syzbot

Fatal trap 12: page fault while in kernel mode
cpuid = 1; apic id = 01
fault virtual address	= 0x378
fault code		= supervisor read data, page not present
instruction pointer	= 0x20:0xffffffff81396a4c
stack pointer	        = 0x28:0xfffffe005169f9a0
frame pointer	        = 0x28:0xfffffe005169f9f0
code segment		= base 0x0, limit 0xfffff, type 0x1b
			= DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags	= interrupt enabled, resume, IOPL = 0
current process		= 12 (irq31: virtio_pci1)
trap number		= 12
panic: page fault
cpuid = 1
time = 1619012086
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x47/frame 0xfffffe005169f600
vpanic() at vpanic+0x1c7/frame 0xfffffe005169f660
panic() at panic+0x43/frame 0xfffffe005169f6c0
trap_fatal() at trap_fatal+0x4cd/frame 0xfffffe005169f740
trap_pfault() at trap_pfault+0xd4/frame 0xfffffe005169f7b0
trap() at trap+0x41d/frame 0xfffffe005169f8d0
calltrap() at calltrap+0x8/frame 0xfffffe005169f8d0
--- trap 0xc, rip = 0xffffffff81396a4c, rsp = 0xfffffe005169f9a0, rbp = 0xfffffe005169f9f0 ---
tcp_lro_flush_all() at tcp_lro_flush_all+0x1c/frame 0xfffffe005169f9f0
vtnet_rxq_eof() at vtnet_rxq_eof+0x1022/frame 0xfffffe005169fad0
vtnet_rx_vq_process() at vtnet_rx_vq_process+0xe1/frame 0xfffffe005169fb10
ithread_loop() at ithread_loop+0x33f/frame 0xfffffe005169fbb0
fork_exit() at fork_exit+0xb3/frame 0xfffffe005169fbf0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe005169fbf0
--- trap 0, rip = 0, rsp = 0, rbp = 0 ---
KDB: enter: panic
[ thread pid 12 tid 100052 ]
Stopped at      kdb_enter+0x67: movq    $0,0x163b9fe(%rip)
db>