20 内存泄露导致崩溃的问题

发布于 2020-06-30 23:32:33 浏览：2206 订阅该版

4g模块AIR720标准驱动+MYMQTT，用的是AT_DEVICE组件直接连的，没有用PPP组件，联网后时间长了就会导致内存溢出，短时间看不出来，尤其把天线拔下来去掉手机卡强制设备重联（重联使用的是网卡的SET DOWN,SET UP接口），运行几天就会出现内存占用越来越多无法释放，看起来应该是系统不断重联，每次重联内存释放不干净所致，谁有这方面经验可以解决。这样的结果最后就崩溃了死机了，崩溃时提示：

```
assertion failed at function:rt_mutex_take
[23:29:40.881]收←◆unction[rt_malloc] shall not be used in ISR
thread   pri  status      sp     stack size max used left tick  error
-------- ---  ------- ---------- ----------  ------  ---------- ---
mqttt0    20  suspend 0x00000168 0x00000a8c    62%   0x00000001 000
。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。
timer      4  suspend 0x000000a8 0x00000200    32%   0x00000009 000
main      10  suspend 0x000000e4 0x000006bc    57%   0x0000000b 000
[31m06-20 23:29:39.527 E/cmb ISR: 
[0m[31m06-20 23:29:39.527 E/cmb ISR: (0) has assert failed at rt_malloc:280.
[0m[31m06-20 23:29:39.527 E/cmb ISR: 
[0m[31m06-20 23:29:39.527 E/cmb ISR: Firmware name: testff, hardware version: v1.01, software version: v1.02
[0m[31m06-20 23:29:39.527 E/cmb ISR: Assert on thread at_clnt
[0m[31m06-20 23:29:39.527 E/cmb ISR: ===== Thread stack information =====
[0m[31m06-20 23:29:39.527 E/cmb ISR:   addr: 20009300    data: 0803f654
[0m[31m06-20 23:29:39.527 E/cmb ISR:   addr: 20009304    data: 0804bdc4
[0m[31m06-20 23:29:39.527 E/cmb ISR:   addr: 20009308    data: 00000118
[0m[31m06-20 23:29:39.527 E/cmb ISR:   addr: 2000930c    data: 08001a8d
[0m[31m06-20 23:29:39.527 E/cmb ISR:   addr: 20009310    data: 0000002d
[0m[31m06-20 23:29:39.527 E/cmb ISR:   addr: 20009314    data: 00000118
[0m[31m06-20 23:29:39.527 E/cmb ISR:   addr: 20009318    data: 0804bdc4
[0m[31m06-20 23:29:39.527 E/cmb ISR:   addr: 2000931c    data: 0803f654
[0m[31m06-20 23:29:39.527 E/cmb ISR:   addr: 20009320    data: 00000009
[0m[31m06-20 23:29:39.527 E/cmb ISR:   addr: 20009324    data: 01008af0
[0m[31m06-20 23:29:39.527 E/cmb ISR:   addr: 20009328    data: 20009330
[0m[31m06-20 23:29:39.527 E/cmb ISR:   addr: 2000932c    data: 20008af0
[0m[31m06-20 23:29:39.527 E/cmb ISR:   addr: 20009330    data: 20009338
[0m[31m06-20 23:29:39.527 E/cmb ISR:   addr: 20009334    data: 080044a1
[0m[31m06-20 23:29:39.527 E/cmb ISR:   addr: 20009338    data: 014b2638
[0m[31m06-20 23:29:39.527 E/cmb ISR:   addr: 2000933c    data: 00000118
[0m[31m06-20 23:29:39.527 E/cmb ISR:   addr: 20009340    data: 0804bdc4
[0m[31m06-20 23:29:39.527 E/cmb ISR:   addr: 20009344    data: 0803f654
[0m[31m06-20 23:29:39.527 E/cmb ISR:   addr: 20009348    data: 0803f62c
```

