On 04/10/2016, 08:37 PM, Greg Kroah-Hartman wrote: > 3.14-stable review patch. If anyone has any objections, please let me know. > > ------------------ > > From: Jiri Olsa <jolsa@xxxxxxxxxx> > > commit 3135a66b768c5ee84c8a98b21d0330dc1c1234b4 upstream. Where does this come from? fatal: bad object 3135a66b768c5ee84c8a98b21d0330dc1c1234b4 The same for the later perf patch. > Using PAGE_SIZE buffers makes the WRMSR to PERF_GLOBAL_CTRL in > intel_pmu_enable_all() mysteriously hang on Core2. As a workaround, we > don't do this. > > The hard lockup is easily triggered by running 'perf test attr' > repeatedly. Most of the time it gets stuck on sample session with > small periods. > > # perf test attr -vv > 14: struct perf_event_attr setup : > --- start --- > ... > 'PERF_TEST_ATTR=/tmp/tmpuEKz3B /usr/bin/perf record -o /tmp/tmpuEKz3B/perf.data -c 123 kill >/dev/null 2>&1' ret 1 > > Reported-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> > Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx> > Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> > Reviewed-by: Andi Kleen <ak@xxxxxxxxxxxxxxx> > Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx> > Cc: Jiri Olsa <jolsa@xxxxxxxxxx> > Cc: Kan Liang <kan.liang@xxxxxxxxx> > Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> > Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> > Cc: Stephane Eranian <eranian@xxxxxxxxxx> > Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> > Cc: Vince Weaver <vincent.weaver@xxxxxxxxx> > Cc: Wang Nan <wangnan0@xxxxxxxxxx> > Link: http://lkml.kernel.org/r/20160301190352.GA8355@xxxxxxxxxxxxxxxx > Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> > Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> > --- > arch/x86/kernel/cpu/perf_event.h | 1 + > arch/x86/kernel/cpu/perf_event_intel_ds.c | 13 +++++++++++-- > 2 files changed, 12 insertions(+), 2 deletions(-) thanks, -- js suse labs -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html