[转]File Descriptor泄漏导致Crash: Too many open files，descriptorcrash

[转]File Descriptor泄漏导致Crash: Too many open files，descriptorcrash

在实际的Android开发过程中，我们遇到了一些奇奇怪怪的Crash，通过sigaction再配合libcorkscrew以及一些第三方的Crash Reporter都捕获不到发生Crash的具体信息，十分头疼。然后我们通过Bugly上报的Java的CallStack观察发现这些Crash发现了一些共同的信息：

看来是和OpenGL有关系，于是我们进一步对程序输出的log进行观察，又发现：

从这个log里面我们获得了几个信息：

我们对我们已有的设备反复试验，确实了只有Adreno的设备（小米3，HTC M8，华为P7等）会在特定条件下出现这种奇奇怪怪的随机Crash。而其他设备例如小米Pad（Tegra），三星S3（Mali）等都不会出现这种问题。这个问题确实头疼，在网上搜索了很久也没找到有用的信息。直到在某次小米3上再次测试的时候，发现了log里面还有一条必然出现的信息：

E/MemoryHeapBase(18703): error creating ashmem region: Too many open files

这个信息间接的指出了问题，也给了我们一些提示：似乎打开了过多的文件。于是靠着这个灵光，我们尝试着在程序中输出所有已打开的文件:

 SHOW FILE HANDLES:
 0  (socket:[285038]): read-write
 1  (/dev/null): read-write
 2  (/dev/null): read-write
 3  (/dev/log/main): cloexec write-only
 4  (/dev/log/radio): cloexec write-only
 5  (/dev/log/events): cloexec write-only
 6  (/dev/log/system): cloexec write-only
 7  (/sys/kernel/debug/tracing/trace_marker): write-only
 8  (/dev/__properties__):
 9  (/dev/binder): cloexec read-write
10  (/dev/log/main): cloexec write-only
11  (/dev/log/radio): cloexec write-only
12  (/dev/log/events): cloexec write-only
13  (/dev/log/system): cloexec write-only
14  (/system/framework/framework-res.apk):
15  (/system/framework/core-libart.jar):
16  (pipe:[282578]): nonblock
17  (/dev/alarm):
18  (/dev/cpuctl/tasks): cloexec write-only
19  (/dev/cpuctl/bg_non_interactive/tasks): cloexec write-only
20  (socket:[282569]): read-write
21  (pipe:[282570]):
22  (pipe:[282570]): write-only
23  (pipe:[282578]): nonblock write-only
24  (anon_inode:[eventpoll]): read-write
25  (/data/app/---app_name---/base.apk):
26  (/data/data/---app_name---/databases/bugly_db): cloexec read-write
27  (socket:[285047]): read-write
28  (anon_inode:mali-8938): cloexec
29  (socket:[282605]): nonblock read-write
30  (socket:[283605]): nonblock read-write
31  (/dev/null): read-write
32  (/dev/ump): read-write
33  (socket:[285045]): nonblock read-write
34  (/dev/null): read-write
35  (/dev/mali): read-write
36  (anon_inode:mali-8938): cloexec
37  (anon_inode:mali-8938): cloexec
38  (/data/app/---app_name---/base.apk):
39  (anon_inode:mali-8938): cloexec
40  (anon_inode:mali-8938): cloexec
41  (/dev/null): read-write
42  (/dev/null): read-write
43  (/data/app/---app_name---/base.apk):
44  (/dev/null): read-write
45  (anon_inode:mali-8938): cloexec
46  (/data/data/---app_name---/files/DefaultFont.ttf):
47  (/data/app/---app_name---/base.apk):
48  (anon_inode:sync_fence):
49  (/dev/null): read-write
50  (socket:[285060]): cloexec read-write
52  (anon_inode:mali-8938): cloexec
53  (anon_inode:mali-8938): cloexec
54  (/dev/null): read-write
55  (anon_inode:sync_fence):
56  (pipe:[284134]): write-only
58  (anon_inode:sync_fence):