panic: assertwaitok: non-zero mutex count: 2
Starting stack trace...
panic(ffffffff82ff3bf1) 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
malloc(10,7f,1) at malloc+0xe5 sys/kern/kern_malloc.c:170
spec_open_clone(ffff80002a587018) at spec_open_clone+0x340
spec_open(ffff80002a587018) at spec_open+0x326 sys/kern/spec_vnops.c:148
VOP_OPEN(fffffd806e9d2b28,1,fffffd807f7d7548,ffff80002a4d36e8) at VOP_OPEN+0x82 sys/kern/vfs_vops.c:138
vn_open(ffff80002a587268,1,0) at vn_open+0x708 sys/kern/vfs_vnops.c:177
doopenat(ffff80002a4d36e8,ffffff9c,20000000,0,0,ffff80002a587410) at doopenat+0x31d sys/kern/vfs_syscalls.c:1123
syscall(ffff80002a5874c0) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0xa2987570510, count: 245
End of stack trace.