netdev - Re: [PATCH net v2 1/2] gianfar: Replace skb_realloc_headroom with skb_cow

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Message-ID: <20201103083050.100b2568@kicinski-fedora-PC1C0HJN.hsd1.ca.comcast.net>
Date:   Tue, 3 Nov 2020 08:30:50 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Vladimir Oltean <olteanv@...il.com>
Cc:     Claudiu Manoil <claudiu.manoil@....com>, netdev@...r.kernel.org,
        "David S . Miller" <davem@...emloft.net>, james.jurack@...tek.com
Subject: Re: [PATCH net v2 1/2] gianfar: Replace skb_realloc_headroom with
 skb_cow_head for PTP

On Tue, 3 Nov 2020 18:13:19 +0200 Vladimir Oltean wrote:
> [14538.046926] PC is at skb_release_data+0x6c/0x14c
> [14538.051518] LR is at consume_skb+0x38/0xd8
> [14538.055588] pc : [<c10e439c>]    lr : [<c10e3fac>]    psr: 200f0013
> [14538.061817] sp : c28f1da8  ip : 00000000  fp : c265aa40
> [14538.067010] r10: 00000000  r9 : 00000000  r8 : c2f98000
> [14538.072204] r7 : c511d900  r6 : c3d3d900  r5 : c3d3d900  r4 : 00000000
> [14538.078693] r3 : 000000d3  r2 : 00000001  r1 : 00000000  r0 : 00000000

> [14538.263039] [<c10e439c>] (skb_release_data) from [<c10e3fac>] (consume_skb+0x38/0xd8)
> [14538.270834] [<c10e3fac>] (consume_skb) from [<c0d529bc>] (gfar_start_xmit+0x704/0x784)
> [14538.278714] [<c0d529bc>] (gfar_start_xmit) from [<c10fcdf8>] (dev_hard_start_xmit+0xfc/0x254)
> [14538.287198] [<c10fcdf8>] (dev_hard_start_xmit) from [<c1158524>] (sch_direct_xmit+0x104/0x2e0)

Looks like one of the error paths freeing a wonky skb.

Could you decode these addresses to line numbers?