gcoap example crashes on LLVM #17591
Description
Description
The gcoap example, run on microbit-v2, currently crashes right after startup when using LLVM.
Steps to reproduce the issue
On current master:
$ make -C examples/gcoap BOARD=microbit-v2 all flash term TOOLCHAIN=llvm BUILD_IN_DOCKER=1
[...]
[press reset because terminal doesn't start fast enough to catch error]
(BUILD_IN_DOCKER for better reproducibility; effect is the same on my local system).
Expected results
Get a shell. (As happens when not overriding the toolchain).
Actual results
2022-01-30 15:02:37,698 # NETOPT_RX_END_IRQ not implemented by driver
2022-01-30 15:02:37,702 # NETOPT_TX_END_IRQ not implemented by driver
2022-01-30 15:02:37,706 # main(): This is RIOT! (Version:0xb579
2022-01-30 15:02:37,708 # *** RIOT kernel panic:
2022-01-30 15:02:37,709 # FAILED ASSERTION.
2022-01-30 15:02:37,710 #
2022-01-30 15:02:37,718 # pid | name | state Q | pri | stack ( used) ( free) | base addr | current
2022-01-30 15:02:37,727 # - | isr_stack | - - | - | 512 ( 224) ( 288) | 0x20000000 | 0x200001c8
2022-01-30 15:02:37,736 # 1 | main | pending Q | 7 | 1536 ( 496) ( 1040) | 0x200005cc | 0x200009dc
2022-01-30 15:02:37,744 # 2 | 6lo | bl rx _ | 3 | 1024 ( 368) ( 656) | 0x20003698 | 0x2000398c
2022-01-30 15:02:37,753 # 3 | ipv6 | bl rx _ | 4 | 1024 ( 368) ( 656) | 0x20001274 | 0x2000153c
2022-01-30 15:02:37,762 # 4 | udp | bl rx _ | 5 | 1024 ( 264) ( 760) | 0x20003e7c | 0x20004174
2022-01-30 15:02:37,770 # 5 | coap | bl anyfl _ | 6 | 1108 ( 220) ( 888) | 0x20000ccc | 0x20001044
2022-01-30 15:02:37,779 # 6 | nrf802154 | running Q | 2 | 1024 ( 716) ( 308) | 0x200019f8 | 0x20001ca4
2022-01-30 15:02:37,786 # | SUM | | | 7252 ( 2656) ( 4596)
2022-01-30 15:02:37,787 #
2022-01-30 15:02:37,787 # *** halted.
Versions
Current master is 4aa173d
OS and build versions shouldn't matter, for it's all built in docker (but behaves the same on Debian GNU/Linux with GCC with clang 13.0.1-+rc3-1~exp1)