[FS#796] Multi-SSID does not work on MT7603 (ZBT-3526) at 2.4 GHz

Thu May 25 09:52:10 PDT 2017

The following task has a new comment added:

FS#796 - Multi-SSID does not work on MT7603 (ZBT-3526) at 2.4  GHz
User who did this - camel (camel)

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I'm afraid, the whole mt76 driver for the zbt3526 (mt7621 devices) is buggy as hell.
as long as this is not fixed, you can fully forget the 2,4GHZ network :)

the performance is very poor, but more important .... IT IS NOT STABLE.
it is crashing many often. EG: i can't DL/UP 1GB through the 2,4 GHZ wifi without a full crash of the WIFI .. then i get kernel panics always like that:

Thu May 25 14:42:09 2017 kern.warn kernel: [ 2148.310000] ------------[ cut here ]------------
Thu May 25 14:42:09 2017 kern.warn kernel: [ 2148.310000] WARNING: CPU: 2 PID: 16074 at /home/buildbot/slave-lede-local/ramips_mt7621/build/build_dir/target-mipsel_24kc_musl/linux-ramips_mt7621/mt76-2017-03-17-712b8e8f/mt7603_mac.c:1231 mt7603_mac_work+0x204/0x284 [mt7603e]()
Thu May 25 14:42:09 2017 kern.warn kernel: [ 2148.330000] Modules linked in: pppoe ppp_async option usb_wwan pptp pppox ppp_mppe ppp_generic nf_nat_pptp nf_conntrack_pptp nf_conntrack_ipv6 iptable_nat ipt_REJECT ipt_MASQUERADE xt_time xt_tcpudp xt_tcpmss xt_statistic xt_state xt_recent xt_nat xt_multiport xt_mark xt_mac xt_limit xt_length xt_hl xt_helper xt_ecn xt_dscp xt_conntrack xt_connmark xt_connlimit xt_connbytes xt_comment xt_TCPMSS xt_REDIRECT xt_NETMAP xt_LOG xt_HL xt_DSCP xt_CT xt_CLASSIFY usbserThu May 25 14:42:09 2017 kern.warn kernel: [ 2148.500000] CPU: 2 PID: 16074 Comm: kworker/u8:4 Tainted: G        W       4.4.69 #0
Thu May 25 14:42:09 2017 kern.warn kernel: [ 2148.510000] Workqueue: phy0 mt7603_mac_work [mt7603e]
Thu May 25 14:42:09 2017 kern.warn kernel: [ 2148.510000] Stack : 8e81ae80 80490000 80408a8c 000004cf 8eced470 00000009 8fc04614 8e81ae98
Thu May 25 14:42:09 2017 kern.warn kernel: [ 2148.510000] 	  00000088 80064fa8 80408a8c 00000002 00003eca 804f367c 80424570 8e94fd54
Thu May 25 14:42:09 2017 kern.warn kernel: [ 2148.510000] 	  80490000 80062cf4 80490000 80510000 804942c8 804942cc 8040d3ac 8e94fd54
Thu May 25 14:42:09 2017 kern.warn kernel: [ 2148.510000] 	  80490000 800424d0 8fc04614 8e94fd8c 0000084c 00000000 00000000 0094fd74
Thu May 25 14:42:09 2017 kern.warn kernel: [ 2148.510000] 	  8eced26c 8fcf8800 8fcf8900 30796870 00000000 00000000 00000000 00000000
Thu May 25 14:42:09 2017 kern.warn kernel: [ 2148.510000] 	  ...
Thu May 25 14:42:09 2017 kern.warn kernel: [ 2148.550000] Call Trace:
Thu May 25 14:42:09 2017 kern.warn kernel: [ 2148.550000] [] show_stack+0x50/0x84
Thu May 25 14:42:09 2017 kern.warn kernel: [ 2148.550000] [] dump_stack+0x84/0xbc
Thu May 25 14:42:09 2017 kern.warn kernel: [ 2148.560000] [] warn_slowpath_common+0xa0/0xd0
Thu May 25 14:42:09 2017 kern.warn kernel: [ 2148.560000] [] warn_slowpath_null+0x18/0x24
Thu May 25 14:42:09 2017 kern.warn kernel: [ 2148.570000] [] mt7603_mac_work+0x204/0x284 [mt7603e]
Thu May 25 14:42:09 2017 kern.warn kernel: [ 2148.570000] [] process_one_work+0x214/0x358
Thu May 25 14:42:09 2017 kern.warn kernel: [ 2148.580000] [] worker_thread+0x2d8/0x440
Thu May 25 14:42:09 2017 kern.warn kernel: [ 2148.580000] [] kthread+0xd8/0xec
