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Date: Tue, 8 Mar 2016 10:52:10 -0500
From: Joshua Hunt <johunt@...mai.com>
To: gong.chen@...el.com, linux-acpi@...r.kernel.org, rjw@...ysocki.net,
lenb@...nel.org, ying.huang@...el.com
Cc: tony.luck@...el.com, linux-kernel@...r.kernel.org,
Joshua Hunt <johunt@...mai.com>
Subject: [PATCH v2 0/2] ACPI, APEI: Memory leaks
While investigating a possible memory leak using kmemleak I came across the
following five leaks coming from APEI and ERST:
unreferenced object 0xffff880402b6ee80 (size 32):
comm "swapper/0", pid 1, jiffies 4294669373 (age 318.183s)
hex dump (first 32 bytes):
58 fe ab fa 03 88 ff ff 58 fe ab fa 03 88 ff ff X.......X.......
18 50 ea dc 00 00 00 00 3f 50 ea dc 00 00 00 00 .P......?P......
backtrace:
[<ffffffff82195c33>] create_object+0x103/0x2c0
[<ffffffff826868b2>] kmemleak_alloc+0x82/0xc0
[<ffffffff8218248b>] kmem_cache_alloc_trace+0x17b/0x210
[<ffffffff8241a6fa>] apei_res_add+0x19a/0x200
[<ffffffff8241a7e2>] collect_res_callback+0x82/0xa0
[<ffffffff8241a225>] apei_exec_for_each_entry+0x85/0xb0
[<ffffffff8241a26a>] apei_exec_collect_resources+0x1a/0x20
[<ffffffff82afe532>] erst_init+0x3d6/0x3e5
[<ffffffff820004bd>] do_one_initcall+0x19d/0x1d0
[<ffffffff82ac1152>] kernel_init_freeable+0x13d/0x1d6
[<ffffffff82684a8e>] kernel_init+0xe/0xf0
[<ffffffff826909d2>] ret_from_fork+0x42/0x70
[<ffffffffffffffff>] 0xffffffffffffffff
unreferenced object 0xffff880402b6ee40 (size 32):
comm "swapper/0", pid 1, jiffies 4294670231 (age 317.326s)
hex dump (first 32 bytes):
68 fe ab fa 03 88 ff ff 68 fe ab fa 03 88 ff ff h.......h.......
b2 00 00 00 00 00 00 00 b3 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffff82195c33>] create_object+0x103/0x2c0
[<ffffffff826868b2>] kmemleak_alloc+0x82/0xc0
[<ffffffff8218248b>] kmem_cache_alloc_trace+0x17b/0x210
[<ffffffff8241a6fa>] apei_res_add+0x19a/0x200
[<ffffffff8241a7fc>] collect_res_callback+0x9c/0xa0
[<ffffffff8241a225>] apei_exec_for_each_entry+0x85/0xb0
[<ffffffff8241a26a>] apei_exec_collect_resources+0x1a/0x20
[<ffffffff82afe532>] erst_init+0x3d6/0x3e5
[<ffffffff820004bd>] do_one_initcall+0x19d/0x1d0
[<ffffffff82ac1152>] kernel_init_freeable+0x13d/0x1d6
[<ffffffff82684a8e>] kernel_init+0xe/0xf0
[<ffffffff826909d2>] ret_from_fork+0x42/0x70
[<ffffffffffffffff>] 0xffffffffffffffff
unreferenced object 0xffff880402b6ee20 (size 32):
comm "swapper/0", pid 1, jiffies 4294672240 (age 315.317s)
hex dump (first 32 bytes):
88 fd ab fa 03 88 ff ff 00 ee b6 02 04 88 ff ff ................
