IPC/ICMSG breaks if buffer has contents on reboot, but only with very specific confighttps://devzone.nordicsemi.com/f/nordic-q-a/127887/ipc-icmsg-breaks-if-buffer-has-contents-on-reboot-but-only-with-very-specific-configHello Nordic support I have encountered what I think is a bug in ICMSG. The attached sample shows the following behavior: The first time it runs, the app and flpr CPUs succesfully start and communicate via IPC. Then, on reboot, cpuflpr seeminglyen-USTelligent Community 13Tue, 05 May 2026 12:39:23 GMTRE: IPC/ICMSG breaks if buffer has contents on reboot, but only with very specific confighttps://devzone.nordicsemi.com/thread/565893?ContentTypeID=1Tue, 05 May 2026 12:39:23 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ad3873a5-f3d2-436d-8b6f-21cab066d76eFridtjof<p>I have tried v3.3.0 now. I had to change some KConfig options which were removed, but after that it seems to work.</p><div style="clear:both;"></div>RE: IPC/ICMSG breaks if buffer has contents on reboot, but only with very specific confighttps://devzone.nordicsemi.com/thread/565668?ContentTypeID=1Wed, 29 Apr 2026 09:13:54 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e971be53-f62b-4326-be1d-5de4b24181a1Benjamin<p>Hi,<br />This issue was resolved&nbsp;in v3.1.0. See commit&nbsp;<a href="https://github.com/nrfconnect/sdk-zephyr/commit/84a215aff88cec00cb64b7ddef8a53976137f67c">84a215a</a>&nbsp;for&nbsp;more details&nbsp;and implementation.<br /><br />Best regards,<br />Benjamin</p><div style="clear:both;"></div>RE: IPC/ICMSG breaks if buffer has contents on reboot, but only with very specific confighttps://devzone.nordicsemi.com/thread/565389?ContentTypeID=1Thu, 23 Apr 2026 10:21:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a893c1c5-8a55-4380-a118-4ad2552d5200Benjamin<p>Hei&nbsp;<span>Fridtjof,<br />Thanks for reporting! The issue was reproduced successfully, I am investigating and I will report back to you once I know more.<br /><br />Best regards,<br />Benjamin</span></p><div style="clear:both;"></div>