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Safa Rekik

2014-May-15 11:13 UTC

Re: [Libguestfs] guestfsd crashes when the handle is closed

Hello,

So in ubuntu1204 guest This is what i got :

    *(gdb)* bt full
   * #0*  0x005a9fc0 in exit () from /lib/i386-linux-gnu/libc.so.6
    No symbol table info available.
  *  #1*  0x0805f7dd in ?? ()
    No symbol table info available.
   * #2*  0x0804aedf in ?? ()
    No symbol table info available.
    *#3*  0x005904d3 in __libc_start_main () from
/lib/i386-linux-gnu/libc.so.6
   No symbol table info available.
   *#4*  0x0804b025 in ?? ()
   No symbol table info available.

i also tried to print information about each frame, i found unknown
addresses in frame 4 and 3, here are the details :
=======================================--frame 4 :
*            (gdb) info frame*
           Stack level 4, frame at 0x0:
          eip = 0x804b025; saved eip 0x804b025
          Outermost frame: outermost
         caller of frame at 0xbfd55210
        Arglist at* unknown address.*
         Locals at* unknown address*, Previous frame's sp in esp
*--*frame 3:
*             (gdb) info frame *
             Stack level 3, frame at 0xbfd55210:
              eip = 0x5904d3 in __libc_start_main; saved eip 0x804b025
             called by frame at 0x0, caller of frame at 0xbfd551a0
            Arglist at *unknown address*.
             Locals at *unknown address*, Previous frame's sp is
0xbfd55210
             Saved registers:
           ebx at 0xbfd551fc, ebp at 0xbfd55208, esi at 0xbfd55200, edi at
           0xbfd55204,
           eip at 0xbfd5520c
========================================
For fedora 20 guest, this is the back trace output :
====================================*(gdb) bt full*
#0  0xb73e2040 in exit () from /lib/libc.so.6
No symbol table info available.
#1  0xb77263a8 in main_loop ()
No symbol table info available.
#2  0xb76fe190 in main ()
No symbol table info available.

*(gdb) frame 0*
#0  0xb73e2040 in exit () from /lib/libc.so.6
(gdb) info frame
Stack level 0, frame at 0xbfb022a0:
 eip = 0xb73e2040 in exit; saved eip 0xb77263a8
 called by frame at 0xbfb02350
 Arglist at 0xbfb02298, args:
 Locals at 0xbfb02298, Previous frame's sp is 0xbfb022a0
 Saved registers:
  eip at 0xbfb0229c

*(gdb) frame 1*
#1  0xb77263a8 in main_loop ()
(gdb) info frame
Stack level 1, frame at 0xbfb02350:
 eip = 0xb77263a8 in main_loop; saved eip 0xb76fe190
 called by frame at 0xbfb025f0, caller of frame at 0xbfb022a0
 Arglist at 0xbfb022ac, args:
 Locals at 0xbfb022ac, Previous frame's sp is 0xbfb02350
 Saved registers:
  ebx at 0xbfb0233c, ebp at 0xbfb02348, esi at 0xbfb02340, edi at
0xbfb02344,
  eip at 0xbfb0234c

*(gdb) frame 2*
#2  0xb76fe190 in main ()
(gdb) info frame
Stack level 2, frame at 0xbfb025f0:
 eip = 0xb76fe190 in main; saved eip 0xb73c9b83
 caller of frame at 0xbfb02350
 Arglist at 0xbfb025e8, args:
 Locals at 0xbfb025e8, Previous frame's sp is 0xbfb025f0
 Saved registers:
  ebx at 0xbfb025dc, ebp at 0xbfb025e8, esi at 0xbfb025e0, edi at
0xbfb025e4,
  eip at 0xbfb025ec
============================================
As for parallel connections,  we are looking forward for 1.28 :-).
Meanwhile we are trying to test things with a single handle.

Thanks !


2014-05-15 0:16 GMT+02:00 Richard W.M. Jones <rjones@redhat.com>:
> On Wed, May 14, 2014 at 06:07:37PM +0200, Safa Rekik wrote:
> > Hello,
> >
> > I launched guestfsd in my guest with this command : guestfsd* -rv*.
> > When i close the handle the deamon crashes.
> >
> > This is the output i got (Deamon side) :
> >                              guestfsd: main_loop : new request, len
0x28
> >                              fsync /dev/sda
> >                              /dev/sr0 : No medium found
> >                              guestfsd : main_loop : proc 282
> > (internal_autosynx) took 0.19  seconds
> >                              *read: unexpected end of file on fd 3 *
> >
> > I got the same error with both ubuntu12.04 and fedora 20 guests. I
know
> > that in ubuntu the guestfsd version is quite but fedora 20 has 1.26
> > libguestfs version i think.
>
> Can you attach a debugger to it and find out where it crashes or
> exits.  Something like:
>
>   # gdb /usr/sbin/guestfsd `pidof guestfsd`
>   (gdb) break exit
>   (gdb) cont
>   ... when it exits ...
>   (gdb) bt
>
> As discussed on IRC, guestfsd is single-threaded at the moment, but
> one of the jobs for 1.28 is to add support for multiple parallel
> connections.
>
> Rich.
>
> --
> Richard Jones, Virtualization Group, Red Hat
> http://people.redhat.com/~rjones
> Read my programming and virtualization blog: http://rwmj.wordpress.com
> virt-p2v converts physical machines to virtual machines.  Boot with a
> live CD or over the network (PXE) and turn machines into KVM guests.
> http://libguestfs.org/virt-v2v
>