经过分析，这个崩溃是由at_clnt（AT CLIENT组件）线程导致的，经过仔细分析发现运行一段时候后（至少1天以上，短时时间内看不出来）有内存泄露,如图：

```
[0x20009b60 -    12] at_c
[0x20009b7c -    20] mqtt
[0x20009ba0 -    64] mqtt
[0x20009bf0 -    24]     
[0x20009c18 -   628] at_c
[0x20009e9c -   568] at_c
[0x2000a0e4 -    64] mqtt
[0x2000a134 -    48] mqtt
[0x2000a174 -    64] mqtt
[0x2000a1c4 -    60] at_c
[0x2000a210 -    60] at_c
[0x2000a25c -    28] mqtt
[0x2000a288 -    1K] main
[0x2000a698 -    1K] main
[0x2000aaa8 -    56] main
[0x2000aaf0 -    36] main
[0x2000ab24 -    60] main
[0x2000ab70 -    64] main
[0x2000abc0 -   128] main
[0x2000ac50 -    2K] main
[0x2000b6ec -    36] Make
[0x2000b720 -    44] Make
[0x2000b75c -    36] Timi
[0x2000b790 -    60] at_c
[0x2000b7dc -    92] at_c
[0x2000b848 -    64]     
[0x2000b898 -    32] mqtt
[0x2000b8c8 -    36] mqtt
[0x2000b8fc -    12]     
[0x2000b918 -    36] mqtt
[0x2000b94c -   128]     
[0x2000b9dc -    64] mqtt
[0x2000ba2c -    44]     
[0x2000ba68 -    44] Equi
[0x2000baa4 -    44] Equi
[0x2000bae0 -    44] Equi
[0x2000bb1c -   568] at_c
[0x2000bd64 -   568] at_c
[0x2000bfac -   568] at_c
[0x2000c1f4 -    2K]     
[0x2000ca04 -    64] mqtt
```

里面明显看到at_c（也就是at_clnt）不断增多，而且不释放，就算后面正常联网了也不释放，这里推测，这里正常设备经常掉线重联导致内存泄露越来越多最后崩溃

6 个回答

JYFP_3506 2020-06-30

这家伙很懒，什么也没写！

JYFP_3506 2020-06-30

这家伙很懒，什么也没写！

有时候崩溃提示下面的内容：

```
Function[rt_mutex_take] shall not be used in ISR
thread   pri  status      sp     stack size max used left tick  error
-------- ---  ------- ---------- ----------  ------  ---------- ---
sim0_li   10  suspend 0x000000d8 0x0000052c    80%   0x00000004 000
mqttt0    20  suspend 0x0000016c 0x00000a8c    73%   0x00000002 000
at_clnt    9  suspend 0x00000104 0x00000600    72%   0x00000005 000
.................................................
..............................................
timer      4  suspend 0x000000a8 0x00000200    32%   0x00000009 000
main      10  suspend 0x000000e0 0x000006bc    60%   0x00000001 000
[31m05-19 04:43:09.053 E/cmb ISR: 
[0m[31m05-19 04:43:09.053 E/cmb ISR: (0) has assert failed at rt_mutex_take:662.
[0mtotal memory: 47020
used memory : 38108
maximum allocated memory: 38188
[31m05-19 04:43:09.053 E/cmb ISR: 
[0m[31m05-19 04:43:09.053 E/cmb ISR: Firmware name: testff, hardware version: v1.01, software version: v1.02
[0m[31m05-19 04:43:09.053 E/cmb ISR: Assert on thread Communic
[0m[31m05-19 04:43:09.053 E/cmb ISR: ===== Thread stack information =====
[0m[31m05-19 04:43:09.053 E/cmb ISR:   addr: 20008d88    data: 08040abc
[0m[31m05-19 04:43:09.053 E/cmb ISR:   addr: 20008d8c    data: 0804dccc
[0m[31m05-19 04:43:09.053 E/cmb ISR:   addr: 20008d90    data: 00000296
[0m[31m05-19 04:43:09.053 E/cmb ISR:   addr: 20008d94    data: 08001a8d
[0m[31m05-19 04:43:09.053 E/cmb ISR:   addr: 20008d98    data: 00000031
[0m[31m05-19 04:43:09.053 E/cmb ISR:   addr: 20008d9c    data: 00000296
```