REF CONTENT: tok=0 count=0000000000000000 owner=0xfffff8008e11d658
lwkt_reltoken: no tokens to release
panic: lwkt_reltoken: illegal release
cpuid = 1
Trace beginning at frame 0xfffff801166fb538
lwkt_reltoken() at lwkt_reltoken+0xda 0xffffffff80679efa 
lwkt_reltoken() at lwkt_reltoken+0xda 0xffffffff80679efa 
sgopen() at sgopen+0x85 0xffffffff802c80a5 
dev_dopen() at dev_dopen+0x6c 0xffffffff8062cacc 
devfs_spec_open() at devfs_spec_open+0x27d 0xffffffff809237fd 
vop_open() at vop_open+0x7c 0xffffffff80709fbc 
Debugger("panic")

CPU1 stopping CPUs: 0x0000003d
 stopped
Stopped at      Debugger+0x7c:  movb    $0,0xbdaf09(%rip)
db>