DragonFlyBSD

Though there already are some bugs open with a similar message, this one seems to be different:

Unread portion of the kernel message buffer:
panic: Bad link elm 0xffffffe0a3775670 next->prev != elm
cpuid = 1
Trace beginning at frame 0xffffffe0b7349948
panic() at panic+0x1fb 0xffffffff802fa588
panic() at panic+0x1fb 0xffffffff802fa588
proc_remove_zombie() at proc_remove_zombie+0x57 0xffffffff802f1f0e
kern_wait() at kern_wait+0x28e 0xffffffff802e5d25
sys_wait4() at sys_wait4+0x44 0xffffffff802e5ff4
syscall2() at syscall2+0x370 0xffffffff80547f61

This happens on DragonFly v3.1.0.586.g6c7e9-DEVELOPMENT x86_64.

A dump is available.