netdev - Re: [PATCH v7 bpf-next 0/9] introduce support for XDP programs in CPUMAP

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Message-ID: <20200717163111.GA633625@localhost.localdomain>
Date:   Fri, 17 Jul 2020 18:31:11 +0200
From:   Lorenzo Bianconi <lorenzo@...nel.org>
To:     Jakub Sitnicki <jakub@...udflare.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, ast@...nel.org,
        brouer@...hat.com, daniel@...earbox.net, toke@...hat.com,
        lorenzo.bianconi@...hat.com, dsahern@...nel.org,
        andrii.nakryiko@...il.com, bpf@...r.kernel.org
Subject: Re: [PATCH v7 bpf-next 0/9] introduce support for XDP programs in
 CPUMAP

> On Fri, 17 Jul 2020 13:01:36 +0200
> Lorenzo Bianconi <lorenzo@...nel.org> wrote:
> 
> > [...]
> > 

[...]

> Was able to trigger it running the newly added selftest:
> 
> virtme-init: console is ttyS0
> bash-5.0# ./test_progs -n 100
> #100/1 cpumap_with_progs:OK
> #100 xdp_cpumap_attach:OK
> Summary: 1/1 PASSED, 0 SKIPPED, 0 FAILED
> bash-5.0# [  247.177168] INFO: task cpumap/0/map:3:198 blocked for more than 122 seconds.
> [  247.181306]       Not tainted 5.8.0-rc4-01456-gbfdfa51702de #815
> [  247.184487] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
> [  247.188876] cpumap/0/map:3  D    0   198      2 0x00004000
> [  247.192624] Call Trace:
> [  247.194327]  __schedule+0x5ad/0xf10
> [  247.196860]  ? pci_mmcfg_check_reserved+0xd0/0xd0
> [  247.199853]  ? static_obj+0x31/0x80
> [  247.201917]  ? mark_held_locks+0x24/0x90
> [  247.204398]  ? cpu_map_update_elem+0x6d0/0x6d0
> [  247.207098]  schedule+0x6f/0x160
> [  247.209079]  schedule_preempt_disabled+0x14/0x20
> [  247.211863]  kthread+0x175/0x240
> [  247.213698]  ? kthread_create_on_node+0xd0/0xd0
> [  247.216054]  ret_from_fork+0x1f/0x30
> [  247.218363]
> [  247.218363] Showing all locks held in the system:
> [  247.222150] 1 lock held by khungtaskd/33:
> [  247.224894]  #0: ffffffff82d246a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x28/0x1c3
> [  247.231113]
> [  247.232335] =============================================
> [  247.232335]
> 
> qemu running with 4 vCPUs, 4 GB of memory. .config uploaded at
> https://paste.centos.org/view/0c14663d

ack, thx Jakub. I will look at it.

Regards,
Lorenzo

> 
> HTH,
> -jkbs

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