| bash-1715 [006] ..... 124.901510: copy_process: allocC ff= ffc90007e70000 | sh-cmds.sh-1746 [007] ..... 124.907389: copy_process: allocC ff= ffc90007dc4000 | <idle>-0 [019] ...1. 124.918126: free_thread_stack: cach= e ffffc90007dc4000 | sh-cmds.sh-1746 [007] ..... 124.918279: copy_process: allocC ff= ffc90007de8000 | <idle>-0 [004] ...1. 124.920121: free_thread_stack: dela= y ffffc90007de8001 | <idle>-0 [007] ...1. 124.920299: free_thread_stack: cach= e ffffc90007e70000 | <idle>-0 [007] ..s1. 124.945433: free_thread_stack: cach= e ffffc90007de8000 TS 124.901510, bash started sh-cmds.sh, obtained stack from cache. TS 124.907389, script invokes its first command, obtained stacak from cache. As you can see bash was running on CPU6 but its child was moved CPU7.=20 TS 124.918126, the first command is done, stack is ached on CPU19. TS 124.918279, script's second command, ache from stack. TS 124.920121, the command is done. The stack cache on CPU4 is full. TS 124.920299, the script is done, caches stack on CPU7. TS 124.945433, the RCU-callback of last command is now happening. On CPU7, which is where the command was invoked (but not running). Instead of freeing the stack, it was cached since CPU7 had an empty slot. If I pin the script to CPU5 and run it with multiple commands then it works as expected: | bash-1799 [005] ..... 993.608131: copy_process: allocC ff= ffc90007fa0000 | sh-cmds.sh-1827 [005] ..... 993.608888: copy_process: allocC ff= ffc90007fa8000 | sh-cmds.sh-1827 [005] ..... 993.610734: copy_process: allocV ff= ffc90007ff4000 | sh-cmds.sh-1829 [005] ...1. 993.610757: free_thread_stack: cach= e ffffc90007fa8000 | sh-cmds.sh-1827 [005] ..... 993.612401: copy_process: allocC ff= ffc90007fa8000 | <...>-1830 [005] ...1. 993.612416: free_thread_stack: cach= e ffffc90007ff4000 | sh-cmds.sh-1827 [005] ..... 993.613707: copy_process: allocC ff= ffc90007ff4000 | sh-cmds.sh-1831 [005] ...1. 993.613723: free_thread_stack: cach= e ffffc90007fa8000 | sh-cmds.sh-1827 [005] ..... 993.615024: copy_process: allocC ff= ffc90007fa8000 | <...>-1832 [005] ...1. 993.615040: free_thread_stack: cach= e ffffc90007ff4000 | sh-cmds.sh-1827 [005] ..... 993.616380: copy_process: allocC ff= ffc90007ff4000 | <...>-1833 [005] ...1. 993.616397: free_thread_stack: cach= e ffffc90007fa8000 | bash-1799 [005] ...1. 993.617759: free_thread_stack: cach= e ffffc90007fa0000 | <idle>-0 [005] ...1. 993.617871: free_thread_stack: dela= y ffffc90007ff4001 | <idle>-0 [005] ..s1. 993.638311: free_thread_stack: free= ffffc90007ff4000 and no new is allocated during its runtime and a cached stack is used. Sebastian
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