netdev - Re: [PATCH net] ionic: fix kernel panic in XDP

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Date: Mon, 3 Jun 2024 10:32:11 -0700
From: "Nelson, Shannon" <shannon.nelson@....com>
To: Taehee Yoo <ap420073@...il.com>, davem@...emloft.net, kuba@...nel.org,
 pabeni@...hat.com, edumazet@...gle.com, brett.creeley@....com,
 drivers@...sando.io, netdev@...r.kernel.org
Cc: jacob.e.keller@...el.com
Subject: Re: [PATCH net] ionic: fix kernel panic in XDP_TX action

On 6/2/2024 9:57 PM, Taehee Yoo wrote:
> 
> In the XDP_TX path, ionic driver sends a packet to the TX path with rx
> page and corresponding dma address.
> After tx is done, ionic_tx_clean() frees that page.
> But RX ring buffer isn't reset to NULL.
> So, it uses a freed page, which causes kernel panic.
> 
> BUG: unable to handle page fault for address: ffff8881576c110c
> PGD 773801067 P4D 773801067 PUD 87f086067 PMD 87efca067 PTE 800ffffea893e060
> Oops: Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC KASAN NOPTI
> CPU: 1 PID: 25 Comm: ksoftirqd/1 Not tainted 6.9.0+ #11
> Hardware name: ASUS System Product Name/PRIME Z690-P D4, BIOS 0603 11/01/2021
> RIP: 0010:bpf_prog_f0b8caeac1068a55_balancer_ingress+0x3b/0x44f
> Code: 00 53 41 55 41 56 41 57 b8 01 00 00 00 48 8b 5f 08 4c 8b 77 00 4c 89 f7 48 83 c7 0e 48 39 d8
> RSP: 0018:ffff888104e6fa28 EFLAGS: 00010283
> RAX: 0000000000000002 RBX: ffff8881576c1140 RCX: 0000000000000002
> RDX: ffffffffc0051f64 RSI: ffffc90002d33048 RDI: ffff8881576c110e
> RBP: ffff888104e6fa88 R08: 0000000000000000 R09: ffffed1027a04a23
> R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881b03a21a8
> R13: ffff8881589f800f R14: ffff8881576c1100 R15: 00000001576c1100
> FS: 0000000000000000(0000) GS:ffff88881ae00000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: ffff8881576c110c CR3: 0000000767a90000 CR4: 00000000007506f0
> PKRU: 55555554
> Call Trace:
> <TASK>
> ? __die+0x20/0x70
> ? page_fault_oops+0x254/0x790
> ? __pfx_page_fault_oops+0x10/0x10
> ? __pfx_is_prefetch.constprop.0+0x10/0x10
> ? search_bpf_extables+0x165/0x260
> ? fixup_exception+0x4a/0x970
> ? exc_page_fault+0xcb/0xe0
> ? asm_exc_page_fault+0x22/0x30
> ? 0xffffffffc0051f64
> ? bpf_prog_f0b8caeac1068a55_balancer_ingress+0x3b/0x44f
> ? do_raw_spin_unlock+0x54/0x220
> ionic_rx_service+0x11ab/0x3010 [ionic 9180c3001ab627d82bbc5f3ebe8a0decaf6bb864]
> ? ionic_tx_clean+0x29b/0xc60 [ionic 9180c3001ab627d82bbc5f3ebe8a0decaf6bb864]
> ? __pfx_ionic_tx_clean+0x10/0x10 [ionic 9180c3001ab627d82bbc5f3ebe8a0decaf6bb864]
> ? __pfx_ionic_rx_service+0x10/0x10 [ionic 9180c3001ab627d82bbc5f3ebe8a0decaf6bb864]
> ? ionic_tx_cq_service+0x25d/0xa00 [ionic 9180c3001ab627d82bbc5f3ebe8a0decaf6bb864]
> ? __pfx_ionic_rx_service+0x10/0x10 [ionic 9180c3001ab627d82bbc5f3ebe8a0decaf6bb864]
> ionic_cq_service+0x69/0x150 [ionic 9180c3001ab627d82bbc5f3ebe8a0decaf6bb864]
> ionic_txrx_napi+0x11a/0x540 [ionic 9180c3001ab627d82bbc5f3ebe8a0decaf6bb864]
> __napi_poll.constprop.0+0xa0/0x440
> net_rx_action+0x7e7/0xc30
> ? __pfx_net_rx_action+0x10/0x10
> 
> Fixes: 8eeed8373e1c ("ionic: Add XDP_TX support")
> Signed-off-by: Taehee Yoo <ap420073@...il.com>

Thanks,
Reviewed-by: Shannon Nelson <shannon.nelson@....com>

> ---
>   drivers/net/ethernet/pensando/ionic/ionic_txrx.c | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/net/ethernet/pensando/ionic/ionic_txrx.c b/drivers/net/ethernet/pensando/ionic/ionic_txrx.c
> index 5dba6d2d633c..2427610f4306 100644
> --- a/drivers/net/ethernet/pensando/ionic/ionic_txrx.c
> +++ b/drivers/net/ethernet/pensando/ionic/ionic_txrx.c
> @@ -586,6 +586,7 @@ static bool ionic_run_xdp(struct ionic_rx_stats *stats,
>                          netdev_dbg(netdev, "tx ionic_xdp_post_frame err %d\n", err);
>                          goto out_xdp_abort;
>                  }
> +               buf_info->page = NULL;
>                  stats->xdp_tx++;
> 
>                  /* the Tx completion will free the buffers */
> --
> 2.34.1
>