Attempt to Divide by Zero in Inflation

[AurevoirXavier]

Thread 'import-queue-worker-0' panicked at 'attempt to divide by zero', /Users/xavier/Documents/program/darwinia-network/darwinia/frame/staking/src/inflation.rs:36

[AurevoirXavier]

#129

#171

[AurevoirXavier]

2020-03-12 16:05:06.752 import-queue-worker-0 DEBUG inflation
era_duration: 534000,
living_time: 18446744073709228891,
total_left: 799997999000000000,
payout_fraction: Perbill(
    500000000,
)
maximum: 13537117254354
year: 584542047

====================

Version: 0.5.0-6155b46-x86_64-macos

   0: backtrace::backtrace::trace
   1: backtrace::capture::Backtrace::new
   2: sp_panic_handler::set::{{closure}}
   3: std::panicking::rust_panic_with_hook
   4: rust_begin_unwind
   5: core::panicking::panic_fmt
   6: core::panicking::panic
   7: darwinia_staking::inflation::compute_total_payout
   8: <darwinia_staking::Module<T> as pallet_session::SessionManager<<T as frame_system::Trait>::AccountId>>::new_session
   9: <(TupleElement0, TupleElement1) as sp_runtime::traits::OnInitialize<BlockNumber>>::on_initialize
  10: <(TupleElement0, TupleElement1) as sp_runtime::traits::OnInitialize<BlockNumber>>::on_initialize
  11: <(TupleElement0, TupleElement1) as sp_runtime::traits::OnInitialize<BlockNumber>>::on_initialize
  12: <(TupleElement0, TupleElement1) as sp_runtime::traits::OnInitialize<BlockNumber>>::on_initialize
  13: <(TupleElement0, TupleElement1) as sp_runtime::traits::OnInitialize<BlockNumber>>::on_initialize
  14: <(TupleElement0, TupleElement1) as sp_runtime::traits::OnInitialize<BlockNumber>>::on_initialize
  15: frame_executive::Executive<System,Block,Context,UnsignedValidator,AllModules>::initialize_block
  16: frame_executive::Executive<System,Block,Context,UnsignedValidator,AllModules>::execute_block
  17: <node_runtime::Runtime as sp_api::runtime_decl_for_Core::Core<sp_runtime::generic::block::Block<sp_runtime::generic::header::Header<u32,sp_runtime::traits::BlakeTwo256>,sp_runtime::generic::unchecked_extrinsic::UncheckedExtrinsic<<pallet_indices::Module<node_runtime::Runtime> as sp_runtime::traits::StaticLookup>::Source,node_runtime::Call,sp_runtime::MultiSignature,(frame_system::CheckVersion<node_runtime::Runtime>, frame_system::CheckGenesis<node_runtime::Runtime>, frame_system::CheckEra<node_runtime::Runtime>, frame_system::CheckNonce<node_runtime::Runtime>, frame_system::CheckWeight<node_runtime::Runtime>, pallet_transaction_payment::ChargeTransactionPayment<node_runtime::Runtime>, pallet_contracts::CheckBlockGasLimit<node_runtime::Runtime>)>>>>::execute_block
  18: std::panicking::try::do_call
  19: __rust_maybe_catch_panic
  20: std::thread::local::LocalKey<T>::with
  21: std::thread::local::LocalKey<T>::with
  22: sp_state_machine::StateMachine<B,H,N,Exec>::execute_aux
  23: sp_state_machine::StateMachine<B,H,N,Exec>::execute_using_consensus_failure_handler
  24: <sc_client::call_executor::LocalCallExecutor<B,E> as sc_client_api::call_executor::CallExecutor<Block>>::contextual_call
  25: <sc_client::client::Client<B,E,Block,RA> as sp_api::CallApiAt<Block>>::call_api_at
  26: sp_api::runtime_decl_for_Core::execute_block_call_api_at
  27: sp_api::Core::execute_block
  28: <&sc_client::client::Client<B,E,Block,RA> as sp_consensus::block_import::BlockImport<Block>>::import_block
  29: <sc_finality_grandpa::import::GrandpaBlockImport<BE,Block,Client,SC> as sp_consensus::block_import::BlockImport<Block>>::import_block
  30: <sc_consensus_babe::BabeBlockImport<Block,Client,Inner> as sp_consensus::block_import::BlockImport<Block>>::import_block
  31: sp_consensus::import_queue::import_single_block
  32: <futures_util::future::poll_fn::PollFn<F> as core::future::future::Future>::poll
  33: futures_util::future::future::chain::Chain<Fut1,Fut2,Data>::poll
  34: <futures_util::future::poll_fn::PollFn<F> as core::future::future::Future>::poll
  35: futures_executor::thread_pool::PoolState::work
  36: std::sys_common::backtrace::__rust_begin_short_backtrace
  37: std::panicking::try::do_call
  38: __rust_maybe_catch_panic
  39: core::ops::function::FnOnce::call_once{{vtable.shim}}
  40: <alloc::boxed::Box<F> as core::ops::function::FnOnce<A>>::call_once
  41: std::sys::unix::thread::Thread::new::thread_start
  42: _pthread_start


Thread 'import-queue-worker-0' panicked at 'attempt to divide by zero', /Users/xavier/Documents/program/darwinia-network/darwinia/frame/staking/src/inflation.rs:53

This is a bug. Please report it at:

	https://github.com/darwinia-network/darwinia/issues/new

2020-03-12 16:05:06.787 import-queue-worker-0 WARN sc_client::client  Block prepare storage changes error:
Execution(RuntimePanicked("attempt to divide by zero"))

---

era_duration: 534000,
living_time: 18446744073709228891,
total_left: 799997999000000000,
payout_fraction: Perbill(
    500000000,
)
maximum: 13537117254354
year: 584542047

[AurevoirXavier]

Move genesis time into chain spec's gensis config.