lkml.org 
[lkml]   [2010]   [Jan]   [27]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH 0/5][GIT PULL][v2.6.33] tracing: fixes and documentation updates

    * Steven Rostedt <rostedt@goodmis.org> wrote:

    > Ingo,
    >
    > I found that reading the trace file and the raw_trace_pipe using splice, at
    > the same time could cause a kernel oops. Not a major one, that is, the oops
    > only crashes the user task that is performing the read of the trace file.
    > But still urgent enough to go into 2.6.33.
    >
    > The issue is with the iterator that is stored to access multiple reads of
    > the ring buffer without consuming the data. If a user process starts reading
    > the contents of the ring buffer with the iterator, and in the mean time a
    > consuming read is done, then the iterator can become stale and return a
    > bogus entry.
    >
    > The first patch fixes the pid to cmdline mapping function to not crash when
    > given a negative pid (which happened when we had a bogus entry).
    >
    > The next two patches fix the ring buffer to detect when a consuming
    > read is done and to reset the iterator.
    >
    > Since I'm pushing these patches up, I've also incuded two
    > documentation changes. One of the patches touches a Kconfig file
    > but only the help portion of it.
    >
    > Please pull the latest tip/tracing/urgent tree, which can be found at:
    >
    > git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace.git
    > tip/tracing/urgent
    >
    >
    > Mike Frysinger (1):
    > tracing/documentation: Cover new frame pointer semantics
    >
    > Steven Rostedt (3):
    > tracing: Prevent kernel oops with corrupted buffer
    > ring-buffer: Check if ring buffer iterator has stale data
    > ring-buffer: Check for end of page in iterator
    >
    > Yang Hongyang (1):
    > tracing/documentation: Fix a typo in ftrace.txt
    >
    > ----
    > Documentation/trace/ftrace-design.txt | 26 +++++++++++++++++++++++---
    > Documentation/trace/ftrace.txt | 2 +-
    > kernel/trace/Kconfig | 4 +---
    > kernel/trace/ring_buffer.c | 24 +++++++++++++++++++++---
    > kernel/trace/trace.c | 5 +++++
    > 5 files changed, 51 insertions(+), 10 deletions(-)

    Pulled, thanks a lot Steve!

    Ingo


    \
     
     \ /
      Last update: 2010-01-27 10:39    [W:0.028 / U:90.508 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site