nRF51822 sometimes hard fault on connect

[korneliuszo]

Describe the bug

I write code https://github.com/korneliuszo/lumiax-controller/
and it sometimes hardfaults on connection

To Reproduce
./scripts/tlay2_server.py - to connect to my UART protocol
./scripts/aaa.py - for trigger loop

Expected behavior
not crashing

Impact
It makes my device unusable

Logs and console output

It breaks on assert:

zephyr/subsys/bluetooth/controller/ll_sw/nordic/lll/lll_scan.c

Line 1195 in 6fe1299

LL_ASSERT(!radio_is_ready());

Environment (please complete the following information):

• OS: Linux
• Toolchain Zephyr SDK=0.14.2
• Commit 6fe1299

[korneliuszo]

Tried to run bt code only after bt_ready callback from bt_enable function.
Didn't help.

Stack:

Thread #8 536877040 (Name: main, prio:0,useropts:1) (Suspended : User Request)	
	arch_system_halt() at fatal.c:34 0x1a2d8	
	k_sys_fatal_error_handler() at fatal.c:46 0x1a2e0	
	z_fatal_error() at fatal.c:131 0x1a2fa	
	z_arm_fatal_error() at fatal.c:63 0x172ca	
	z_arm_fault() at fault.c:1,094 0x1f6c	
	z_arm_hard_fault() at fault_s.S:102 0x1fa6	
	<signal handler called>() at 0xfffffff1	
	isr_rx_pdu() at lll_scan.c:1,195 0x107f8	
	isr_rx() at lll_scan.c:766 0x107f8	
	isr_radio() at radio.c:140 0x11344	
	radio_nrf5_isr_body() at lll.c:93 0xf45a	
	radio_nrf5_isr() at lll.c:87 0xf45a	
	<signal handler called>() at 0xfffffffd	
	0xe500e7ea	
	0x80fffe	

[carlescufi]

@korneliuszo can you come up with a simple application that reproduces the problem? Your project is not trivial to set up.

[korneliuszo]

hang.zip
Probably beacuse of this happens.
I use irqlock in fifo.hpp for atomically read 2 pointers.

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