[FS#804] mt7621: kernel errors - rcu_sched detected stalls on CPUs/tasks

Mon Jul 24 07:18:26 PDT 2017

The following task has a new comment added:

FS#804 - mt7621: kernel errors - rcu_sched detected stalls on CPUs/tasks
User who did this - camel (camel)

----------
hmm, tried it again ....

yes, seems to be more packages missing or not fully correct with build options ...

root at LEDE:~# opkg install ppp-mod-pptp kmod-nf-nathelper-extra
Installing ppp-mod-pptp (2.4.7-12) to root...
Downloading http://downloads.lede-project.org/snapshots/packages/mipsel_24kc/base/ppp-mod-pptp_2.4.7-12_mipsel_24kc.ipk
Installing kmod-mppe (4.9.37-1) to root...
Downloading http://downloads.lede-project.org/snapshots/targets/ramips/mt7621/packages/kmod-mppe_4.9.37-1_mipsel_24kc.ipk
Installing kmod-nf-nathelper-extra (4.9.37-1) to root...
Downloading http://downloads.lede-project.org/snapshots/targets/ramips/mt7621/packages/kmod-nf-nathelper-extra_4.9.37-1_mipsel_24kc.ipk
Installing kmod-lib-textsearch (4.9.37-1) to root...
Downloading http://downloads.lede-project.org/snapshots/targets/ramips/mt7621/packages/kmod-lib-textsearch_4.9.37-1_mipsel_24kc.ipk
Configuring kmod-lib-textsearch.
Configuring kmod-mppe.
Configuring ppp-mod-pptp.
Configuring kmod-nf-nathelper-extra.
2 modules could not be probed
- nf_conntrack_pptp
- nf_conntrack_proto_gre
1 module could not be probed
- nf_conntrack_proto_gre
4 modules could not be probed
- nf_conntrack_pptp
- nf_conntrack_proto_gre
- nf_nat_pptp
- nf_nat_proto_gre
1 module could not be probed
- nf_nat_proto_gre

then i saw in logs:

