linux-kernel - Re: [PATCH 1/3] iommu: match the original algorithm

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Date:   Wed, 27 Nov 2019 13:38:39 -0500
From:   Qian Cai <cai@....pw>
To:     John Garry <john.garry@...wei.com>
Cc:     Cong Wang <xiyou.wangcong@...il.com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] iommu: match the original algorithm



> On Nov 27, 2019, at 1:01 PM, John Garry <john.garry@...wei.com> wrote:
> 
> I haven't gone into the details, but this patch alone is giving this:
> 
> root@(none)$ [  123.857024] kmemleak: 8 new suspected memory leaks (see /sys/kernel/debug/kmemleak)
> 
> root@(none)$ cat /sys/kernel/debug/kmemleak
> unreferenced object 0xffff002339843000 (size 2048):
>  comm "swapper/0", pid 1, jiffies 4294898165 (age 122.688s)
>  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 00 00 00 00 00 00 00 00 00 00 00 00  ................
>  backtrace:
>    [<000000001d2710bf>] kmem_cache_alloc+0x188/0x260
>    [<00000000cc229a78>] init_iova_domain+0x1e8/0x2a8
>    [<000000002646fc92>] iommu_setup_dma_ops+0x200/0x710
>    [<00000000acc5fe46>] arch_setup_dma_ops+0x80/0x128
>    [<00000000994e1e43>] acpi_dma_configure+0x11c/0x140
>    [<00000000effe9374>] pci_dma_configure+0xe0/0x108
>    [<00000000f614ae1e>] really_probe+0x210/0x548
>    [<0000000087884b1b>] driver_probe_device+0x7c/0x148
>    [<0000000010af2936>] device_driver_attach+0x94/0xa0
>    [<00000000c92b2971>] __driver_attach+0xa4/0x110
>    [<00000000c873500f>] bus_for_each_dev+0xe8/0x158
>    [<00000000c7d0e008>] driver_attach+0x30/0x40
>    [<000000003cf39ba8>] bus_add_driver+0x234/0x2f0
>    [<0000000043830a45>] driver_register+0xbc/0x1d0
>    [<00000000c8a41162>] __pci_register_driver+0xb0/0xc8
>    [<00000000e562eeec>] sas_v3_pci_driver_init+0x20/0x28
> unreferenced object 0xffff002339844000 (size 2048):
>  comm "swapper/0", pid 1, jiffies 4294898165 (age 122.688s)
> 
> [snip]
> 
> And I don't feel like continuing until it's resolved....

Thanks for talking a hit by this before me. It is frustrating that people tend not to test their patches properly  with things like kmemleak.