On 2023-10-27, Jeremy Harris via Exim-users <exim-users@???> wrote:
> On 27/10/2023 04:12, Julian Waters via Exim-users wrote:
>> I haven’t raised a debian bug, I’m assuming it’s just my incompetence.
>
> That a segv can happen at all constitutes a bug,
> however it was triggered.
>
>> Can you run with debug?
>
> This would have helped, but
>
>> Can you get a coredump (note: Exim is usually run suid)?
>
> This turns out to be essential, as the segv is hitting in
> a library:
>
> (libgnutls.so.30 + 0x15e06e)#012#2 0x00007f451526b354 gnutls_certificate_set_dh_params
> (libgnutls.so.30 + 0x6b354)#012#3 0x000056095cf86da5 n/a
> (exim4 + 0xbfda5)#012#4 0x000056095cf871c6 n/a
> (exim4 + 0xc01c6)#012#5 0x000056095cf88280 n/a
> (exim4 + 0xc1280)#012#6 0x000056095cf74622 n/a
> (exim4 + 0xad622)#012#7 0x000056095cf06eef n/a
> (exim4 + 0x3feef)#012#8 0x000056095cef89d8 n/a
> (exim4 + 0x319d8)#012#9 0x00007f45154461ca __libc_start_call_main
> (libc.so.6 + 0x271ca)#012#10 0x00007f4515446285 __libc_start_main_impl
>
> What we can glean so far is:
> - the crash is in the GnuTLS library
> - (inference) possibly exim handed it some parameter it can't handle
>
> and, you might actually have a core dump:
>
> systemd-coredump[1400341]: Process 1400339 (exim4) of user 113 dumped core.#012#012S
>
>
> However, this will probably have been a fully optimised binary for exim, and might
> not include debug information. It it doesn't, there might be an adjunct "debuginfo"
> package you can install - or it may be that it requires special compilation.
> You need to discuss this with Debian-knowledgeable people.
The package name is exim4-daemon-light-dbgsym or
exim4-daemon-heavy-dbgsym to match the exim4-daemon-* package installed
> Once debug info is present, the next step is to investigate a coredump using gdb,
> and get a stackdump (use the "bt" command) complete with function call arguments.
>
> I still think you should open a Debian bug for this.
--
Jasen.
🇺🇦 Слава Україні
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