We are seeing a repeatable kernel oops (quite a deadly one) when destroying
containers which are or have been passing forwarded IPv4 traffic and have
(or have had) a netfilter conntrack rule installed.
To repeat, you need to have
a) a container
b) which is forwarding IPv4 traffic from one interface in the container to
another (2 veth interfaces in this case) - one ping packet per second
will do
c) iptables with an IP conntrack rule.
d) delete the container (it doesn't matter if you delete the iptables
rule first and sleep for a couple of seconds).
An OOPS like the one below results.
This one is from Ubuntu kernel
3.0.0-10-server #16-Ubuntu SMP Fri Sep 2 18:51:05 UTC 2011 x86_64 GNU/Linux
which I believe is (confusingly) 3.0.4 stable, however we have also seen
this on 2.6.38-10-server.
--
Alex Bligh
root@node-10-157-128-100:~# uname -a
Linux node-10-157-128-100 3.0.0-10-server #16-Ubuntu SMP Fri Sep 2 18:51:05
UTC 2011 x86_64 GNU/Linux
Sep 9 14:30:56 node-10-157-128-100 kernel: [79418.880263] IN=evrr-000000
OUT= MAC=33:33:00:00:00:01:00:15:17:a6:cd:49:86:dd
SRC=fe80:0000:0000:0000:0215:17ff:fea6:cd
49 DST=ff02:0000:0000:0000:0000:0000:0000:0001 LEN=72 TC=0 HOPLIMIT=1
FLOWLBL=0 PROTO=ICMPv6 TYPE=130 CODE=0
Sep 9 14:30:56 node-10-157-128-100 kernel: [79418.880332] IN=evrr-000008
OUT= MAC=33:33:00:00:00:01:0e:f1:9d:53:b5:1e:86:dd
SRC=fe80:0000:0000:0000:58e8:01ff:fe0b:0d
b2 DST=ff02:0000:0000:0000:0000:0000:0000:0001 LEN=72 TC=0 HOPLIMIT=1
FLOWLBL=0 PROTO=ICMPv6 TYPE=130 CODE=0
Sep 9 14:33:01 node-10-157-128-100 kernel: [79544.160335] IN=evrr-000000
OUT= MAC=33:33:00:00:00:01:00:15:17:a6:cd:49:86:dd
SRC=fe80:0000:0000:0000:0215:17ff:fea6:cd
49 DST=ff02:0000:0000:0000:0000:0000:0000:0001 LEN=72 TC=0 HOPLIMIT=1
FLOWLBL=0 PROTO=ICMPv6 TYPE=130 CODE=0
Sep 9 14:33:01 node-10-157-128-100 kernel: [79544.160417] IN=evrr-000008
OUT= MAC=33:33:00:00:00:01:0e:f1:9d:53:b5:1e:86:dd
SRC=fe80:0000:0000:0000:58e8:01ff:fe0b:0d
b2 DST=ff02:0000:0000:0000:0000:0000:0000:0001 LEN=72 TC=0 HOPLIMIT=1
FLOWLBL=0 PROTO=ICMPv6 TYPE=130 CODE=0
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.780106] BUG: unable to
handle kernel NULL pointer dereference at 0000000000000274
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.780274] IP:
[<ffffffff81511959>] netlink_has_listeners+0x9/0x50
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.780398] PGD 0
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.780441] Oops: 0000 [#1]
SMP
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.780515] CPU 7
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.780547] Modules linked
in: ipt_REJECT nf_conntrack_netlink nfnetlink dm_round_robin dm_multipath
veth ip6t_LOG nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables
ipt_LOG xt_limit xt_state xt_tcpudp iptable_filter ipt_MASQUERADE
iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4
iptable_mangle ip_tables ebt_ip ebtable_filter ebtables x_tables ib_iser
rdma_cm ib_cm iw_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp
libiscsi scsi_transport_iscsi bonding usb_storage uas joydev usbhid hid
radeon ttm ses enclosure drm_kms_helper drm kvm_amd psmouse kvm
amd64_edac_mod dcdbas serio_raw e1000e megaraid_sas edac_core i2c_algo_bit
k8temp edac_mce_amd pata_serverworks shpchp i2c_piix4 bridge 8021q garp stp
ixgbe dca mdio [last unloaded: multipath]
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.786143]
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.790033] Pid: 25711,
comm: kworker/u:2 Not tainted 3.0.0-10-server #16-Ubuntu Dell Inc.
