linux-kernel - Re: [RT PATCH v2] net/xfrm/xfrm_ipcomp: Protect scratch buffer with local

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Date:   Mon, 19 Aug 2019 15:57:21 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Juri Lelli <juri.lelli@...hat.com>
Cc:     tglx@...utronix.de, bigeasy@...utronix.de,
        linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        williams@...hat.com
Subject: Re: [RT PATCH v2] net/xfrm/xfrm_ipcomp: Protect scratch buffer with
 local_lock

On Mon, 19 Aug 2019 14:27:31 +0200
Juri Lelli <juri.lelli@...hat.com> wrote:

> The following BUG has been reported while running ipsec tests.

Thanks!

I'm still in the process of backporting patches to fix some bugs that
showed up with the latest merge of upstream stable. I'll add this to
the queue to add.

-- Steve


> 
>  BUG: scheduling while atomic: irq/78-eno3-rx-/12023/0x00000002
>  Modules linked in: ipcomp xfrm_ipcomp ...
>  Preemption disabled at:
>  [<ffffffffc0b29730>] ipcomp_input+0xd0/0x9a0 [xfrm_ipcomp]
>  CPU: 1 PID: 12023 Comm: irq/78-eno3-rx- Kdump: loaded Not tainted [...] #1
>  Hardware name: [...]
>  Call Trace:
>   dump_stack+0x5c/0x80
>   ? ipcomp_input+0xd0/0x9a0 [xfrm_ipcomp]
>   __schedule_bug.cold.81+0x44/0x51
>   __schedule+0x5bf/0x6a0
>   schedule+0x39/0xd0
>   rt_spin_lock_slowlock_locked+0x10e/0x2b0
>   rt_spin_lock_slowlock+0x50/0x80
>   get_page_from_freelist+0x609/0x1560
>   ? zlib_updatewindow+0x5a/0xd0
>   __alloc_pages_nodemask+0xd9/0x280
>   ipcomp_input+0x299/0x9a0 [xfrm_ipcomp]
>   xfrm_input+0x5e3/0x960
>   xfrm4_ipcomp_rcv+0x34/0x50
>   ip_local_deliver_finish+0x22d/0x250
>   ip_local_deliver+0x6d/0x110
>   ? ip_rcv_finish+0xac/0x480
>   ip_rcv+0x28e/0x3f9
>   ? packet_rcv+0x43/0x4c0
>   __netif_receive_skb_core+0xb7c/0xd10
>   ? inet_gro_receive+0x8e/0x2f0
>   netif_receive_skb_internal+0x4a/0x160
>   napi_gro_receive+0xee/0x110
>   tg3_rx+0x2a8/0x810 [tg3]
>   tg3_poll_work+0x3b3/0x830 [tg3]
>   tg3_poll_msix+0x3b/0x170 [tg3]
>   net_rx_action+0x1ff/0x470
>   ? __switch_to_asm+0x41/0x70
>   do_current_softirqs+0x223/0x3e0
>   ? irq_thread_check_affinity+0x20/0x20
>   __local_bh_enable+0x51/0x60
>   irq_forced_thread_fn+0x5e/0x80
>   ? irq_finalize_oneshot.part.45+0xf0/0xf0
>   irq_thread+0x13d/0x1a0
>   ? wake_threads_waitq+0x30/0x30
>   kthread+0x112/0x130
>   ? kthread_create_worker_on_cpu+0x70/0x70
>   ret_from_fork+0x35/0x40
>