linux-kernel - V3.10-rc1 memory leak

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Message-ID: <51912567.6090507@lwfinger.net>
Date:	Mon, 13 May 2013 12:39:51 -0500
From:	Larry Finger <Larry.Finger@...inger.net>
To:	"zhangwei(Jovi)" <jovi.zhangwei@...wei.com>,
	Steven Rostedt <srostedt@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: V3.10-rc1 memory leak

Using v3.10-rc1-68-g2d3ec09, I am getting many instances of the following from 
kmemleak:

unreferenced object 0xffff8800b546dc30 (size 48):
   comm "systemd-udevd", pid 2181, jiffies 4294899141 (age 274.096s)
   hex dump (first 32 bytes):
     00 dc 46 b5 00 88 ff ff d0 ff 5b a0 ff ff ff ff  ..F.......[.....
     1c 3b 5b a0 ff ff ff ff 12 3a 5b a0 ff ff ff ff  .;[......:[.....
   backtrace:
     [<ffffffff81432e81>] kmemleak_alloc+0x21/0x50
     [<ffffffff81143c2b>] kmem_cache_alloc+0x11b/0x270
     [<ffffffff810e9ee0>] __trace_define_field+0x40/0xd0
     [<ffffffff810e9fc5>] trace_define_field+0x55/0x70
     [<ffffffffa05e6ba0>] 0xffffffffa05e6ba0
     [<ffffffff810ea735>] event_create_dir+0x2e5/0x480
     [<ffffffff810ea920>] __trace_add_new_event+0x50/0x80
     [<ffffffff810eacf9>] __add_event_to_tracers+0x69/0xc0
     [<ffffffff810eb4e1>] trace_module_notify+0x1e1/0x2f0
     [<ffffffff8106e8f5>] notifier_call_chain+0x55/0x110
     [<ffffffff8106eb27>] __blocking_notifier_call_chain+0x67/0xc0
     [<ffffffff8106eb91>] blocking_notifier_call_chain+0x11/0x20
     [<ffffffff810af792>] load_module+0x19e2/0x24b0
     [<ffffffff810b0317>] SyS_init_module+0xb7/0xe0
     [<ffffffff814499d2>] system_call_fastpath+0x16/0x1b
     [<ffffffffffffffff>] 0xffffffffffffffff

These appear to be real leaks, but I am not familiar with this section of the 
code, and they could be false indications.

This mail is sent to all authors of patches incorporated in 
kernel/trace/trace_events.c in 2013. Kernel 3.9 did not show this problem.

Thanks,

Larry
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