$ gdb sleep
GNU gdb 6.6-debian
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This GDB was configured as "i486-linux-gnu"...
(no debugging symbols found)
Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
(gdb) run 300
Starting program: /bin/sleep 300
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)

Program received signal SIGINT, Interrupt.
0xb7f997f2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
(gdb) bt
#0  0xb7f997f2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
#1  0xb7eb3e10 in __nanosleep_nocancel () from /lib/tls/i686/cmov/libc.so.6
#2  0x0804a1da in ?? ()
#3  0xbfe9f664 in ?? ()
#4  0x00000000 in ?? ()
(gdb) quit
The program is running.  Exit anyway? (y or n) y

$ uname -r
2.6.20-6-generic

$ LC_ALL=en_US apt-cache policy linux-image-`uname -r`
linux-image-2.6.20-6-generic:
  Installed: 2.6.20-6.8
  Candidate: 2.6.20-6.8
  Version table:
 *** 2.6.20-6.8 0
        500 http://archive.ubuntu.com feisty/main Packages
        500 http://security.ubuntu.com feisty/main Packages
        100 /var/lib/dpkg/status