[*] DF-0137 race: 3 forkers + 5 churners for 30s...
[guest panicked ~seconds into the run; ssh session died]
panic: assertion "sym->vs_refs > 0" failed in varsymdrop at /usr/src/sys/kern/kern_varsym.c:492
Trace:
varsymdrop() at varsymdrop+0x4e
varsymdrop() at varsymdrop+0x4e
varsymset_clean() at varsymset_clean+0x57
exit1() at exit1+0x59
sys_exit() at sys_exit+0xe
syscall2() at syscall2+0x11e
Stopped at Debugger+0x7c
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