Ios平台游戏异常闪退问题之get_numerous_trampoline排查记录

Unity iOS游戏异常:get_numerous_trampoline问题解析与解决
游戏在iOS设备上运行时出现闪退,通过异常上报找到关键堆栈信息,问题指向Mono的get_numerous_trampoline函数。研究Mono源码,发现异常信息与trampolines资源耗尽相关。参考Unity论坛解决方案进行调整,但初次尝试失败,依然闪退。最终在Xcode中对工程进行特定设置,成功解决了因get_numerous_trampoline引发的崩溃问题。

案件回放:

        打开游戏,进行上线前的检查,在检测功能的时候,莫名其妙的就崩溃,闪退了。。。。。。立即重新拉起游戏,准备简单的重现之后找研发来修复,发现不能必现了。这个时候去提单也太Low了~~~找到研发问了下,本身的应用是否有做crash异常上报。(目前这一块的Open Source框架比较多,我就不在此累赘复述了)直接查看上一次的crash异常上报信息,结合symbol 信息还原堆栈信息。


案件侦测:

    查看还原后的堆栈信息,有一处信息为:



发现最终导致该起“凶案”的罪犯应该是跟Mono本身有关系。而且从_g_log的调用来看,能够给予我们提供线索的应该是get_numerous_trampoline这个函数。

查看Mono源码对应的该函数原型



以上的红色标记信息显示:

get_numerous_trampoline函数中对于异常,错误信息的处理error信息为:Ran out of trampoline

### Linux Kernel `struct sk_buff` Usage and Explanation In the context of network programming within the Linux kernel, `struct sk_buff`, often abbreviated as skbuff or simply skb, plays a crucial role in handling packets at various layers of networking stack. This structure encapsulates all necessary information about each packet that traverses through different stages such as receiving, processing, queuing, and transmitting. The definition of `struct sk_buff` includes numerous fields designed to manage data efficiently while providing flexibility for diverse operations on packets: - **Data Buffer Management**: Contains pointers like `_data`, which points directly into an allocated memory area where actual payload resides. - **Control Information Storage**: Fields store metadata related to protocol headers (e.g., IP header), socket options, timestamps, etc.[^1] An example snippet demonstrating allocation and basic manipulation with `sk_buff` might look similar to below code block written in C language used extensively inside drivers and other parts of the kernel dealing closely with raw sockets or custom protocols implementation. ```c #include <linux/skbuff.h> // Allocate new buffer struct sk_buff *skb = alloc_skb(size, GFP_KERNEL); if (!skb) { printk(KERN_ERR "Failed to allocate SKB\n"); } // Set up some initial values... skb_reset_network_header(skb); skb->protocol = htons(ETH_P_IP); // Example setting Ethernet type field value // After done using it don't forget cleanup properly by freeing resources associated kfree_skb(skb); ``` For modifying system-wide settings affecting how queues operate including default queue discipline (`qdisc`) one can use command line interface provided by procfs filesystem entries allowing direct interaction without requiring recompilation or rebooting machine after changes take effect immediately upon writing desired configuration string followed by newline character via simple shell commands shown hereunder. ```bash echo "pfifo_fast" > /proc/sys/net/core/default_qdisc cat /proc/sys/net/core/default_qdisc ``` This demonstrates changing back to FIFO-based scheduling policy named 'pfifo_fast' commonly employed when no special requirements exist regarding traffic shaping or prioritization rules need enforcement over interfaces managed under control of specified qdisc instance attached thereto[^2]. --related questions-- 1. How does `alloc_skb()` function determine appropriate size during creation? 2. What are common scenarios leading to failure allocating buffers represented by `NULL` pointer returned from allocator functions? 3. Can you explain more about manipulating individual members contained within `struct sk_buff` structures specifically those pertaining to transport layer properties? 4. Are there any performance implications associated with frequent allocations/deallocations involving these types of objects throughout runtime operation especially concerning high-throughput applications?
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