message pool issue

[waynewyang]

Describe the bug
in the outage test,t02520 cannot package his own messages because the message selection issue , and the others also cannot package t02520' messages.

To Reproduce
Steps to reproduce the behavior:

1. Run

• in the outage test

2. See error
   t02520 cannot package his own messages because the message pool issue , and the others also cannot package t02520' messages, the error is below,

2020-09-10T05:15:08.547Z	INFO	sectors	storage-sealing/states_failed.go:25	pushing message to mpool: add locked failed: too many pending messages for actor(%!d(sealing.SectorState=PreCommitFailed)), waiting 190233 before retrying%!(EXTRA time.Duration=59.45299959s)
2020-09-10T05:15:08.603Z	WARN	sectors	storage-sealing/fsm.go:648	sector 190263 got error event sealing.SectorChainPreCommitFailed: pushing message to mpool: add locked failed: too many pending messages for actor
2020-09-10T05:15:08.619Z	INFO	sectors	storage-sealing/states_failed.go:25	pushing message to mpool: add locked failed: too many pending messages for actor(%!d(sealing.SectorState=PreCommitFailed)), waiting 190263 before retrying%!(EXTRA time.Duration=59.380725596s)
2020-09-10T05:15:08.683Z	WARN	sectors	storage-sealing/fsm.go:648	sector 187139 got error event sealing.SectorChainPreCommitFailed: pushing message to mpool: add locked failed: too many pending messages for actor

and at this moment , the mpool if full for. t02520.

# lotus mpool pending | grep  t02520  | wc -l
1000

Expected behavior
t02520 which can win block can package his own messages and the others which win the block also can package t02520

Screenshots

*jsonrpc.respError=&{1 add locked failed: too many pending messages for actor}
# lotus mpool pending | grep  t02520  | wc -l
1000

Version (run lotus version):
v0.6.2

Additional context
I think the limit is have a problem, I suggest to intercept part of the messages (if chain.gasLimit > gaslimit) and push them into the message pool

		if chain.gasLimit <= gasLimit {
			gasLimit -= chain.gasLimit
			result = append(result, chain.msgs...)
			continue
		}

https://github.com/filecoin-project/lotus/blob/master/chain/messagepool/selection.go#L569-L573

@whyrusleeping @jbenet

[vyzo]

this is a spam control limit being hit; we can relax the limit for local pushes.

[vyzo]

Note that this has nothing to do with selection, it's a preemptive check that forbids the message from entering the message pool.

[waynewyang]

I've changed the issue title to "mpool issue",the outage test is very useful~

[vyzo]

fix in #3724.