[Bug symtab/29381] [gdb, debug-types, debug-names] read.h:309: internal-error: set_length: Assertion `m_length == length' failed.

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29381

--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
Zooming in on the actual assert, we have:
...
#6  0x0000000000714063 in dwarf2_per_cu_data::set_length (this=0x2cf2cd0,
length=34, 
    strict_p=true) at /home/vries/gdb_versions/devel/src/gdb/dwarf2/read.h:309
309           gdb_assert (m_length == length);
(gdb) p m_length
$5 = 12611
(gdb) p this->sect_off
$7 = (unknown: 0x6d)
...

So initially, during index reading we assign length 12611 to the CU at 0x6d,
but during create_all_comp_units we find that it's actually 34, which looks
correct given the TU at offset 0x8f
...
CU table:
[  0] 0x0
[  1] 0x2e
[  2] 0x6d
[  3] 0x31b0
[  4] 0x7d53
[  5] 0x7f0b

TU table:
[  0] 0x8f
[  1] 0x1eb
[  2] 0x371
[  3] 0x4b0
[  4] 0x4f6
[  5] 0x53c
...

The initial 12611 length corresponds to 0x31b0 - 0x6d.

So that looks like another bug, which normally doesn't surface because we
reject the .debug_names index if it has TUs in the .debug_info section.

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