Messages in this thread Patch in this message | | | From | (Eric W. Biederman) | Date | Wed, 18 Apr 2012 06:22:09 -0700 | Subject | Re: Possible memory leaks in proc_sysctl.c |
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Catalin Marinas <catalin.marinas@arm.com> writes:
> 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.
Due to a change in the data structure places where we register the sysctl permanently and ignore the result from the register_sysctl_... family of functions now report this leak.
majianpeng has done a good of getting kmemleak_not_leak annotations into the net tree, and I have one of his patches pending to put into my sysctl tree (see below).
I don't know if the issue is serious enough to warrant putting the changes into 3.4 but the patches are trivial.
The pending patch for kernel/sysctl.c
Eric
From 349f2cf150ba9aabdcc24c174f7dab09d3da4508 Mon Sep 17 00:00:00 2001 From: majianpeng <majianpeng@gmail.com> Date: Tue, 17 Apr 2012 13:45:52 +0800 Subject: [PATCH] sysctl:Remove memleak reports by kmemeleak_not_leak
Signed-off-by: majianpeng <majianpeng@gmail.com> --- kernel/sysctl.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 4ab1187..136ac3b 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -1551,7 +1551,7 @@ static struct ctl_table dev_table[] = { int __init sysctl_init(void) { - register_sysctl_table(sysctl_base_table); + kmemleak_not_leak(register_sysctl_table(sysctl_base_table)); return 0; }
> 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.
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