bisecting fixing commit since b0cdffaa546e24acf92ab3b0d4e917a51aff6a82
building syzkaller on 4de4e9f01d7139b72102ae0b8a1e810730467774
testing commit b0cdffaa546e24acf92ab3b0d4e917a51aff6a82 with gcc (GCC) 8.1.0
kernel signature: f822085107dd569279e1b19713d69d1cc11e706b137ab5ba0ba11f7fa6a23d22
all runs: crashed: KASAN: null-ptr-deref Read in insert_char
testing current HEAD 4139fb08c05fec734f85a99e8b7d99dc12b1b68c
testing commit 4139fb08c05fec734f85a99e8b7d99dc12b1b68c with gcc (GCC) 8.1.0
kernel signature: f28c03a163e339e5088404de3387559f72e0dc9520567c68e9f53bc02bbb756f
all runs: boot failed: WARNING in kvm_mmu_set_mmio_spte_mask
revisions tested: 2, total time: 31m53.030834537s (build: 16m31.98332736s, test: 13m48.947834989s)
bisection is inconclusive, the first good commit could be any of:
b0cdffaa546e24acf92ab3b0d4e917a51aff6a82
4139fb08c05fec734f85a99e8b7d99dc12b1b68c