[GitHub] [incubator-nuttx] masayuki2009 edited a comment on pull request #5761: arch/arm: Remove the code copy register from xcpt to stack

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masayuki2009 edited a comment on pull request #5761:
URL: https://github.com/apache/incubator-nuttx/pull/5761#issuecomment-1072888807


   @anchao @xiaoxiang781216 
   
    lm3s6965-ek:qemu-protected works now.
   
   However, I noticed that a deadlock happens with raspberrypi-pico:smp.
   The same issue also happens with raspberrypi-pico:nsh (non SMP).
   Without this PR, the issues do not happen.
   
   ```
   NuttShell (NSH) NuttX-3.6.1
   nsh> uname -a
   NuttX 3.6.1 ae6658ba6e Mar 18 2022 23:27:18 arm raspberrypi-pico
   nsh> ps
     PID GROUP CPU PRI POLICY   TYPE    NPX STATE    EVENT     SIGMASK   STACK   USED  FILLED COMMAND
       0     0   0   0 FIFO     Kthread N-- Assigned           00000000 001000 000416  41.6%  CPU0 IDLE
       1     1   1   0 FIFO     Kthread N-- Running            00000000 001000 000112  11.2%  CPU1 IDLE
       2     2   0 100 RR       Task    --- Running            00000000 002024 001168  57.7%  nsh_main
   nsh> free
                      total       used       free    largest  nused  nfree
           Umem:     257728       9408     248320     248320     37      1
   nsh> ostest
   stdio_test: write fd=1
   stdio_test: Standard I/O Check: printf
   stdio_test: write fd=2
   ...
   End of test memory usage:
   VARIABLE  BEFORE   AFTER
   ======== ======== ========
   arena       3eec0    3eec0
   ordblks         2        4
   mxordblk    38490    37bc0
   uordblks     69e0     69e0
   fordblks    384e0    384e0
   
   user_main: pthread_rwlock test
   pthread_rwlock: Initializing rwlock
   ```


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