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AP is rebooting on 10.11 and 10.21 with multicast-to-unicast enabled on 2.4ghz

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Information

 
TitleAP is rebooting on 10.11 and 10.21 with multicast-to-unicast enabled on 2.4ghz
Symptoms
AP's are rebooting on 10.11 and 10.21 versions when multicast to unicast is enabled.  

AP crash report includes this log message:
Oops: Exception in kernel mode, sig: 5 [#1]
SMP NR_CPUS=2, CPU=0 P1010 RDB
last sysfs file: /sys/devices/system/cpu/online
Modules linked in: 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) bonding ap_drv(P) libeCrypto(P) m2Task(P) atherosHooks(P) prodenv(P)
NIP: ce325bf8 LR: ce325bf8 CTR: 00000001
REGS: cbfeba40 TRAP: 0700   Tainted: P             (2.6.35--10.21.03.0010+)
MSR: 00021000 <ME,CE>  CR: 20424084  XER: 20000000
TASK = c1744328[0] 'swapper' THREAD: c1758000 CPU: 0
GPR00: ce325bf8 cbfebaf0 c1744328 00000042 00021000 ffffffff c1770000 c1779dec 
GPR08: 00000001 00021000 00266000 00000001 20424082 00000000 c0ec0420 00000000 
GPR16: ce3cf10d ce3cf088 c0eb8d90 ce3cf4b8 ce3cf504 ce3cf088 ce3cf10d c1760000 
GPR24: ce3c0d6c 0000001e ce3e3c68 88888889 cbfebb08 00000001 00000000 ca859e48 
NIP [ce325bf8] gclist_timeout+0x2dc/0x430 [umac]
LR [ce325bf8] gclist_timeout+0x2dc/0x430 [umac]
Call Trace:
[cbfebaf0] [ce325bf8] gclist_timeout+0x2dc/0x430 [umac] (unreliable)
[cbfebb80] [ce327adc] ieee80211_timeout_stations+0x50/0xc70 [umac]
[cbfebf30] [ce31ff44] ieee80211_get_extchan_info+0x7c/0x27c [umac]
[cbfebf40] [c004e5f0] run_timer_softirq+0x12c/0x21c
[cbfebfa0] [c00476d4] __do_softirq+0xe0/0x168
[cbfebff0] [c0010648] call_do_softirq+0x14/0x24
[c175be90] [c00048cc] do_softirq+0x94/0xa0
[c175beb0] [c0004628] do_IRQ+0xf8/0x194
[c175bee0] [c001133c] ret_from_except+0x0/0x18
--- Exception: 501 at cpu_idle+0x9c/0xd8
    LR = cpu_idle+0x9c/0xd8
[c175bfa0] [c000923c] cpu_idle+0xc8/0xd8 (unreliable)
[c175bfc0] [c02e083c] start_kernel+0x2f8/0x30c
[c175bff0] [c00003c4] skpinv+0x2dc/0x318
Instruction dump:
7e048378 7f06c378 7e238b78 38a0021a 4cc63182 48096115 809a0028 80ba002c

 
Environment
  • IdentiFi
  • WS-AP3705, WS-AP3705, WS-AP3825
  • Version 10.11.04, 10.11.05, 10.21.02, 10.21.03
    • Multicast to Unicast feature enabled on 2.4ghz radio
Cause
There is a memory leak that is under investigation
Resolution
  • Disable Multicast-to-Unicast feature on AP's
  • Please contact GTAC to open a case for tracking
Additional notes

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