From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jan Kiszka <jan.kiszka@web.de>
Subject: Re: qemu-kvm segfault
Date: Mon, 14 Mar 2011 11:54:25 +0100
Message-ID: <4D7DF3E1.2070208@web.de>
References: <AANLkTimLDcQbuzc_ccxm26cqWe8tiZ4R6LgZZVZdwrF1@mail.gmail.com>
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Cc: kvm@vger.kernel.org, Corentin Chary <corentin.chary@gmail.com>
To: Boris Dolgov <boris@dolgov.name>
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On 2011-03-14 11:33, Boris Dolgov wrote:
> Hello!
>=20
> I am facing an often qemu-kvm segfault when using vnc session.
>=20
> Program terminated with signal 11, Segmentation fault.
> #0  0x00000000004195fb in main_loop_wait (nonblocking=3D<value optimize=
d
> out>) at /usr/src/debug/qemu-kvm-0.13.0/vl.c:1274
> 1274                FD_SET(ioh->fd, &rfds);
> (gdb) bt
> #0  0x00000000004195fb in main_loop_wait (nonblocking=3D<value optimize=
d
> out>) at /usr/src/debug/qemu-kvm-0.13.0/vl.c:1274
> #1  0x000000000042b067 in kvm_main_loop () at
> /usr/src/debug/qemu-kvm-0.13.0/qemu-kvm.c:1710
> #2  0x000000000041a51e in main_loop (argc=3D<value optimized out>,
> argv=3D<value optimized out>, envp=3D<value optimized out>) at
> /usr/src/debug/qemu-kvm-0.13.0/vl.c:1343
> #3  main (argc=3D<value optimized out>, argv=3D<value optimized out>,
> envp=3D<value optimized out>) at
> /usr/src/debug/qemu-kvm-0.13.0/vl.c:3097
> (gdb) p ioh
> $1 =3D (IOHandlerRecord *) 0x2d16b60
> (gdb) p *ioh
> $3 =3D {fd =3D 56568928, fd_read_poll =3D 0, fd_read =3D 0x49c620
> <vnc_client_read>, fd_write =3D 0, deleted =3D 0, opaque =3D 0x3507e70,=
 ufd
> =3D 0x0, next =3D {le_next =3D 0x2d16dc0, le_prev =3D 0x87d8e0}}
> (gdb) p rfds
> $4 =3D {fds_bits =3D {0 <repeats 16 times>}}
> (gdb) p *(ioh->next->le_next)
> $5 =3D {fd =3D 20, fd_read_poll =3D 0, fd_read =3D 0x49c620 <vnc_client=
_read>,
> fd_write =3D 0, deleted =3D 0, opaque =3D 0x365d6d0, ufd =3D 0x0, next =
=3D
> {le_next =3D 0x2d16b10, le_prev =3D 0x2d16b98}}
> (gdb) p *io_handlers.lh_first
> $11 =3D {fd =3D 56568928, fd_read_poll =3D 0, fd_read =3D 0x49c620
> <vnc_client_read>, fd_write =3D 0, deleted =3D 0, opaque =3D 0x3507e70,=
 ufd
> =3D 0x0, next =3D {le_next =3D 0x2d16dc0, le_prev =3D 0x87d8e0}}
>=20
> Looks like fd is getting corrupted somewhere.
>=20
> I am using qemu-kvm from standart Fedora 14 repo:
> [root@serv qemu-kvm-0.13.0]# qemu-kvm --version
> QEMU emulator version 0.13.0 (qemu-kvm-0.13.0), Copyright (c)
> 2003-2008 Fabrice Bellard
>=20
> startup command is:
> qemu-kvm -name freebsd8.1 -m 1500 -smp 4 -cdrom
> /home/iso/FreeBSD-8.1-RELEASE-amd64-disc1.iso -boot d -vga std -drive
> index=3D0,media=3Ddisk,if=3Dide,file=3D/dev/mapper/vg0-freebsd8.1,boot=3D=
on,cache=3Dnone
> -vnc 0.0.0.0:2 -net nic,macaddr=3DFE:E1:DE:AD:00:00,vlan=3D0 -net
> tap,script=3D/root/qemu-ifup-br0,vlan=3D0 -monitor stdio -usb -usbdevic=
e
> tablet -enable-kvm
>=20

Does [1] fix the issue for you?

Jan

[1] http://thread.gmane.org/gmane.comp.emulators.kvm.devel/69071


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