bug#75205: guix package test failure on i686-linux (kexec-load-file test)

bug#75205: guix package test failure on i686-linux (kexec-load-file test)

[Dariqq]

Hello,

The guix package is failing the newly added kexec-load-file syscall test 
on i686-linux:

 From https://ci.guix.gnu.org/build/7774049/details:

test-name: kexec-load-file
location: 
/tmp/guix-build-guix-1.4.0-31.121e96d.drv-0/source/tests/syscalls.scm:688
source:
+ (test-equal
+   "kexec-load-file"
+   EPERM
+   (catch 'system-error
+          (lambda ()
+            (let ((fd1 (open-fdes "/dev/null" O_RDONLY))
+                  (fd2 (open-fdes "/dev/null" O_RDONLY)))
+              (kexec-load-file fd1 fd2 "gnu.repl=yes")))
+          (lambda args (system-error-errno args))))
expected-value: 1
actual-value: 14
result: FAIL

bug#75205: guix package test failure on i686-linux (kexec-load-file test)

[Ian Eure]

This is failing for me on aarch64-linux also:

    test-name: kexec-load-file
    location: 
    /tmp/guix-build-guix-1.4.0-31.121e96d.drv-0/source/tests/syscalls.scm:688
    source:
    + (test-equal
    +   "kexec-load-file"
    +   EPERM
    +   (catch 'system-error
    +          (lambda ()
    +            (let ((fd1 (open-fdes "/dev/null" O_RDONLY))
    +                  (fd2 (open-fdes "/dev/null" O_RDONLY)))
    +              (kexec-load-file fd1 fd2 "gnu.repl=yes")))
    +          (lambda args (system-error-errno args))))
    expected-value: 1
    actual-value: 38
    result: FAIL

If I downgrade to commit 96cd163c14e68c66c6a4cf0b18261fc454f8c1ba, 
guix tests pass again -- the failing test was added in the next 
commit.  I’m not sure what the issue here, it seems like that 
syscall shouldn’t be arch-dependent, and the errnos in the 
failures are unhelpful.  38 is ERANGE, 14 is EFAULT, neither of 
those seem applicable here.  EPERM is 1, and 38 doesn’t have its 
LSB set, so it can’t be a bitmask.

I’m encountering the issue using Guix as a foreign package manager 
on top of Debian 12 "bookworm" in a VM.  Perhaps there’s an 
implicit dependency on the host system’s kernel in the test, which 
Debian’s fails to meet.

Ludo’, any thoughts?

  -- Ian

bug#75205: guix package test failure on i686-linux (kexec-load-file test)

[Ludovic Courtès]

Hello,

Ian Eure <ian@retrospec.tv> skribis:

> This is failing for me on aarch64-linux also:
>
>    test-name: kexec-load-file
>    location:
>    /tmp/guix-build-guix-1.4.0-31.121e96d.drv-0/source/tests/syscalls.scm:688
>    source:
>    + (test-equal
>    +   "kexec-load-file"
>    +   EPERM
>    +   (catch 'system-error
>    +          (lambda ()
>    +            (let ((fd1 (open-fdes "/dev/null" O_RDONLY))
>    +                  (fd2 (open-fdes "/dev/null" O_RDONLY)))
>    +              (kexec-load-file fd1 fd2 "gnu.repl=yes")))
>    +          (lambda args (system-error-errno args))))
>    expected-value: 1
>    actual-value: 38
>    result: FAIL

Could you strace it, to see if strace decodes it are ‘kexec_file_load’?
For example like this:

  ./pre-inst-env strace -e kexec_file_load \
    guile -c '(use-modules (guix build syscalls)) (kexec-load-file (open-fdes "/dev/null" O_RDONLY) (open-fdes "/dev/null" O_RDONLY) "")'

38 is ENOSYS (“Function not implemented”), not ERANGE.  This could mean
that kexec support is missing in this kernel.

Thanks,
Ludo’.