# Mosquitto MQTT broker

**URL:** <https://forum.cedalo.com/t/mosquitto-mqtt-broker/1237>\
**Category:** Mosquitto MQTT Broker\
**Created:** [March 19, 2026, 10:46am UTC](https://forum.cedalo.com/t/mosquitto-mqtt-broker/1237 "2026-03-19T10:46:02Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Amrit](https://avatars.discourse-cdn.com/v4/letter/a/d9b06d/32.png) [@Amrit](https://forum.cedalo.com/u/Amrit)\
**Post date:** [March 19, 2026, 10:46am UTC](https://forum.cedalo.com/t/mosquitto-mqtt-broker/1237/1 "2026-03-19T10:46:02Z")

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Hello sir,

We are using mosquitto MQTT broker version 3.1.1 & deployed on Linux ubuntu machines.

We observed mosquitto auto restart with below error in syslog.

kernel: [11920710.948355] traps: mosquitto[18931] general protection ip:7f19e2c9f25b sp:7ffe6752d920 error:0  
\*\*\* Error in `/usr/sbin/mosquitto': malloc(): smallbin double linked list corrupted: 0x0000563fe58497e0 *** mosquitto[31198]: mosquitto: ../lib/send_publish.c:54: send__publish: Assertion `topic’ failed.  
\*\*\* Error in `/usr/sbin/mosquitto': corrupted double-linked list: 0x00005559bd7fe0c0 ***kernel: [11989434.698883] mosquitto[6889]: segfault at 30 ip 00007f97d5fff676 sp 00007ffd02540e58 error 4 in libc-2.24.so[7f97d5f7f000+195000*** Error in `/usr/sbin/mosquitto’: corrupted double-linked list: 0x000055f0edc4c760 \*\*\*

Kindly sugegst root cause & solution.

Regards,

Amrit