Mon Jul 24 14:06:52 2017 kern.warn kernel: [ 1324.590000] ip_tunnel: Unknown symbol dst_cache_set_ip4 (err 0)
Mon Jul 24 14:06:52 2017 kern.warn kernel: [ 1324.600000] ip_tunnel: Unknown symbol dst_cache_destroy (err 0)
Mon Jul 24 14:06:52 2017 kern.warn kernel: [ 1324.600000] ip_tunnel: Unknown symbol dst_cache_init (err 0)
Mon Jul 24 14:06:52 2017 kern.warn kernel: [ 1324.610000] ip_tunnel: Unknown symbol dst_cache_get_ip4 (err 0)
Mon Jul 24 14:06:52 2017 kern.info kernel: [ 1324.730000] gre: GRE over IPv4 demultiplexor driver
Mon Jul 24 14:06:53 2017 kern.warn kernel: [ 1324.740000] ip_gre: Unknown symbol ip_tunnel_rcv (err 0)
Mon Jul 24 14:06:53 2017 kern.warn kernel: [ 1324.750000] ip_gre: Unknown symbol ip_tunnel_change_mtu (err 0)
Mon Jul 24 14:06:53 2017 kern.warn kernel: [ 1324.750000] ip_gre: Unknown symbol ip_tunnel_encap_setup (err 0)
Mon Jul 24 14:06:53 2017 kern.warn kernel: [ 1324.760000] ip_gre: Unknown symbol dst_cache_set_ip4 (err 0)
Mon Jul 24 14:06:53 2017 kern.warn kernel: [ 1324.760000] ip_gre: Unknown symbol ip_tunnel_init_net (err 0)
Mon Jul 24 14:06:53 2017 kern.warn kernel: [ 1324.770000] ip_gre: Unknown symbol ip_tunnel_changelink (err 0)
Mon Jul 24 14:06:53 2017 kern.warn kernel: [ 1324.780000] ip_gre: Unknown symbol ip_tunnel_ioctl (err 0)
Mon Jul 24 14:06:53 2017 kern.warn kernel: [ 1324.780000] ip_gre: Unknown symbol ip_tunnel_get_link_net (err 0)
Mon Jul 24 14:06:53 2017 kern.warn kernel: [ 1324.790000] ip_gre: Unknown symbol ip_tunnel_init (err 0)
Mon Jul 24 14:06:53 2017 kern.warn kernel: [ 1324.790000] ip_gre: Unknown symbol ip_tunnel_delete_net (err 0)
Mon Jul 24 14:06:53 2017 kern.warn kernel: [ 1324.800000] ip_gre: Unknown symbol ip_tunnel_uninit (err 0)
Mon Jul 24 14:06:53 2017 kern.warn kernel: [ 1324.810000] ip_gre: Unknown symbol ip_tunnel_newlink (err 0)
Mon Jul 24 14:06:53 2017 kern.warn kernel: [ 1324.810000] ip_gre: Unknown symbol ip_tunnel_dellink (err 0)
Mon Jul 24 14:06:53 2017 kern.warn kernel: [ 1324.820000] ip_gre: Unknown symbol ip_tunnel_setup (err 0)
Mon Jul 24 14:06:53 2017 kern.warn kernel: [ 1324.820000] ip_gre: Unknown symbol ip_tunnel_xmit (err 0)
Mon Jul 24 14:06:53 2017 kern.warn kernel: [ 1324.830000] ip_gre: Unknown symbol dst_cache_get_ip4 (err 0)
Mon Jul 24 14:06:53 2017 kern.warn kernel: [ 1324.830000] ip_gre: Unknown symbol __ip_tunnel_change_mtu (err 0)
Mon Jul 24 14:06:53 2017 kern.warn kernel: [ 1324.840000] ip_gre: Unknown symbol ip_tunnel_lookup (err 0)
Mon Jul 24 14:06:53 2017 kern.warn kernel: [ 1324.850000] ip_gre: Unknown symbol ip_tunnel_get_iflink (err 0)
Mon Jul 24 14:06:53 2017 kern.info kernel: [ 1324.990000] PPTP driver version 0.8.5
Mon Jul 24 14:07:00 2017 kern.info kernel: [ 1332.670000] PPP MPPE Compression module registered
Mon Jul 24 14:07:01 2017 kern.warn kernel: [ 1332.950000] nf_conntrack_proto_gre: Unknown symbol nf_ct_port_nlattr_tuple_size (err 0)
Mon Jul 24 14:07:01 2017 kern.warn kernel: [ 1332.950000] nf_conntrack_proto_gre: Unknown symbol nf_ct_port_nla_policy (err 0)
Mon Jul 24 14:07:01 2017 kern.warn kernel: [ 1332.960000] nf_conntrack_proto_gre: Unknown symbol nf_ct_port_tuple_to_nlattr (err 0)
Mon Jul 24 14:07:01 2017 kern.warn kernel: [ 1332.970000] nf_conntrack_proto_gre: Unknown symbol nf_ct_port_nlattr_to_tuple (err 0)
Mon Jul 24 14:07:01 2017 kern.warn kernel: [ 1333.070000] nf_conntrack_proto_gre: Unknown symbol nf_ct_port_nlattr_tuple_size (err 0)
Mon Jul 24 14:07:01 2017 kern.warn kernel: [ 1333.080000] nf_conntrack_proto_gre: Unknown symbol nf_ct_port_nla_policy (err 0)
Mon Jul 24 14:07:01 2017 kern.warn kernel: [ 1333.090000] nf_conntrack_proto_gre: Unknown symbol nf_ct_port_tuple_to_nlattr (err 0)
Mon Jul 24 14:07:01 2017 kern.warn kernel: [ 1333.090000] nf_conntrack_proto_gre: Unknown symbol nf_ct_port_nlattr_to_tuple (err 0)
Mon Jul 24 14:07:01 2017 kern.warn kernel: [ 1333.380000] nf_conntrack_proto_gre: Unknown symbol nf_ct_port_nlattr_tuple_size (err 0)
Mon Jul 24 14:07:01 2017 kern.warn kernel: [ 1333.390000] nf_conntrack_proto_gre: Unknown symbol nf_ct_port_nla_policy (err 0)
Mon Jul 24 14:07:01 2017 kern.warn kernel: [ 1333.400000] nf_conntrack_proto_gre: Unknown symbol nf_ct_port_tuple_to_nlattr (err 0)
Mon Jul 24 14:07:01 2017 kern.warn kernel: [ 1333.400000] nf_conntrack_proto_gre: Unknown symbol nf_ct_port_nlattr_to_tuple (err 0)
Mon Jul 24 14:07:01 2017 kern.warn kernel: [ 1333.460000] nf_nat_proto_gre: Unknown symbol nf_nat_l4proto_nlattr_to_range (err 0)
Mon Jul 24 14:07:01 2017 kern.warn kernel: [ 1333.530000] nf_nat_proto_gre: Unknown symbol nf_nat_l4proto_nlattr_to_range (err 0)

