Hi Markus,

On 2022-01-18 at 12:28 -08, Markus Neteler <[email protected]> wrote:
> On Tue, Jan 18, 2022 at 9:23 PM Ken Mankoff <[email protected]> wrote:
>> I'm trying to run 'r.fillnulls' and it hangs on one computer but not on 
>> another.
>>
>
> and then run strace on it
>
> strace -p <pid>


strace prints out things like this (at about 5 Hz):


futex(0x55591e4fad24, FUTEX_WAIT_PRIVATE, 4832, NULL) = 0
futex(0x55591f6fcde4, FUTEX_WAKE_PRIVATE, 2147483647) = 16
futex(0x55591f6fcde4, FUTEX_WAIT_PRIVATE, 4928, NULL) = 0
futex(0x55591e4fad24, FUTEX_WAKE_PRIVATE, 2147483647) = 27
futex(0x55591f6fcde4, FUTEX_WAIT_PRIVATE, 4936, NULL) = -1 EAGAIN (Resource 
temporarily unavailable)
futex(0x55591f6fcde4, FUTEX_WAIT_PRIVATE, 4952, NULL) = 0
futex(0x55591e4fad24, FUTEX_WAKE_PRIVATE, 2147483647) = 35
futex(0x55591f6fcde4, FUTEX_WAIT_PRIVATE, 4960, NULL) = 0


I'm out of my depth here. It seems like a similar issue elsewhere may point to 
SSL library issues or that this is a parent thread waiting on another thread. 
From https://meenakshi02.wordpress.com/2011/02/02/strace-hanging-at-futex/ and 
'ps -efL | grep filln', there is only one other PID. If I strace that, all I 
see is

read(3,

And nothing else...

  -k.

  
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