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port-macppc/55793: NetBSD/macppc fails to boot since switch to gcc9

>Number:         55793
>Category:       port-macppc
>Synopsis:       NetBSD/macppc fails to boot since switch to gcc9
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    port-macppc-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Nov 07 15:25:00 +0000 2020
>Originator:     Andreas Gustafsson
>Release:        NetBSD-current, source date >= 2020.
System: NetBSD
Architecture: powerpc
Machine: macppc

Testing NetBSD-current/macppc under qemu, installation succeeds, but
booting the installed system fails with:

  [   1.0000000] panic: lock error: Mutex: mutex_vector_enter,543: locking against myself: lock 0xbf9740 cpu 0 lwp 0xbf3d40

since this commit:

  2020. mrg src/share/mk/ 1.1224

  switch powerpc, sh3, vax and m68k to GCC 9.  that's everyone.

  thanks espcially to rin@ for testing and fixing issues.




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