requested update while update in progress

I should add that it enters this loop as the program starts, no user input is needed (or possible) to trigger the problem.

The problem was introduced at revision 12978.
"make clean" did not resolve the issue.

The system I tested this on is

DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=12.04
DISTRIB_CODENAME=precise
DISTRIB_DESCRIPTION="Ubuntu 12.04.3 LTS"

  gcc --version
gcc-4.6.real (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3
Copyright (C) 2011 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

> The problem was introduced at revision 12978.

Duplicate of bug #1272649?

See also comments of bug #1274158 (the same console messages, but with r12976).

Interesting.

Probably an access to uninitialized memory or something along those lines, which would explain why the symptoms vary from machine to machine. Testing was a binary search with these final results:

12983 bad
12982 bad
12979 bad
12978 bad
12977 good
12976 good
12970 good

all the bad ones failed the same way for me.

There are not that many changes in 12978, perhaps I can figure out the problem. Link to whichever other bug you want to be the primary.

Ran it in the debugger and it had different symptoms. It stopped here:

Program received signal SIGSEGV, Segmentation fault.
0x08230e1b in SPObject::detach (this=0xa1329b8, object=0x5f9) at sp-object.cpp:539
539 g_return_if_fail(object->parent == this);
(gdb) bt
#0 0x08230e1b in SPObject::detach (this=0xa1329b8, object=0x5f9) at sp-object.cpp:539
#1 0x081f733b in SPImage::clear_image (this=0xa1329b8) at sp-image.cpp:537
#2 0x081f6aae in SPImage::update (this=0xa1329b8, ctx=0xbfffca90, flags=125) at sp-image.cpp:330
#3 0x082326c8 in SPObject::updateDisplay (this=0xa1329b8, ctx=0xbfffca90, flags=125) at sp-object.cpp:1144
#4 0x082024a6 in SPGroup::update (this=0xa132540, ctx=0xbfffcbb0, flags=95) at sp-item-group.cpp:186
#5 0x082326c8 in SPObject::updateDisplay (this=0xa132540, ctx=0xbfffcbb0, flags=95) at sp-object.cpp:1144
#6 0x082024a6 in SPGroup::update (this=0xa131a50, ctx=0xbfffccd0, flags=95) at sp-item-group.cpp:186
#7 0x082326c8 in SPObject::updateDisplay (this=0xa131a50, ctx=0xbfffccd0, flags=95) at sp-object.cpp:1144
#8 0x082024a6 in SPGroup::update (this=0xa131630, ctx=0xbfffcdf0, flags=95) at sp-item-group.cpp:186
#9 0x082326c8 in SPObject::updateDisplay (this=0xa131630, ctx=0xbfffcdf0, flags=95) at sp-object.cpp:1144
#10 0x082024a6 in SPGroup::update (this=0xa91a948, ctx=0xbfffcf74, flags=27) at sp-item-group.cpp:186
#11 0x082447be in SPRoot::update (this=0xa91a948, ctx=0xbfffd1a8, flags=27) at sp-root.cpp:496
#12 0x082326c8 in SPObject::updateDisplay (this=0xa91a948, ctx=0xbfffd1a8, flags=27) at sp-object.cpp:1144
#13 0x080d8dd9 in SPDocument::_updateDocument (this=0x922dee0) at document.cpp:1072
#14 0x080d8e80 in SPDocument::ensureUpToDate (this=0x922dee0) at document.cpp:1099
#15 0x084c748b in SVGDocCache::SVGDocCache (this=0xb4d56a8, doc=0x922dee0) at widgets/icon.cpp:1221
#16 0x084c5624 in IconImpl::load_svg_pixels (names=..., psize=18, stride=@0xbfffd3b4: 174706048) at widgets/icon.cpp:1298
#17 0x084c62d8 in IconImpl::prerenderIcon (name=0xa6afa90 "edit-undo", lsize=GTK_ICON_SIZE_SMALL_TOOLBAR, psize=18) at widgets/icon.cpp:1427
#18 0x084c711b in IconImpl::imageMapNamedCB (widget=0xa5b1538, user_data=0x0) at widgets/icon.cpp:1640
#19 0x012911ec in g_cclosure_marshal_VOID__VOID () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
#20 0x0128f484 in g_closure_invoke () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0

The reason it stopped there is:
(gdb) print object
$15 = (SPObject *) 0x5f9
(gdb) print object->parent
Cannot access memory at address 0x611
(gdb) up
#1 0x081f733b in SPImage::clear_image (this=0xa1329b8) at sp-image.cpp:537
537 this->detach(this->child);
(gdb) print this
$16 = (SPImage * const) 0xa1329b8
(gdb) print this->child
$17 = (SPItem *) 0x5f9
(gdb) print this->child.parent
Cannot access memory at address 0x611
(gdb) up
#2 0x081f6aae in SPImage::update (this=0xa1329b8, ctx=0xbfffca90, flags=125) at sp-image.cpp:330
330 this->clear_image();
(gdb) print this->child.parent
Cannot access memory at address 0x611
(gdb) up
#3 0x082326c8 in SPObject::updateDisplay (this=0xa1329b8, ctx=0xbfffca90, flags=125) at sp-object.cpp:1144
1144 this->update(ctx, flags);...

> Program received signal SIGSEGV, Segmentation fault.
> 0x08230e1b in SPObject::detach (this=0xa1329b8, object=0x5f9) at sp-object.cpp:539
> 539 g_return_if_fail(object->parent == this);

Linking as duplicate to bug #1272649.

revision 12984 works. (Doesn't crash as noted above, images seem to be handled properly.)