linux-kernel - Re: Slab bug during skb allocation

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Date:   Thu, 10 Dec 2020 18:12:52 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Md Muazzam Husain <mdmuazzamhusain@...il.com>
Cc:     penberg@...nel.org, rientjes@...gle.com, iamjoonsoo.kim@....com,
        akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, mdakhil2003@...il.com
Subject: Re: Slab bug during skb allocation

On Thu, Dec 10, 2020 at 11:25:13PM +0530, Md Muazzam Husain wrote:
> Hi All,
>          I have kernel version 3.10.59. So during the allocation for skb i

That kernel is over 6 years old: https://lwn.net/Articles/618650/ It's
been out of support since November 2017.  The development kernel it was
based on is over 7 years old.  It's unreasonable to expect people to
know the answer to this.

Can you reproduce this problem with a recent kernel?

> am getting call trace for __netdev_alloc_skb which follows
> till cache_alloc_refill and finally crashes. Please find snapshot below.
> addr2line -e vmlinux ffffffffc114109c shows linux/mm/slab.c:2700 has the
> problem. Is there any existing bug and any patch for this.
> 
> Call Trace:
> [<ffffffffc114109c>] *cache_alloc_refill*+0x1b4/0x848
> [<ffffffffc1141854>] __kmalloc_track_caller+0x124/0x1f0
> [<ffffffffc144a930>] __kmalloc_reserve.isra.17+0x40/0xa8
> [<ffffffffc144b644>] __alloc_skb+0x84/0x1a0
> [<ffffffffc144d084>] *__netdev_alloc_skb*+0xdc/0x148
> [<ffffffffc13fb510>] xlpnae_irq+0x148/0x200
> [<ffffffffc10b87ac>] handle_irq_event_percpu+0x94/0x3f0
> [<ffffffffc10b8b5c>] handle_irq_event+0x54/0x98
> [<ffffffffc10bc724>] handle_level_irq+0xe4/0x170
> [<ffffffffc10b7d90>] generic_handle_irq+0x38/0x58
> [<ffffffffc1018a20>] do_IRQ+0x18/0x28
> [<ffffffffc1015ce8>] plat_irq_dispatch+0x258/0x490
> [<ffffffffc1016a00>] ret_from_irq+0x0/0x4
> [<ffffffffc1016ca0>] __r4k_wait+0x20/0x40
> [<ffffffffc109072c>] cpu_startup_entry+0xd4/0x2d8
> [<ffffffffc1014ab8>] prom_pre_boot_secondary_cpus+0x0/0x48
> 
> 
> Thanks,
> Muazzam