[ovs-dev] [PATCH V2] datapath: Prevent panic

Gregory Rose gvrose8192 at gmail.com
Fri Apr 20 16:03:14 UTC 2018


On 4/20/2018 5:39 AM, Eric Garver wrote:
> On Thu, Apr 19, 2018 at 08:07:33PM -0700, Gregory Rose wrote:
> Fantastic, I'll test this and whip up a patch.
>> Thanks!
>>
>> - Greg
> I'll be on the lookout for it. Thanks.
>
> [..]

Eric,

with the above patch I'm getting this on a stock RHEL 7.4 kernel:

[  599.659110] NMI watchdog: BUG: soft lockup - CPU#3 stuck for 22s! 
[ovstest:23936]
[  599.659464] Modules linked in: nf_nat_tftp nf_conntrack_tftp 
nf_nat_ftp nf_conntrack_ftp nf_conntrack_netlink bonding 8021q garp mrp 
veth netconsole ip6t_rpfilter ipt_REJECT nf_reject_ipv4 ip6t_REJECT 
nf_reject_ipv6 xt_conntrack ip_set nfnetlink ebtable_nat ebtable_broute 
bridge stp llc ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 
ip6table_mangle ip6table_security ip6table_raw iptable_nat 
nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack 
iptable_mangle iptable_security iptable_raw ebtable_filter ebtables 
ip6table_filter ip6_tables iptable_filter snd_hda_codec_generic 
snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep snd_seq 
snd_seq_device snd_pcm iosf_mbi snd_timer ppdev snd crc32_pclmul 
ghash_clmulni_intel aesni_intel sg lrw gf128mul glue_helper ablk_helper 
pcspkr i2c_piix4 joydev cryptd soundcore virtio_balloon parport_pc 
parport ip_tables xfs libcrc32c sr_mod cdrom ata_generic pata_acpi qxl 
drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm drm 
virtio_console virtio_blk virtio_net ata_piix libata crct10dif_pclmul 
crct10dif_common crc32c_intel serio_raw floppy i2c_core virtio_pci 
virtio_ring virtio dm_mirror dm_region_hash dm_log dm_mod [last 
unloaded: ip6_udp_tunnel]
[  599.662118] CPU: 3 PID: 23936 Comm: ovstest Tainted: G OE  
------------   3.10.0-693.el7.x86_64 #1
[  599.662351] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011
[  599.662573] task: ffff880235871fa0 ti: ffff880218668000 task.ti: 
ffff880218668000
[  599.662823] RIP: 0010:[<ffffffffc0437210>] [<ffffffffc0437210>] 
nf_ct_iterate_cleanup+0xb0/0x210 [nf_conntrack]
[  599.663082] RSP: 0018:ffff88021866b870  EFLAGS: 00000246
[  599.663325] RAX: 0000000000000001 RBX: ffff88017cebec00 RCX: 
0000000000000000
[  599.663583] RDX: 0000000000006b35 RSI: 0000000000000000 RDI: 
ffff88022de5e140
[  599.663828] RBP: ffff88021866b8b0 R08: 0000000000000000 R09: 
0000000000000000
[  599.664070] R10: ffff88017cebec00 R11: 0000000000000400 R12: 
0000000000000000
[  599.664310] R13: ffff88021866b8b0 R14: 0000000000000000 R15: 
0000000000000000
[  599.664548] FS:  00007f3c91f91a00(0000) GS:ffff88023fd80000(0000) 
knlGS:0000000000000000
[  599.664790] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  599.665030] CR2: 00000000004be7a0 CR3: 000000021d745000 CR4: 
00000000001406e0
[  599.665274] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
0000000000000000
[  599.665514] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 
0000000000000400
[  599.665753] Stack:
[  599.665984]  00005d8000000000 ffffffffc044c594 ffffffff81ad9d40 
ffff88021866b948
[  599.666251]  ffffffff81ad9d40 ffff8802347ed400 0000000000000014 
ffffffff81ad9d40
[  599.666535]  ffff88021866b8c0 ffffffffc043738c ffff88021866b938 
ffffffffc053688b
[  599.666809] Call Trace:
[  599.667056]  [<ffffffffc043738c>] nf_conntrack_flush_report+0x1c/0x20 
[nf_conntrack]
[  599.667310]  [<ffffffffc053688b>] ctnetlink_del_conntrack+0x19b/0x1d0 
[nf_conntrack_netlink]
[  599.667587]  [<ffffffff8134bfa2>] ? nla_parse+0x32/0x120
[  599.667842]  [<ffffffffc04e050f>] nfnetlink_rcv_msg+0x24f/0x260 
[nfnetlink]
[  599.668105]  [<ffffffffc04e02c0>] ? nfnetlink_bind+0x60/0x60 [nfnetlink]
[  599.668356]  [<ffffffff815bd929>] netlink_rcv_skb+0xa9/0xc0
[  599.668622]  [<ffffffffc04e088f>] nfnetlink_rcv+0x27f/0x50a [nfnetlink]
[  599.668921]  [<ffffffff815bd012>] netlink_unicast+0xf2/0x1b0
[  599.669179]  [<ffffffff815bd3ef>] netlink_sendmsg+0x31f/0x6a0
[  599.669434]  [<ffffffff812b4d65>] ? sock_has_perm+0x75/0x90
[  599.669690]  [<ffffffff8156a580>] sock_sendmsg+0xb0/0xf0
[  599.669939]  [<ffffffff81328da2>] ? radix_tree_lookup_slot+0x22/0x50
[  599.670199]  [<ffffffff8156ae29>] ___sys_sendmsg+0x3a9/0x3c0
[  599.670438]  [<ffffffff815baac0>] ? netlink_insert+0x1a0/0x2f0
[  599.670701]  [<ffffffff812b4d65>] ? sock_has_perm+0x75/0x90
[  599.670950]  [<ffffffff815691b2>] ? move_addr_to_user+0xb2/0xd0
[  599.671207]  [<ffffffff8156929c>] ? SYSC_getsockname+0xcc/0xe0
[  599.671458]  [<ffffffff8156b5f1>] __sys_sendmsg+0x51/0x90
[  599.671704]  [<ffffffff8156b642>] SyS_sendmsg+0x12/0x20
[  599.671943]  [<ffffffff816b4fc9>] system_call_fastpath+0x16/0x1b
[  599.672186] Code: 74 16 e9 3c 01 00 00 0f 1f 40 00 4d 8b 3f 41 f6 c7 
01 0f 85 2b 01 00 00 41 80 7f 37 00 75 ec 4d 8d 6f f0 4c 89 e6 4c 89 ef 
ff d3 <85> c0 74 dc f0 41 ff 45 00 48 8b 7d c8 ff 14 25 50 31 a1 81 e8

So perhaps there's something else going on?

Thanks,

- Greg


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