SBC freezes during print (even simulation) with 3.2beta3.2

[oliof]

After resolving my undervoltage issues and having the printer run idle for >24h, I tried simulating a print. During the simulation or at it's end, the machine stopped responding on the network. I can still connect via pronterface, and everything that doesn't need to access the SBC works. The virtual SD card is not accessible, and the SBC does not react to network requests (both HTTP and SSH are dead).

Here is an M122, M20, M114, M105, and simple move on the X axis:

Connecting...
Printer is now online.
>>> M122
SENDING:M122
=== Diagnostics ===
RepRapFirmware for Duet 3 MB6HC version 3.2-beta3.2 running on Duet 3 MB6HC v0.6 or 1.0 (SBC mode)
Board ID: 08DGM-9T66A-G63SJ-6J1D6-3SD6R-9U0BA
Used output buffers: 1 of 40 (17 max)
=== RTOS ===
Static ram: 122236
Dynamic ram: 138824 of which 56 recycled
Never used RAM 131076, free system stack 126 words
Tasks: Linux(blocked,71) HEAT(blocked,277) CanReceiv(blocked,869) CanSender(blocked,352) CanClock(blocked,352) TMC(blocked,18) MAIN(running,671) IDLE(ready,19)
Owned mutexes: USB(MAIN)
=== Platform ===
Last reset 20:42:07 ago, cause: power up
Last software reset at 2020-11-15 12:51, reason: User, GCodes spinning, available RAM 131212, slot 0
Software reset code 0x0003 HFSR 0x00000000 CFSR 0x00000000 ICSR 0x0044a000 BFAR 0x00000000 SP 0xffffffff Task Linu
Error status: 0x00
[ERROR] Error status: 0x00

MCU temperature: min 31.0, current 33.2, max 33.4
Supply voltage: min 24.0, current 24.0, max 24.1, under voltage events: 0, over voltage events: 0, power good: yes
12V rail voltage: min 12.2, current 12.2, max 12.3, under voltage events: 0
Driver 0: position 11200, standstill, reads 45951, writes 0 timeouts 0, SG min/max not available
Driver 1: position 30400, standstill, reads 45951, writes 0 timeouts 0, SG min/max not available
Driver 2: position 9600, standstill, reads 45951, writes 0 timeouts 0, SG min/max not available
Driver 3: position 0, standstill, reads 45951, writes 0 timeouts 0, SG min/max not available
Driver 4: position 0, standstill, reads 45950, writes 0 timeouts 0, SG min/max not available
Driver 5: position 0, standstill, reads 45951, writes 0 timeouts 0, SG min/max not available
Date/time: 2020-11-17 10:02:59
Slowest loop: 117.40ms; fastest: 0.09ms
=== Storage ===
Free file entries: 10
SD card 0 not detected, interface speed: 37.5MBytes/sec
SD card longest read time 0.0ms, write time 0.0ms, max retries 0
=== Move ===
Hiccups: 0(0), FreeDm: 375, MinFreeDm: 375, MaxWait: 60208367ms
Bed compensation in use: none, comp offset 0.000
=== MainDDARing ===
Scheduled moves 110707, completed moves 110707, StepErrors 0, LaErrors 0, Underruns [0, 0, 0], CDDA state -1
=== AuxDDARing ===
Scheduled moves 0, completed moves 0, StepErrors 0, LaErrors 0, Underruns [0, 0, 0], CDDA state -1
=== Heat ===
Bed heaters = 0 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1, chamberHeaters = -1 -1 -1 -1
=== GCodes ===
Segments left: 0
Movement lock held by null
HTTP* is idle in state(s) 0
Telnet is idle in state(s) 0
File* is idle in state(s) 0
USB is ready with "M122" in state(s) 0
Aux is idle in state(s) 0
Trigger* is idle in state(s) 0
Queue* is idle in state(s) 0
LCD is idle in state(s) 0
SBC is idle in state(s) 0
Daemon is idle in state(s) 0
Aux2 is idle in state(s) 0
Autopause is idle in state(s) 0
Code queue is empty.
=== CAN ===
Messages sent 161542, send timeouts 161542, longest wait 4ms for type 6024, free CAN buffers 47
=== SBC interface ===
State: 0, failed transfers: 0
Last transfer: 2243310ms ago
RX/TX seq numbers: 0/39658
SPI underruns 0, overruns 0
Number of disconnects: 2, IAP RAM available 0x20a04
Buffer RX/TX: 0/0-0
>>> M111
SENDING:M111
Debugging enabled for modules:
Debugging disabled for modules: Platform(0) Network(1) Webserver(2) GCodes(3) Move(4) Heat(5) DDA(6) Roland(7) Scanner(8) PrintMonitor(9) Storage(10) PortControl(11) DuetExpansion(12) FilamentSensors(13) WiFi(14) Display(15) LinuxInterface(16) CAN(17)
>>> M111 P16 S1
SENDING:M111 P16 S1
Debugging enabled for modules: LinuxInterface(16)
Debugging disabled for modules: Platform(0) Network(1) Webserver(2) GCodes(3) Move(4) Heat(5) DDA(6) Roland(7) Scanner(8) PrintMonitor(9) Storage(10) PortControl(11) DuetExpansion(12) FilamentSensors(13) WiFi(14) Display(15) CAN(17)
>>> M20
SENDING:M20
Begin file list
NONE
End file list
>>> M115
SENDING:M115
FIRMWARE_NAME: RepRapFirmware for Duet 3 MB6HC FIRMWARE_VERSION: 3.2-beta3.2 ELECTRONICS: Duet 3 MB6HC v0.6 or 1.0 FIRMWARE_DATE: 2020-11-12
>>> M114
SENDING:M114
X:130.000 Y:-60.000 Z:6.000 E:0.000 E0:0.0 Count 11200 30400 9600 Machine 130.000 -60.000 6.000 Bed comp 0.000
>>> M105
SENDING:M105
ok T:24.4 /0.0 T0:24.4 /0.0 B:20.8 /0.0
>>> M552
SENDING:M552
Error: M552: Network-related commands are not supported when using an attached Single Board Computer
[ERROR] Error: M552: Network-related commands are not supported when using an attached Single Board Computer

>>> M98 P"config.g"
SENDING:M98 P"CONFIG.G"
Warning: Macro file CONFIG.G not found
>>> G0 X-20
SENDING:G0 X-20

Should I be setting debugging for the LinuxInterface and try again?