On Mon, 22 May 2023, Exim Bugzilla via Exim-dev wrote:
> https://bugs.exim.org/show_bug.cgi?id=3005
>
> Bug ID: 3005
> Summary: segfault while SMTP error from remote mail server
> after RCPT TO handling
> Product: Exim
> Version: 4.94
> Hardware: x86-64
> OS: Linux
> Status: NEW
> Severity: bug
> Priority: medium
> Component: Transports
> Assignee: unallocated@???
> Reporter: lkazankin@???
> CC: exim-dev@???
I note TFO mode in the debug log.
Which kernel are you using ?
Is the recipient @google/gmail ?
Debian had a similar issue with exim, TCP fastopen (TFO) and Google last year.
The bug and fix ended up being in the kernel.
Also exim 4.94 is not current.
I would upgrade to 4.96 before looking at seg-faults.
> /var/log/messages
>
> May 22 08:57:47 <host> kernel: exim[4587]: segfault at 17c ip 00000000004bca6a
> sp 00007fff069acbe0 error 4 in exim-4.94.2-2[400000+115000]
>
> /var/log/exim/exim_paniclog
>
> 2023-05-22 08:57:47.158 1pzxEL-0004JR-AX Delivery status for
> non-existing-mailbox@???: got 0 of 7 bytes (pipeheader) from transport
> process 4587 for transport smtp
> exim -d+all -M 1pzxEL-0004JR-AX
>
> 09:51:50.327 50171 Connecting to mail.example.com [<IP>]:25 ... <IP> in
> hosts_try_fastopen? yes (matched "*")
> 09:51:50.327 50171 TFO mode sendto, no data: EINPROGRESS
> 09:51:50.327 50171 connected
> 09:51:50.327 50171 ╭considering: $primary_hostname
> 09:51:50.327 50171 ├──expanding: $primary_hostname
> 09:51:50.327 50171 ╰─────result: <host>
> 09:52:05.348 50171 SMTP(Connection timed out)<<
> 09:52:05.348 50171 SMTP(close)>>
> 09:52:05.375 50164 reading pipe for subprocess 50171 (not ended yet)
> 09:52:05.375 50164 expect 7 bytes (pipeheader) from tpt process 50171
> 09:52:05.375 50164 LOG: MAIN PANIC
> 09:52:05.375 50164 Delivery status for non-existing-mailbox@???: got
> 0 of 7 bytes (pipeheader) from transport process 50171 for transport smtp
--
Andrew C. Aitchison Kendal, UK
andrew@???
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