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IndentiFi AP crashes frequently in areas with thousands of wifi-clients that are medical devices

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TitleIndentiFi AP crashes frequently in areas with thousands of wifi-clients that are medical devices
Symptoms
  • AP crashes frequently in areas with thousands of wifi-clients that are medical devices
  • High rate of association/disassociation
  • De-auth floods

AP crash excerpt
 
Modules linked in: dpi_drv(P) chantry_ext(P) ath_pktlog(P) umac ath_dev(P) ath_dfs(P) ath_spectral(P) ath_rate_atheros(P) ath_hal(P) asf(P) adf(P) tunnelDrv(P) tlvDrv(P) ipsecXform(P) t23xrm bonding ap_drv(P) libeCrypto(P) m2Task(P) atherosHooks(P) prodenv(P)
NIP: d26ef318 LR: d26ef318 CTR: 00000001
REGS: cbfd7a30 TRAP: 0700   Tainted: P             (2.6.35--10.11.26.1293X+)
MSR: 00021000 <ME,CE>  CR: 20000084  XER: 20000000
TASK = cb8289e0[0] 'swapper' THREAD: cb840000 CPU: 1
GPR00: d26ef318 cbfd7ae0 cb8289e0 00000043 00021000 ffffffff c1e90000 c1e96dec 
GPR08: 00000001 00021000 00277000 00000002 20000082 00000000 d27ee4dc d27ee46c 
GPR16: 00000000 c1658d8c d27ee5bc d27ee608 d27ee46c d27ee4dc d28f0000 c1e80000 
GPR24: d28f4be8 d27d85c4 0000001e 88888889 cbfd7af8 00000001 cadb5b20 cad863c0 
NIP [d26ef318] gclist_timeout+0x2ec/0x444 [umac]
LR [d26ef318] gclist_timeout+0x2ec/0x444 [umac]
Call Trace:
[cbfd7ae0] [d26ef318] gclist_timeout+0x2ec/0x444 [umac] (unreliable)
[cbfd7b70] [d26f2e28] ieee80211_timeout_stations+0x50/0xf40 [umac]
[cbfd7f30] [d26e9f44] ieee80211_get_extchan_info+0x7c/0x238 [umac]
[cbfd7f40] [c003cb2c] run_timer_softirq+0x12c/0x21c
[cbfd7fa0] [c0035c10] __do_softirq+0xe0/0x168
[cbfd7ff0] [c00105d0] call_do_softirq+0x14/0x24
[cb843e90] [c00048cc] do_softirq+0x94/0xa0
[cb843eb0] [c0004628] do_IRQ+0xf8/0x194
[cb843ee0] [c00112c4] ret_from_except+0x0/0x18
--- Exception: 501 at cpu_idle+0x9c/0xd8
    LR = cpu_idle+0x9c/0xd8
[cb843fa0] [c000923c] cpu_idle+0xc8/0xd8 (unreliable)
[cb843fc0] [c02ff620] start_secondary+0x2cc/0x2e4
[cb843ff0] [c0001d00] __secondary_start+0x30/0x84
Instruction dump:
7dc47378 7f26cb78 7de37b78 38a00214 4cc63182 480e1ccd 80964be8 80b80004 
3c60d27f 3863e634 4cc63182 480e1cb5 <0fe00000> 2f9d0000 419e0070 8137b0a4 

<4>ieee80211_node.c:529-gclist_timeout()-Forgetting ni=cad863c0 lost_nis=21 lost_skbs=21
<4>ieee80211_node.c:532-gclist_timeout()-Rebooting due to too many lost resources! lost_nis=21 lost_skbs=21


Also look for this in the logs:
ieee80211_node_ap.c:497-ieee80211_node_join()-AID too big!



 
Environment
  • identiFi wireless
  • Firmware 10.11.03
  • AP3825
  • Fresenius medical pump
Cause
Firmware bug
Resolution
Upgrade to 10.21.04 firmware
 
Additional notes
Problem only known on AP3825

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