panic: assertion "(sr->flags & SRF_PUTAWAY) == 0" failed in sysref_put at /usr/src/sys/sys/sysref2.h:85
cpuid = 1
Trace beginning at frame 0xfffff8008d1f09a0
release_dev() at release_dev+0x6e 0xffffffff8062c68e 
release_dev() at release_dev+0x6e 0xffffffff8062c68e 
devfs_destroy_dev_worker() at devfs_destroy_dev_worker+0x18b 0xffffffff8091eb6b 
devfs_destroy_related_worker() at devfs_destroy_related_worker+0x80 0xffffffff8091ed50 
devfs_msg_exec() at devfs_msg_exec+0x6c 0xffffffff8091f93c 
devfs_msg_core() at devfs_msg_core+0xb5 0xffffffff80920935 
Debugger("panic")

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