wireguard-dkms and CentOS 7.5

[Henry Snow]

Hmm...yeah, I've followed these steps:

Fresh CentOS 7.5 install
yum install git libmnl-devel elfutils-libelf-devel kernel-devel
@development-tools
git clone https://git.zx2c4.com/WireGuard
cd WireGuard/src
make
make install
deploy /etc/wireguard/wg0.conf
systemctl start wg-quick at wg0
kernel panic.

Any additional debugging steps I can provide? This trace looks a little
different, so also including it:

[ 1571.621740] ------------[ cut here ]------------
[ 1571.627195] WARNING: CPU: 1 PID: 264 at arch/x86/kernel/smp.c:127
native_smp_send_reschedule+0x65/0x70
[ 1571.637324] Modules linked in: wireguard(OE) ip6_udp_tunnel udp_tunnel
bonding skx_edac intel_powerclamp coretempd
[ 1571.715278] CPU: 1 PID: 264 Comm: kworker/1:2 Tainted: G      D    OE
------------   3.10.0-862.2.3.el7.x86_64 #1
[ 1571.726478] Hardware name: Dell Inc. PowerEdge R640/0W23H8, BIOS 1.3.7
02/08/2018
[ 1571.734820] Workqueue: wg-crypt-wg0 packet_rx_worker [wireguard]
[ 1571.741700] Call Trace:
[ 1571.744990]  <IRQ>  [<ffffffffa7d0d78e>] dump_stack+0x19/0x1b
[ 1571.751604]  [<ffffffffa76916d8>] __warn+0xd8/0x100
[ 1571.757319]  [<ffffffffa769181d>] warn_slowpath_null+0x1d/0x20
[ 1571.763975]  [<ffffffffa7654245>] native_smp_send_reschedule+0x65/0x70
[ 1571.771325]  [<ffffffffa76dd791>] trigger_load_balance+0x191/0x280
[ 1571.778320]  [<ffffffffa76d1f75>] ? sched_clock_cpu+0x85/0xc0
[ 1571.784883]  [<ffffffffa76cd41a>] scheduler_tick+0x10a/0x150
[ 1571.791355]  [<ffffffffa7701420>] ? tick_sched_do_timer+0x50/0x50
[ 1571.798254]  [<ffffffffa76a4825>] update_process_times+0x65/0x80
[ 1571.805063]  [<ffffffffa7701220>] tick_sched_handle+0x30/0x70
[ 1571.811608]  [<ffffffffa7701459>] tick_sched_timer+0x39/0x80
[ 1571.818060]  [<ffffffffa76beff6>] __hrtimer_run_queues+0xd6/0x260
[ 1571.824937]  [<ffffffffa76bf58f>] hrtimer_interrupt+0xaf/0x1d0
[ 1571.831549]  [<ffffffffa76577fb>] local_apic_timer_interrupt+0x3b/0x60
[ 1571.838863]  [<ffffffffa7d24063>] smp_apic_timer_interrupt+0x43/0x60
[ 1571.846003]  [<ffffffffa7d207b2>] apic_timer_interrupt+0x162/0x170
[ 1571.852973]  <EOI>  [<ffffffffa7d07b80>] ? panic+0x1d8/0x21f
[ 1571.859455]  [<ffffffffa7d17763>] oops_end+0xd3/0xe0
[ 1571.865223]  [<ffffffffa762e96b>] die+0x4b/0x70
[ 1571.870555]  [<ffffffffa7d16eb0>] do_trap+0x60/0x170
[ 1571.876314]  [<ffffffffa762b284>] do_invalid_op+0xb4/0x130
[ 1571.882591]  [<ffffffffa77f6bbc>] ? kfree+0x13c/0x140
[ 1571.888435]  [<ffffffffa76d3838>] ? __enqueue_entity+0x78/0x80
[ 1571.895059]  [<ffffffffa76da2fc>] ? enqueue_entity+0x26c/0xb60
[ 1571.901676]  [<ffffffffa795bb78>] ? prandom_u32+0x18/0x20
[ 1571.907858]  [<ffffffffa7bd60c5>] ? skb_release_data+0xf5/0x140
[ 1571.914561]  [<ffffffffa7d22aee>] invalid_op+0x1e/0x30
[ 1571.920479]  [<ffffffffa7bd60c5>] ? skb_release_data+0xf5/0x140
[ 1571.927164]  [<ffffffffa77f6bbc>] ? kfree+0x13c/0x140
[ 1571.932962]  [<ffffffffa7bd60c5>] skb_release_data+0xf5/0x140
[ 1571.939446]  [<ffffffffa7bd6134>] skb_release_all+0x24/0x30
[ 1571.945743]  [<ffffffffa7bd659c>] consume_skb+0x2c/0x90
[ 1571.951700]  [<ffffffffc08eff35>] packet_rx_worker+0x2d5/0x7f0
[wireguard]
[ 1571.959302]  [<ffffffffa76b2dff>] process_one_work+0x17f/0x440
[ 1571.965847]  [<ffffffffa76b3ac6>] worker_thread+0x126/0x3c0
[ 1571.972117]  [<ffffffffa76b39a0>] ? manage_workers.isra.24+0x2a0/0x2a0
[ 1571.979327]  [<ffffffffa76bae31>] kthread+0xd1/0xe0
[ 1571.984873]  [<ffffffffa76bad60>] ? insert_kthread_work+0x40/0x40
[ 1571.991611]  [<ffffffffa7d1f5dd>] ret_from_fork_nospec_begin+0x7/0x21
[ 1571.998687]  [<ffffffffa76bad60>] ? insert_kthread_work+0x40/0x40
[ 1572.005389] ---[ end trace 5ef54fbe37d13ebd ]---



On Thu, May 10, 2018 at 4:25 PM Jason A. Donenfeld <Jason at zx2c4.com> wrote:

> Hi Henry,
>
> Here's a transcript of things working fine with the latest master
> branch: https://א.cc/GEDdGn4N <https://xn--4db.cc/GEDdGn4N>
>
> I'm still playing to see if I can reproduce your crash.
>
> Jason
>
-- 
Henry Snow | Director, Site Reliability Engineering
eXelate, a Nielsen company <http://exelate.com/>
E: henry.snow at nielsen.com | M: 347.366.2700
675 6th Ave, 3rd Floor, New York, NY 10010
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