[Qemu-devel] [Bug 501177] Re: qemu i386-softmmu segfaults on i386 while testing kdbg hardware interrupts

[Sven Eckelmann]

My fault. it is still their... did my test wrong

** Changed in: qemu
       Status: Fix Released => New

-- 
qemu i386-softmmu segfaults on i386 while testing kdbg hardware interrupts
https://bugs.launchpad.net/bugs/501177
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Status in QEMU: New

Bug description:
I tried to boot a kernel with enabled kgdb and kgdb self checks with qemu 
emulating i386. It works with amd64, but crashes with i386. Tests were done 
with 19e65b47f60c68d7e8c96aa0a36223c5a0d3422b and qemu 0.11.1-1 on Debian sid.

Backtrace of i386-softmmu/qemu (19e65b47f60c68d7e8c96aa0a36223c5a0d3422b)

[   15.398435] kgdbts:RUN singlestep [900/1000]
[   15.683097] kgdbts:RUN hw breakpoint test

Program received signal SIGSEGV, Segmentation fault.
raise_interrupt (intno=1, is_int=0, error_code=0, next_eip_addend=0) at 
/home/sven/tmp/qemu/target-i386/op_helper.c:1335
1335        env->exception_index = intno;
(gdb) bt
#0  raise_interrupt (intno=1, is_int=0, error_code=0, next_eip_addend=0) at 
/home/sven/tmp/qemu/target-i386/op_helper.c:1335
#1  0x08182347 in raise_exception (exception_index=1) at 
/home/sven/tmp/qemu/target-i386/op_helper.c:1351
#2  0x08191e9a in breakpoint_handler (env=0x8467fa8) at 
/home/sven/tmp/qemu/target-i386/helper.c:1530
#3  0x08125e84 in cpu_handle_debug_exception (env1=0x8467fa8) at 
/home/sven/tmp/qemu/cpu-exec.c:209
#4  cpu_x86_exec (env1=0x8467fa8) at /home/sven/tmp/qemu/cpu-exec.c:274
#5  0x08052680 in qemu_cpu_exec (argc=0, argv=0x0, envp=0x6461) at 
/home/sven/tmp/qemu/vl.c:4021
#6  tcg_cpu_exec (argc=0, argv=0x0, envp=0x6461) at 
/home/sven/tmp/qemu/vl.c:4052
#7  main_loop (argc=0, argv=0x0, envp=0x6461) at /home/sven/tmp/qemu/vl.c:4167
#8  main (argc=0, argv=0x0, envp=0x6461) at /home/sven/tmp/qemu/vl.c:6124


It was run with `/home/sven/tmp/qemu/i386-softmmu/qemu -m 1024 -kernel 
linux-2.6.32.qemu -drive file=root.cow3,if=virtio -net 
nic,macaddr=02:ca:ff:ee:ba:43,model=virtio,vlan=3 -net 
tap,ifname=tap3,vlan=3,script=no -nographic`