syzbot


WARNING in x86_emulate_instruction
Status: upstream: reported C repro on 2021/05/22 02:52
Reported-by: syzbot+71271244f206d17f6441@syzkaller.appspotmail.com
Fix commit: da6393cdd8aa KVM: X86: Fix warning caused by stale emulation context
Patched on: [ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-qemu2-riscv64 ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-leak ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce ci-upstream-kmsan-gce-386 ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-kcsan-gce ci2-upstream-usb], missing on: [ci-qemu2-arm32]
First crash: 73d, last: 73d

Cause bisection: introduced by (bisect log) :
commit 9a7832ce3d920426a36cdd78eda4b3568d4d09e3
Author: Steve Wahl <steve.wahl@hpe.com>
Date: Fri Jan 8 15:35:49 2021 +0000

  perf/x86/intel/uncore: With > 8 nodes, get pci bus die id from NUMA info

Crash: BUG: spinlock bad magic in synchronize_srcu (log)
Repro: C syz .config

Sample crash report:

Crashes (4):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce 2021/05/18 03:14 upstream 8ac91e6c6033 a343ba6b .config log report syz C WARNING in x86_emulate_instruction
ci-upstream-kasan-gce-selinux-root 2021/05/18 07:09 upstream 8ac91e6c6033 a343ba6b .config log report info WARNING in x86_emulate_instruction
ci-upstream-kasan-gce 2021/05/18 02:46 upstream 8ac91e6c6033 a343ba6b .config log report info WARNING in x86_emulate_instruction
ci-upstream-linux-next-kasan-gce-root 2021/05/18 05:57 linux-next cd557f1c605f a343ba6b .config log report info WARNING in x86_emulate_instruction