vn1: MBR magic not found; assume a COMPATIBILITY_SLICE (s0)
hammer2_mount: devstr="/dev/vn1@DATA"
hammer2_mount: device="/dev/vn1" label="DATA" rdonly=0
hammer2_ondisk: "/dev/vn1" zone=0 id=0 offset=0x0000000000000000 size=0x0000000020000000
hammer2_mount: "/dev/vn1": no recovery needed
hammer2_mount: hmp=0xfffff80118640000 pmp=0xfffff80118de0000
HAMMER2: VOLDATA DUMP
HAMMER2: INITIATE SPANs
HAMMER2: CONN WAS TERMINATED
panic with -1 spinlocks held
panic: td_critcount is/would-go negative! 0xfffff80118428f80 -1
cpuid = 0
Trace beginning at frame 0xfffff801192b7660
crit_panic() at crit_panic+0x2f 0xffffffff80672cff 
crit_panic() at crit_panic+0x2f 0xffffffff80672cff 
spin_unlock() at spin_unlock+0x49 0xffffffff8096cda9 
hammer2_base_insert() at hammer2_base_insert+0x652 0xffffffff80972ae2 
hammer2_chain_rename_obref() at hammer2_chain_rename_obref+0x66 0xffffffff80972b76 
hammer2_chain_indirect_maintenance() at hammer2_chain_indirect_maintenance+0x411 0xffffffff80974aa1 
Debugger("panic")

CPU0 stopping CPUs: 0x0000003e
 stopped
Stopped at      Debugger+0x7c:  movb    $0,0xbdaf09(%rip)
db>