https://bugzilla.kernel.org/show_bug.cgi?id=216003 Bug ID: 216003 Summary: Single stepping Windows 7 bootloader results in Assertion `ret < cpu->num_ases && ret >= 0' failed. Product: Virtualization Version: unspecified Kernel Version: 5.17.6-200.fc35.x86_64 Hardware: Intel OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: kvm Assignee: virtualization_kvm@xxxxxxxxxxxxxxxxxxxx Reporter: ercli@xxxxxxxxxxx Regression: No CPU model: Intel(R) Core(TM) i7-4510U CPU @ 2.00GHz Host kernel version: 5.17.6-200.fc35.x86_64 Host kernel arch: x86_64 Guest: Windows 7 or Windows 10 BIOS mode boot loader. 32-bits. This bug still exists if using -machine kernel_irqchip=off This bug no longer exists if using -accel tcg How to reproduce: 1. Install Windows 7 or Windows 10 in QEMU. Use MBR and BIOS (i.e. do not use GPT and UEFI). For example, I installed Windows on a 32G disk, and it results in around 3 partitions: 50M, 31.5G (this is C:), 450M. Only the MBR header (around 1 M) and the 50M disk is needed. For example, https://drive.google.com/uc?id=1mLvKsPSuLbeckwcdnavnQMu8QxOwvX29 can be used to reproduce this bug. Suppose Windows is installed in w.img. 2. Start QEMU qemu-system-x86_64 --drive media=disk,file=w.img,format=raw,index=1 -s -S -enable-kvm 3. Start GDB gdb --ex 'target remote :::1234' --ex 'hb *0x7c00' --ex c --ex 'si 10000' --ex q This GDB command starts from the MBR header and runs 10000 instructions. When I am reproducing it, running 1000 is enough to reproduce this problem. If this problem cannot be reproduced, try to increase this number. 4. See error in QEMU: qemu-system-x86_64: ../hw/core/cpu-sysemu.c:77: cpu_asidx_from_attrs: Assertion `ret < cpu->num_ases && ret >= 0' failed. Aborted (core dumped) Expected behavior: there should not be an assertion error. GDB should be able to single step a lot of instructions successfully. -- You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.
