Messages in this thread Patch in this message | | | Date | Mon, 23 Jul 2012 08:52:17 -0500 | From | Andrew Watts <> | Subject | [SEGFAULT: perf] |
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perf report on 3.4.6 segfaults when certain pointers are null. Attached is a patch that applies cleanly @3.4.6 and addresses (A). I am not comfortable suggesting fixes for (B) and (C).
~ Andy
===
(A) perf report with sort on comm/pid/parent/dso:
(gdb) run report --sort=comm Program received signal SIGSEGV, Segmentation fault. 0x0805c00b in perf_evsel__add_hist_entry (evsel=0x81c56a8, al=0xbfffe9b0, sample=0xbfffea84, machine=0x81c3fa8) at builtin-report.c:171 171 if (notes->src == NULL && symbol__alloc_hist(he->ms.sym) < 0) #0 0x0805c00b in perf_evsel__add_hist_entry (evsel=0x81c56a8, al=0xbfffe9b0, sample=0xbfffea84, machine=0x81c3fa8) at builtin-report.c:171 #1 0x0805c234 in process_sample_event (tool=0xbffff27c, event=0xb6db1f38, sample=0xbfffea84, evsel=0x81c56a8, machine=0x81c3fa8) at builtin-report.c:216 #2 0x080a3097 in perf_session_deliver_event (session=0x81c3f50, event= 0xb6db1f38, sample=0xbfffea84, tool=0xbffff27c, file_offset=339768) at util/session.c:885 #3 0x080a24d1 in flush_sample_queue (s=0x81c3f50, tool=0xbffff27c) at util/session.c:587 #4 0x080a40e3 in __perf_session__process_events (session=0x81c3f50, data_offset=280, data_size=419640, file_size=419920, tool=0xbffff27c) at util/session.c:1257 #5 0x080a41d3 in perf_session__process_events (self=0x81c3f50, tool= 0xbffff27c) at util/session.c:1273 (gdb) print he->ms.sym $1 = (struct symbol *) 0x0
--
(B) perf report segfaults on sorts of symbol_from/symbol_to:
(gdb) run report --sort=symbol_from Program received signal SIGSEGV, Segmentation fault. 0x080b8777 in sort__sym_from_cmp (left=0xbfffe878, right=0x84dfde0) at util/sort.c:334 334 if (!from_l->sym && !from_r->sym (gdb) bt #0 0x080b8777 in sort__sym_from_cmp (left=0xbfffe878, right=0x84dfde0) at util/sort.c:334 #1 0x080ba0b8 in hist_entry__cmp (left=0xbfffe878, right=0x84dfde0) at util/hist.c:345 #2 0x080b9c31 in add_hist_entry (hists=0x81c571c, entry=0xbfffe878, al= 0xbfffe9b0, period=333940) at util/hist.c:254 #3 0x080ba04c in __hists__add_entry (self=0x81c571c, al=0xbfffe9b0, sym_parent=0x0, period=333940) at util/hist.c:335 #4 0x0805bf50 in perf_evsel__add_hist_entry (evsel=0x81c56a8, al=0xbfffe9b0, sample=0xbfffea84, machine=0x81c3fa8) at builtin-report.c:149 #5 0x0805c234 in process_sample_event (tool=0xbffff27c, event=0xb6db1840, sample=0xbfffea84, evsel=0x81c56a8, machine=0x81c3fa8) at builtin-report.c:216 (gdb) print left->branch_info $2 = (struct branch_info *) 0x0 (gdb) print right->branch_info $3 = (struct branch_info *) 0x0
--
(C) perf report segfaults with dso_from/dso_to:
(gdb) run report --sort=dso_to Program received signal SIGSEGV, Segmentation fault. sort__dso_to_cmp (left=0xbfffe878, right=0x82346f0) at util/sort.c:317 317 return _sort__dso_cmp(left->branch_info->to.map, (gdb) bt #0 sort__dso_to_cmp (left=0xbfffe878, right=0x82346f0) at util/sort.c:317 #1 0x080ba0c8 in hist_entry__cmp (left=0xbfffe878, right=0x82346f0) at util/hist.c:345 #2 0x080b9c41 in add_hist_entry (hists=0x81c571c, entry=0xbfffe878, al= 0xbfffe9b0, period=333331) at util/hist.c:254 #3 0x080ba05c in __hists__add_entry (self=0x81c571c, al=0xbfffe9b0, sym_parent=0x0, period=333331) at util/hist.c:335 #4 0x0805bf50 in perf_evsel__add_hist_entry (evsel=0x81c56a8, al=0xbfffe9b0, sample=0xbfffea84, machine=0x81c3fa8) at builtin-report.c:149 #5 0x0805c242 in process_sample_event (tool=0xbffff27c, event=0xb6dbf800, sample=0xbfffea84, evsel=0x81c56a8, machine=0x81c3fa8) at builtin-report.c:216 (gdb) print left->branch_info $4 = (struct branch_info *) 0x0 (gdb) print right->branch_info $5 = (struct branch_info *) 0x0
===
--- builtin-report.c.orig 2012-07-22 +++ builtin-report.c 2012-07-22 @@ -162,7 +162,7 @@ static int perf_evsel__add_hist_entry(st * so we don't allocated the extra space needed because the stdio * code will not use it. */ - if (al->sym != NULL && use_browser > 0) { + if (al->sym != NULL && he->ms.sym != NULL && use_browser > 0) { struct annotation *notes = symbol__annotation(he->ms.sym); assert(evsel != NULL); | |