bisecting fixing commit since bfb9e5c03076a446b1f4f6a523ddc8d723c907a6
building syzkaller on 36650b4b2c942bc382314dce384d311fbadd1208
testing commit bfb9e5c03076a446b1f4f6a523ddc8d723c907a6 with gcc (GCC) 8.1.0
kernel signature: 1f9e8df04bcb3936f5e28401544c00ff9fc72462fbbd22e785f2ea08a1ca68d3
all runs: crashed: BUG: unable to handle kernel NULL pointer dereference in mem16_serial_out
testing current HEAD 56dfe6252c6823c486ce4b1a922d72abc7e3c6b1
testing commit 56dfe6252c6823c486ce4b1a922d72abc7e3c6b1 with gcc (GCC) 8.1.0
kernel signature: 6a067da630db2e10925a5e7b4369eeef5535b103b8fb7d0602505b801c63e3a2
all runs: boot failed: WARNING in kvm_mmu_set_mmio_spte_mask
revisions tested: 2, total time: 32m15.393853701s (build: 17m45.123153848s, test: 13m40.299396446s)
bisection is inconclusive, the first good commit could be any of:
bfb9e5c03076a446b1f4f6a523ddc8d723c907a6
56dfe6252c6823c486ce4b1a922d72abc7e3c6b1