Why server went to unresponsive state showing filesystem in frozen state ?

Issue

• Server went to unresponsive state showing following traces :

PID: 12377  TASK: ffff8109b616d0c0  CPU: 16  COMMAND: "logmon"
 #0 [ffff8111d4c57c18] schedule at ffffffff80062fa0
 #1 [ffff8111d4c57cf0] __generic_file_aio_write_nolock at ffffffff800164fc
 #2 [ffff8111d4c57d90] generic_file_aio_write at ffffffff80021e10
 #3 [ffff8111d4c57de0] ext3_file_write at ffffffff8804c372 [ext3]
 #4 [ffff8111d4c57e00] do_sync_write at ffffffff800183d1
 #5 [ffff8111d4c57f10] vfs_write at ffffffff80016b4e
 #6 [ffff8111d4c57f40] sys_write at ffffffff80017417
 #7 [ffff8111d4c57f80] system_call at ffffffff8005d116
    RIP: 0000003889cc72db  RSP: 00007fffaef0d758  RFLAGS: 00010202
    RAX: 0000000000000001  RBX: ffffffff8005d116  RCX: ffffffffffffffe0
    RDX: 000000000000004d  RSI: 00002ac193935000  RDI: 0000000000000005
    RBP: 000000000000004d   R8: 00002ac19394c040   R9: 00000000ffffffff
    R10: 20676e696b636568  R11: 0000000000000206  R12: 00000000186f5fb0
    R13: 00002ac193935000  R14: 000000000000004d  R15: 00000001006a0960
    ORIG_RAX: 0000000000000001  CS: 0033  SS: 002b