进程异常abort

[lorinlee]

Describe the bug (描述bug)
偶尔会进程abort，有core现场

To Reproduce (复现方法)
未知

Expected behavior (期望行为)
进程不退出

Versions (各种版本)
OS: Linux 4.9.0
Compiler: gcc4.9.2
brpc: commit log 74abadb
protobuf: 3.5.1

Additional context/screenshots (更多上下文/截图)

#0 0x00007f1b7b60a067 in raise () from libc.so.6
#1 0x00007f1b7b60b448 in abort () from libc.so.6
#2 0x00007f1b7f044eb9 in google::DumpStackTraceAndExit () at src/utilities.cc:147
#3 0x00007f1b7f03bc0d in google::LogMessage::Fail () at src/logging.cc:1458
#4 0x00007f1b7f03e3f3 in google::LogMessageFatal::~LogMessageFatal (this=0x7f1b3d1feda0, __in_chrg=) at src/logging.cc:1985
#5 0x00007f1b7f607d24 in release_tls_block_chain (b=) at src/butil/iobuf.cpp:433
#6 butil::IOPortal::return_cached_blocks_impl (b=0x7f1a28fea000) at src/butil/iobuf.cpp:1808
#7 0x00007f1b7f70bde6 in return_cached_blocks (this=0x7f1aa2092390) at ./src/butil/iobuf_inl.h:43
#8 brpc::InputMessenger::OnNewMessages (m=0x7f1aa20922c0) at src/brpc/input_messenger.cpp:264
#9 0x00007f1b7f6e3bad in brpc::Socket::ProcessEvent (arg=0x7f1aa20922c0) at src/brpc/socket.cpp:1061
#10 0x00007f1b7f652651 in bthread::TaskGroup::task_runner (skip_remained=) at src/bthread/task_group.cpp:293
#11 0x00007f1b7f6425b1 in bthread_make_fcontext () from libbrpc.so
#12 0x0000000000000000 in ?? ()

[choleraehyq]

补充一下，使用的协议是 thrift，这个不知道有没有关系

[lorinlee]

#648 猜测了一种可能性并尝试了fix，在acquire tls block的时候可能会拿到一个full的block，比如使用IOBuf::append将当前tls的头部block写满了，然后有bthread release了一个block，后面append再次将这个block写满，tls会有两个full的block，按当前的实现acquire的时候会拿到一个full的block，在release的时候会abort，辛苦review @jamesge