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Another COMPAT_* question

I've got this one image which is available only as a binary, and it is a statically linked NetBSD-4.0 image

        dnetc.x86_64: ELF 64-bit LSB executable, x86-64, version 1 (SYSV),
        statically linked, for NetBSD 4.0, stripped

If I run this on a 6.99.17 kernel built from today's sources, and that kernel includes COMPAT_40, COMPAT_50, and COMPAT_60, the image starts up correctly.

However, if I boot a kernel which is identical except for those three COMPAT_* options, and then I modload the compat module, the same image fails. Using ktrace, it would seem that there is some sysctl variable missing from the compat module.

  1043      1 dnetc.x86_64 CALL  compat_50_gettimeofday(0x7f7fffffd670,0)
  1043      1 dnetc.x86_64 RET   compat_50_gettimeofday 0
  1043      1 dnetc.x86_64 CALL  
  1043      1 dnetc.x86_64 RET   __sysctl -1 errno 2 No such file or directory
  1043      1 dnetc.x86_64 CALL  write(2,0x7f7fffffcd10,0x24)
  1043      1 dnetc.x86_64 GIO   fd 2 wrote 36 bytes
       "dnetc: Unable to initialize timers.\n"
  1043      1 dnetc.x86_64 RET   write 36/0x24
  1043      1 dnetc.x86_64 CALL  exit(0xffffffff)

Is there any reasonable way to figure out which sysctl variable is missing?

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