then i proceed with other packages (monitoring) .. and then i got a crash ...
Mon Jul 24 14:10:45 2017 kern.alert kernel: [ 1557.110000] CPU 2 Unable to handle kernel paging request at virtual address 00000000, epc == 8efd1970, ra == 8efd1970
Mon Jul 24 14:10:45 2017 kern.warn kernel: [ 1557.120000] Oops[#1]:
Mon Jul 24 14:10:45 2017 kern.warn kernel: [ 1557.120000] CPU: 2 PID: 9671 Comm: insmod Not tainted 4.9.37 #0
Mon Jul 24 14:10:45 2017 kern.warn kernel: [ 1557.130000] task: 8fe8f580 task.stack: 8eafa000
Mon Jul 24 14:10:45 2017 kern.warn kernel: [ 1557.130000] $ 0   : 00000000 00000069 00040925 00040925
Mon Jul 24 14:10:45 2017 kern.warn kernel: [ 1557.140000] $ 4   : 8eafbc74 00000000 00000000 27c82c2a
Mon Jul 24 14:10:45 2017 kern.warn kernel: [ 1557.140000] $ 8   : 00000000 801e2050 00000000 80556070
Mon Jul 24 14:10:45 2017 kern.warn kernel: [ 1557.150000] $12   : 8eafbbe0 00000000 00000000 124dab96
Mon Jul 24 14:10:45 2017 kern.warn kernel: [ 1557.150000] $16   : 8fec0800 00000000 8efd19ac 00000001
Mon Jul 24 14:10:45 2017 kern.warn kernel: [ 1557.160000] $20   : 00000000 8efd18a4 8efd0000 024000c0
Mon Jul 24 14:10:45 2017 kern.warn kernel: [ 1557.160000] $24   : 00000002 df6052aa
Mon Jul 24 14:10:45 2017 kern.warn kernel: [ 1557.170000] $28   : 8eafa000 8eafbc90 80091f7c 8efd1970
Mon Jul 24 14:10:45 2017 kern.warn kernel: [ 1557.170000] Hi    : 00000000
Mon Jul 24 14:10:45 2017 kern.warn kernel: [ 1557.180000] Lo    : 00000000
Mon Jul 24 14:10:45 2017 kern.warn kernel: [ 1557.180000] epc   : 8efd1970 init_module+0xbca970/0xbca9a0 [ifb]
Mon Jul 24 14:10:45 2017 kern.warn kernel: [ 1557.180000] ra    : 8efd1970 init_module+0xbca970/0xbca9a0 [ifb]
Mon Jul 24 14:10:45 2017 kern.warn kernel: [ 1557.190000] Status: 1100fc03      KERNEL EXL IE
Mon Jul 24 14:10:45 2017 kern.warn kernel: [ 1557.190000] Cause : 40800008 (ExcCode 02)
Mon Jul 24 14:10:45 2017 kern.warn kernel: [ 1557.200000] BadVA : 00000000
Mon Jul 24 14:10:45 2017 kern.warn kernel: [ 1557.200000] PrId  : 0001992f (MIPS 1004Kc)
Mon Jul 24 14:10:45 2017 kern.warn kernel: [ 1557.210000] Modules linked in: ifb(+) xt_NETMAP nf_nat_tftp nf_nat_snmp_basic nf_nat_sip nf_nat_irc nf_nat_h323 nf_nat_amanda nf_conntrack_tftp nf_conntrack_snmp nf_conntrack_sip nf_conntrack_irc nf_conntrack_h323 nf_conntrack_broadcast nf_conntrack_amanda ppp_mppe ts_kmp ts_fsm ts_bm sha1_generic pptp gre ecb option usb_wwan usbserial crc32_generic vfat fat nls_utf8 nls_iso8859_1 nls_cp437 pppoe ppp_async ath9k rtl8821ae rtl8192se rtl8192de rtl8192cu rtl8192c_

and then boot loop ... :(
----------

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=804#comment3091