I can now recreate the memory bloat using a basic NIH D-Bus server
program and associated client program.
1) Run the server as:
$ ./test_nih_dbus_server unix:abstract=/com/hunt/james/foo
com.hunt.james.Foo /com/hunt/james/Foo
2) Run the client as:
$ ./test_nih_dbus_client unix:abstract=/com/hunt/james/foo
com.hunt.james.Foo
3) Run the updated spammer as:
$ ./spam_dbus_server.sh
4) Run top and watch the memory used by test_nih_dbus_server creep up.
The problem seems to be caused by the call to notify_clients() - this
sends a signal to every connected client every time the
spam_dbus_server.sh sends its data to the server. Commenting out the
call to notify_clients() stop the memory bloating issue.
The function echo_handled() that is called by notify_clients() is
analogous to control_emit_event_emitted() in Upstart parlance.
Again, running valgrind on the server shows the same stack traces as
above:
==30015== 91,750,175 bytes in 7,617 blocks are still reachable in loss record
164 of 164
==30015== at 0x402BB88: realloc (in
/usr/lib/valgrind/vgpreload_memcheck-x86-linux.so)
==30015== by 0x408E778: dbus_realloc (dbus-memory.c:678)
==30015== by 0x408F08C: reallocate_for_length (dbus-string.c:349)
==30015== by 0x408F12B: set_length (dbus-string.c:390)
==30015== by 0x408F1A9: open_gap (dbus-string.c:411)
==30015== by 0x408FA67: copy (dbus-string.c:1198)
==30015== by 0x408FCCE: _dbus_string_copy_len (dbus-string.c:1368)
==30015== by 0x408DCF8: marshal_len_followed_by_bytes
(dbus-marshal-basic.c:726)
==30015== by 0x408DD95: marshal_string (dbus-marshal-basic.c:758)
==30015== by 0x408DF60: _dbus_marshal_write_basic (dbus-marshal-basic.c:840)
==30015== by 0x4075CD7: _dbus_type_writer_write_basic_no_typecode
(dbus-marshal-recursive.c:1601)
==30015== by 0x40768BB: _dbus_type_writer_write_basic
(dbus-marshal-recursive.c:2323)
** Attachment added: "test_nih_dbus_server.c"
https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1235649/+attachment/3878663/+files/test_nih_dbus_server.c
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https://bugs.launchpad.net/bugs/1235649
Title:
uevent spam causes libdbus client code in session upstart to consume
massive amounts of memory on Ubuntu Touch
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