On 2022/08/11 19:02, Lianbo Jiang wrote:
> When the lack of debuginfo package, try to load its module with the "mod
> -s xxx" in crash, it will cause the crash utility coredump as below:
>
> crash> mod -s kpatch_test kpatch_test.ko
> ...
> terminate called after throwing an instance of 'std::logic_error'
> what(): basic_string::_M_construct null not valid
> Aborted (core dumped)
What does "the lack of debuginfo package" mean? I tried to reproduce
this with my test module, but could not. How can I reproduce this?
crash> mod -s test test.ko
MODULE NAME BASE SIZE OBJECT FILE
ffffffffc07c8040 test ffffffffc07c6000 16384 test.ko
And the gdb-10.2.patch already has a patch for gdb-10.2/gdb/symfile.c,
it would be better to restore the file before re-patching.
tar xvzmf gdb-10.2.tar.gz \
+ gdb-10.2/gdb/symfile.c \
gdb-10.2/gdb/Makefile.in
Thanks,
Kazu
>
> Let's return the std::string() instead of std::string(NULL) when a
> string is null, because the check_specified_kernel_debug_file() may
> return NULL.
>
> Signed-off-by: Lianbo Jiang <lijiang@xxxxxxxxxx>
> ---
> (gdb) bt
> #0 __pthread_kill_implementation (threadid=<optimized out>, signo=<optimized out>, no_tid=<optimized out>) at pthread_kill.c:44
> #1 0x00007fff8b48223c in __GI_raise (sig=<optimized out>) at ../sysdeps/posix/raise.c:26
> #2 0x00007fff8b45c70c in __GI_abort () at abort.c:79
> #3 0x00007fff8b8cbee8 in __gnu_cxx::__verbose_terminate_handler () at ../../../../libstdc++-v3/libsupc++/vterminate.cc:95
> #4 0x00007fff8b8c74e4 in __cxxabiv1::__terminate (handler=<optimized out>) at ../../../../libstdc++-v3/libsupc++/eh_terminate.cc:48
> #5 0x00007fff8b8c75b0 in std::terminate () at ../../../../libstdc++-v3/libsupc++/eh_terminate.cc:58
> #6 0x00007fff8b8c7a94 in __cxxabiv1::__cxa_throw (obj=<optimized out>, tinfo=0x7fff8bac48b0 <typeinfo for std::logic_error>, dest=0x7fff8b8e93d0 <std::logic_error::~logic_error()>) at ../../../../libstdc++-v3/libsupc++/eh_throw.cc:95
> #7 0x00007fff8b889370 in std::__throw_logic_error (__s=0x1312445d0 "basic_string::_M_construct null not valid") at ../../../../../libstdc++-v3/src/c++11/functexcept.cc:70
> #8 0x000000013105d448 in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_construct<char const*>(char const*, char const*, std::forward_iterator_tag) [clone .constprop.0] (this=0x7fffdde41128, __beg=<optimized out>, __end=<optimized out>) at /usr/include/c++/11/bits/basic_string.tcc:212
> #9 0x0000000130da805c in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string<std::allocator<char> > (__a=..., __s=<optimized out>, this=0x7fffdde41128) at /usr/include/c++/11/bits/basic_string.h:539
> #10 find_separate_debug_file_by_debuglink[abi:cxx11](objfile*) (objfile=<optimized out>) at symfile.c:1613
> #11 0x0000000130b41028 in elf_symfile_read (objfile=0x1003ccd5bb0, symfile_flags=...) at elfread.c:1304
> #12 0x0000000130da68b8 in read_symbols (objfile=<optimized out>, objfile@entry=0x1003ccd5bb0, add_flags=..., add_flags@entry=...) at symfile.c:800
> #13 0x0000000130da5f48 in syms_from_objfile_1 (add_flags=..., addrs=0x7fffdde41450, objfile=0x1003ccd5bb0) at symfile.c:997
> #14 syms_from_objfile (add_flags=..., addrs=0x7fffdde41450, objfile=0x1003ccd5bb0) at symfile.c:1014
