syzbot

login: panic: assertwaitok: non-zero mutex count: 1
Starting stack trace...
panic(ffffffff82ff779f) 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(ffffffff835b5d80,1) at pool_get+0x1e9 sys/kern/subr_pool.c:589
uvm_mapent_alloc(fffffd806c1a96d0,0) at uvm_mapent_alloc+0x35a
uvm_map_protect(fffffd806c1a96d0,20000000,20800000,5,0,0,b6329c52e7869d56) at uvm_map_protect+0x888 sys/uvm/uvm_map.c:3138
sys_mprotect(ffff80002a5b56e0,ffff800037621490,ffff8000376213e0) at sys_mprotect+0x34c sys/uvm/uvm_mmap.c:585
syscall(ffff800037621490) at syscall+0x97e sys/arch/amd64/amd64/trap.c:577
Xsyscall() at Xsyscall+0x128
end of kernel
end trace frame: 0x2699cb2b200, count: 247
End of stack trace.