rabbitmq crashdump分析

erlang宕机，一般来说都是因为内存分配失败。此时可以通过erl_crashdump_analyzer.sh分析dmp文件，如下：

https://github.com/ferd/recon/blob/master/script/erl_crashdump_analyzer.sh

[root@localhost239 rabbitmq]# ./erl_crashdump_analyzer.sh erl_crash.dump 
analyzing erl_crash.dump, generated on:  Wed Nov 4 11:32:56 2020 

Slogan: eheap_alloc: Cannot allocate 1318267840 bytes of memory (of type "old_heap").

Memory:
===
  processes: 985 Mb
  processes_used: 985 Mb
  system: 507 Mb
  atom: 1 Mb
  atom_used: 1 Mb
  binary: 451 Mb
  code: 22 Mb
  ets: 13 Mb
  ---
  total: 1493 Mb

Different message queue lengths (5 largest different):
===
   3799 0

Error logger queue length:
===
0

File descriptors open:
===
  UDP:  0
  TCP:  87
  Files:  1
  ---
  Total:  88

Number of processes:
===
3799

Processes Heap+Stack memory sizes (words) used in the VM (5 largest different):
===
      1 114432973
      1 121536
      1 75113
      1 46422
      2 28690

Processes OldHeap memory sizes (words) used in the VM (5 largest different):
===
      1 833026
      1 514838
      1 318187
      2 196650
      2 121536

Process States when crashing (sum): 
===
      1 CONNECTED
      3 CONNECTED|BINARY_IO
      4 CONNECTED|BINARY_IO|PORT_LOCK
      1 CONNECTED|BINARY_IO|SOFT_EOF|PORT_LOCK
     83 CONNECTED|PORT_LOCK
      1 Current Process Garbing
      1 Current Process Internal ACT_PRIO_NORMAL | USR_PRIO_NORMAL | PRQ_PRIO_NORMAL | ACTIVE | GC | DIRTY_ACTIVE_SYS | DIRTY_RUNNING_SYS
      1 Current Process Internal ACT_PRIO_NORMAL | USR_PRIO_NORMAL | PRQ_PRIO_NORMAL | ACTIVE | RUNNING
      1 Current Process Running
      1 Garbing
      1 Internal ACT_PRIO_HIGH | USR_PRIO_HIGH | PRQ_PRIO_HIGH | OFF_HEAP_MSGQ
      4 Internal ACT_PRIO_MAX | USR_PRIO_MAX | PRQ_PRIO_MAX
      1 Internal ACT_PRIO_MAX | USR_PRIO_MAX | PRQ_PRIO_MAX | OFF_HEAP_MSGQ
   3785 Internal ACT_PRIO_NORMAL | USR_PRIO_NORMAL | PRQ_PRIO_NORMAL
      1 Internal ACT_PRIO_NORMAL | USR_PRIO_NORMAL | PRQ_PRIO_NORMAL | ACTIVE | GC | DIRTY_ACTIVE_SYS | DIRTY_RUNNING_SYS
      7 Internal ACT_PRIO_NORMAL | USR_PRIO_NORMAL | PRQ_PRIO_NORMAL | OFF_HEAP_MSGQ
   3798 Waiting