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Re: [Qemu-devel] Funny -m arguments can crash
From: |
Avi Kivity |
Subject: |
Re: [Qemu-devel] Funny -m arguments can crash |
Date: |
Tue, 14 Aug 2012 13:20:34 +0300 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:14.0) Gecko/20120717 Thunderbird/14.0 |
On 08/14/2012 11:44 AM, Markus Armbruster wrote:
>
> Next error:
>
> $ gdb --args qemu-system-x86_64 -nodefaults --enable-kvm -vnc :0 -monitor
> stdio -m 640k
> [...]
> Program received signal SIGSEGV, Segmentation fault.
> [...]
> (gdb) bt
> #0 0x0000003b0de884ac in __memcmp_sse2 () from /lib64/libc.so.6
> #1 0x000000000063f1ad in patch_hypercalls (s=0x139b350)
> at /work/armbru/qemu/hw/i386/../kvmvapic.c:532
> #2 0x000000000063f3fe in vapic_prepare (s=0x139b350)
> at /work/armbru/qemu/hw/i386/../kvmvapic.c:597
> #3 0x000000000063f4ed in vapic_write (opaque=0x139b350, addr=0, data=32,
> size=
> 2) at /work/armbru/qemu/hw/i386/../kvmvapic.c:634
> #4 0x0000000000677a44 in memory_region_write_accessor (opaque=0x139d670,
> addr=
>
> Happens when -m argument is a multiple of 4k in [648k..768k]. Only with
> --enable-kvm. With and without my CMOS fix applied.
kvmvapic requires RAM to be present underneath the ROM. We could fix up
kvmvapic to allocate a 4k region and insert it as an overlay, but it's
sufficient IMO to require sub-1M users to disable it. It won't be of
any use to the anyway as Windows XP requires more than 1MB.
>
> And another one:
>
> $ qemu-system-x86_64 -nodefaults --enable-kvm -vnc :0 -monitor stdio -m
> 900k
> QEMU 1.1.50 monitor - type 'help' for more information
> (qemu) KVM internal error. Suberror: 1
> emulation failure
> EAX=000fdb78 EBX=00000000 ECX=00000000 EDX=000fdb64
> ESI=00000000 EDI=000fdb64 EBP=00000000 ESP=00006f98
> EIP=000e3492 EFL=00000006 [-----P-] CPL=0 II=0 A20=1 SMM=0 HLT=0
> ES =0010 00000000 ffffffff 00c09300 DPL=0 DS [-WA]
> CS =0008 00000000 ffffffff 00c09b00 DPL=0 CS32 [-RA]
> SS =0010 00000000 ffffffff 00c09300 DPL=0 DS [-WA]
> DS =0010 00000000 ffffffff 00c09300 DPL=0 DS [-WA]
> FS =0010 00000000 ffffffff 00c09300 DPL=0 DS [-WA]
> GS =0010 00000000 ffffffff 00c09300 DPL=0 DS [-WA]
> LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
> TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy
> GDT= 000fcd68 00000037
> IDT= 000fdb60 00000000
> CR0=00000011 CR2=00000000 CR3=00000000 CR4=00000000
> DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000
> DR3=0000000000000000
> DR6=00000000ffff0ff0 DR7=0000000000000400
> EFER=0000000000000000
> Code=00 00 b8 26 00 00 00 eb 95 83 c8 ff 83 c4 4c 5b 5e 5f 5d c3 <57> 56
> 53 89 d6 39 c2 72 06 89 c7 f3 a4 eb 1b 8d 51 ff 01 d0 01 d6 89 cf 31 d2 eb 08
> 8a 1c
> q
>
Not sure what's the problem. 57 is a push reg instruction which we
ought to emulate fine.
900k is 0xe1000, just below eip, but we ought to execute just fine from
unshadowed ROM.
> Breakpoint on kvm_handle_internal_error() yields backtrace:
>
> #0 kvm_handle_internal_error (env=0x1389b30, run=0x7ffff7ffa000)
> at /work/armbru/qemu/kvm-all.c:1424
> #1 0x0000000000674c5a in kvm_cpu_exec (env=0x1389b30)
> at /work/armbru/qemu/kvm-all.c:1586
> #2 0x000000000060e0b4 in qemu_kvm_cpu_thread_fn (arg=0x1389b30)
> at /work/armbru/qemu/cpus.c:757
> #3 0x0000003b0ea07d14 in start_thread () from /lib64/libpthread.so.0
> #4 0x0000003b0def197d in clone () from /lib64/libc.so.6
>
> Also seen with 904k, 908k, 964k, 968k, 972k 976k, and a whole lot more.
Same EIP in the dump with those?
> Not reproduced with 1024k+.
>
> An easy way to "fix" these is to require 1MiB of RAM :)
Or disabling kvm.
--
error compiling committee.c: too many arguments to function
- Re: [Qemu-devel] Funny -m arguments can crash, (continued)
- Re: [Qemu-devel] Funny -m arguments can crash, Markus Armbruster, 2012/08/13
- Re: [Qemu-devel] Funny -m arguments can crash, Avi Kivity, 2012/08/13
- Re: [Qemu-devel] Funny -m arguments can crash, Gleb Natapov, 2012/08/13
- Re: [Qemu-devel] Funny -m arguments can crash, Avi Kivity, 2012/08/13
- Re: [Qemu-devel] Funny -m arguments can crash, Gleb Natapov, 2012/08/13
- Re: [Qemu-devel] Funny -m arguments can crash, Blue Swirl, 2012/08/13
- Re: [Qemu-devel] Funny -m arguments can crash, Kevin O'Connor, 2012/08/19
- Re: [Qemu-devel] Funny -m arguments can crash, Anthony Liguori, 2012/08/13
- Re: [Qemu-devel] Funny -m arguments can crash, Markus Armbruster, 2012/08/13
- Re: [Qemu-devel] Funny -m arguments can crash, Markus Armbruster, 2012/08/14
- Re: [Qemu-devel] Funny -m arguments can crash,
Avi Kivity <=
- Re: [Qemu-devel] Funny -m arguments can crash, Jan Kiszka, 2012/08/14
- Re: [Qemu-devel] Funny -m arguments can crash, Avi Kivity, 2012/08/14
- Re: [Qemu-devel] Funny -m arguments can crash, Jan Kiszka, 2012/08/14
- Re: [Qemu-devel] Funny -m arguments can crash, Avi Kivity, 2012/08/14
- Re: [Qemu-devel] Funny -m arguments can crash, Jan Kiszka, 2012/08/14
- Re: [Qemu-devel] Funny -m arguments can crash, Avi Kivity, 2012/08/14
- Re: [Qemu-devel] Funny -m arguments can crash, Markus Armbruster, 2012/08/14
- Re: [Qemu-devel] Funny -m arguments can crash, Avi Kivity, 2012/08/14