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| Started by | Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> |
|---|---|
| First post | 2015-11-18 07:50 +0100 |
| Last post | 2015-11-23 17:20 +0100 |
| Articles | 3 — 3 participants |
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[PATCH perf/core 06/13] perf: Fix machine__destroy_kernel_maps to put vmlinux_maps Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> - 2015-11-18 07:50 +0100
Re: [PATCH perf/core 06/13] perf: Fix machine__destroy_kernel_maps to put vmlinux_maps Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-11-18 23:40 +0100
[tip:perf/core] perf machine: Fix machine__destroy_kernel_maps to drop vmlinux_maps references tip-bot for Masami Hiramatsu <tipbot@zytor.com> - 2015-11-23 17:20 +0100
| From | Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> |
|---|---|
| Date | 2015-11-18 07:50 +0100 |
| Subject | [PATCH perf/core 06/13] perf: Fix machine__destroy_kernel_maps to put vmlinux_maps |
| Message-ID | <qw4J3-7HS-1@gated-at.bofh.it> |
Fix machine__destroy_kernel_maps() to put vmlinux_maps before
filling it with NULL.
Refcnt debugger shows
==== [1] ====
Unreclaimed map: 0x36b1070
Refcount +1 => 1 at
./perf(map__new2+0xb5) [0x4bdec5]
./perf(machine__create_kernel_maps+0x72) [0x4bb152]
./perf(machine__new_host+0xfa) [0x4bb41a]
./perf(init_probe_symbol_maps+0x93) [0x5062d3]
./perf() [0x455ffa]
./perf(cmd_probe+0x6c) [0x4566bc]
./perf() [0x47abc5]
./perf(main+0x610) [0x421f90]
/lib64/libc.so.6(__libc_start_main+0xf5) [0x7f1fc9fc4af5]
./perf() [0x4220a9]
Refcount +1 => 2 at
./perf(maps__insert+0x9a) [0x4bfd6a]
./perf(machine__create_kernel_maps+0xc3) [0x4bb1a3]
./perf(machine__new_host+0xfa) [0x4bb41a]
./perf(init_probe_symbol_maps+0x93) [0x5062d3]
./perf() [0x455ffa]
./perf(cmd_probe+0x6c) [0x4566bc]
./perf() [0x47abc5]
./perf(main+0x610) [0x421f90]
/lib64/libc.so.6(__libc_start_main+0xf5) [0x7f1fc9fc4af5]
./perf() [0x4220a9]
Refcount -1 => 1 at
./perf(map_groups__exit+0x94) [0x4bea74]
./perf(machine__delete+0x3d) [0x4b91fd]
./perf(exit_probe_symbol_maps+0x28) [0x506378]
./perf() [0x45628a]
./perf(cmd_probe+0x6c) [0x4566bc]
./perf() [0x47abc5]
./perf(main+0x610) [0x421f90]
/lib64/libc.so.6(__libc_start_main+0xf5) [0x7f1fc9fc4af5]
./perf() [0x4220a9]
map__new2() returns map with refcnt = 1, and also
map_groups__insert gets it again in__machine__create_kernel_maps().
machine__destroy_kernel_maps() calls map_groups__remove() to
decrement the refcnt, but before decrement it again (corresponding
to map__new2), it makes vmlinux_maps[type] = NULL. And this may
cause a refcnt leak.
