Chia-Ping Tsai created YUNIKORN-793:
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Summary: fix deadlock caused by listing queues with scheduling
pending pods
Key: YUNIKORN-793
URL: https://issues.apache.org/jira/browse/YUNIKORN-793
Project: Apache YuniKorn
Issue Type: Bug
Reporter: Chia-Ping Tsai
`GetPartitionQueues` calls read lock multiple times. If there is a thread which
is waiting write lock, it can exclude all new read locks. In short, the
following execution order can cause dead lock.
1. hold read lock ---> thread 0
2. wait write lock ---> thread 1 is locked by thread 0
3. acquire read lock ---> thread 0 is locked by thread 1
see docs for more details ([https://pkg.go.dev/sync#RWMutex])
The pprof is shown below.
{noformat}
1 @ 0x43ada5 0x44ca85 0x44ca6e 0x46de27 0x47ce25 0x47e590 0x47e522 0x9c5753
0x9ad231 0x9fbcfa 0x9e4986 0x9e4851 0x9de655 0x9ff792 0x471c61
# 0x46de26 sync.runtime_SemacquireMutex+0x46
/Users/chia7712/Library/go/default/src/runtime/sema.go:71
# 0x47ce24 sync.(*Mutex).lockSlow+0x104
/Users/chia7712/Library/go/default/src/sync/mutex.go:138
# 0x47e58f sync.(*Mutex).Lock+0x8f
/Users/chia7712/Library/go/default/src/sync/mutex.go:81
# 0x47e521 sync.(*RWMutex).Lock+0x21
/Users/chia7712/Library/go/default/src/sync/rwmutex.go:111
# 0x9c5752
github.com/apache/incubator-yunikorn-core/pkg/scheduler/objects.(*Queue).incPendingResource+0x52
/Users/chia7712/go/pkg/mod/github.com/chia7712/[email protected]/pkg/scheduler/objects/queue.go:454
1 @ 0x43ada5 0x44ca85 0x44ca6e 0x46de27 0x9c7eae 0x9c7e34 0x9c51f8 0x9c54ab
0xa59e45 0xa59e94 0x711024 0xa5b310 0x711024 0xa011b3 0x7145e3 0x70fb0d 0x471c61
# 0x46de26 sync.runtime_SemacquireMutex+0x46
/Users/chia7712/Library/go/default/src/runtime/sema.go:71
# 0x9c7ead sync.(*RWMutex).RLock+0xad
/Users/chia7712/Library/go/default/src/sync/rwmutex.go:63
# 0x9c7e33
github.com/apache/incubator-yunikorn-core/pkg/scheduler/objects.(*Queue).IsLeafQueue+0x33
/Users/chia7712/go/pkg/mod/github.com/chia7712/[email protected]/pkg/scheduler/objects/queue.go:667
# 0x9c51f7
github.com/apache/incubator-yunikorn-core/pkg/scheduler/objects.(*Queue).GetPartitionQueues+0x1f7
/Users/chia7712/go/pkg/mod/github.com/chia7712/[email protected]/pkg/scheduler/objects/queue.go:426
# 0x9c54aa
github.com/apache/incubator-yunikorn-core/pkg/scheduler/objects.(*Queue).GetPartitionQueues+0x4aa
/Users/chia7712/go/pkg/mod/github.com/chia7712/[email protected]/pkg/scheduler/objects/queue.go:416
{noformat}
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