panic: assertwaitok: non-zero mutex count: 1
Starting stack trace...
panic(ffffffff82ff4316) at panic+0x1ba sys/kern/subr_prf.c:229
assertwaitok() at assertwaitok+0x16f sys/kern/subr_xxx.c:163
mi_switch() at mi_switch+0x2b6 sys/kern/sched_bsd.c:412
yield() at yield+0x61 sys/kern/sched_bsd.c:320
pool_get(ffffffff83576d78,1) at pool_get+0x1e9 sys/kern/subr_pool.c:589
namei(ffff80002e3c15e0) at namei+0xdf sys/kern/vfs_lookup.c:145
ptm_vn_open(ffff80002e3c15e0) at ptm_vn_open+0x40 sys/kern/tty_pty.c:1013
ptmioctl(5100,40287401,ffff80002e3c1a50,3,ffff80002a545218) at ptmioctl+0x3ab sys/kern/tty_pty.c:1116
VOP_IOCTL(fffffd8079abaca8,40287401,ffff80002e3c1a50,3,fffffd807f7d7888,ffff80002a545218) at VOP_IOCTL+0xa3 sys/kern/vfs_vops.c:264
vn_ioctl(fffffd80784ddca8,40287401,ffff80002e3c1a50,ffff80002a545218) at vn_ioctl+0xe8 sys/kern/vfs_vnops.c:525
sys_ioctl(ffff80002a545218,ffff80002e3c1c30,ffff80002e3c1b80) at sys_ioctl+0x678
syscall(ffff80002e3c1c30) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xefe5a0cf520, count: 244
End of stack trace.