syzbot

panic: a thread waited too long to allocate a page
cpuid = 1
time = 93
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0xc6/frame 0xfffffe00577ab230
kdb_backtrace() at kdb_backtrace+0xd0/frame 0xfffffe00577ab390
vpanic() at vpanic+0x257/frame 0xfffffe00577ab550
panic() at panic+0xb5/frame 0xfffffe00577ab620
vm_pageout_oom() at vm_pageout_oom+0xce4/frame 0xfffffe00577ab6b0
vm_fault_allocate() at vm_fault_allocate+0xe41/frame 0xfffffe00577ab830
vm_fault() at vm_fault+0xe20/frame 0xfffffe00577abbc0
vm_fault_trap() at vm_fault_trap+0xbd/frame 0xfffffe00577abc10
trap_pfault() at trap_pfault+0x691/frame 0xfffffe00577abd50
trap() at trap+0x128d/frame 0xfffffe00577abf30
calltrap() at calltrap+0x8/frame 0xfffffe00577abf30
--- trap 0xc, rip = 0x2b4d29, rsp = 0x8266d7f10, rbp = 0x8266d7f80 ---
KDB: enter: panic
[ thread pid 1470 tid 101226 ]
Stopped at      kdb_enter+0x6e: movq    $0,0x25898a7(%rip)
db> 
db> set $lines = 0
db> set $maxwidth = 0
db> serialport: VM disconnected.