https://bugs.documentfoundation.org/show_bug.cgi?id=97863
Bug ID: 97863
Summary: FILEOPEN: XLS import hangs with 100% cpu usage
Product: LibreOffice
Version: unspecified
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: UNCONFIRMED
Severity: normal
Priority: medium
Component: Calc
Assignee: [email protected]
Reporter: [email protected]
Using LibreOffice version 5.1.0.3 5e3e00a007d9b3b6efb6797a8b8e57b51ab1f737
(Debian download from lo.org).
Trying to open MS XLS file (3.1MB, not attaching) from
http://www.tulli.fi/fi/yksityisille/autoverotus/taulukot/autot/au/012015.xls
(Finnish customs statistics for imported used cars), LO "hangs" with 100% CPU
usage. Not sure about its content, but it should have a sheet for every month
with a few hundred rows for constants, should not have any formulas, fancy
formatting or such.
I have no source but gdb backtrace points to
(gdb) bt
#0 0x00007f2b3b1596c0 in XclImpExtName::MOper::MOper(svl::SharedStringPool&,
XclImpStream&) ()
from /opt/libreoffice5.1/program/libscfiltlo.so
#1 0x00007f2b3b15b34e in XclImpExtName::XclImpExtName(XclImpSupbook&,
XclImpStream&, XclSupbookType, ExcelToSc*) ()
from /opt/libreoffice5.1/program/libscfiltlo.so
#2 0x00007f2b3b15bfca in XclImpSupbook::ReadExternname(XclImpStream&,
ExcelToSc*) () from /opt/libreoffice5.1/program/libscfiltlo.so
#3 0x00007f2b3b05f5e9 in ImportExcel8::Read() () from
/opt/libreoffice5.1/program/libscfiltlo.so
#4 0x00007f2b3b03704b in ScFormatFilterPluginImpl::ScImportExcel(SfxMedium&,
ScDocument*, EXCIMPFORMAT) ()
from /opt/libreoffice5.1/program/libscfiltlo.so
#5 0x00007f2b3ce1d0de in ScDocShell::ConvertFrom(SfxMedium&) () from
/opt/libreoffice5.1/program/../program/libsclo.so
...
Looking from disassembly it is spinning in the nested for loop @
https://github.com/LibreOffice/core/blob/5e3e00a007d9b3b6efb6797a8b8e57b51ab1f737/sc/source/filter/excel/xilink.cxx#L289.
Setting a breakpoint at the end of the outermost loop (nRow <= nLastRow):
(gdb) disassemble
...
0x00007f2b3b159747 <+327>: add $0x1,%r15
0x00007f2b3b15974b <+331>: cmp 0x28(%rsp),%r15
0x00007f2b3b159750 <+336>: jbe 0x7f2b3b1596c0
<_ZN13XclImpExtName5MOperC2ERN3svl16SharedStringPoolER12XclImpStream+192>
...
(gdb) break *0x00007f2b3b15974b
and running it
(gdb) cont
Continuing.
Breakpoint 1, 0x00007f2b3b15974b in
XclImpExtName::MOper::MOper(svl::SharedStringPool&, XclImpStream&) ()
from /opt/libreoffice5.1/program/libscfiltlo.so
(gdb) p $r15
$42 = 19240055
(gdb) x/gx $rsp+0x28
0x7ffeadb55d08: 0xffffffffffffffff
The limit nLastRow is ULONG_MAX and the test being for "unsigned less or equal"
it will spin there forever.
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