netdev - Re: BUG_ON(sg->sg_magic != SG

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Message-ID: <20170811191551.GA44762@dhcp-172-26-121-1.dhcp.thefacebook.com>
Date:   Fri, 11 Aug 2017 12:15:51 -0700
From:   Dave Watson <davejwatson@...com>
To:     Dave Jones <davej@...emonkey.org.uk>,
        Ilya Lesokhin <ilyal@...lanox.com>,
        Aviad Yehezkel <aviadye@...lanox.com>
CC:     <netdev@...r.kernel.org>
Subject: Re: BUG_ON(sg->sg_magic != SG_MAGIC) on tls socket.

Hi Dave,

On 08/11/17 02:52 PM, Dave Jones wrote:
> kernel BUG at ./include/linux/scatterlist.h:189!
> invalid opcode: 0000 [#1] SMP KASAN

...

> Call Trace:
>  ? copy_page_to_iter+0x6c0/0x6c0
>  tls_sw_sendmsg+0x6d8/0x9c0
>  ? alloc_sg+0x510/0x510
>  ? cyc2ns_read_end+0x10/0x10
>  ? import_iovec+0xa8/0x1f0
>  ? do_syscall_64+0x1bc/0x3e0
>  ? entry_SYSCALL64_slow_path+0x25/0x25
>  inet_sendmsg+0xce/0x310

...

> 186 static inline void sg_mark_end(struct scatterlist *sg)
> 187 {
> 188 #ifdef CONFIG_DEBUG_SG
> 189         BUG_ON(sg->sg_magic != SG_MAGIC);
> 190 #endif

+added mellanox folks

I haven't seen this one yet.  The specific sequence of
sendmsg/sendpage calls would probably be super helpful to nail it down

Thanks