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In the code there is a snippet from '/usr/share/apport/apport' on ubuntu
24.04:
```
# Priming read
if from_report:
...
error_log('writing core dump %s of size %i' % (core_name, core_size))
os.write(core_file, r['CoreDump'])
```
Looking to the fact, that os.write is a low-level function, which is
(most probably) came to write() function of the kernel (see 'man 2
write'), we have following note in the manual:
```
NOTES
...
On Linux, write() (and similar system calls) will transfer at most
0x7ffff000 (2,147,479,552) bytes, returning the number of bytes actually
transferred. (This is true on both 32-bit and 64-bit systems.)
```
The fact is that coredumps are limited by this number. When trying to
catch bigger one, we have file sized exactly 0x7ffff000 bytes; and
they're trunked (i.e. recognized as damaged by gdb) with this default.
** Affects: apport
Importance: High
Status: New
** Affects: apport (Ubuntu)
Importance: High
Status: Triaged
--
max size of user coredump is 0x7ffff000
https://bugs.launchpad.net/bugs/2109979
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