> #15 symbol_file_add_with_addrs (abfd=<optimized out>, name=name@entry=0x1003db636a0 "kpatch_test.ko", add_flags=add_flags@entry=..., addrs=addrs@entry=0x7fffdde41450, flags=..., flags@entry=..., parent=parent@entry=0x0) at symfile.c:1123
> #16 0x0000000130da86e8 in symbol_file_add_from_bfd (parent=0x0, flags=..., addrs=0x7fffdde41450, add_flags=..., name=0x1003db636a0 "kpatch_test.ko", abfd=<optimized out>) at symfile.c:1204
> #17 symbol_file_add (name=0x1003db636a0 "kpatch_test.ko", add_flags=..., addrs=0x7fffdde41450, flags=...) at symfile.c:1217
> #18 0x0000000130dade4c in add_symbol_file_command (args=<optimized out>, from_tty=<optimized out>) at symfile.c:2388
> #19 0x0000000130a3e04c in do_const_cfunc (c=<optimized out>, args=<optimized out>, from_tty=<optimized out>) at cli/cli-decode.c:95
> #20 0x0000000130a40c48 in cmd_func (cmd=<optimized out>, args=<optimized out>, from_tty=<optimized out>) at cli/cli-decode.c:2181
> #21 0x0000000130e2344c in execute_command (p=<optimized out>, from_tty=<optimized out>) at top.c:668
> #22 0x0000000130dc9d9c in gdb_add_symbol_file (req=0x7fffdde41b10) at symtab.c:7436
> #23 gdb_command_funnel_1 (req=req@entry=0x7fffdde41b10) at symtab.c:7004
> #24 0x0000000130dcaa40 in gdb_command_funnel (req=0x7fffdde41b10) at symtab.c:6954
> #25 0x00000001308c78ec in gdb_interface (req=0x7fffdde41b10) at ../../gdb_interface.c:409
> #26 0x0000000130942adc in add_symbol_file (lm=0x1003ff62098) at ../../symbols.c:11914
> #27 0x00000001309442a0 in load_module_symbols (modref=<optimized out>, namelist=0x13146b682 <program_context+258> "kpatch_test.ko", base_addr=13837309855101681664) at ../../symbols.c:11852
> #28 0x000000013089f7b0 in do_module_cmd (flag=3, modref=<optimized out>, address=<optimized out>, objfile=<optimized out>, tree=<optimized out>) at ../../kernel.c:4602
> #29 0x000000013089da6c in cmd_mod () at ../../kernel.c:4204
> #30 0x00000001307e27bc in exec_command () at ../../main.c:892
> #31 0x000000013094d004 in exec_input_file () at ../../cmdline.c:1489
> #32 0x00000001307e2214 in is_input_file () at ../../main.c:988
> #33 exec_command () at ../../main.c:899
> #34 0x00000001307e2bbc in main_loop () at ../../main.c:839
> #35 0x0000000130c30654 in captured_main (data=<optimized out>) at main.c:1284
> #36 gdb_main (args=<optimized out>) at main.c:1313
> #37 0x00000001308c5fbc in gdb_main_entry (argv=0x7fffdde45ca8, argc=2) at main.c:1338
> #38 gdb_main_loop (argc=2, argv=0x7fffdde45ca8) at ../../gdb_interface.c:81
> #39 0x00000001307d1158 in main (argc=<optimized out>, argv=0x7fffdde45ca8) at ../../main.c:720
> (gdb)
>
> gdb-10.2.patch | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/gdb-10.2.patch b/gdb-10.2.patch
> index 577f5e45fc5a..3e0569d8ea98 100644
> --- a/gdb-10.2.patch
> +++ b/gdb-10.2.patch
> @@ -1650,3 +1650,13 @@ exit 0
>
> c_print_type_1 (type->field (i).type (),
> TYPE_FIELD_NAME (type, i),
> +--- gdb-10.2/gdb/symfile.c.orig
> ++++ gdb-10.2/gdb/symfile.c
> +@@ -1610,7 +1610,7 @@ find_separate_debug_file_by_debuglink (struct objfile *objfile)
> + if (debugfile.empty ()) {
> + char *name_copy;
> + name_copy = check_specified_kernel_debug_file();
> +- return std::string (name_copy);
> ++ return name_copy ? std::string (name_copy) : std::string ();
> + }
> + #endif
--
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