Writer can't acquire write lock

[realSinged]

Writer can't acquire write lock

[linmianhao]

Could you provide a demo that reproduces this issue? I can take some time to solve it.

[realSinged]

hi，the snippet is in our biz code. but I already know how to reproduce it.

1. create a writer write to channel with high frenquency.
2. create a reader read from this channel.
3. make writer and reader exit abnormal（for example in anthoer thread）
4. make sure reader and writer always restart automatically.
5. run for a while

then you will find some block's block num is -1 or 1 forever.

reader may not release lock if process quit when reader thread execute between AcquireBlockToRead and ReleaseReadBlock. and so does the writer.

[realSinged]

@daohu527