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
---
tools/perf/util/machine.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 5ca4064..7c647d3 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -789,6 +789,7 @@ void machine__destroy_kernel_maps(struct machine *machine)
kmap->ref_reloc_sym = NULL;
}
+ map__put(machine->vmlinux_maps[type]);
machine->vmlinux_maps[type] = NULL;
}
}
--
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| From | Arnaldo Carvalho de Melo <acme@kernel.org> |
|---|---|
| Date | 2015-11-18 23:40 +0100 |
| Subject | Re: [PATCH perf/core 06/13] perf: Fix machine__destroy_kernel_maps to put vmlinux_maps |
| Message-ID | <qwjyq-RO-29@gated-at.bofh.it> |
| In reply to | #1271868 |
Em Wed, Nov 18, 2015 at 03:40:22PM +0900, Masami Hiramatsu escreveu: > Fix machine__destroy_kernel_maps() to put vmlinux_maps before > filling it with NULL. Applied to perf/urgent. - Arnaldo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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| From | tip-bot for Masami Hiramatsu <tipbot@zytor.com> |
|---|---|
| Date | 2015-11-23 17:20 +0100 |
| Subject | [tip:perf/core] perf machine: Fix machine__destroy_kernel_maps to drop vmlinux_maps references |
| Message-ID | <qy20p-4cV-13@gated-at.bofh.it> |
| In reply to | #1271868 |
Commit-ID: e96e4078e9a5ea150b3ad9a296440a7976439e4a
Gitweb: http://git.kernel.org/tip/e96e4078e9a5ea150b3ad9a296440a7976439e4a
Author: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
AuthorDate: Wed, 18 Nov 2015 15:40:22 +0900
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Thu, 19 Nov 2015 13:19:18 -0300
perf machine: Fix machine__destroy_kernel_maps to drop vmlinux_maps references
Fix machine__destroy_kernel_maps() to drop vmlinux_maps references
before filling it with NULL.
Refcnt debugger shows
==== [1] ====
Unreclaimed map: 0x36b1070
Refcount +1 => 1 at
./perf(map__new2+0xb5) [0x4bdec5]
./perf(machine__create_kernel_maps+0x72) [0x4bb152]
./perf(machine__new_host+0xfa) [0x4bb41a]
./perf(init_probe_symbol_maps+0x93) [0x5062d3]
./perf() [0x455ffa]
./perf(cmd_probe+0x6c) [0x4566bc]
./perf() [0x47abc5]
./perf(main+0x610) [0x421f90]
/lib64/libc.so.6(__libc_start_main+0xf5) [0x7f1fc9fc4af5]
./perf() [0x4220a9]
Refcount +1 => 2 at
./perf(maps__insert+0x9a) [0x4bfd6a]
./perf(machine__create_kernel_maps+0xc3) [0x4bb1a3]
./perf(machine__new_host+0xfa) [0x4bb41a]
./perf(init_probe_symbol_maps+0x93) [0x5062d3]
./perf() [0x455ffa]
./perf(cmd_probe+0x6c) [0x4566bc]
./perf() [0x47abc5]
./perf(main+0x610) [0x421f90]
/lib64/libc.so.6(__libc_start_main+0xf5) [0x7f1fc9fc4af5]
./perf() [0x4220a9]
Refcount -1 => 1 at
./perf(map_groups__exit+0x94) [0x4bea74]
./perf(machine__delete+0x3d) [0x4b91fd]
./perf(exit_probe_symbol_maps+0x28) [0x506378]
./perf() [0x45628a]
./perf(cmd_probe+0x6c) [0x4566bc]
./perf() [0x47abc5]
./perf(main+0x610) [0x421f90]
/lib64/libc.so.6(__libc_start_main+0xf5) [0x7f1fc9fc4af5]
./perf() [0x4220a9]
map__new2() returns map with refcnt = 1, and also map_groups__insert
gets it again in__machine__create_kernel_maps().
machine__destroy_kernel_maps() calls map_groups__remove() to
decrement the refcnt, but before decrement it again (corresponding
to map__new2), it makes vmlinux_maps[type] = NULL. And this may
cause a refcnt leak.
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20151118064022.30709.3897.stgit@localhost.localdomain
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/machine.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 0487d77..e9e09be 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -790,6 +790,7 @@ void machine__destroy_kernel_maps(struct machine *machine)
kmap->ref_reloc_sym = NULL;
}
+ map__put(machine->vmlinux_maps[type]);
machine->vmlinux_maps[type] = NULL;
}
}
--
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