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Cisco Bug: CSCvt39042 - Cisco 1815i AP reloads unexpectedly with - PC is at pskb_expand_head+0x44/0x2f4

Last Modified

Jun 03, 2020

Products (1)

  • Cisco Aironet 1850 Series Access Points

Known Affected Releases

8.10(112.0) 8.10(121.0)

Description (partial)

Symptom:
Randomly, an 1815I AP will reboot without generating any crash file or coredump.
Syslogs on the AP would show the crash occurring indicating the following -

Mar  4 10:32:50 kernel: [03/04/2020 10:32:48.8099] kernel BUG at /data/BUILD/810_MR1_ME_CCO_rebuild/mallorca/router/kernel/linux-qca-3.14/net/core/skbuff.c:1228!
Mar  4 10:32:50 kernel: [03/04/2020 10:32:48.8099] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP ARM
Mar  4 10:32:50 kernel: [03/04/2020 10:32:48.8099] Modules linked in: ath_pktlog(P) ath_dev(P) ath_rate_atheros(P) ath_hal(P) umac ath_spectral(P) ath_dfs(P) adf(P) asf(P) mem_manager(P) reed_solomon psnap p8022 archivefs act2_driver stp llc ipv6 elts_
Mar  4 10:32:50 kernel: [03/04/2020 10:32:48.8099] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.14.43 #1
Mar  4 10:32:50 kernel: [03/04/2020 10:32:48.8099] task: 80865d18 ti: 8085a000 task.ti: 8085a000
Mar  4 10:32:50 kernel: [03/04/2020 10:32:48.8099] PC is at pskb_expand_head+0x44/0x2f4
Mar  4 10:32:50 kernel: [03/04/2020 10:32:48.8099] LR is at hif_completion_thread+0x1a0/0x2c4 [umac]
Mar  4 10:32:50 kernel: [03/04/2020 10:32:48.8099] pc : [<805e08f0>]    lr : [<7fd433e8>]    psr: 20000113\x0asp : 8085bd08  ip : 8085bd38  fp : 8085bd34
Mar  4 10:32:50 kernel: [03/04/2020 10:32:48.8099] r10: 00000000  r9 : bd7f7d00  r8 : bca4e81c
Mar  4 10:32:50 kernel: [03/04/2020 10:32:48.8099] r7 : 00000000  r6 : bca4e800  r5 : 00000020  r4 : ac73ff00
Mar  4 10:32:50 kernel: [03/04/2020 10:32:48.8099] r3 : 00000404  r2 : 000000e0  r1 : 00000000  r0 : ac73ff00
Mar  4 10:32:51 kernel: [*03/04/2020 10:32:48.8099] Re-Tx Count=2, Max Re-Tx Value=5, SendSeqNum=229, NumofPendingMsgs=1
Mar  4 10:32:51 kernel: [*03/04/2020 10:32:48.8099]

Conditions:
AP 1815I running normally. Crash can occur around 3 times a day.
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