BBS: TELESC.NET.BR
Assunto: coredump jsService (probably IMAP)
De: Nigel Reed
Data: Tue, 21 Apr 2026 22:14:32 -0700
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open https://gitlab.synchro.net/main/sbbs/-/issues/1131
Today I noticed a coredump from 16th
```
Core was generated by `/sbbs/exec/sbbs s! d'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x0000793ebc20d4e5 in ?? ()
[Current thread is 1 (Thread 0x793f5b1ff6c0 (LWP 14499))]
(gdb) bt
#0 0x0000793ebc20d4e5 in ?? ()
#1 0x0000793f5b1f8bf0 in ?? ()
#2 0x0000793fc0d0c442 in js::ExecuteTrace (state=..., f=0x793f68e50f70, tm=0x79015b1f8940,
cx=0x793fc0d6b4e4 ) at jstracer.cpp:6568
#3 js::ExecuteTree (cx=0x793f6dda42e0, tm=0xfffaf93f6dda42e0, f=0x793f69cdeeb0,
inlineCallCount=,
innermostNestedGuardp=0x793f5b1f89e0, lrp=0x793f5b1f88a0) at jstracer.cpp:6674
Backtrace stopped: frame did not save the PC
```
Additionally, dmesg has
```
[Thu Apr 16 04:11:53 2026] show_signal_msg: 151 callbacks suppressed
[Thu Apr 16 04:11:53 2026] sbbs/jsService[14499]: segfault at 793ebc20d4e5 ip 0000793ebc20d4e5 sp 0000793f5b1f8a30 error 14 likely on CPU 0 (core 0, socket 0)
[Thu Apr 16 04:11:53 2026] Code: Unable to access opcode bytes at 0x793ebc20d4bb.
```
It appears someone was trying to download a large number of messages via IMAP
```
Apr 16 04:11:52 bbs synchronet: srvc 0054 IMAPv4-TLS Send: * 156: 7579 FETCH (RFC822.SIZE 1536 UID 23250 BODY[HEADER.FIELDS (Message-ID)] {68}#015#012Message-ID: <698AF3AE.23250.agoranetagn_hub@endofthelinebbs.com>#015#012#015#012 FLAGS ())
Apr 16 04:11:52 bbs synchronet: srvc 0054 IMAPv4-TLS Send: * 156: 7580 FETCH (RFC822.SIZE 1946 UID 23251 BODY[HEADER.FIELDS (Message-ID)] {68}#015#012Message-ID: <698C3003.23251.agoranetagn_hub@endofthelinebbs.com>#015#012#015#012 FLAGS ())
Apr 16 04:11:52 bbs synchronet: srvc 0054 IMAPv4-TLS Send: * 156: 7581 FETCH (RFC822.SIZE 6558 UID 23252 BODY[HEADER.FIELDS (Message-ID)] {68}#015#012Message-ID: <698C3003.23252.agoranetagn_hub@endofthelinebbs.com>#015#012#015#012 FLAGS ())
Apr 16 04:11:53 bbs synchronet: srvc 0054 IMAPv4-TLS Send: * 157: 7582 FETCH (RFC822.SIZE 13914 UID 23253 BODY[HEADER.FIELDS (Message-ID)] {68}#015#012Message-ID: <698C3003.23253.agoranetagn_hub@endofthelinebbs.com>#015#012#015#012 FLAGS ())
Apr 16 04:12:28 bbs synchronet: srvc Synchronet Services Version 3.21f Debug
```
n
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mSynchronetn hgVertrauen n hHome of Synchronet n gh[vert/cvs/bbs].synchro.net
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