[GitHub] [incubator-nuttx] GUIDINGLI opened a new pull request #2960: sigdeliver: fix system block when kill signal to idle in SMP

[GitBox]

GUIDINGLI opened a new pull request #2960:
URL: https://github.com/apache/incubator-nuttx/pull/2960


   ## Summary
   sigdeliver: fix system block when kill signal to idle in SMP
   
       Bug description:
       
       CONFIG_SMP=y
       
       Suppose we have 2 cores in SMP, here is the ps return:
       
       PID GROUP CPU PRI POLICY TYPE    NPX STATE     STACK   USED  FILLED 
COMMAND
         0     0   0   0 FIFO   Kthread N-- Assigned 004076 000748  18.3%  CPU0 
IDLE
         1     0   1   0 FIFO   Kthread N-- Running  004096 000540  13.1%  CPU1 
IDLE
       
       nsh> kill -4 0
       or:
       nsh> kill -4 1
       
       system blocked.
       
       Reason:
       
       In func xx_sigdeliver() restore stage, when saved_irqcount == 0, that 
means
       rtcb NOT in critical_section before switch to xx_sigdeliver(), then we 
need
       reset the critical_section state before swith back.
       
       Fix:
       
       Add condition to cover saved_irqcount == 0.
   
   
   ## Impact
   
   ## Testing
   
   


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