Tracing pid 0 tid 100523 td 0xfffff8000c2b4000
kdb_enter() at kdb_enter+0x3b/frame 0xfffffe046cad1670
vpanic() at vpanic+0x1b9/frame 0xfffffe046cad16f0
panic() at panic+0x43/frame 0xfffffe046cad1750
metaslab_trace_add() at metaslab_trace_add+0x10a/frame 0xfffffe046cad17a0
metaslab_alloc() at metaslab_alloc+0xc7a/frame 0xfffffe046cad18b0
zio_dva_allocate() at zio_dva_allocate+0x1e7/frame 0xfffffe046cad1990
zio_execute() at zio_execute+0x17c/frame 0xfffffe046cad19e0
taskqueue_run_locked() at taskqueue_run_locked+0x15d/frame 0xfffffe046cad1a40
taskqueue_thread_loop() at taskqueue_thread_loop+0x88/frame 0xfffffe046cad1a70
fork_exit() at fork_exit+0x84/frame 0xfffffe046cad1ab0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe046cad1ab0