Public bug reported:
With long-running jobs on a multi-cpu machine (>10 logical CPUs), the
percent CPU utilization of a process can exceed 1000%, causing a buffer
overflow in pctcpu.
Here is /proc/<pid>/stat for a process that produces the overflow:
# cat /proc/23427/stat
23427 (sdevice) S 16424 23427 16424 34816 23427 4202496 3854777420 3716 11765 0
179490227 1688781 0 0 20 0 44 0 155125884 173169319936 30671991
18446744073709551615 4194304 190125333 140736691917600 140736691909504
47611949540385 0 8192 0 640 18446744073709551615 0 0 17 15 0 0 1540 0 0
And, here's the backtrace if I compile with debugging symbols and run in gdb:
#0 0x00007ffff76d5425 in raise () from /lib/x86_64-linux-gnu/libc.so.6
#1 0x00007ffff76d8b8b in abort () from /lib/x86_64-linux-gnu/libc.so.6
#2 0x00007ffff771339e in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#3 0x00007ffff77a9807 in __fortify_fail ()
from /lib/x86_64-linux-gnu/libc.so.6
#4 0x00007ffff77a8700 in __chk_fail () from /lib/x86_64-linux-gnu/libc.so.6
#5 0x00007ffff77a7b69 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#6 0x00007ffff76eefcb in __printf_fp () from /lib/x86_64-linux-gnu/libc.so.6
#7 0x00007ffff76ea5b8 in vfprintf () from /lib/x86_64-linux-gnu/libc.so.6
#8 0x00007ffff77a7c04 in __vsprintf_chk ()
from /lib/x86_64-linux-gnu/libc.so.6
#9 0x00007ffff77a7b4d in __sprintf_chk () from /lib/x86_64-linux-gnu/libc.so.6
#10 0x00007ffff6473297 in sprintf (__s=0x7dc4f8 "1051.1",
__fmt=0x7ffff6474f9d "%3.2f")
at /usr/include/x86_64-linux-gnu/bits/stdio2.h:34
#11 calc_prec (prs=0x7dc410,
format_str=0x7dc510 "iiisiiiillllljjjjijllljjsiiiiiiSSsSS",
mem_pool=<optimized out>) at OS.c:542
#12 OS_get_table () at OS.c:651
#13 0x00007ffff6474ab8 in XS_Proc__ProcessTable_table (
my_perl=<optimized out>, cv=<optimized out>) at ProcessTable.xs:353
#14 0x00007ffff7b1384f in Perl_pp_entersub () from /usr/lib/libperl.so.5.14
#15 0x00007ffff7b0ace6 in Perl_runops_standard () from /usr/lib/libperl.so.5.14
#16 0x00007ffff7aac36a in perl_run () from /usr/lib/libperl.so.5.14
#17 0x0000000000400db9 in main ()
I have reported this at
https://rt.cpan.org/Public/Bug/Display.html?id=82175 and will put
together a debdiff against 0.45-3 with my patch.
** Affects: libproc-processtable-perl (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1093289
Title:
Buffer overflow in pctcpu
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