Segmentation fault in nrf_log_frontend.c when writing string onto USB CDC-ACM iface

Question

Hello, 
 when writing content onto the CDC-ACM interface of the nrf52840, I sooner or later always end up in a Segmentation fault. 
 I'm on nRF52840 and using the SDK v16. 
 I'm writing the string "ABCDEFGHIJKLMNOPQRSTOVWXYZ" - per byte, using a pp_usbd_cdc_acm_write(&m_app_cdc_acm, &byte, 1); - looping through the string. 
 The Segmentation fault happens in total different scenarios with different code and structures. 
 What's always the same though is, that my debugger shows it happening in: 
 Program received signal SIGSEGV, Segmentation fault. 0x0002786e in nrf_log_backend_flush (warning: while parsing target memory map (at line 1): Required element <memory> is missing p_backend=0x1) at ../../../../../../components/libraries/log/nrf_log_backend_interface.h:235 235 p_backend->p_api->flush(p_backend); 
 while the backtrace is an infinite scrolling of: 
 #0 0x0002786e in nrf_log_backend_flush (p_backend=0x1) at ../../../../../../components/libraries/log/nrf_log_backend_interface.h:235 #1 nrf_log_frontend_dequeue () at ../../../../../../components/libraries/log/src/nrf_log_frontend.c:895 #2 0x000277be in nrf_log_frontend_dequeue () at ../../../../../../components/libraries/log/src/nrf_log_frontend.c:556 #3 std_n (args=0x0, nargs=0, p_str=0x3606c "Backends flushed", severity_mid=393218) at ../../../../../../components/libraries/log/src/nrf_log_frontend.c:562 #4 nrf_log_frontend_std_0 (severity_mid=393218, p_str=p_str@entry=0x3606c "Backends flushed") at ../../../../../../components/libraries/log/src/nrf_log_frontend.c:573 #5 0x0002788e in nrf_log_frontend_dequeue () at ../../../../../../components/libraries/log/src/nrf_log_frontend.c:898 #6 0x000277be in nrf_log_frontend_dequeue () at ../../../../../../components/libraries/log/src/nrf_log_frontend.c:556 #7 std_n (args=0x0, nargs=0, p_str=0x3606c "Backends flushed", severity_mid=393218) at ../../../../../../components/libraries/log/src/nrf_log_frontend.c:562 #8 nrf_log_frontend_std_0 (severity_mid=393218, p_str=p_str@entry=0x3606c "Backends flushed") at ../../../../../../components/libraries/log/src/nrf_log_frontend.c:573 #9 0x0002788e in nrf_log_frontend_dequeue () at ../../../../../../components/libraries/log/src/nrf_log_frontend.c:898 #10 0x000277be in nrf_log_frontend_dequeue () at ../../../../../../components/libraries/log/src/nrf_log_frontend.c:556 #11 std_n (args=0x0, nargs=0, p_str=0x3606c "Backends flushed", severity_mid=393218) at ../../../../../../components/libraries/log/src/nrf_log_frontend.c:562 #12 nrf_log_frontend_std_0 (severity_mid=393218, p_str=p_str@entry=0x3606c "Backends flushed") at ../../../../../../components/libraries/log/src/nrf_log_frontend.c:573s #13 0x0002788e in nrf_log_frontend_dequeue () at ../../../../../../components/libraries/log/src/nrf_log_frontend.c:898 #14 0x000277be in nrf_log_frontend_dequeue () at ../../../../../../components/libraries/log/src/nrf_log_frontend.c:556 #15 std_n (args=0x0, nargs=0, p_str=0x3606c "Backends flushed", severity_mid=393218) at ../../../../../../components/libraries/log/src/nrf_log_frontend.c:562 #16 nrf_log_frontend_std_0 (severity_mid=393218, p_str=p_str@entry=0x3606c "Backends flushed") at ../../../../../../components/libraries/log/src/nrf_log_frontend.c:573 #17 0x0002788e in nrf_log_frontend_dequeue () at ../../../../../../components/libraries/log/src/nrf_log_frontend.c:898 [..] 
 
 I'm happy to create and provide a minimal test case, however the always same, yet seemingly unrelated backtrace (nrf_log_frontend) as well as the correlation with using app_usbd_cdc_acm_write () makes me wonder whether I should start looking somewhere else for its cause. 
 I'd be happy for any hint!