From: Larry Finger <Larry.Finger@lwfinger.net>
To: Alex Dubov <oakad@yahoo.com>
Cc: LKML <linux-kernel@vger.kernel.org>
Subject: 3.12-rc3 memory leak in module memstick
Date: Mon, 30 Sep 2013 12:51:28 -0500 [thread overview]
Message-ID: <5249BA20.1040402@lwfinger.net> (raw)
On 3.12-rc3, I detected a memory leak in module memstick. The kmemleak results
are listed below. The second output is after memstick was unloaded, which shows
that it is not a false positive from kmemleak.
larrylap:~ # echo scan > /sys/kernel/debug/kmemleak
larrylap:~ # cat /sys/kernel/debug/kmemleak
unreferenced object 0xffff8800ae85c190 (size 16):
comm "kworker/u4:3", pid 685, jiffies 4294916336 (age 2831.760s)
hex dump (first 16 bytes):
6d 65 6d 73 74 69 63 6b 30 00 00 00 00 00 00 00 memstick0.......
backtrace:
[<ffffffff8146a0d1>] kmemleak_alloc+0x21/0x50
[<ffffffff81160720>] __kmalloc_track_caller+0x160/0x2f0
[<ffffffff81237b9b>] kvasprintf+0x5b/0x90
[<ffffffff8122c0c1>] kobject_set_name_vargs+0x21/0x60
[<ffffffff812e7f5c>] dev_set_name+0x3c/0x40
[<ffffffffa02bf918>] memstick_check+0xb8/0x340 [memstick]
[<ffffffff81069862>] process_one_work+0x1d2/0x670
[<ffffffff8106a88a>] worker_thread+0x11a/0x370
[<ffffffff81072ea6>] kthread+0xd6/0xe0
[<ffffffff81478bbc>] ret_from_fork+0x7c/0xb0
[<ffffffffffffffff>] 0xffffffffffffffff
larrylap:~ # modprobe -rv r592
rmmod /lib/modules/3.12.0-rc3-wl+/kernel/drivers/memstick/host/r592.ko
rmmod /lib/modules/3.12.0-rc3-wl+/kernel/drivers/memstick/core/memstick.ko
larrylap:~ # echo scan > /sys/kernel/debug/kmemleak
larrylap:~ # cat /sys/kernel/debug/kmemleak
unreferenced object 0xffff8800ae85c190 (size 16):
comm "kworker/u4:3", pid 685, jiffies 4294916336 (age 2947.576s)
hex dump (first 16 bytes):
6d 65 6d 73 74 69 63 6b 30 00 00 00 00 00 00 00 memstick0.......
backtrace:
[<ffffffff8146a0d1>] kmemleak_alloc+0x21/0x50
[<ffffffff81160720>] __kmalloc_track_caller+0x160/0x2f0
[<ffffffff81237b9b>] kvasprintf+0x5b/0x90
[<ffffffff8122c0c1>] kobject_set_name_vargs+0x21/0x60
[<ffffffff812e7f5c>] dev_set_name+0x3c/0x40
[<ffffffffa02bf918>] 0xffffffffa02bf918
[<ffffffff81069862>] process_one_work+0x1d2/0x670
[<ffffffff8106a88a>] worker_thread+0x11a/0x370
[<ffffffff81072ea6>] kthread+0xd6/0xe0
[<ffffffff81478bbc>] ret_from_fork+0x7c/0xb0
[<ffffffffffffffff>] 0xffffffffffffffff
larrylap:~ #
As I have not had this driver enabled in my configuration for very long, I'm not
sure when this behavior started, but it is definitely present in 3.11.0.
Thanks,
Larry
next reply other threads:[~2013-09-30 17:51 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-30 17:51 Larry Finger [this message]
2013-10-01 14:04 ` 3.12-rc3 memory leak in module memstick Catalin Marinas
2013-10-01 17:03 ` Larry Finger
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