[augeas-devel] libguestfs crash in libaugeas

[Matthew Booth]

We're having a problem with libguestfs's daemon crashing during v2v. The 
crash is in libaugeas. We unfortunately don't have a small reproducer, 
but we have finally managed to get a core dump. The stack trace looks 
like this:

#0  0x00007fb490f3763b in pathx_symtab_remove_descendants (
     symtab=<value optimized out>, tree=0x5941900) at pathx.c:2569
#1  0x00007fb490f3580b in tree_rm (p=0x8177da0) at augeas.c:890
#2  0x00007fb490f363e5 in aug_rm (aug=0x57b5e20, path=<value optimized out>)
     at augeas.c:911
#3  0x00007fb490f36b08 in aug_save (aug=0x57b5e20) at augeas.c:1192
#4  0x0000000000403992 in do_aug_save () at augeas.c:332
#5  0x000000000042194f in aug_save_stub (xdr_in=<value optimized out>)
     at stubs.c:623

Interesting local variables:

(gdb) print t
$4 = (struct tree *) 0xc1
(gdb) print *tree
$5 = {next = 0x0, parent = 0x66a5130, label = 0x64f55a0 "saved",
   children = 0x0, value = 0x6a32290 "/files/boot/grub/menu.lst", dirty = 0}

This is augeas-libs-0.7.2-3.fc13.x86_64.

There are many circumstances in which this conversion works. For 
example, if I run the conversion again against the partially converted 
guest it will succeed. This leads me to believe that the problem is 
unlikely to be local to the crash.

Any ideas? I can provide the crashed daemon and core dump for inspection 
if required. I'm also more than happy to test augeas patches.

Thanks,

Matt
-- 
Matthew Booth, RHCA, RHCSS
Red Hat Engineering, Virtualisation Team

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