[Bug gdb/31497] gdb internal fatal error while opening a core dump; binary built with '-gsplit-dwarf'

["tromey at sourceware dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31497

Tom Tromey <tromey at sourceware dot org> changed:

           What    |Removed                     |Added
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                 CC|                            |tromey at sourceware dot org

--- Comment #1 from Tom Tromey <tromey at sourceware dot org> ---
>       -> p is NULL -> SIGSEGV in read_initial_length() below

I think this means the section wasn't read in for some reason.
This is probably where I would start investigating.

One thing I notice is that read_str_index ensures that the
section is read in:

  str_section->read (objfile);
  str_offsets_section->read (objfile);

However, read_dwo_str_index does not do this.

I think I'd expect the section to be read in by dwarf2_locate_dwo_sections
or dwarf2_locate_v2_dwp_sections or dwarf2_locate_v5_dwp_sections, though.
(Depending on which file it comes from, I didn't look too deeply here...)

Could you see if one of those is hit and reads the section?
Maybe there's some error.  Or maybe just adding the calls to
read_dwo_str_index will fix it, this seems like an oversight
in the commit you pointed out.

>   [ 6] .debug_str_offsets.dwo PROGBITS        0000000000000000 0583e7 0057f8 00   E  0   0  1
>       --- gdb/dwarf2/read.c:10821 [create_dwo_unit_in_dwp_v5] -> size=0x57f8 correct but offset=0 wrong

The offset from 'readelf -WS' is the offset in the file.
I'm not sure but I doubt it's the same as the offsets mentioned
in create_dwp_hash_table.

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