Usage fault下没输出关键的call_stack信息

[ueJone]

和bt库似乎没关系，后来增加调试信息发现print_call_stack()执行一半mcu就停止运行了，最重要的调用关系没来得及打印，不知道为什么会没执行到最后

[5103078] E/cmb: 
[5103078] E/cmb: Firmware name: rtthread, hardware version: 1.0, software version: 1.0
[5103078] E/cmb: Fault on interrupt or bare metal(no OS) environment
[5103078] E/cmb: ===== Thread stack information =====
[5103078] E/cmb:   addr: 24000a18    data: 9000040b
[5103078] E/cmb:   addr: 24000a1c    data: fffffff1
[5103078] E/cmb:   addr: 24000a20    data: fffffff1
[5103078] E/cmb:   addr: 24000a24    data: fffffff1
[5103078] E/cmb:   addr: 24000a28    data: 00000000
[5103078] E/cmb:   addr: 24000a2c    data: 24000310
[5103078] E/cmb:   addr: 24000a30    data: 24000310
[5103078] E/cmb:   addr: 24000a34    data: 00000000
[5103078] E/cmb:   addr: 24000a38    data: 00000000
[5103078] E/cmb:   addr: 24000a3c    data: 7ffffffe
[5103078] E/cmb:   addr: 24000a40    data: 24001084
[5103078] E/cmb:   addr: 24000a44    data: deadbeef
[5103078] E/cmb:   addr: 24000a48    data: 00000000
[5103078] E/cmb:   addr: 24000a4c    data: 00000000
[5103078] E/cmb:   addr: 24000a50    data: 2400fda4
[5103078] E/cmb:   addr: 24000a54    data: 684a171c
[5103078] E/cmb:   addr: 24000a58    data: 00000000
[5103078] E/cmb:   addr: 24000a5c    data: 90004847
[5103078] E/cmb:   addr: 24000a60    data: 900239aa
[5103078] E/cmb:   addr: 24000a64    data: 0100000f
[5103078] E/cmb:   addr: 24000a68    data: 00000000
[5103078] E/cmb:   addr: 24000a6c    data: 24000df4
[5103078] E/cmb:   addr: 24000a70    data: 24013004
[5103078] E/cmb:   addr: 24000a74    data: 24012ff0
[5103078] E/cmb:   addr: 24000a78    data: 24000df4
[5103078] E/cmb:   addr: 24000a7c    data: 90004847
[5103078] E/cmb:   addr: 24000a80    data: 00000004
[5103078] E/cmb:   addr: 24000a84    data: 24000c6c
[5103078] E/cmb:   addr: 24000a88    data: deadbeef
[5103078] E/cmb:   addr: 24000a8c    data: deadbeef
[5103078] E/cmb:   addr: 24000a90    data: deadbeef
[5103078] E/cmb:   addr: 24000a94    data: deadbeef
[5103078] E/cmb:   addr: 24000a98    data: deadbeef
[5103078] E/cmb:   addr: 24000a9c    data: 9002184f
[5103078] E/cmb:   addr: 24000aa0    data: 00000000
[5103078] E/cmb:   addr: 24000aa4    data: fffffffd
[5103078] E/cmb:   addr: 24000aa8    data: 24000acc
[5103078] E/cmb:   addr: 24000aac    data: 10000000
[5103078] E/cmb:   addr: 24000ab0    data: 00000000
[5103078] E/cmb:   addr: 24000ab4    data: 00000003
[5103078] E/cmb:   addr: 24000ab8    data: 00000020
[5103078] E/cmb:   addr: 24000abc    data: 9000193f
[5103078] E/cmb:   addr: 24000ac0    data: 900003d6
[5103078] E/cmb:   addr: 24000ac4    data: 21000200
[5103078] E/cmb:   addr: 24000ac8    data: 90021453
[5103078] E/cmb: ====================================
[5103078] E/cmb: =================== Registers information ====================
[5103078] E/cmb:   R0 : 06000000  R1 : 24003080  R2 : 24000a20  R3 : 00000000
[5103078] E/cmb:   R12: 90004ab5  LR : 684a171c  PC : 00000000  PSR: 24000310
[5103078] E/cmb: ==============================================================
[5103078] E/cmb: Usage fault is caused by attempts to execute an undefined instruction

[chenyingchun0312]

我这边也出现同样的问题， 原因我这边大致找到了，在打印堆栈调用信息的地方，如果使用的是ulog日志模块，那么打印不出来，只需要 print_call_stack 函数中， cmb_println(print_info[PRINT_CALL_STACK_INFO], fw_name, CMB_ELF_FILE_EXTENSION_NAME, cur_depth * (8 + 1), call_stack_info); 中， cmb_println 替换成 rt_kprintf，堆栈调用信息就可以打印出来了。

[ueJone]

我这边也出现同样的问题， 原因我这边大致找到了，在打印堆栈调用信息的地方，如果使用的是ulog日志模块，那么打印不出来，只需要 print_call_stack 函数中， cmb_println(print_info[PRINT_CALL_STACK_INFO], fw_name, CMB_ELF_FILE_EXTENSION_NAME, cur_depth * (8 + 1), call_stack_info); 中， cmb_println 替换成 rt_kprintf，堆栈调用信息就可以打印出来了。

有道理，系统崩溃的时候ulog线程不一定能跑，谢谢提醒，我验证一下您的方法。