diff options
| author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2010-03-11 15:53:11 -0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-03-11 20:00:32 +0100 |
| commit | 9f591fd76afdc0e5192e9ed00a36f8efc0b4dfe6 (patch) | |
| tree | 6692dc95d4d799431a8b403a206660546f066a16 /kernel/.gitignore | |
| parent | 639fe4b12f92b54c9c3b38c82cdafaa38cfd3e63 (diff) | |
perf record: Don't try to find buildids in a zero sized file
Fixing this symptom:
[acme@mica linux-2.6-tip]$ perf record -a -f
Fatal: Permission error - are you root?
Bus error
[acme@mica linux-2.6-tip]$
I.e. if for some reason no data is collected, in this case a non
root user trying to do systemwide profiling, no data will be
collected, and then we end up trying to mmap a zero sized file
and access the file header, b00m.
Reported-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: <stable@kernel.org>
LKML-Reference: <1268333592-30872-1-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/.gitignore')
0 files changed, 0 insertions, 0 deletions