Error when building the 5.10.17 Kernel on the newest version of Ubuntu.

Nucl3arsn3k · 11-27-2023, 11:34 PM

When I run the make command in the directory for the 5.10.17 kernel, after about 30 seconds I get the error included below. I'm unsure why this is happening, as I've successfully built this kernel version before on a different distro. I am doing this on the newest version of Ubuntu,for context on the distro.

Code:

subcmd-util.h: In function ‘xrealloc’:
subcmd-util.h:58:31: error: pointer ‘ptr’ may be used after ‘realloc’ [-Werror=use-after-free]
   58 |                         ret = realloc(ptr, 1);
      |                               ^~~~~~~~~~~~~~~
subcmd-util.h:52:21: note: call to ‘realloc’ here
   52 |         void *ret = realloc(ptr, size);
      |                     ^~~~~~~~~~~~~~~~~~
subcmd-util.h:56:23: error: pointer ‘ptr’ may be used after ‘realloc’ [-Werror=use-after-free]
   56 |                 ret = realloc(ptr, size);
      |                       ^~~~~~~~~~~~~~~~~~
subcmd-util.h:52:21: note: call to ‘realloc’ here
   52 |         void *ret = realloc(ptr, size);
      |                     ^~~~

business_kid · 12-01-2023, 05:01 AM

Hello, Nucl3arsn3k & welcome to LQ

You're unsure what is happening - so am I. You're pointing out header issues, but they don't appear to be fatal, as=n sending a snippet like you did doesn't allow a diagnosis. A compile can have an awful lot of those warnings and still work.

Let the compile run until it errors out. You should see the word error. Whart we want to see is the first error, and down to the end. Pastebin it if it's too long. And with Ubuntu, they do precompiled kernels. So you can just upgrade the package. Why not do that?

zeebra · 12-01-2023, 06:39 AM

Quote:

Originally Posted by business_kid

Hello, Nucl3arsn3k & welcome to LQ

You're unsure what is happening - so am I. You're pointing out header issues, but they don't appear to be fatal, as=n sending a snippet like you did doesn't allow a diagnosis. A compile can have an awful lot of those warnings and still work.

Let the compile run until it errors out. You should see the word error. Whart we want to see is the first error, and down to the end. Pastebin it if it's too long. And with Ubuntu, they do precompiled kernels. So you can just upgrade the package. Why not do that?

Seems like that to me too, seems more like a warning than a fatal error. Besides, the OP never posted an end sequence happening in the context.

Nucl3arsn3k · 12-02-2023, 09:39 AM

The kernel compiled and installed just fine despite this error. Thanks for the help.

business_kid · 12-02-2023, 10:47 AM

Gladf it worked. Make sure your headers match your kernel, as appears to be the practise these days. In particular, there's differences between kernel-4.x.x kernels & 5.x.x ones.