This bug is missing log files that will aid in diagnosing the problem.
While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:
apport-collect 1835940
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1835940
Title:
perf core dump at tool/perf/util/namespaces.c:144
Status in linux package in Ubuntu:
Incomplete
Bug description:
Running the following perf collect inside a running docker could
potentially crash:
$ perf record -F 100 -ag -o /tmp/perf-100Hz-10s -- sleep 10
The dump is caused by SIGSEGV for de-referencing nullptr in
nsinfo__copy() in at namespaces.c:144
$ lldb -c /tmp/cores/perf.core.07092019
(lldb) target create --core "/tmp/cores/perf.core.07092019"
Core file '/tmp/cores/perf.core.07092019' (x86_64) was loaded.
(lldb) bt
* thread #1, name = 'perf', stop reason = signal SIGSEGV
* frame #0: 0x0000558f2dda2014 perf`nsinfo__copy(nsi=0x0000000000000000) at
namespaces.c:144
frame #1: 0x0000558f2dd98779 perf`map__new(machine=0x0000558f31213c48,
start=140723782385664, len=8192, pgoff=0, d_maj=<unavailable>,
d_min=<unavailable>, ino=0, ino_gen=0, prot=5, flags=4098, filename="",
type=MAP__FUNCTION, thread=0x0000558f316f94c0) at map.c:192
frame #2: 0x0000558f2dd96a39
perf`machine__process_mmap2_event(machine=0x0000558f31213c48,
event=0x00007fdd8f1105f0, sample=<unavailable>) at machine.c:1428
frame #3: 0x0000558f2dd9d7bc perf`ordered_events__deliver_event at
session.c:1343
frame #4: 0x0000558f2dd9d798 perf`ordered_events__deliver_event
frame #5: 0x0000558f2dd9d790
perf`ordered_events__deliver_event(oe=0x0000558f31219e00, event=<unavailable>)
at session.c:120
frame #6: 0x0000558f2dda1073 perf`ordered_events__flush at
ordered-events.c:211
frame #7: 0x0000558f2dda0fb6
perf`ordered_events__flush(oe=0x0000558f31219e00, how=OE_FLUSH__ROUND) at
ordered-events.c:278
frame #8: 0x0000558f2dd9e854 perf`perf_session__process_event at
session.c:1383
frame #9: 0x0000558f2dd9e570
perf`perf_session__process_event(session=0x0000558f31213b60,
event=0x00007fdd8f148050, file_offset=565328) at session.c:1511
frame #10: 0x0000558f2dd9ff40 perf`perf_session__process_events at
session.c:1903
frame #11: 0x0000558f2dd9fec0
perf`perf_session__process_events(session=0x0000558f31213b60) at session.c:1957
frame #12: 0x0000558f2dcd76bc perf`cmd_record at builtin-record.c:442
frame #13: 0x0000558f2dcd7695 perf`cmd_record at builtin-record.c:574
frame #14: 0x0000558f2dcd7695 perf`cmd_record at builtin-record.c:1115
frame #15: 0x0000558f2dcd7601 perf`cmd_record(argc=<unavailable>,
argv=<unavailable>) at builtin-record.c:1809
frame #16: 0x0000558f2dd3da01 perf`run_builtin(p=0x0000558f2e1f12b8,
argc=9, argv=0x00007ffc21201e30) at perf.c:297
frame #17: 0x0000558f2dd3dcfe perf`handle_internal_command(argc=9,
argv=0x00007ffc21201e30) at perf.c:349
frame #18: 0x0000558f2dcc17b9 perf`main [inlined]
run_argv(argcp=<unavailable>, argv=<unavailable>) at perf.c:393
frame #19: 0x0000558f2dcc17ae perf`main(argc=<unavailable>,
argv=0x00007ffc21201e30) at perf.c:537
frame #20: 0x00007fdd8fad5b97 libc.so.6`__libc_start_main + 231
frame #21: 0x0000558f2dcc1c3a perf`_start + 42
The fix for this has already been merged to Linux 4.19-rc, since
8/10/2018, see the original lkml post
https://lore.kernel.org/lkml/20180810133614.9925-1-bev...@mesosphere.com/.
bf2e710b3cb84 (Krister Johansen 2017-07-05 18:48:09 -0700 137) struct
nsinfo *nsinfo__copy(struct nsinfo *nsi)
bf2e710b3cb84 (Krister Johansen 2017-07-05 18:48:09 -0700 138) {
bf2e710b3cb84 (Krister Johansen 2017-07-05 18:48:09 -0700 139)
struct nsinfo *nnsi;
bf2e710b3cb84 (Krister Johansen 2017-07-05 18:48:09 -0700 140)
3f4417d693b43 (Benno Evers 2018-08-10 15:36:13 +0200 141) if
(nsi == NULL)
3f4417d693b43 (Benno Evers 2018-08-10 15:36:13 +0200 142)
return NULL;
3f4417d693b43 (Benno Evers 2018-08-10 15:36:13 +0200 143)
bf2e710b3cb84 (Krister Johansen 2017-07-05 18:48:09 -0700 144) nnsi
= calloc(1, sizeof(*nnsi));
I verified locally that this fix works by manually applying to 4.15
and rebuild perf executable after that.
To port the fix to 4.15, or other versions earlier than 4.19-rc, we could run:
$ git cherry-pick 3f4417d693b43
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