OpenWrt/LEDE Project

  • Status Unconfirmed
  • Percent Complete
    0%
  • Task Type Bug Report
  • Category Kernel
  • Assigned To No-one
  • Operating System All
  • Severity Low
  • Priority Very Low
  • Reported Version Trunk
  • Due in Version Undecided
  • Due Date Undecided
  • Private
Attached to Project: OpenWrt/LEDE Project
Opened by Michael Pratt - 18.11.2020

FS#3459 - 802.11s mesh kernel trace at net/core/flow_dissector.c:958 __skb_flow_dissect+0x2c0/0x149c

reproduce the problem:

1. use build from master branch at kernel version 5.4.72

2. 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 ]---
Manas Sambhus commented on 22.12.2020 05:04

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

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