00 d0 15 cd 00 00 00 00 00 40 16 cd 00 00 00 00 .........@......
backtrace:
[<ffffffff82195c33>] create_object+0x103/0x2c0
[<ffffffff826868b2>] kmemleak_alloc+0x82/0xc0
[<ffffffff8218248b>] kmem_cache_alloc_trace+0x17b/0x210
[<ffffffff8241a6fa>] apei_res_add+0x19a/0x200
[<ffffffff8241a81a>] apei_get_res_callback+0x1a/0x20
[<ffffffff823d0f8b>] acpi_nvs_for_each_region+0x2b/0x50
[<ffffffff8241ae95>] apei_resources_request+0x95/0x380
[<ffffffff82afe23e>] erst_init+0xe2/0x3e5
[<ffffffff820004bd>] do_one_initcall+0x19d/0x1d0
[<ffffffff82ac1152>] kernel_init_freeable+0x13d/0x1d6
[<ffffffff82684a8e>] kernel_init+0xe/0xf0
[<ffffffff826909d2>] ret_from_fork+0x42/0x70
[<ffffffffffffffff>] 0xffffffffffffffff
unreferenced object 0xffff880402b6ee00 (size 32):
comm "swapper/0", pid 1, jiffies 4294672400 (age 315.157s)
hex dump (first 32 bytes):
20 ee b6 02 04 88 ff ff 88 fd ab fa 03 88 ff ff ...............
00 80 f3 dc 00 00 00 00 00 60 a9 dd 00 00 00 00 .........`......
backtrace:
[<ffffffff82195c33>] create_object+0x103/0x2c0
[<ffffffff826868b2>] kmemleak_alloc+0x82/0xc0
[<ffffffff8218248b>] kmem_cache_alloc_trace+0x17b/0x210
[<ffffffff8241a6fa>] apei_res_add+0x19a/0x200
[<ffffffff8241a81a>] apei_get_res_callback+0x1a/0x20
[<ffffffff823d0f8b>] acpi_nvs_for_each_region+0x2b/0x50
[<ffffffff8241ae95>] apei_resources_request+0x95/0x380
[<ffffffff82afe23e>] erst_init+0xe2/0x3e5
[<ffffffff820004bd>] do_one_initcall+0x19d/0x1d0
[<ffffffff82ac1152>] kernel_init_freeable+0x13d/0x1d6
[<ffffffff82684a8e>] kernel_init+0xe/0xf0
[<ffffffff826909d2>] ret_from_fork+0x42/0x70
[<ffffffffffffffff>] 0xffffffffffffffff
unreferenced object 0xffff880402b6ede0 (size 32):
comm "swapper/0", pid 1, jiffies 4294672863 (age 314.698s)
hex dump (first 32 bytes):
a8 fd ab fa 03 88 ff ff a8 fd ab fa 03 88 ff ff ................
00 00 00 f8 00 00 00 00 00 00 00 fc 00 00 00 00 ................
backtrace:
[<ffffffff82195c33>] create_object+0x103/0x2c0
[<ffffffff826868b2>] kmemleak_alloc+0x82/0xc0
[<ffffffff8218248b>] kmem_cache_alloc_trace+0x17b/0x210
[<ffffffff8241a6fa>] apei_res_add+0x19a/0x200
[<ffffffff8241a81a>] apei_get_res_callback+0x1a/0x20
[<ffffffff82582d61>] pci_mmcfg_for_each_region+0x51/0x60
[<ffffffff8241b14a>] apei_resources_request+0x34a/0x380
[<ffffffff82afe23e>] erst_init+0xe2/0x3e5
[<ffffffff820004bd>] do_one_initcall+0x19d/0x1d0
[<ffffffff82ac1152>] kernel_init_freeable+0x13d/0x1d6
[<ffffffff82684a8e>] kernel_init+0xe/0xf0
[<ffffffff826909d2>] ret_from_fork+0x42/0x70
[<ffffffffffffffff>] 0xffffffffffffffff
The issue has been reported a handful of times upstream. Here is one of the previous
reports: https://lkml.org/lkml/2013/8/11/149
This series resolves the reported leaks and kmemleak is clean with these patches applied.
Changes from v1 as per Gong Chen's comments:
* Use existing apei_resources_fini calls to do the cleanup
* Update changelog in erst_init patch
Joshua Hunt (2):
ACPI, APEI: Fix leaked resources
ACPI, APEI, ERST: Fixed leaked resources in erst_init
drivers/acpi/apei/apei-base.c | 6 ++++--
drivers/acpi/apei/erst.c | 3 +++
2 files changed, 7 insertions(+), 2 deletions(-)
--
1.7.9.5
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