Bug#685625: grub-probe segfaults

[Stig Sandbeck Mathisen]

Steven Chamberlain <steven at pyro.eu.org> writes:

> Hello again Stig,
>
> I still can't reproduce this with kfreebsd-amd64 that has root/boot on
> ZFS and the same GRUB2 (1.99-22.1). I even replaced my zpool
> executable with something that gives identical output to yours.
>
> I'd be grateful if you could please install the ktrace package and get
> a syscall trace with:
>
> # ktrace -di -- grub-probe --device /dev/ada1s1 --target=fs_uuid
> # kdump -f ktrace.out | gzip > kdump.txt.gz

Attached.

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> Or a GDB backtrace of course:
>
> # gdb $(which grub-probe)
> run --device /dev/ada1s1 --target=fs_uuid
> <crashes>
> bt full
> quit

Here is one of those, it does not look as helpful, though.

Would this look different if a grub-dbg package was available? (or grub
was not stripped?)

,----
| root at discordia:~# gdb $(which grub-probe)
| GNU gdb (GDB) 7.4.1-debian
| Copyright (C) 2012 Free Software Foundation, Inc.
| License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
| This is free software: you are free to change and redistribute it.
| There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
| and "show warranty" for details.
| This GDB was configured as "x86_64-kfreebsd-gnu".
| For bug reporting instructions, please see:
| <http://www.gnu.org/software/gdb/bugs/>...
| Reading symbols from /usr/sbin/grub-probe...(no debugging symbols found)...done.
| (gdb) run --device /dev/ada1s1 --target=fs_uuid
| Starting program: /usr/sbin/grub-probe --device /dev/ada1s1 --target=fs_uuid
| 
| Program received signal SIGSEGV, Segmentation fault.
| 0x0000000800ae8401 in strlen () from /lib/x86_64-kfreebsd-gnu/libc.so.0.1
| (gdb) bt full
| #0  0x0000000800ae8401 in strlen () from /lib/x86_64-kfreebsd-gnu/libc.so.0.1
| No symbol table info available.
| #1  0x000000080086c868 in geom_xml2tree () from /lib/libgeom.so.1
| No symbol table info available.
| #2  0x000000080086cae9 in geom_gettree () from /lib/libgeom.so.1
| No symbol table info available.
| #3  0x00000000004312fe in ?? ()
| No symbol table info available.
| #4  0x00000000004320b8 in ?? ()
| No symbol table info available.
| #5  0x000000000043211a in ?? ()
| No symbol table info available.
| #6  0x000000000043235e in ?? ()
| No symbol table info available.
| #7  0x00000000004310f9 in ?? ()
| No symbol table info available.
| #8  0x000000000043112e in ?? ()
| No symbol table info available.
| #9  0x000000000040218e in ?? ()
| No symbol table info available.
| #10 0x0000000000401ef2 in ?? ()
| No symbol table info available.
| #11 0x0000000800a8d349 in __libc_start_main () from /lib/x86_64-kfreebsd-gnu/libc.so.0.1
| No symbol table info available.
| #12 0x0000000000401fe8 in ?? ()
| No symbol table info available.
| #13 0x00007fffffffd668 in ?? ()
| No symbol table info available.
| #14 0x000000000000001c in ?? ()
| No symbol table info available.
| #15 0x0000000000000000 in ?? ()
| No symbol table info available.
| (gdb) quit
| A debugging session is active.
| 
| 	Inferior 1 [process 284] will be killed.
| 
| Quit anyway? (y or n) y
`----


Thanks. :)

-- 
Stig Sandbeck Mathisen <ssm at debian.org>