"Panic Invalid pool free chain" after upgrade to 12.0.1 or 12.0.1FP1 technote published

Vladislav Tatarincev  24 May 2022 09:28:15

As mentioned in previous post, HCL has published technote about 12.0.1 and 12.0.1
 


HCL Domino server keeps crashing due to memory corruption with an error "Panic Invalid pool free chain" after upgrade to 12.0.1 or 12.0.1FP1
https://support.hcltechsw.com/csm?id=kb_article&sysparm_article=KB0098671

Cause
Once the debug parameter debug_checkmarkers=1 is enabled on server, the server crashes with an error "PANIC: CheckMarkers: Memory following object has been destroyed" as soon as memory corruption is detected. While reviewing logs, The call stacks in NSD indicate a network buffer has been written past it's boundary.

Resolution
There's a change in HCL Domino v12, where we increased the network buffer size from a default of 4000 to 8000 as we noticed some network operations need additional memory. Increasing network buffer further from 8000 to 8100 by making below change in server's notes.ini file, the server stops crashing and gets stable.

TCPIP=TCP,0,15,0,,12320
to
TCPIP=TCP,0,15,8100,,12320

And adding below parameter too

debug_net_max_buffer_size=8100

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