Re: GDB and MacOS 11.4/BigSur

Sam Warner via Gdb
2021-06-27T22:45:14Z

Hi Simon,

Thanks - yes - I’ll start with that patch first. I obtain the same call stack

My next two things to learn is how to get the equivalent of the symbol-server working, and then to setup a developer-environment for GDB. Any pointers would be great.

Sam

Thread 2 hit Breakpoint 1, 0x00000001007cbcac in internal_error(char const*, int, char const*, ...) ()
(gdb) backtrace
#0 0x00000001007cbcac in internal_error(char const*, int, char const*, ...) ()
#1 0x0000000100397902 in inferior_thread() ()
#2 0x00000001002bdd41 in get_current_regcache() ()
#3 0x000000010033bc59 in darwin_solib_create_inferior_hook(int) ()
#4 0x000000010036555c in symbol_file_command(char const*, int) ()
#5 0x0000000100159047 in file_command(char const*, int) ()
#6 0x00000001000b4ec1 in cmd_func(cmd_list_element*, char const*, int) ()
#7 0x00000001003a0ce9 in execute_command(char const*, int) ()
#8 0x0000000100156348 in command_handler(char const*) ()
#9 0x000000010015661e in command_line_handler(std::__1::unique_ptr<char, gdb::xfree_deleter<char> >&&) ()
#10 0x0000000100155e1a in gdb_rl_callback_handler(char*) ()
#11 0x000000010040ec94 in rl_callback_read_char ()
#12 0x0000000100156d1d in gdb_rl_callback_read_char_wrapper_noexcept() ()
#13 0x0000000100155b1c in gdb_rl_callback_read_char_wrapper(void*) ()
#14 0x000000010015623f in stdin_event_handler(int, void*) ()
#15 0x00000001007cc257 in gdb_wait_for_event(int) ()
#16 0x00000001007cbe37 in gdb_do_one_event() ()
#17 0x00000001001fe000 in captured_command_loop() ()
#18 0x00000001001fd0e5 in gdb_main(captured_main_args*) ()
#19 0x000000010000266c in main ()
(gdb)

> On Jun 27, 2021, at 3:27 PM, Simon Marchi <simon.marchi@polymtl.ca> wrote:
>
> Well, for the issue you reported specifically, please see the patch I
> sent here, I think it fixes it:
>
> https://sourceware.org/pipermail/gdb-patches/2021-June/180396.html
>
> But there were other bugs reported on Bugzilla for macOS, they might
> affect you as well. If you stumble on one of them, you could try to
> write a fix for it and send a patch to the gdb-patches list, so that it
> gets reviewed and eventually merged.

> Simon
>
> On 2021-06-27 4:32 p.m., Sam Warner wrote:
>> Hi Simon,
>> Yeh, I’ve queued to do the actions for the first paragraph based on your input that few are working on resolving issues for GDB/MacOS.
>>
>> When you mentioned " to get patches in a good state and send them to the gdb-patches
>> list for review.” I thought, well, first order of business would be this (as I saw an individual had an attempt in 10.1 to fix a null-pointer). Should I first help here?
>
>