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SubjectPossible memory leaks in proc_sysctl.c
Hi Eric,

Following your commit f728019bb (sysctl: register only tables of sysctl
files), I get several kmemleak reports. They all seem to be header
allocations with kzalloc() in __register_sysctl_table() and
__register_sysctl_paths(). The patch isn't simple to quickly figure out
what may be wrong.

Tested on an ARM platform with 3.4-rc3.

unreferenced object 0xbf86c380 (size 128):
comm "swapper/0", pid 0, jiffies 4294937306 (age 69938.200s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 2c eb 4c 80 00 00 00 00 00 00 00 00 ....,.L.........
backtrace:
[<800be064>] create_object+0xe8/0x224
[<800bb120>] __kmalloc+0x118/0x19c
[<801116b8>] __register_sysctl_paths+0x128/0x1d0
[<8048a248>] sysctl_init+0xc/0x18
[<80483810>] start_kernel+0x310/0x32c
[<60008044>] 0x60008044
[<ffffffff>] 0xffffffff
unreferenced object 0xbf862380 (size 64):
comm "swapper/0", pid 0, jiffies 4294937306 (age 69938.200s)
hex dump (first 32 bytes):
84 bf 4e 80 00 00 00 00 01 00 00 00 01 00 00 00 ..N.............
00 00 00 00 00 00 00 00 28 31 4d 80 28 31 4d 80 ........(1M.(1M.
backtrace:
[<800be064>] create_object+0xe8/0x224
[<800bb120>] __kmalloc+0x118/0x19c
[<80110f5c>] __register_sysctl_table+0x4c/0x468
[<801114a4>] register_leaf_sysctl_tables+0x12c/0x200
[<8011151c>] register_leaf_sysctl_tables+0x1a4/0x200
[<801116e4>] __register_sysctl_paths+0x154/0x1d0
[<8048a248>] sysctl_init+0xc/0x18
[<80483810>] start_kernel+0x310/0x32c
[<60008044>] 0x60008044
[<ffffffff>] 0xffffffff
unreferenced object 0xbf8623c0 (size 64):
comm "swapper/0", pid 0, jiffies 4294937306 (age 69938.200s)
hex dump (first 32 bytes):
a8 bf 4e 80 00 00 00 00 01 00 00 00 01 00 00 00 ..N.............
00 00 00 00 00 00 00 00 28 31 4d 80 28 31 4d 80 ........(1M.(1M.
backtrace:
[<800be064>] create_object+0xe8/0x224
[<800bb120>] __kmalloc+0x118/0x19c
[<80110f5c>] __register_sysctl_table+0x4c/0x468
[<801114a4>] register_leaf_sysctl_tables+0x12c/0x200
[<8011151c>] register_leaf_sysctl_tables+0x1a4/0x200
[<801116e4>] __register_sysctl_paths+0x154/0x1d0
[<8048a248>] sysctl_init+0xc/0x18
[<80483810>] start_kernel+0x310/0x32c
[<60008044>] 0x60008044
[<ffffffff>] 0xffffffff
unreferenced object 0xbf973380 (size 64):
comm "swapper/0", pid 1, jiffies 4294937392 (age 69937.350s)
hex dump (first 32 bytes):
c0 06 50 80 00 00 00 00 01 00 00 00 01 00 00 00 ..P.............
00 00 00 00 c0 06 50 80 28 31 4d 80 28 31 4d 80 ......P.(1M.(1M.
backtrace:
[<800be064>] create_object+0xe8/0x224
[<800bb120>] __kmalloc+0x118/0x19c
[<80110f5c>] __register_sysctl_table+0x4c/0x468
[<80111754>] __register_sysctl_paths+0x1c4/0x1d0
[<8049aa54>] sysctl_core_init+0x1c/0x38
[<800086dc>] do_one_initcall+0x34/0x17c
[<804839a0>] kernel_init+0x174/0x21c
[<8000f978>] kernel_thread_exit+0x0/0x8
[<ffffffff>] 0xffffffff
unreferenced object 0xbfa27280 (size 64):
comm "swapper/0", pid 1, jiffies 4294937393 (age 69937.340s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 80 33 4e 80 00 00 00 00 00 00 00 00 .....3N.........
backtrace:
[<800be064>] create_object+0xe8/0x224
[<800bb120>] __kmalloc+0x118/0x19c
[<801116b8>] __register_sysctl_paths+0x128/0x1d0
[<8049c810>] inet_init+0xa8/0x28c
[<800086dc>] do_one_initcall+0x34/0x17c
[<804839a0>] kernel_init+0x174/0x21c
[<8000f978>] kernel_thread_exit+0x0/0x8
[<ffffffff>] 0xffffffff
unreferenced object 0xbfa27100 (size 64):
comm "swapper/0", pid 1, jiffies 4294937393 (age 69937.340s)
hex dump (first 32 bytes):
18 0d 50 80 00 00 00 00 01 00 00 00 01 00 00 00 ..P.............
00 00 00 00 00 00 00 00 28 31 4d 80 28 31 4d 80 ........(1M.(1M.
backtrace:
[<800be064>] create_object+0xe8/0x224
[<800bb120>] __kmalloc+0x118/0x19c
[<80110f5c>] __register_sysctl_table+0x4c/0x468
[<801114a4>] register_leaf_sysctl_tables+0x12c/0x200
[<8011151c>] register_leaf_sysctl_tables+0x1a4/0x200
[<801116e4>] __register_sysctl_paths+0x154/0x1d0
[<8049c810>] inet_init+0xa8/0x28c
[<800086dc>] do_one_initcall+0x34/0x17c
[<804839a0>] kernel_init+0x174/0x21c
[<8000f978>] kernel_thread_exit+0x0/0x8
[<ffffffff>] 0xffffffff


Thanks.

--
Catalin


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