Core 1 panic'ed (Cache disabled but cached memory region accessed) at wifi stack

[burner-]

When I use multiple cores and there is no wifi but wifi stack is enabled I got following crashes. There is no stack trace or any other good way to debug it.
My interrupt handling core is with IRAM_ATTR and it use only volatile variables. Anyway looks that this is more like problem at wifi stack when it try do reconnects at background if wifi client is enabled. By setting WiFi.mode( WIFI_MODE_NULL ); problem goes away.

D][WiFiGeneric.cpp:342] _eventCallback(): Event: 5 - STA_DISCONNECTED
[W][WiFiGeneric.cpp:357] _eventCallback(): Reason: 201 - NO_AP_FOUND
Guru Meditation Error: Core 1 panic'ed (Cache disabled but cached memory region accessed)
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40153688: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40153688: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40153688: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40153688: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40153688: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40153688: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40153688: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40153688: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40153688: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40153688: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40153688: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40153688: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40153688: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40153688: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40153688: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40153688: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40153688: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40153688: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40153688: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40153688: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40153688: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40153688: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40153688: bad00bad bad00bad bad00bad
Guru Meditation Error: Core 1 panic'ed (IllegalInstruction). Exception was unhandled.
Memory dump at 0x40153688: bad00Guru Meditation Error: Core 1 panic'ed (Unhandled debug exception)
Debug exception reason: Stack canary watchpoint triggered (�)
Guru Meditation Error: Core 1 panic'ed (Guru Meditation Error: Core 1 panic'ed (Guru Meditation Error: Core 1 panic'ed (Guru Meditation Error: Core 1 panic'ed (Guru Meditation Error: Core 1 panic'ed (Unknown reason)
Guru Meditation Error: Core 1 panic'ed (Double exception)

[lbernstone]

I've had one of those double exceptions recently. In my case it was a stack memory error. Ensure large allocations are using heap (with malloc or new) rather than stack assignments.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This stale issue has been automatically closed. Thank you for your contributions.

[yakeer]

I'm having the exact same issue, I get this exception only if there is no wifi.
Did you solve it somehow?

[KaarloHirvi]

@yakeer, did you manage to find a solution? I'm asking because it seems we've the same issue, too.

[yakeer]

I moved the reconnection logic from WiFiEvent to the loop.
In the WiFi event I only setup a flag that will init the logic in loop.