James Peach created MESOS-7122:
----------------------------------
Summary: Process reaper should have a dedicated thread to avoid
deadlock.
Key: MESOS-7122
URL: https://issues.apache.org/jira/browse/MESOS-7122
Project: Mesos
Issue Type: Bug
Components: libprocess
Reporter: James Peach
In a test environment, we saw that libprocess can deadlock when the process
reaper is unable to run.
This happens in the Mesos HDFS client, which synchronously runs a {{hadoop}}
subprocess. If this happens too many times, the {{ReaperProcess}} is never
scheduled to reap the subprocess statuses. Since the HDFS {{Future}} never
completes, we deadlock with all the threads in the call stack below. If there
was a dedicated thread for the {{ReaperProcess}} to run on, or some other way
to endure that is is scheduled we could avoid the deadlock.
{noformat}
#0 0x00007f67b6ffc68c in pthread_cond_wait@@GLIBC_2.3.2 () from
/lib64/libpthread.so.0
#1 0x00007f67b6da12fc in
std::condition_variable::wait(std::unique_lock<std::mutex>&) () from
/usr/lib64/libstdc++.so.6
#2 0x00007f67b8b864f6 in process::ProcessManager::wait(process::UPID const&)
() from /usr/lib64/libmesos-1.2.0.so
#3 0x00007f67b8b8d347 in process::wait(process::UPID const&, Duration const&)
() from /usr/lib64/libmesos-1.2.0.so
#4 0x00007f67b8b51a85 in process::Latch::await(Duration const&) () from
/usr/lib64/libmesos-1.2.0.so
#5 0x00007f67b834fc9f in process::Future<Bytes>::await(Duration const&) const
() from /usr/lib64/libmesos-1.2.0.so
#6 0x00007f67b833d700 in
mesos::internal::slave::fetchSize(std::basic_string<char,
std::char_traits<char>, std::allocator<char> > const&,
Option<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >
const&) () from /usr/lib64/libmesos-1.2.0.so
#7 0x00007f67b833df5e in
std::result_of<mesos::internal::slave::FetcherProcess::fetch(mesos::ContainerID
const&, mesos::CommandInfo const&, std::basic_string<char,
std::char_traits<char>, std::allocator<char> > const&,
Option<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >
const&, mesos::SlaveID const&, mesos::internal::slave::Flags
const&)::{lambda()#2} ()()>::type
process::AsyncExecutorProcess::execute<mesos::internal::slave::FetcherProcess::fetch(mesos::ContainerID
const&, mesos::CommandInfo const&, std::basic_string<char,
std::char_traits<char>, std::allocator<char> > const&,
Option<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >
const&, mesos::SlaveID const&, mesos::internal::slave::Flags
const&)::{lambda()#2}>(std::result_of const&, boost::disable_if<std::result_of
const&::is_void<std::result_of<mesos::internal::slave::FetcherProcess::fetch(mesos::ContainerID
const&, mesos::CommandInfo const&, std::basic_string<char,
std::char_traits<char>, std::allocator<char> > const&,
Option<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >
const&, mesos::SlaveID const&, mesos::internal::slave::Flags
const&)::{lambda()#2} ()()> >, void>::type*) () from
/usr/lib64/libmesos-1.2.0.so
#8 0x00007f67b833a3d5 in std::_Function_handler<void
()(process::ProcessBase*), process::Future<Try<Bytes, Error> >
process::dispatch<Try<Bytes, Error>, process::AsyncExecutorProcess,
mesos::internal::slave::FetcherProcess::fetch(mesos::ContainerID const&,
mesos::CommandInfo const&, std::basic_string<char, std::char_traits<char>,
std::allocator<char> > const&, Option<std::basic_string<char,
std::char_traits<char>, std::allocator<char> > > const&, mesos::SlaveID const&,
mesos::internal::slave::Flags const&)::{lambda()#2} const&, void*,
{lambda()#2}, mesos::internal::slave::FetcherProcess::fetch(mesos::ContainerID
const&, mesos::CommandInfo const&, std::basic_string<char,
std::char_traits<char>, std::allocator<char> > const&,
Option<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >
const&, mesos::SlaveID const&, mesos::internal::slave::Flags
const&)::{lambda()#2} const&>(process::PID<process::AsyncExecutorProcess>
const&, process::Future
(process::PID::*)(mesos::internal::slave::FetcherProcess::fetch(mesos::ContainerID
const&, mesos::CommandInfo const&, std::basic_string<char,
std::char_traits<char>, std::allocator<char> > const&,
Option<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >
const&, mesos::SlaveID const&, mesos::internal::slave::Flags
const&)::{lambda()#2} const&, void*), {lambda()#2},
mesos::internal::slave::FetcherProcess::fetch(mesos::ContainerID const&,
mesos::CommandInfo const&, std::basic_string<char, std::char_traits<char>,
std::allocator<char> > const&, Option<std::basic_string<char,
std::char_traits<char>, std::allocator<char> > > const&, mesos::SlaveID const&,
mesos::internal::slave::Flags const&)::{lambda()#2}
const&)::{lambda(process::ProcessBase*)#1}>::_M_invoke(std::_Any_data const&,
process::ProcessBase*) () from /usr/lib64/libmesos-1.2.0.so
#9 0x00007f67b8b85ede in
process::ProcessManager::resume(process::ProcessBase*) () from
/usr/lib64/libmesos-1.2.0.so
#10 0x00007f67b8b8fc8f in
std::thread::_Impl<std::_Bind_simple<process::ProcessManager::init_threads()::{unnamed
type#1} ()()> >::_M_run() () from /usr/lib64/libmesos-1.2.0.so
#11 0x00007f67b6da1470 in ?? () from /usr/lib64/libstdc++.so.6
#12 0x00007f67b6ff8aa1 in start_thread () from /lib64/libpthread.so.0
#13 0x00007f67b6a3faad in clone () from /lib64/libc.so.6
{noformat}
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