-- 

Safa REKIK

Richard W.M. Jones

2014-May-15 11:20 UTC

head link

Re: [Libguestfs] guestfsd crashes when the handle is closed

On Thu, May 15, 2014 at 01:13:47PM +0200, Safa Rekik
wrote:> For fedora 20 guest, this is the back trace output :
> ====================================> *(gdb) bt full*
> #0  0xb73e2040 in exit () from /lib/libc.so.6
> No symbol table info available.
> #1  0xb77263a8 in main_loop ()
> No symbol table info available.
> #2  0xb76fe190 in main ()
> No symbol table info available.
You should install the 'libguestfs-debuginfo' package which will
produce detailed line numbers.  It's not possible to tell what is
happening from this output.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-df lists disk usage of guests without needing to install any
software inside the virtual machine.  Supports Linux and Windows.
http://people.redhat.com/~rjones/virt-df/

Safa Rekik

2014-May-15 13:23 UTC

head link

Re: [Libguestfs] guestfsd crashes when the handle is closed

Hello,

This is the ouotput for fedora guest.
=========================================*#0  0xb73b7040 in exit () from
/lib/libc.so.6*
No symbol table info available.

*#1  0xb76fb3a8 in main_loop (_sock=_sock@entry=3) at proto.c:112*
        xdr = {x_op = XDR_DECODE, x_ops = 0xb753db00 <xdrmem_ops>,
          x_public = 0x0, x_private = 0xbba929d8 ".0", x_base =
0xbba929b0
"",
          x_handy = 0}
        buf = <optimized out>
        lenbuf = "\000\000\000("
        len = 40
        hdr = {prog = 536933877, vers = 4,
          proc = GUESTFS_PROC_INTERNAL_AUTOSYNC,
          direction = GUESTFS_DIRECTION_CALL, serial = 1192960,
          progress_hint = 0, optargs_bitmask = 0, status GUESTFS_STATUS_OK}

*#2  0xb76d3190 in main (argc=2, argv=0xbfedcf34) at guestfsd.c:342*
        options = <synthetic pointer>
        long_options = {{name = 0xb77448b2 "help", has_arg = 0, flag =
0x0,
            val = 63}, {name = 0xb7745fb9 "verbose", has_arg = 0, flag
0x0,
            val = 118}, {name = 0x0, has_arg = 0, flag = 0x0, val = 0}}
        c = <optimized out>
        statbuf = {st_dev = 64769, __pad1 = 0, __st_ino = 2, st_mode 16877,
          st_nlink = 18, st_uid = 0, st_gid = 0, st_rdev = 0, __pad2 = 0,
          st_size = 4096, st_blksize = 4096, st_blocks = 8, st_atim = {
            tv_sec = 1400158599, tv_nsec = 226617083}, st_mtim = {
            tv_sec = 1400154384, tv_nsec = 581000000}, st_ctim = {
            tv_sec = 1400154389, tv_nsec = 390000000}, st_ino = 2}
        sa = {__sigaction_handler = {sa_handler = 0x1, sa_sigaction = 0x1},
          sa_mask = {__val = {0 <repeats 32 times>}}, sa_flags = 0,
          sa_restorer = 0x0}
        channel = <optimized out>
        p = <optimized out>
        sock = 3
        lenbuf = "\365\365", <incomplete sequence \365>
        xdr = {x_op = XDR_ENCODE, x_ops = 0xb753db00 <xdrmem_ops>,
          x_public = 0xb76acc46 <_dl_lookup_symbol_x+214>
"\203",
<incomplete sequence \370>,
          x_private = 0xbfedcd80 "_IMAGE=/vmlinuz-3.11.10-301.fc20.i686
root=/dev/mapper/fedora-root ro rd.lvm.lv=fedora/swap
vconsole.font=latarcyrheb-sun16 rd.lvm.lv=fedora/root rhgb quiet
LANG=fr_FR.UTF-8\n",
          x_base = 0xbfedcd7c
"\365\365_\365_IMAGE=/vmlinuz-3.11.10-301.fc20.i686
root=/dev/mapper/fedora-root ro rd.lvm.lv=fedora/swap
vconsole.font=latarcyrheb-sun16 rd.lvm.lv=fedora/root rhgb quiet
LANG=fr_FR.UTF-8\n", x_handy = 0}
        len = 4126498805
==============================================




2014-05-15 13:20 GMT+02:00 Richard W.M. Jones <rjones@redhat.com>:
> On Thu, May 15, 2014 at 01:13:47PM +0200, Safa Rekik wrote:
> > For fedora 20 guest, this is the back trace output :
> > ====================================> > *(gdb) bt full*
> > #0  0xb73e2040 in exit () from /lib/libc.so.6
> > No symbol table info available.
> > #1  0xb77263a8 in main_loop ()
> > No symbol table info available.
> > #2  0xb76fe190 in main ()
> > No symbol table info available.
>
> You should install the 'libguestfs-debuginfo' package which will
> produce detailed line numbers.  It's not possible to tell what is
> happening from this output.
>
> Rich.
>
> --
> Richard Jones, Virtualization Group, Red Hat
> http://people.redhat.com/~rjones
> Read my programming and virtualization blog: http://rwmj.wordpress.com
> virt-df lists disk usage of guests without needing to install any
> software inside the virtual machine.  Supports Linux and Windows.
> http://people.redhat.com/~rjones/virt-df/
>


-- 

Safa REKIK

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