Public bug reported:
Binary package hint: command-not-found
This concerns command-not-found 0.2.40ubuntu5 in Ubuntu Lucid.
Once upon a time, I was working on my shiny new Lucid system, when
things suddenly became very slow. I ran top(1) to check what was going
on, and saw this:
top - 13:34:17 up 15 min, 5 users, load average: 3.79, 1.41, 0.54
Tasks: 158 total, 2 running, 156 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.6%us, 1.5%sy, 0.0%ni, 15.8%id, 82.1%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 3917500k total, 3890004k used, 27496k free, 480k buffers
Swap: 4200956k total, 1919184k used, 2281772k free, 50180k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2348 userme 20 0 4618m 3.2g 440 D 3 86.7 0:06.95 python
2370 userme 20 0 11000 1308 956 S 1 0.0 0:00.03 top
1587 root 20 0 101m 5788 1524 S 0 0.1 0:04.48 Xorg
Python was going out of control! What was it doing?
# ps uww 2348
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
userme 2348 6.5 84.6 4729240 3316468 tty1 D 13:32 0:07
/usr/bin/python /usr/lib/command-not-found --
mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm...
(The m's went on for like two or three screens.)
Now, I have no idea what caused this bizarre invocation of c-n-f. (I
don't typically sleep with my forehead on the keyboard or anything.)
However, I copied-and-pasted the complete invocation as reported by
ps(1) into a script, and tried running it:
$ time -p sh c-n-f-bug.sh
mmmm[...]mmmm: command not found
real 42.60
user 39.17
sys 1.10
During that time, c-n-f used over a gigabyte of memory. That's not
right!
I am attaching the c-n-f-bug.sh script. Interestingly, it is exactly
4096 bytes long, which suggests to me that the original command
invocation may have been even longer and not reported in full simply due
to ps(1) limiting the output.
** Affects: command-not-found (Ubuntu)
Importance: Undecided
Status: New
--
Pigs out on CPU and memory with overlong input
https://bugs.launchpad.net/bugs/576590
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