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FS#3459 - 802.11s mesh kernel trace at net/core/flow_dissector.c:958 __skb_flow_dissect+0x2c0/0x149c #8328
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msvamp: I can confirm this issue on OpenWrt r15172-af07c6de9c (snapshot) running on netgear-r6220
[ 31.722472] ------------[ cut here ]------------
[ 31.731744] WARNING: CPU: 0 PID: 792 at net/core/flow_dissector.c:958 __skb_flow_dissect+0x2d4/0x16c4
[ 31.750167] Modules linked in: pppoe ppp_async iptable_nat xt_state xt_nat xt_conntrack xt_REDIRECT xt_MASQUERADE xt_FLOWOFFLOAD xt_CT pppox ppp_generic nf_nat nf_flow_table_hw nf_flow_table nf_conntrack_rtcache nf_conntrack mt76x2e mt76x2_common mt76x02_lib mt7603e mt76 mac80211 ipt_REJECT cfg80211 xt_time xt_tcpudp xt_multiport xt_mark xt_mac xt_limit xt_comment xt_TCPMSS xt_LOG slhc nf_reject_ipv4 nf_log_ipv4 nf_defrag_ipv6 nf_defrag_ipv4 iptable_mangle iptable_filter ip_tables crc_ccitt compat ledtrig_usbport nf_log_ipv6 nf_log_common ip6table_mangle ip6table_filter ip6_tables ip6t_REJECT x_tables nf_reject_ipv6 leds_gpio xhci_plat_hcd xhci_pci xhci_mtk xhci_hcd gpio_button_hotplug usbcore nls_base usb_common
[ 31.876229] CPU: 0 PID: 792 Comm: kworker/u5:1 Not tainted 5.4.81 #0
[ 31.888888] Workqueue: napi_workq napi_workfn
[ 31.897545] Stack : 8065bacc 86ca7a4c 806e0000 80720000 86ca5580 8066d684 8041b858 00000009
[ 31.914160] 00000000 86d4b618 00000000 8007d81c 00000000 00000001 86ca7a08 d517992c
[ 31.930772] 00000000 00000000 00000000 00000000 716b726f 00000147 6f775f69 6e666b72
[ 31.947384] 00000000 00000001 00000000 000d9038 00000000 80740000 00000000 8041b858
[ 31.963996] 00000009 00000000 86d4b618 00000000 00000000 803525e0 00000000 80880000
[ 31.980608] ...
[ 31.985459] Call Trace:
[ 31.990332] [<8000b72c>] show_stack+0x30/0x100
[ 31.999182] [<805adc60>] dump_stack+0xa4/0xdc
[ 32.007857] [<8002c014>] __warn+0xc0/0x10c
[ 32.016000] [<8002c0bc>] warn_slowpath_fmt+0x5c/0xac
[ 32.025895] [<8041b858>] __skb_flow_dissect+0x2d4/0x16c4
[ 32.036454] [<8041cef8>] __skb_get_hash+0x7c/0x258
[ 32.046117] [<86f32f84>] ieee80211_reserve_tid+0xf14/0x1408 [mac80211]
[ 32.059541] ---[ end trace c6cce9f22f1fe70f ]---
The mesh link works normally despite this.
root@OpenWrt:~# uname -a
Linux OpenWrt 5.4.81 #0 SMP Tue Dec 8 22:45:10 2020 mips GNU/Linux
|
jonozzz: Still seen on:
https://github.com/torvalds/linux/blob/master/net/core/flow_dissector.c#L984 Seems to be just a one-time warning when net is NULL. |
jonozzz: From the author:
|
mcpratt:
reproduce the problem:
use build from master branch at kernel version 5.4.72
set wireless interface to 802.11s and establish a connection to another mesh point
The link is still good after this, but the impact on performance is unknown.
[ 44.133721] ------------[ cut here ]------------ [ 44.138481] WARNING: CPU: 0 PID: 0 at net/core/flow_dissector.c:958 __skb_flow_dissect+0x2c0/0x149c [ 44.147605] Modules linked in: ath9k ath9k_common pppoe ppp_async iptable_nat ath9k_hw ath xt_state xt_nat xt_conntrack xt_REDIRECT xt_MASQUERADE xt_FLOWOFFLOAD pppox ppp_generic nf_nat nf_flow_table_hw nf_flow_table nf_conntrack_rtcache nf_conntrack mac80211 ipt_REJECT cfg80211 xt_time xt_tcpudp xt_multiport xt_mark xt_mac xt_limit xt_comment xt_TCPMSS xt_LOG slhc nf_reject_ipv4 nf_log_ipv4 nf_defrag_ipv6 nf_defrag_ipv4 iptable_mangle iptable_filter ip_tables crc_ccitt compat nf_log_ipv6 nf_log_common ip6table_mangle ip6table_filter ip6_tables ip6t_REJECT x_tables nf_reject_ipv6 gpio_button_hotplug [ 44.201117] CPU: 0 PID: 0 Comm: swapper Not tainted 5.4.72 #0 [ 44.206914] Stack : 80650000 805ee988 00000000 00000000 805edb58 81c0bc3c 806240fc 80623ce3 [ 44.215337] 80590b9c 00000000 807832d8 81788d44 80d0f418 00000001 81c0bbf0 2470403f [ 44.223761] 00000000 00000000 807b0000 000000c4 61696e74 00000000 2e342e37 32202330 [ 44.232191] 000000c4 71e00000 00000000 0003119d 00000000 00000009 00000000 8039f3b0 [ 44.240618] 00000009 81788d44 80d0f418 80620000 00000000 802feaa4 00000000 80780000 [ 44.249040] ... [ 44.251515] Call Trace: [ 44.254014] [<80069934>] show_stack+0x30/0x100 [ 44.258510] [<80082564>] __warn+0xc0/0x10c [ 44.262647] [<8008260c>] warn_slowpath_fmt+0x5c/0xac [ 44.267666] [<8039f3b0>] __skb_flow_dissect+0x2c0/0x149c [ 44.273027] [<803a0870>] __skb_get_hash+0x7c/0x284 [ 44.278026] [<81731f08>] ieee80211_reserve_tid+0x4f0/0x1188 [mac80211] [ 44.284682] ---[ end trace 4da33b10a9de4dac ]---
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