[LEDE-DEV] [OpenWrt-Devel] Wifi-related kernel-oops on mt7621 after 4.14 update

[Kristian Evensen]

Hello,

On Wed, Apr 18, 2018 at 11:34 AM, Kristian Evensen
<kristian.evensen at gmail.com> wrote:
> I will keep an eye on this router, just in case, but it seems the
> problem is gone. Thanks for fixing it so fast!

The router (WG3526) has been running fine for a while now, but after
changing configuration from client to access point (for both
interfaces) and updating I started seeing kernel oopses + reboot loops
again. The error messages is as follows:

[   30.665207] CPU 1 Unable to handle kernel paging request at virtual
address ea09a0dd, epc == 8f3a060c, ra == 8ed06fac
[   30.676034] Oops[#1]:
[   30.678341] CPU: 1 PID: 27 Comm: kworker/u8:1 Not tainted 4.14.37 #0
[   30.684852] Workqueue: phy0 ieee80211_ibss_leave [mac80211]
[   30.690409] task: 8fce8000 task.stack: 8fce4000
[   30.694922] $ 0   : 00000000 00000001 7ac0ae80 00000020
[   30.700149] $ 4   : 8ec4cbc0 8ee83c20 ea099ae0 8f79f400
[   30.705373] $ 8   : 00000000 80452db0 00000007 00096a93
[   30.710593] $12   : 00000000 00000264 000390fa 77f5d3c0
[   30.715812] $16   : 8ec4d560 8f581000 8ee83480 8ec4cbc0
[   30.721033] $20   : 00000000 00000000 80560000 fffffffe
[   30.726252] $24   : 00000fa3 80058514
[   30.731475] $28   : 8fce4000 8fce5ce8 80570000 8ed06fac
[   30.736697] Hi    : 0000000a
[   30.739562] Lo    : 66666669
[   30.742470] epc   : 8f3a060c 0x8f3a060c
[   30.746401] ra    : 8ed06fac sta_set_sinfo+0xcc/0xbb0 [mac80211]
[   30.752380] Status: 11007c03 KERNEL EXL IE
[   30.756561] Cause : 40800008 (ExcCode 02)
[   30.760550] BadVA : ea09a0dd
[   30.763418] PrId  : 0001992f (MIPS 1004Kc)
[   30.767492] Modules linked in: rt2800pci rt2800mmio rt2800lib
qcserial ppp_async option usb_wwan rt2x00pci rt2x00mmio rt2x00lib
rndis_host qmi_wwan ppp_generic nf_nat_pptp nf_conntrack_pptp
nf_conntrack_ipv6p
[   30.838554]  nf_nat_snmp_basic nf_nat_sip nf_nat_redirect
nf_nat_proto_gre nf_nat_masquerade_ipv4 nf_nat_irc nf_conntrack_ipv4
nf_nat_ipv4 nf_nat_h323 nf_nat_ftp nf_nat_amanda nf_nat nf_log_ipv4
nf_flow_table
[   30.909546]  ip_set_hash_netport ip_set_hash_netnet ip_set_hash_net
ip_set_hash_netportnet ip_set_hash_mac ip_set_hash_ipportnet
ip_set_hash_ipportip ip_set_hash_ipport ip_set_hash_ipmark
ip_set_hash_ip ip_sd
[   30.979947]  ehci_platform sd_mod scsi_mod ehci_hcd
gpio_button_hotplug usbcore nls_base usb_common mii
[   30.989345] Process kworker/u8:1 (pid: 27, threadinfo=8fce4000,
task=8fce8000, tls=00000000)
[   30.997742] Stack : 00000200 00000000 8fce5d78 00000000 8fce5d78
80081240 8f79f400 8f581000
[   31.006092]         8ee83480 8ec4cbc0 8f581130 00000000 80560000
fffffffe 80570000 8ed06fac
[   31.014443]         00000000 8f581000 8fc06000 8ee834ac 8f581000
8ec4cbc0 8f581000 8f79f400
[   31.022793]         8ee83480 8ee834ac 8ec4cbc0 00000000 80560000
8ed07a10 8f148a80 8007be74
[   31.031143]         00000000 00000000 8fce5d70 8fce5d70 00000000
8f581000 8fc06000 8ed07ac0
[   31.039491]         ...
[   31.041940] Call Trace:
[   31.044386] [<8f3a060c>] 0x8f3a060c
[   31.047866] Code: 000630c0  02063021  94f40002 <90d205fd> 00e0b025
16800002  3253ffff  2414001f  96d50004
[   31.057611]
[   31.059362] ---[ end trace 7868a781b307fb50 ]---
[   31.068983] Kernel panic - not syncing: Fatal exception
[   31.076144] Rebooting in 3 seconds..

I will try to compile an image with KALLMSYS and see if I can
reproduce the issue. My firmware is based on latest nightly.

BR,
Kristian