3300578 - IQ hang with forbid mutex held by task - SAP IQ

IQ hang with forbid mutex held by task.

In the srvlog:

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W. 02/06 03:54:21.109155 Task 0x17b3cb0(Request task 127) is trying get forbid mutex held by task 0x17c1d20(Request task 184) for more than 60000 ms
W. 02/06 03:54:21.109242 Task 0x17c1d20(Request task 184) state: OS thread id=0x7f92ca65d700
W. 02/06 03:54:21.109263 Task 0x17c1d20(Request task 184) state: worker=0x7f92780008c0 wakend=1 waiting=0
W. 02/06 03:54:21.109312 Worker 0x7f92780008c0 state: wakend=0 waiting=0 in_atomic=0 is_dedicated=0 in_critical_section=0 allow_forbid=1

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In the IQMSGS:

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I. 02/06 03:53:21. 0004575787 IQ Checkpoint position: 0
I. 02/06 03:53:21. 0000000657 [20919]: 
Delete of 24124 rows completed for table: #tb0001, 1341 seconds.
I. 02/06 03:58:05. 0004575787 Chk
I. 02/06 03:58:05. 0004575787 ChkDone [NumTxnCP: 37]
I. 02/06 03:58:05. 0004575787 IQ Checkpoint block: 629202
I. 02/06 03:58:05. 0004575787 PostChk

SAP IQ 16.1 SP04 PL10

Unresponsive, hang, deadlock, hangup, "hang up", forbid mutex , KBA , BC-SYB-IQ , Sybase IQ , Problem