Modem crash, error 0x10, Modem FW 1.3.6

Question

Hi,

I am running the stock UDP example on a nRF9160-DK (PCA10090, 0.8.5, 2019.7, Modem FW 1.3.6) and the modem crashes immediately.

*** Booting nRF Connect SDK v3.5.99-ncs1-1 ***
UDP sample has started
E: Modem has crashed, reason 0x10, PC: 0x1142c4
E: Modem library initialization failed, err -5
I: Trace thread ready
E: Failed to set trace level, err: -1
I: Trace level override: 2
E: Failed to start tracing, err -8
E: Modem library init error: -5, lte_lc not initialized
Failed to initialize modem library, error: -5
I: No more trace data

I have also tried the CoAP example and I am getting a similar result.

*** Booting nRF Connect SDK v3.5.99-ncs1-1 ***
[00:00:00.341,705] <inf> coap_client_sample: The CoAP client sample started
[00:00:00.341,705] <inf> coap_client_sample: Bringing network interface up and connecting to the network
[00:00:00.539,306] <err> nrf_modem_lib_netif: Modem error: 0x10, PC: 0x1142c4
ASSERTION FAIL [!arch_is_in_isr()] @ WEST_TOPDIR/zephyr/kernel/mutex.c:110
        mutexes cannot be used inside ISRs
[00:00:00.539,428] <err> os: r0/a1:  0x00000004  r1/a2:  0x0000006e  r2/a3:  0x00000003
[00:00:00.539,459] <err> os: r3/a4:  0x2000cb90 r12/ip:  0x00000014 r14/lr:  0x0001bc73
[00:00:00.539,459] <err> os:  xpsr:  0x4100003a
[00:00:00.539,459] <err> os: Faulting instruction address (r15/pc): 0x000200cc
[00:00:00.539,520] <err> os: >>> ZEPHYR FATAL ERROR 4: Kernel panic on CPU 0
[00:00:00.539,520] <err> os: Fault during interrupt handling

[00:00:00.539,550] <err> os: Current thread: 0x2000d380 (unknown)
[00:00:00.608,917] <err> fatal_error: Resetting system

I did manage to rebuild the UDP example to allow for a modem trace.

trace-2024-07-15T15-56-22.067Z.mtrace

Any ideas or is this DK just broken?