 0x0,
nb_cmd_include_files = 0, error_opaque = 0x0, 
  error_func = 0x0, error_set_jmp_enabled = 0, error_jmp_buf = {{__jmpbuf =
{0, 2321536552689024907, 4203648, 140737488344672, 0, 0,
2321536552693219211, -2321537099244945525}, __mask_was_saved = 0, 
      __saved_mask = {__val = {0 <repeats 16 times>}}}}, nb_errors = 0, ppfp
= 0x7ffff7e1f780 <_IO_2_1_stdout_>, Pflag = LINE_MACRO_OUTPUT_FORMAT_GCC,
dflag = 0 '\000', target_deps = 0x46b650, 
  nb_target_deps = 200, include_stack = {0x46e780, 0x471d10, 0x592ff0,
0x592ff0, 0x57f890, 0x518250, 0x4abaa0, 0x0 <repeats 25 times>},
include_stack_ptr = 0x469478, ifdef_stack = {0, 1, 1, 0, 1, 2, 1, 
    1, 2, 1, 0 <repeats 54 times>}, ifdef_stack_ptr = 0x469580,
cached_includes_hash = {57, 38, 83, 22, 0, 48, 43, 60, 78, 86, 75, 53, 84,
76, 58, 74, 79, 0, 88, 34, 71, 54, 65, 18, 82, 81, 87, 85, 0, 
    13, 69, 59}, cached_includes = 0x517e40, nb_cached_includes = 88,
pack_stack = {0, 0, 0, 0, 0, 0, 0, 0}, pack_stack_ptr = 0x469714,
pragma_libs = 0x0, nb_pragma_libs = 0, inline_fns = 0x0, 
  nb_inline_fns = 0, sections = 0x4a93f0, nb_sections = 24, priv_sections =
0x469f50, nb_priv_sections = 5, got = 0x471c40, plt = 0x595080,
dynsymtab_section = 0x469d10, dynsym = 0x581430, 
  symtab = 0x469ad0, sym_attrs = 0x5ca040, nb_sym_attrs = 2048, runtime_main
= 0x0, runtime_mem = 0x0, nb_runtime_mem = 0, files = 0x46e5f0, nb_files =
3, nb_libraries = 2, 
  outfile = 0x46e590 "libtcc2.so", option_r = 0, do_bench = 0, gen_deps = 0,
deps_outfile = 0x0, option_pthread = 0, argc = 0, argv = 0x0}

C.

-----Original Message-----
From: Tinycc-devel [mailto:address@hidden
On Behalf Of Michael Matz
Sent: lundi 4 mars 2019 18:48
To: address@hidden
Subject: Re: [Tinycc-devel] TCC segfault on Fedora 29

Hi,

On Mon, 4 Mar 2019, Christian Jullien wrote:

> Ooops, not quite.
> I missed this line on log file (from Fedora 29).
> Btw, as suggested by ./configure,  Fedora 29 requires --with-selinux
> 
> ------------ dlltest ------------
> ../tcc -B.. -I../include -I.. -I.. -DCONFIG_LDDIR="\"lib64\""
> -DTCC_TARGET_X86_64 -DHAVE_SELINUX -DLIBTCC_AS_DLL ../libtcc.c -lm -ldl
> -shared -o libtcc2.so
> make[1]: *** [Makefile:132: dlltest] Segmentation fault (core dumped)

Different bug?  I don't have fedora 29 so can't debug this myself, what 
does the gdb backtrace look like for the coredump (to make that easier, 
build tcc with '-O0 -g', not the default -O2, i.e. change CFLAGS in 
config.mak).


Ciao,
Michael.


> 
> -----Original Message-----
> From: Tinycc-devel
[mailto:address@hidden
> On Behalf Of Michael Matz
> Sent: lundi 4 mars 2019 16:58
> To: address@hidden
> Subject: Re: [Tinycc-devel] TCC segfault on Fedora 29
> 
> Hi,
> 
> On Fri, 1 Mar 2019, Klaus Ebbe Grue wrote:
> 
> > Is there news on the Fedora 29 segfault problem?
> 
> No, as nobody provided the breaking crt*.o files ...
> 
> > > some time. Alternatively: somebody can send me their /usr/lib64/crt*.o
> > > files from a system where the segfault reproduces. It's some unhandled
> > 
> > I have included my /usr/lib64/crt*.o files, if that helps (I hope the 
> > mailing list accepts attachments).
> 
> ... until now.  Fixed in mob.
> 
> 
> Ciao,
> Michael.
> 
> _______________________________________________
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> 
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