On 04/12/2018 07:02 AM, John Crispin wrote:


On 12/04/18 12:42, Kristian Evensen wrote:
Hello,

I have recently updated some ramips mt7621-devices (ZBT WG3526) to the
latest nightly. Almost everything seems to work fine, but using either
wifi interface in client mode seems triggers an oops. I see two
different oops-messages:

Message 1:
[   66.442802] CPU 1 Unable to handle kernel paging request at virtual
address e9e9e0d5, epc == 8f3e060c, ra == 8ec86fac
[   66.453460] Oops[#1]:
[   66.455743] CPU: 1 PID: 3679 Comm: wifib Tainted: G W       4.14.32 #0
[   66.462857] task: 8e223200 task.stack: 8e1b4000
[   66.467374] $ 0   : 00000000 00000001 7abc2e80 00000020
[   66.472612] $ 4   : 8ec48bc0 8e76dc20 e9e9dae0 8e1b5848
[   66.477847] $ 8   : 8ec4902c 80452968 00ee4000 ffffff80
[   66.483061] $12   : 80583f8c 00000040 00000000 77f0f3c0
[   66.488276] $16   : 8ec49560 8f578000 8e76d480 8ec48bc0
[   66.493493] $20   : 00000000 00000002 8e1b5cb8 00000008
[   66.498711] $24   : 00000000 77e74ff0
[   66.503937] $28   : 8e1b4000 8e1b5780 00000000 8ec86fac
[   66.509153] Hi    : 00000000
[   66.512020] Lo    : 00000068
[   66.514913] epc   : 8f3e060c 0x8f3e060c
[   66.518866] ra    : 8ec86fac sta_set_sinfo+0xcc/0xbb0 [mac80211]
[   66.524843] Status: 11007c03 KERNEL EXL IE
[   66.529015] Cause : 40800008 (ExcCode 02)
[   66.533005] BadVA : e9e9e0d5
[   66.535869] PrId  : 0001992f (MIPS 1004Kc)
[   66.539941] 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
[   66.610889]  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_tablt
[   66.681822]  ip_set_hash_netiface 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_ipmarm
[   66.753184]  ohci_hcd ehci_platform sd_mod scsi_mod ehci_hcd
gpio_button_hotplug usbcore nls_base usb_common mii
[   66.763357] Process wifib (pid: 3679, threadinfo=8e1b4000,
task=8e223200, tls=77f10ec0)
[   66.771321] Stack : 00000000 00000000 00000000 00000000 00000000
00000000 8e1b5848 8f578000
[   66.779654]         8e76d480 8ec48bc0 8f578130 00000002 8e1b5cb8
00000008 00000000 8ec86fac
[   66.787987]         01000000 8e134628 00000007 8e1b5b98 8e134628
00000000 8e1b5b90 8ec49014
[   66.796325]         8e76d000 00000000 fffffffe 00000002 8e1b5cb8
8ec9e338 8ec315ac 00000000
[   66.804661]         000001d2 80580000 00000000 00000000 00000000
8e134628 8e068840 8ec1fb28
[   66.812996]         ...
[   66.815446] Call Trace:
[   66.817894] [<8f3e060c>] 0x8f3e060c
[   66.821370] Code: 000630c0  02063021  94f40002 <90d205f5> 00e0b025
16800002  3253ffff  2414001f  96d50004
[   66.831098]
[   66.833187] ---[ end trace 8c8a003de3eabcd8 ]---
[   66.841897] Kernel panic - not syncing: Fatal exception
[   66.849317] Rebooting in 3 seconds..

