The log shows it actually crashes during the shutdown process -- but @Michael, I'm pretty sure this is an old issue, turning up now only by chance.

This looks like a race condition between event handler invocation and deregistration:

Guru Meditation Error: Core 1 panic'ed (InstrFetchProhibited). Exception was unhandled.
…
Backtrace: 0x41000000:0x3ffc8c30 0x401208ed:0x3ffc8c60 0x401209d4:0x3ffc8cc0 0x40120a5d:0x3ffc8d00

→ Crash at 0x41000000 (invalid address), called from:

0x401208ed is in OvmsEvents::HandleQueueSignalEvent(event_queue_t*) (/home/balzer/esp/Open-Vehicle-Monitoring-System-3/vehicle/OVMS.V3/main/ovms_events.cpp:310).
305           {
306           for (EventCallbackList::iterator itc=el->begin(); itc!=el->end(); ++itc)
307             {
308             m_current_started = monotonictime;
309             m_current_callback = *itc;
310             m_current_callback->m_callback(m_current_event, msg->body.signal.data);
311             m_current_callback = NULL;
312             }
313           }
314         }

From there it then enters a crash loop from the crash handler somehow running into an illegal address when trying to access the RTC boot_data object (?).

I think, when introducing the separate event handling task, we missed adding a lock to make manipulations & accesses to the event handler list atomic.

The log shows, the event queue grew significantly due to duktape/scripts lagging during shutdown (as seen in the log), so the task was quite busy.

So probably a `DeregisterEvent()` call from the shutdown process came in, invalidating a callback entry just while the event task was processing that callback list.

Solving this may need some additional thoughts & measures: locking the whole event registry with handlers lagging like this could lead to a deadlock… probably at least the Duktape component needs to cleanly abort/reject all pending events before/while deregistering.

Michael, if you'd like to have a look at this, go ahead.

Regards,
Michael

Am 01.01.25 um 11:47 schrieb Tamás Kovács via OvmsDev:

Now i change the sd card to a smaller, and formatted to fat32 (16Gb), but on reboot is crashing.

Now connect a computer to the usb port, and create a log in verbose, attached to the email.

--

Üdvözlettel:
Kovács Tamás
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Michael Balzer * Am Rahmen 5 * D-58313 Herdecke
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