On Mon, Jul 30, 2012 at 03:35:39PM +0300, Avi Kivity wrote:
> Having an annoying bug on i386 kvm I decided to debug it buy running an
> i386 guest on my x86_64 host, use 9p to access a guest image, and run it
> using nested kvm.
>
> However, 9p appears to be broken: first, the configure test fails (patch
> sent). Second, while mount works, ls on the mount point causes qemu to
> crash with
>
> (gdb) bt
> #0 error_set (errp=0x7fffe95fb128, fmt=0x5555558d4568 "{ 'class':
> 'VirtFSFeatureBlocksMigration', 'data': { 'path': %s, 'tag': %s } }") at
> /home/tlv/akivity/qemu/error.c:32
> #1 0x000055555567cb06 in v9fs_attach (opaque=0x7fffe95e3020) at
> /home/tlv/akivity/qemu/hw/9pfs/virtio-9p.c:988
> #2 0x000055555561d19f in coroutine_trampoline (i0=1449767888, i1=21845)
> at /home/tlv/akivity/qemu/coroutine-ucontext.c:138
> #3 0x00007ffff5a93ef0 in ?? () from /lib64/libc.so.6
> #4 0x00007fffffffce00 in ?? ()
> #5 0x0000000000000000 in ?? (
>
> **errp already points to a VirtFSFeatureBlocksMigration error;
> v9fs_attach() has been called a second time (the first time,
> understandably, on mount; the second on ls).
Yes, I can reproduce this too.
LIBGUESTFS_QEMU=~/d/qemu/qemu.wrapper \
guestfish -v -- \
sparse /tmp/unused 100M : \
config -device 'virtio-9p-pci,fsdev=root,mount_tag=root' : \
config -fsdev 'local,id=root,path=/tmp,security_model=passthrough' : \
run : \
mount-9p root / : \
ls /
Stack trace:
#0 0x00007fb1d4d19ba5 in __GI_raise (sig=sig@entry=6)
at ../nptl/sysdeps/unix/sysv/linux/raise.c:63
#1 0x00007fb1d4d1b358 in __GI_abort () at abort.c:90
#2 0x00007fb1d4d12972 in __assert_fail_base (fmt=
0x7fb1d4e5c8e8 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n",
assertion=assertion@entry=0x7fb1d8e2e87e "*errp == ((void *)0)",
file=file@entry=0x7fb1d8e56217 "error.c", line=line@entry=35,
function=function@entry=
0x7fb1d8e2e8ca <__PRETTY_FUNCTION__.13983> "error_set") at assert.c:92
#3 0x00007fb1d4d12a22 in __GI___assert_fail (assertion=assertion@entry=
0x7fb1d8e2e87e "*errp == ((void *)0)", file=file@entry=
0x7fb1d8e56217 "error.c", line=line@entry=35, function=function@entry=
0x7fb1d8e2e8ca <__PRETTY_FUNCTION__.13983> "error_set") at assert.c:101
#4 0x00007fb1d8c1147f in error_set (errp=errp@entry=0x7fb1ce36a128,
fmt=fmt@entry=
0x7fb1d8e39a78 "{ 'class': 'VirtFSFeatureBlocksMigration', 'data': { 'path': %s, 'tag': %s } }") at error.c:35
#5 0x00007fb1d8c57f9b in v9fs_attach (opaque=0x7fb1ce352020)
at /home/rjones/d/qemu/hw/9pfs/virtio-9p.c:988
#6 0x00007fb1d8c0fcfa in coroutine_trampoline (i0=<optimized out>,
i1=<optimized out>) at coroutine-ucontext.c:138
#7 0x00007fb1d4d2a2f0 in ?? () from /lib64/libc.so.6
#8 0x00007fff51061aa0 in ?? ()
#9 0xb5b5b5b5b5b5b5b5 in ?? ()
#10 0x0000000000000000 in ?? ()
I'll add a regression test for 9p to libguestfs so at least we will
catch this in future during Fedora builds.
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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