Hello,

syzbot found the following crash on:

HEAD commit:    a4989aa8 pci: add support for MMIO config space
git tree:       akaros
console output: https://syzkaller.appspot.com/x/log.txt?x=16a2385a600000
kernel config:  https://syzkaller.appspot.com/x/.config?x=9b018fab5edd31b3
dashboard link: https://syzkaller.appspot.com/bug?extid=3feb100d5398d8b5d728

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+3feb100d5398d8b5d...@syzkaller.appspotmail.com

kernel panic at kern/arch/x86/trap.c:628, from core 0: Damn Damn! Unhandled trap in the kernel!
HW TRAP frame at 0xfffffff000017ea0 on core 0
  rax  0x0000000000000000
  rbx  0x0000000012378086
  rcx  0x0000000000000000
  rdx  0x0000000000000000
  rbp  0xfffffff000017fb8
  rsi  0x0000000000000000
  rdi  0x0000000000000000
  r8   0x00000000ffffffff
  r9   0x0000000000000020
  r10  0xf000e3fef000f841
  r11  0xffffffffc20e3691
  r12  0x0000000000000000
  r13  0x0000000000000000
  r14  0xffff80000d84d420
  r15  0x0000000000000000
  trap 0x0000000d General Protection
kernel panic at kern/arch/x86/trap.c:628, from core 0: Damn Damn! Unhandled trap in the kernel!
        Recursive kernel panic on core 0 (depth 2)


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