Message 2:
[  132.613293] CPU 0 Unable to handle kernel paging request at virtual
address ea9160d5, epc == 8f2c060c, ra == 8ec86fac
[  132.623927] Oops[#1]:
[  132.626199] CPU: 0 PID: 41 Comm: kworker/u8:3 Tainted: G        W
     4.14.32 #0
[  132.633882] Workqueue: phy0 ieee80211_ibss_leave [mac80211]
[  132.639431] task: 8fd48c80 task.stack: 8fd94000
[  132.643933] $ 0   : 00000000 00000001 7ac52e80 00000020
[  132.649141] $ 4   : 8f2d0bc0 8e04dc20 ea915ae0 8f122400
[  132.654350] $ 8   : 00000000 80452970 8fc02b00 0005376b
[  132.659558] $12   : 000012d8 00000000 ffffffff 0000001c
[  132.664766] $16   : 8f2d1560 8f58a000 8e04d480 8f2d0bc0
[  132.669973] $20   : 00000000 00000001 8f2d1014 00000000
[  132.675181] $24   : 3b9aca00 00000000
[  132.680390] $28   : 8fd94000 8fd95c88 8ece1618 8ec86fac
[  132.685605] Hi    : 000007d0
[  132.688473] Lo    : 00000bb8
[  132.691357] epc   : 8f2c060c 0x8f2c060c
[  132.695235] ra    : 8ec86fac sta_set_sinfo+0xcc/0xbb0 [mac80211]
[  132.701212] Status: 11008403 KERNEL EXL IE
[  132.705391] Cause : 40800008 (ExcCode 02)
[  132.709380] BadVA : ea9160d5
[  132.712247] PrId  : 0001992f (MIPS 1004Kc)
[  132.716320] 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
[  132.787381]  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_tablt
[  132.858369]  ip_set_hash_netiface 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_ipmarm
[  132.929808]  ohci_hcd ehci_platform sd_mod scsi_mod ehci_hcd
gpio_button_hotplug usbcore nls_base usb_common mii
[  132.939989] Process kworker/u8:3 (pid: 41, threadinfo=8fd94000,
task=8fd48c80, tls=00000000)
[  132.948385] Stack : 00000001 8f2c08fc 8f2d1330 8e04d480 8f2d0bc0
8e04d480 8f122400 8f58a000
[  132.956736]         8e04d480 8f2d0bc0 8f58a130 00000001 8f2d1014
00000000 8ece1618 8ec86fac
[  132.965084]         00000002 8f58a000 00000001 8ec86df4 8f58a000
8f2d0bc0 8f58a000 8f122400
[  132.973434]         8e04d480 8e04d480 8fd95d38 00000001 8f2d1014
8ec87a10 00000000 8007be44
[  132.981784]         00000000 00000000 00000000 8fd95d10 8fd95d30
8f2d102c 8f2d102c 8ec87de8
[  132.990130]         ...
[  132.992578] Call Trace:
[  132.995025] [<8f2c060c>] 0x8f2c060c
[  132.998506] Code: 000630c0  02063021  94f40002 <90d205f5> 00e0b025
16800002  3253ffff  2414001f  96d50004
[  133.008251]
[  133.011063] ---[ end trace 43bd4ffe21fcd0aa ]---
[  133.019992] Kernel panic - not syncing: Fatal exception
[  133.027692] Rebooting in 3 seconds..

The WG3526 uses mt7603 for 2.4GHz and mt7612 for 5GHz, and the error
happens with either. Using the interfaces as APs works fine (at least
in my tests), and using the interfaces as clients works fine with
kernel 4.9.

I saw similar crash on my dual core sunx1 system, with 4.14.
Seems to happen when the CPU is doing more than routing traffic.

[45729.124237] Unable to handle kernel NULL pointer deref8

[45729.132661] pgd = edc4ad00

[45729.135502] [00000028] *pgd=6e733003, *pmd=7fc26003

[45729.140895] Internal error: Oops: 207 [#1] PREEMPT SMP ARM

[45729.146387] Modules linked in: rt2800usb rt2800lib rt2x00usb rt2x00lib pppoet

[45729.217382]  ip_set_bitmap_ipmac ip_set_bitmap_ip ip_set nfnetlink ip6t_REJEm

[45729.235828] CPU: 0 PID: 4028 Comm: e2guardian Not tainted 4.14.25 #0

[45729.242172] Hardware name: Allwinner sun7i (A20) Family

[45729.247391] task: edf71500 task.stack: edf7c000

[45729.251928] PC is at tcp_push+0x44/0xfc

[45729.255761] LR is at 0xed34eb34

[45729.258899] pc : [<c06285d4>]    lr : [<ed34eb34>] psr: 40000013

[45729.265156] sp : edf7de00  ip : ed416780 fp : ed34eb34


try enabling KALLSYMS to get a verbose stack trace.
    John


Thanks in advance for any help,
Kristian
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