cyb70289 commented on pull request #12442:
URL: https://github.com/apache/arrow/pull/12442#issuecomment-1081810625


   > > In my /etc/hosts, there's a line `::1 localhost ip6-localhost 
ip6-loopback`, comment out this line resolves this issue.
   > 
   > Thanks, I'll give that a shot to replicate.
   
   Full /etc/hosts in my machine
   ```
   127.0.0.1   localhost
   
   # The following lines are desirable for IPv6 capable hosts
   ::1     localhost ip6-localhost ip6-loopback
   ff02::1 ip6-allnodes
   ff02::2 ip6-allrouters
   ```
   
   > 
   > > `send_data` is nullptr.
   > 
   > Interesting - I ran into this case myself but thought I guarded it. Will 
also take a look shortly. Thank you! (I guess, pending_iov->iovs is size 0, 
data() is nullptr? I wonder if we accidentally had undefined behavior in the 
case that there are 0 body buffers.)
   
   Yes, pending_iov->iovs is empty vector, at line 
https://github.com/lidavidm/arrow/blob/flight-ucx/cpp/src/arrow/flight/transport/ucx/ucx_internal.cc#L753
   
   


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