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解决Driver/library version mismatch

 https://comzyh.com/blog/archives/967/

服务器更新nvidia driver 版本之后，经常会出现

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Failed to initialize NVML: Driver/library version mismatch.<br>

这个问题出现的原因是kernel mod 的 Nvidia driver 的版本没有更新，一般情况下，重启机器就能够解决，如果因为某些原因不能够重启的话，也有办法reload kernel mod。

简单来看，就两步

  1. unload nvidia kernel mod
  2. reload nvidia kernel mod

执行起来就是

  1. sudo rmmod nvidia
  2. sudo nvidia-smi

nvidia-smi 发现没有 kernel mod 会将其自动装载。

但是事情远远不是这么简单，一般情况下都会遇到卸载失败。

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$ sudo rmmod nvidia
rmmod: ERROR: Module nvidia is in use by: nvidia_modeset nvidia_uvm

这时，就要一点一点的卸载整个驱动了，首先要知道现在kernel mod 的依赖情况，首先我们从错误信息中知道，nvidia_modeset nvidia_uvm 这两个 mod 依赖于 nvidia, 所以要先卸载他们

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$lsmod | grep nvidia
nvidia_uvm            647168  0
nvidia_drm             53248  0
nvidia_modeset        790528  1 nvidia_drm
nvidia              12144640  152 nvidia_modeset,nvidia_uvm            12144640  152 nvidia_modeset,nvidia_uvm

可以看到 nvidia 被使用了152词，我们可以先卸载 nvidia_uvm 和 nvidia_modeset

先查看下有哪些进程使用了 nvidia*

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sudo lsof -n -w  /dev/nvidia*

这些进程有个了解，如果一会卸载失败，记得关闭相关进程。

卸载

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sudo rmmod nvidia_uvm
sudo rmmod nvidia_modeset

再 lsof 一遍，如果 nvidia 的使用 Used by 还没有降到 0，kill 相关进程

最后

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sudo rmmod nvidia
nvidia-smi

收工

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