panic: Can't clear local locks with F_UNLCKSYS cpuid = 0 time = 1553515737 KDB: stack backtrace: db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe001faf2520 vpanic() at vpanic+0x1e0/frame 0xfffffe001faf2580 panic() at panic+0x43/frame 0xfffffe001faf25e0 lf_advlockasync() at lf_advlockasync+0x14dd/frame 0xfffffe001faf26a0 lf_advlock() at lf_advlock+0x5e/frame 0xfffffe001faf2710 vop_stdadvlock() at vop_stdadvlock+0xf2/frame 0xfffffe001faf2810 VOP_ADVLOCK_APV() at VOP_ADVLOCK_APV+0xc5/frame 0xfffffe001faf2840 kern_fcntl() at kern_fcntl+0xfd1/frame 0xfffffe001faf28f0 kern_fcntl_freebsd() at kern_fcntl_freebsd+0x14f/frame 0xfffffe001faf2980 amd64_syscall() at amd64_syscall+0x436/frame 0xfffffe001faf2ab0 fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe001faf2ab0 --- syscall (198, FreeBSD ELF64, nosys), rip = 0x412e7a, rsp = 0x7fffdfffdf38, rbp = 0x3 --- KDB: enter: panic [ thread pid 1005 tid 100648 ] Stopped at kdb_enter+0x6a: movq $0,kdb_why