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Diffstat (limited to 'results/classifier/118/all/1047')
| -rw-r--r-- | results/classifier/118/all/1047 | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/results/classifier/118/all/1047 b/results/classifier/118/all/1047 new file mode 100644 index 000000000..1237eb0eb --- /dev/null +++ b/results/classifier/118/all/1047 @@ -0,0 +1,134 @@ +peripherals: 0.937 +register: 0.935 +graphic: 0.925 +device: 0.924 +assembly: 0.912 +performance: 0.912 +ppc: 0.911 +mistranslation: 0.908 +semantic: 0.907 +permissions: 0.903 +hypervisor: 0.901 +debug: 0.901 +architecture: 0.899 +vnc: 0.889 +socket: 0.885 +risc-v: 0.884 +arm: 0.879 +i386: 0.874 +TCG: 0.865 +boot: 0.856 +KVM: 0.847 +PID: 0.843 +VMM: 0.841 +virtual: 0.839 +user-level: 0.835 +kernel: 0.834 +network: 0.832 +x86: 0.811 +files: 0.772 + +Single stepping Windows 10 bootloader results in Assertion `ret < cpu->num_ases && ret >= 0' failed. +Description of problem: +When I am trying to debug Windows bootloader, I see an assertion error in QEMU when single stepping some instructions in SeaBIOS. + +``` +qemu-system-i386: ../hw/core/cpu-sysemu.c:77: cpu_asidx_from_attrs: Assertion `ret < cpu->num_ases && ret >= 0' failed. +``` +Steps to reproduce: +1. Download / construct `w.img`, see above +2. Start QEMU using `./qemu-system-i386 --drive media=disk,file=w.img,format=raw,index=1 -s -S -enable-kvm` +3. Start GDB using `gdb --ex 'target remote :::1234' --ex 'hb *0x7c00' --ex c --ex 'si 1000' --ex q` +4. See error message +Additional information: +The GDB script first breaks at 0x7c00, then tries to execute 1000 instructions using single step (`si`). On my machine, after executing around 772 instructions, the assertion error in QEMU happens. +Here is an interactive GDB session on my machine. + +``` +(gdb) hb *0x7c00 +Hardware assisted breakpoint 1 at 0x7c00 +(gdb) c +Continuing. + +Breakpoint 1, 0x00007c00 in ?? () +(gdb) d +Delete all breakpoints? (y or n) y +(gdb) si 770 +0x000f7d7b in ?? () +(gdb) x/10i $eip +=> 0xf7d7b: mov $0x7d85,%ebx + 0xf7d80: out %al,$0xb2 + 0xf7d82: pause + 0xf7d84: hlt + 0xf7d85: mov %bp,%sp + 0xf7d88: jmp 0xf7dd1 + 0xf7d8a: mov %cx,%si + 0xf7d8d: mov $0x1,%ax + 0xf7d91: add %al,(%eax) + 0xf7d93: callw 0x6b66 +(gdb) si +0x000f7d80 in ?? () +(gdb) info reg +eax 0xb5 181 +ecx 0x5678 22136 +edx 0x0 0 +ebx 0x7d85 32133 +esp 0xe96d4 0xe96d4 +ebp 0xfed4 0xfed4 +esi 0xe0346 918342 +edi 0xefd91 982417 +eip 0xf7d80 0xf7d80 +eflags 0x6 [ IOPL=0 PF ] +cs 0x8 8 +ss 0x10 16 +ds 0x10 16 +es 0x10 16 +fs 0x10 16 +gs 0x10 16 +fs_base 0x0 0 +gs_base 0x0 0 +k_gs_base 0x0 0 +cr0 0x11 [ ET PE ] +cr2 0x0 0 +cr3 0x0 [ PDBR=0 PCID=0 ] +cr4 0x0 [ ] +cr8 0x0 0 +efer 0x0 [ ] +... +mxcsr 0x1f80 [ IM DM ZM OM UM PM ] +(gdb) si +0x000f7d82 in ?? () +(gdb) info reg +eax 0xb5 181 +ecx 0x5678 22136 +edx 0x0 0 +ebx 0x7d85 32133 +esp 0xe96d4 0xe96d4 +ebp 0xfed4 0xfed4 +esi 0xe0346 918342 +edi 0xefd91 982417 +eip 0xf7d82 0xf7d82 +eflags 0x6 [ IOPL=0 PF ] +cs 0x8 8 +ss 0x10 16 +ds 0x10 16 +es 0x10 16 +fs 0x10 16 +gs 0x10 16 +fs_base 0x0 0 +gs_base 0x0 0 +k_gs_base 0x0 0 +cr0 0x11 [ ET PE ] +cr2 0x0 0 +cr3 0x0 [ PDBR=0 PCID=0 ] +cr4 0x0 [ ] +cr8 0x0 0 +efer 0x0 [ ] +... +mxcsr 0x1f80 [ IM DM ZM OM UM PM ] +(gdb) si +Remote connection closed +(gdb) +``` + +This bug was first incorrectly filed in KVM's bug tracker at <https://bugzilla.kernel.org/show_bug.cgi?id=216003>. |