This is a note to let you know that I've just added the patch titled
perf sort: Fix segfault with basic block 'cycles' sort dimension
to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: perf-sort-fix-segfault-with-basic-block-cycles-sort-dimension.patch and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From foo@baz Mon Mar 19 09:58:12 CET 2018
From: Changbin Du changbin.du@intel.com Date: Mon, 13 Mar 2017 16:31:48 +0800 Subject: perf sort: Fix segfault with basic block 'cycles' sort dimension
From: Changbin Du changbin.du@intel.com
[ Upstream commit 4b0b3aa6a2756e6115fdf275c521e4552a7082f3 ]
Skip the sample which doesn't have branch_info to avoid segmentation fault:
The fault can be reproduced by:
perf record -a perf report -F cycles
Signed-off-by: Changbin Du changbin.du@intel.com Tested-by: Arnaldo Carvalho de Melo acme@redhat.com Cc: Andi Kleen ak@linux.intel.com Cc: Peter Zijlstra peterz@infradead.org Fixes: 0e332f033a82 ("perf tools: Add support for cycles, weight branch_info field") Link: http://lkml.kernel.org/r/20170313083148.23568-1-changbin.du@intel.com Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- tools/perf/util/sort.c | 5 +++++ 1 file changed, 5 insertions(+)
--- a/tools/perf/util/sort.c +++ b/tools/perf/util/sort.c @@ -604,6 +604,9 @@ static int hist_entry__mispredict_snprin static int64_t sort__cycles_cmp(struct hist_entry *left, struct hist_entry *right) { + if (!left->branch_info || !right->branch_info) + return cmp_null(left->branch_info, right->branch_info); + return left->branch_info->flags.cycles - right->branch_info->flags.cycles; } @@ -611,6 +614,8 @@ sort__cycles_cmp(struct hist_entry *left static int hist_entry__cycles_snprintf(struct hist_entry *he, char *bf, size_t size, unsigned int width) { + if (!he->branch_info) + return scnprintf(bf, size, "%-.*s", width, "N/A"); if (he->branch_info->flags.cycles == 0) return repsep_snprintf(bf, size, "%-*s", width, "-"); return repsep_snprintf(bf, size, "%-*hd", width,
Patches currently in stable-queue which might be from changbin.du@intel.com are
queue-4.4/perf-sort-fix-segfault-with-basic-block-cycles-sort-dimension.patch