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Process is hangover (stuck) when call DynamicSupervisor.start_child/2 from children of the DynamicSupervisor

#dynamicsupervisor
manhvu

manhvu

Process is hangover (stuck) when call DynamicSupervisor.start_child/2 from children of the DynamicSupervisor

My case:
Application starts a DynamicSupervisor and a GenServer for adding children to DynamicSupervisor.
GenServer make children when received tasks from outside.
Each child after made by GenServer will make other children from inside process in parallel.

My issue: Children process will be hangover when calling DynamicSupervisor.start_child/2. Any one know about this issue?

15 comments
#dynamicsupervisor
7 538 15

Marked As Solved

manhvu

manhvu

From question of @TamLyNhat I think my code was deadlock.

For detail:
Children call again start_child/2 in init function while the supervisor is still waiting result from init (call from last `start_child/2’).

I will test again to verify this case.

Post #12

Also Liked

al2o3cr

al2o3cr

This sounds like exactly the sort of thing that :continue and handle_continue are designed to prevent - moving the start_child call from init to handle_continue should prevent the deadlock.

5
Post #13
TamLyNhat

TamLyNhat

Hi,

As I remembered, I have experienced a case when GenServer does not send the response reply to the caller, and this process still calls some other functions, and sends the handle_call/handle_cast message to this GenServer, it jumps into loop infinity because this process of GenServer sends the message to itself which does not release yet.
Seem likes you are facing a similar case I encountered before.

1
Post #7
dimitarvp

dimitarvp

I honestly have no idea what you just said, sorry man. :smiley:

1
Post #15

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