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: [email protected]
Reporter: [email protected]
CC: [email protected]
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
[email protected]: 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 [email protected]: got
0 of 7 bytes (pipeheader) from transport process 50171 for transport smtp
--
Andrew C. Aitchison Kendal, UK
[email protected]
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