netdev - Re: [PATCH net] net/smc: Reset connection when trying to use SMCRv2 fails.

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Date: Fri, 19 May 2023 08:00:20 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Wen Gu <guwen@...ux.alibaba.com>
Cc: kgraul@...ux.ibm.com, wenjia@...ux.ibm.com, jaka@...ux.ibm.com,
 davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
 linux-s390@...r.kernel.org, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, liuyacan@...p.netease.com
Subject: Re: [PATCH net] net/smc: Reset connection when trying to use SMCRv2
 fails.

Hello:

This patch was applied to netdev/net.git (main)
by David S. Miller <davem@...emloft.net>:

On Thu, 18 May 2023 13:14:55 +0800 you wrote:
> We found a crash when using SMCRv2 with 2 Mellanox ConnectX-4. It
> can be reproduced by:
> 
> - smc_run nginx
> - smc_run wrk -t 32 -c 500 -d 30 http://<ip>:<port>
> 
>  BUG: kernel NULL pointer dereference, address: 0000000000000014
>  #PF: supervisor read access in kernel mode
>  #PF: error_code(0x0000) - not-present page
>  PGD 8000000108713067 P4D 8000000108713067 PUD 151127067 PMD 0
>  Oops: 0000 [#1] PREEMPT SMP PTI
>  CPU: 4 PID: 2441 Comm: kworker/4:249 Kdump: loaded Tainted: G        W   E      6.4.0-rc1+ #42
>  Workqueue: smc_hs_wq smc_listen_work [smc]
>  RIP: 0010:smc_clc_send_confirm_accept+0x284/0x580 [smc]
>  RSP: 0018:ffffb8294b2d7c78 EFLAGS: 00010a06
>  RAX: ffff8f1873238880 RBX: ffffb8294b2d7dc8 RCX: 0000000000000000
>  RDX: 00000000000000b4 RSI: 0000000000000001 RDI: 0000000000b40c00
>  RBP: ffffb8294b2d7db8 R08: ffff8f1815c5860c R09: 0000000000000000
>  R10: 0000000000000400 R11: 0000000000000000 R12: ffff8f1846f56180
>  R13: ffff8f1815c5860c R14: 0000000000000001 R15: 0000000000000001
>  FS:  0000000000000000(0000) GS:ffff8f1aefd00000(0000) knlGS:0000000000000000
>  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>  CR2: 0000000000000014 CR3: 00000001027a0001 CR4: 00000000003706e0
>  DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>  DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>  Call Trace:
>   <TASK>
>   ? mlx5_ib_map_mr_sg+0xa1/0xd0 [mlx5_ib]
>   ? smcr_buf_map_link+0x24b/0x290 [smc]
>   ? __smc_buf_create+0x4ee/0x9b0 [smc]
>   smc_clc_send_accept+0x4c/0xb0 [smc]
>   smc_listen_work+0x346/0x650 [smc]
>   ? __schedule+0x279/0x820
>   process_one_work+0x1e5/0x3f0
>   worker_thread+0x4d/0x2f0
>   ? __pfx_worker_thread+0x10/0x10
>   kthread+0xe5/0x120
>   ? __pfx_kthread+0x10/0x10
>   ret_from_fork+0x2c/0x50
>   </TASK>
> 
> [...]

Here is the summary with links:
  - [net] net/smc: Reset connection when trying to use SMCRv2 fails.
    https://git.kernel.org/netdev/net/c/35112271672a

You are awesome, thank you!
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