Thu May 25 14:42:09 2017 kern.warn kernel: [ 2148.590000] [] ret_from_kernel_thread+0x14/0x1c
Thu May 25 14:42:09 2017 kern.warn kernel: [ 2148.590000] 
Thu May 25 14:42:09 2017 kern.warn kernel: [ 2148.600000] ---[ end trace 6537317262657585 ]---
Thu May 25 14:42:16 2017 kern.warn kernel: [ 2154.840000] ------------[ cut here ]------------
Thu May 25 14:42:16 2017 kern.warn kernel: [ 2154.840000] WARNING: CPU: 3 PID: 16074 at /home/buildbot/slave-lede-local/ramips_mt7621/build/build_dir/target-mipsel_24kc_musl/linux-ramips_mt7621/mt76-2017-03-17-712b8e8f/mt7603_mac.c:1228 mt7603_mac_work+0x1bc/0x284 [mt7603e]()
Thu May 25 14:42:16 2017 kern.warn kernel: [ 2154.860000] Modules linked in: pppoe ppp_async option usb_wwan pptp pppox ppp_mppe ppp_generic nf_nat_pptp nf_conntrack_pptp nf_conntrack_ipv6 iptable_nat ipt_REJECT ipt_MASQUERADE xt_time xt_tcpudp xt_tcpmss xt_statistic xt_state xt_recent xt_nat xt_multiport xt_mark xt_mac xt_limit xt_length xt_hl xt_helper xt_ecn xt_dscp xt_conntrack xt_connmark xt_connlimit xt_connbytes xt_comment xt_TCPMSS xt_REDIRECT xt_NETMAP xt_LOG xt_HL xt_DSCP xt_CT xt_CLASSIFY usbserThu May 25 14:42:16 2017 kern.warn kernel: [ 2155.030000] CPU: 3 PID: 16074 Comm: kworker/u8:4 Tainted: G        W       4.4.69 #0
Thu May 25 14:42:16 2017 kern.warn kernel: [ 2155.040000] Workqueue: phy0 mt7603_mac_work [mt7603e]
Thu May 25 14:42:16 2017 kern.warn kernel: [ 2155.040000] Stack : 8e81ae80 80490000 80408a8c 000004cc 8eced428 00000009 8fc04614 8e81ae98
Thu May 25 14:42:16 2017 kern.warn kernel: [ 2155.040000] 	  00000088 80064fa8 80408a8c 00000003 00003eca 804f367c 80424570 8e94fd54
Thu May 25 14:42:16 2017 kern.warn kernel: [ 2155.040000] 	  80490000 80062cf4 80490000 80510000 804942c8 804942cc 8040d3ac 8e94fd54
Thu May 25 14:42:16 2017 kern.warn kernel: [ 2155.040000] 	  80490000 800424d0 8fc04614 8e94fd8c 00000a22 00000000 8fc04614 0094fd74
Thu May 25 14:42:16 2017 kern.warn kernel: [ 2155.040000] 	  8eced26c 8fcf8800 8fcf8900 30796870 00000000 00000000 00000000 00000000
Thu May 25 14:42:16 2017 kern.warn kernel: [ 2155.040000] 	  ...
Thu May 25 14:42:16 2017 kern.warn kernel: [ 2155.080000] Call Trace:
Thu May 25 14:42:16 2017 kern.warn kernel: [ 2155.080000] [] show_stack+0x50/0x84
Thu May 25 14:42:16 2017 kern.warn kernel: [ 2155.080000] [] dump_stack+0x84/0xbc
Thu May 25 14:42:16 2017 kern.warn kernel: [ 2155.090000] [] warn_slowpath_common+0xa0/0xd0
Thu May 25 14:42:16 2017 kern.warn kernel: [ 2155.090000] [] warn_slowpath_null+0x18/0x24
Thu May 25 14:42:16 2017 kern.warn kernel: [ 2155.100000] [] mt7603_mac_work+0x1bc/0x284 [mt7603e]
Thu May 25 14:42:16 2017 kern.warn kernel: [ 2155.110000] [] process_one_work+0x214/0x358
Thu May 25 14:42:16 2017 kern.warn kernel: [ 2155.110000] [] worker_thread+0x2d8/0x440
Thu May 25 14:42:16 2017 kern.warn kernel: [ 2155.120000] [] kthread+0xd8/0xec
Thu May 25 14:42:16 2017 kern.warn kernel: [ 2155.120000] [] ret_from_kernel_thread+0x14/0x1c
Thu May 25 14:42:16 2017 kern.warn kernel: [ 2155.130000] 
Thu May 25 14:42:16 2017 kern.warn kernel: [ 2155.130000] ---[ end trace 6537317262657586 ]---

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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=796#comment2669