PowerEdge 6950/0GK775
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.790033] RIP:
0010:[<ffffffff81511959>] [<ffffffff81511959>]
netlink_has_listeners+0x9/0x50
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.790033] RSP:
0018:ffff880801109c00 EFLAGS: 00010246
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.790033] RAX:
0000000000000004 RBX: ffff880c0f796af8 RCX: 000000000000ffff
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.790033] RDX:
ffff8803f1700000 RSI: 0000000000000003 RDI: 0000000000000000
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.790033] RBP:
ffff880801109c00 R08: ffff880801108000 R09: 0000000000000000
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.790033] R10:
0000000000000001 R11: dead000000200200 R12: ffff880801109cb0
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.790033] R13:
ffff880c0f796af8 R14: ffff880c0f796af8 R15: 0000000000000004
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.790033] FS:
00007fe2d2d57710(0000) GS:ffff881027d00000(0000) knlGS:0000000000000000
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.790033] CS: 0010 DS:
0000 ES: 0000 CR0: 000000008005003b
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.790033] CR2:
0000000000000274 CR3: 0000000001c03000 CR4: 00000000000006e0
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.790033] DR0:
0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.790033] DR3:
0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.790033] Process
kworker/u:2 (pid: 25711, threadinfo ffff880801108000, task ffff88080f5f9720)
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.790033]
ffff880801109c10 ffffffffa048f145 ffff880801109c90 ffffffffa049943b
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.790033]
ffff880801109c70 7fffffffffffffff ffff8803f1700000 0000000300000004
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.790033]
ffff880800000000 ffffffff00000002 ffff880c0fc80000 ffff880c0f796b98
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.790033] Call Trace:
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.790033]
[<ffffffffa048f145>] nfnetlink_has_listeners+0x15/0x20 [nfnetlink]
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.790033]
[<ffffffffa049943b>] ctnetlink_conntrack_event+0x5cb/0x890
[nf_conntrack_netlink]
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.790033]
[<ffffffff814e34d0>] ? net_drop_ns+0x50/0x50
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.790033]
[<ffffffffa04062d8>] death_by_timeout+0xc8/0x1c0 [nf_conntrack]
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.790033]
[<ffffffffa0405270>] ? nf_conntrack_attach+0x50/0x50 [nf_conntrack]
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.790033]
[<ffffffffa0406448>] nf_ct_iterate_cleanup+0x78/0x90 [nf_conntrack]
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.790033]
[<ffffffffa0406491>] nf_conntrack_cleanup_net+0x31/0x100 [nf_conntrack]
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.790033]
[<ffffffffa0407f97>] nf_conntrack_cleanup+0x27/0x60 [nf_conntrack]
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.790033]
[<ffffffffa04081f0>] nf_conntrack_net_exit+0x60/0x80 [nf_conntrack]
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.790033]
[<ffffffff814e2d28>] ops_exit_list.isra.1+0x38/0x60
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.790033]
[<ffffffff814e35e2>] cleanup_net+0x112/0x1b0
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.790033]
[<ffffffff8107bb0a>] process_one_work+0x11a/0x480
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.790033]
[<ffffffff8107c7d5>] worker_thread+0x165/0x370
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.790033]
[<ffffffff8107c670>] ? manage_workers.isra.30+0x130/0x130
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.790033]
[<ffffffff81080c1c>] kthread+0x8c/0xa0
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.950699]
[<ffffffff81607c24>] kernel_thread_helper+0x4/0x10
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.950699]
[<ffffffff81080b90>] ? flush_kthread_worker+0xa0/0xa0
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.950699]
[<ffffffff81607c20>] ? gs_change+0x13/0x13
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.950699] Code: 00 00 48
85 f6 74 0c 48 83 ee 01 48 89 df e8 cf f6 ff ff 48 8b 5d f0 4c 8b 65 f8 c9
c3 0f 1f 44 00 00 55 48 89 e5 66 66 66 66 90 <f6> 87 74 02 00 00 01 74 30
0f b6 87 21 01 00 00 4c 8b 05 38 8d
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.950699] RIP
[<ffffffff81511959>] netlink_has_listeners+0x9/0x50
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.950699] RSP
<ffff880801109c00>
