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Posted to commits@nuttx.apache.org by GitBox <gi...@apache.org> on 2021/02/01 12:49:04 UTC

[GitHub] [incubator-nuttx] patacongo commented on issue #2663: kthread_create hangs waiting on semaphore while trying to copy file descriptors

patacongo commented on issue #2663:
URL: https://github.com/apache/incubator-nuttx/issues/2663#issuecomment-770832369


   > @xiaoxiang781216 I just noticed something similar when trying to create a kernel thread off of a call in `sim_bringup()` (I'm add usbhost support via libusb). I get a segfault because in `sched_dupfiles` `rtcb->group` is 0 which means parent and child are both invalid
   
   This is probably running on the IDLE thread which has no parent and the PID for the IDLE thread always zero.  Zero does not mean invalid anywhere except in the case of the parent PID here.
   
   The meaning PID of zero is overloaded elsewhere too:  In several POSIX APIs, PID == 0 means "this task."  But that is not an issue here.
   


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