SIGSTOP/SIGCONT problem ? (scheduler or make(1) ?)

I ran a "make -j 48" on my testbox and suspended the task after
a while so I could start systat(1)

===> usr.sbin/sysinstall (obj,build-tools)
===> gnu/usr.bin/cc/cc_tools (obj,depend,all)
*** Stopped -- signal 18
Child (25164) not in table?
warning: structure `reg_info_def' used but not defined
warning: structure `basic_block_def' used but not defined
warning: structure `answer' used but not defined
warning: structure `cpp_macro' used but not defined
warning: structure `reg_info_def' used but not defined
warning: structure `basic_block_def' used but not defined
warning: structure `answer' used but not defined
warning: structure `cpp_macro' used but not defined
couldn't resume gencodes.o: No such process
*** Signal 1
1 error

Doesn't look right to me, but I'm not sure if the scheduler or make(1)
is to blame.

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