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.950699] CR2:
0000000000000274
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.954892] ---[ end trace
73540474560834fd ]---
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.954941] BUG: unable to
handle kernel paging request at fffffffffffffff8
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.954945] IP:
[<ffffffff810810b1>] kthread_data+0x11/0x20
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.954950] PGD 1c05067 PUD
1c06067 PMD 0
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.954954] Oops: 0000 [#2]
SMP
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.954957] CPU 7
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.954959] Modules linked
in: ipt_REJECT nf_conntrack_netlink nfnetlink dm_round_robin dm_multipath
veth ip6t_LOG nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables
ipt_LOG xt_limit xt_state xt_tcpudp iptable_filter ipt_MASQUERADE
iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack nf_defrag_ipv4
iptable_mangle ip_tables ebt_ip ebtable_filter ebtables x_tables ib_iser
rdma_cm ib_cm iw_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp libiscsi_tcp
libiscsi scsi_transport_iscsi bonding usb_storage uas joydev usbhid hid
radeon ttm ses enclosure drm_kms_helper drm kvm_amd psmouse kvm
amd64_edac_mod dcdbas serio_raw e1000e megaraid_sas edac_core i2c_algo_bit
k8temp edac_mce_amd pata_serverworks shpchp i2c_piix4 bridge 8021q garp stp
ixgbe dca mdio [last unloaded: multipath]
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955032]
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955034] Pid: 25711,
comm: kworker/u:2 Tainted: G D 3.0.0-10-server #16-Ubuntu Dell
Inc. PowerEdge 6950/0GK775
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955040] RIP:
0010:[<ffffffff810810b1>] [<ffffffff810810b1>] kthread_data+0x11/0x20
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955046] RSP:
0018:ffff880801109870 EFLAGS: 00010096
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955048] RAX:
0000000000000000 RBX: 0000000000000007 RCX: 0000000000000007
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955051] RDX:
0000000000000007 RSI: 0000000000000007 RDI: ffff88080f5f9720
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955054] RBP:
ffff880801109888 R08: 0000000000989680 R09: 0000000000000001
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955057] R10:
0000000000000400 R11: ffff88080f65c118 R12: 0000000000000007
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955060] R13:
ffff88080f5f9ae8 R14: 0000000000000000 R15: 0000000000000246
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955064] FS:
00007fe2d2d57710(0000) GS:ffff881027d00000(0000) knlGS:0000000000000000
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955067] CS: 0010 DS:
0000 ES: 0000 CR0: 000000008005003b
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955070] CR2:
fffffffffffffff8 CR3: 0000000001c03000 CR4: 00000000000006e0
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955073] DR0:
0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955076] DR3:
0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955079] Process
kworker/u:2 (pid: 25711, threadinfo ffff880801108000, task ffff88080f5f9720)
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955082] Stack:
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955083]
ffffffff8107cd25 ffff880801109888 ffff881027d12a40 ffff880801109908
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955089]
ffffffff815fc737 ffff88080f5f9720 0000000000000000 ffff880801109fd8
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955094]
ffff880801109fd8 ffff880801109fd8 0000000000012a40 0000000000000011
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955100] Call Trace:
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955103]
[<ffffffff8107cd25>] ? wq_worker_sleeping+0x15/0xa0
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955108]
[<ffffffff815fc737>] schedule+0x637/0x770
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955114]
[<ffffffff81063053>] do_exit+0x273/0x440
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955119]
[<ffffffff815ffbd0>] oops_end+0xb0/0xf0
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955124]
[<ffffffff815e7104>] no_context+0x145/0x152
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955128]
[<ffffffff815e729f>] __bad_area_nosemaphore+0x18e/0x1b1
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955133]
[<ffffffff815e72d5>] bad_area_nosemaphore+0x13/0x15
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955138]
[<ffffffff816024fd>] do_page_fault+0x43d/0x530
