Some threads with DML(delete/insert ) stuck in a hang state.

mysql -e "show full processlist"|grep -iv sleep
Id User Host db Command Time State Info Rows_sent Rows_examined
2560149 <user> localhost NULL Killed 1096282 updating /*  */ DELETE FROM

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BUFFER POOL AND MEMORY
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Total large memory allocated 6596591616
Dictionary memory allocated 9403499
Buffer pool size   393168
Buffer pool size, bytes 6441664512
Free buffers       32806
Database pages     576642
Old database pages 212708
Modified db pages  439630
Pending reads      0
Pending writes: LRU 0, flush list 6, single page 0
Pages made young 12901069, not young 409442897
0.00 youngs/s, 0.00 non-youngs/s
Pages read 160589051, created 10369431, written 211927853
0.00 reads/s, 0.00 creates/s, 0.00 writes/s
Buffer pool hit rate 1000 / 1000, young-making rate 0 / 1000 not 0 / 1000
Pages read ahead 0.00/s, evicted without access 0.00/s, Random read ahead 0.00/s
LRU len: 576642, unzip_LRU len: 57894
I/O sum[0]:cur[0], unzip sum[0]:cur[0]