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955144]
[<ffffffff8100969a>] ? __switch_to+0xca/0x310
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955148]
[<ffffffff815fe73e>] ? _raw_spin_lock+0xe/0x20
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955154]
[<ffffffff8104e749>] ? finish_task_switch+0x49/0xf0
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955158]
[<ffffffff815fef15>] page_fault+0x25/0x30
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955162]
[<ffffffff81511959>] ? netlink_has_listeners+0x9/0x50
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955167]
[<ffffffffa048f145>] nfnetlink_has_listeners+0x15/0x20 [nfnetlink]
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955172]
[<ffffffffa049943b>] ctnetlink_conntrack_event+0x5cb/0x890
[nf_conntrack_netlink]
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955177]
[<ffffffff814e34d0>] ? net_drop_ns+0x50/0x50
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955183]
[<ffffffffa04062d8>] death_by_timeout+0xc8/0x1c0 [nf_conntrack]
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955189]
[<ffffffffa0405270>] ? nf_conntrack_attach+0x50/0x50 [nf_conntrack]
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955195]
[<ffffffffa0406448>] nf_ct_iterate_cleanup+0x78/0x90 [nf_conntrack]
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955202]
[<ffffffffa0406491>] nf_conntrack_cleanup_net+0x31/0x100 [nf_conntrack]
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955209]
[<ffffffffa0407f97>] nf_conntrack_cleanup+0x27/0x60 [nf_conntrack]
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955215]
[<ffffffffa04081f0>] nf_conntrack_net_exit+0x60/0x80 [nf_conntrack]
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955220]
[<ffffffff814e2d28>] ops_exit_list.isra.1+0x38/0x60
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955224]
[<ffffffff814e35e2>] cleanup_net+0x112/0x1b0
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955229]
[<ffffffff8107bb0a>] process_one_work+0x11a/0x480
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955233]
[<ffffffff8107c7d5>] worker_thread+0x165/0x370
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955237]
[<ffffffff8107c670>] ? manage_workers.isra.30+0x130/0x130
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955241]
[<ffffffff81080c1c>] kthread+0x8c/0xa0
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955245]
[<ffffffff81607c24>] kernel_thread_helper+0x4/0x10
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955250]
[<ffffffff81080b90>] ? flush_kthread_worker+0xa0/0xa0
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955254]
[<ffffffff81607c20>] ? gs_change+0x13/0x13
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955256] Code: 41 5f 5d
c3 be 3e 01 00 00 48 c7 c7 88 90 9e 81 e8 b5 d7 fd ff e9 74 fe ff ff 55 48
89 e5 66 66 66 66 90 48 8b 87 70 03 00 00 5d
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955311] RIP
[<ffffffff810810b1>] kthread_data+0x11/0x20
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955315] RSP
<ffff880801109870>
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955317] CR2:
fffffffffffffff8
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955319] ---[ end trace
73540474560834fe ]---
Sep 9 14:34:00 node-10-157-128-100 kernel: [79602.955322] Fixing recursive
fault but reboot is needed!
Sep 9 14:35:00 node-10-157-128-100 kernel: [79663.120046] INFO:
rcu_sched_state detected stalls on CPUs/tasks: { 1 7} (detected by 6,
t=6002 jiffies)
Sep 9 14:35:05 node-10-157-128-100 kernel: [79667.970047] INFO:
rcu_bh_state detected stalls on CPUs/tasks: { 1 7} (detected by 6, t=6002
jiffies)
Sep 9 14:38:00 node-10-157-128-100 kernel: [79843.440048] INFO:
rcu_sched_state detected stalls on CPUs/tasks: { 1 7} (detected by 6,
t=24034 jiffies)
Sep 9 14:38:05 node-10-157-128-100 kernel: [79848.290046] INFO:
rcu_bh_state detected stalls on CPUs/tasks: { 1 7} (detected by 6, t=24034
jiffies)
Sep 9 14:41:00 node-10-157-128-100 kernel: [80023.760051] INFO:
rcu_sched_state detected stalls on CPUs/tasks: { 1 7} (detected by 6,
t=42066 jiffies)
Sep 9 14:41:05 node-10-157-128-100 kernel: [80028.610044] INFO:
rcu_bh_state detected stalls on CPUs/tasks: { 1 7} (detected by 6, t=42066
jiffies)
Sep 9 14:44:01 node-10-157-128-100 kernel: [80204.080047] INFO:
rcu_sched_state detected stalls on CPUs/tasks: { 1 7} (detected by 6,
t=60098 jiffies)
Sep 9 14:44:06 node-10-157-128-100 kernel: [80208.930045] INFO:
rcu_bh_state detected stalls on CPUs/tasks: { 1 7} (detected by 6, t=60098
jiffies)
Sep 9 14:44:44 node-10-157-128-100 kernel: Kernel logging (proc) stopped.
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