Hello, We have increased the number of devices in our test mesh configuration from 18 to 30 devices and have been seeing SKB_PANIC errors in our gateways.
We are using RT2x00 USB wi-fi module and below is the Kernel Trace. This problem seems to only occur under heavy traffic loads. I've seen similar reports of this behavior but do not know if the problem has been solved. Has anyone else seen this behavior? Thanks in advance! [ 576.258502] skbuff: skb_under_panic: text:bf913f85 len:198 put :20 head:de372c00 data:de372bfc tail:0xde372cc2 end:0xde372f40 dev:wlan0 [ 576.271412] ------------[ cut here ]------------ [ 576.276255] kernel BUG at net/core/skbuff.c:100! [ 576.281093] Internal error: Oops - BUG: 0 [#1] THUMB2 [ 576.286388] Modules linked in: tun ctr ccm bmp085_i2c sht21 tsl2550 ipt_MASQU ERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack ip_tables x_tables usb_f_acm u_serial g_serial libcomp osite omap_aes omap_sham evdev ti_am335x_adc kfifo_buf industrialio ath9k ath9k_ common ath9k_hw ath rt2800usb rt2x00usb rt2800lib rt2x00lib mac80211 cfg80211 crc_ccitt [ 576.323820] CPU: 0 PID: 0 Comm: swapper Not tainted 3.18.3-bone1 #1 [ 576.330391] task: c09e3128 ti: c09d6000 task.ti: c09d6000 [ 576.336062] PC is at skb_panic+0x4c/0x50 [ 576.340173] LR is at skb_panic+0x4d/0x50 [ 576.344283] pc : [<c04fbe2c>] lr : [<c04fbe2d>] psr: 20000133 [ 576.344283] sp : c09d7d20 ip : 00000000 fp : 00000000 [ 576.356321] r10: c09d7e24 r9 : c09d7dec r8 : c0696e2c [ 576.361796] r7 : de372cc2 r6 : de372bfc r5 : de328000 r4 : de372f40 [ 576.368638] r3 : 00000001 r2 : c0a0caec r1 : c0a05028 r0 : 0000007a [ 576.375483] Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA Thumb Segment kernel [ 576.383327] Control: 50c5387d Table: 9e324019 DAC: 00000015 [ 576.389350] Process swapper (pid: 0, stack limit = 0xc09d6238) [ 576.395464] Stack: (0xc09d7d20 to 0xc09d8000) [ 576.400033] 7d20: 00000014 de372c00 de372bfc de372cc2 de372f40 de328000 de372c00 c04fbe5d [ 576.408609] 7d40: 00000000 dd6b8718 dc84be80 dd66eac0 de010fa0 bf913f85 0000b0c5 5890dd7c [ 576.417185] 7d60: 000058c6 00000088 002000b2 00000002 00000000 00000003 00000023 00000001 [ 576.425762] 7d80: 00000001 00000000 00000000 00000000 dd66eac0 dc84be80 de010fa0 dc8ff3bc [ 576.434338] 7da0: de0103a0 bf9125af dd693a48 00000010 00000001 0000000c c09d7e24 c09d7e24 [ 576.442914] 7dc0: de0103a0 de328c80 dc8ff3bc 00004388 00000001 c09d7e24 00000000 bf89d4ef [ 576.451491] 7de0: 0000ff00 000000a2 00000000 dc8ff3bc dc84be80 dc84be80 00000000 de328502 [ 576.460067] 7e00: 000000a2 de0103a0 00000001 00000000 de010b8c bf89e98d 00000001 00000000 [ 576.468644] 7e20: 00000000 c09d7e24 c09d7e24 00000000 de0103a0 de328500 dc8ff000 dd692600 [ 576.477220] 7e40: 00000206 00000002 dc84be80 00000000 de0103a0 c09d7e7c de0103a0 00000000 [ 576.485797] 7e60: de010420 bf89fc93 bf8b8fe5 c09d7e90 00000000 c00638e9 ffffffff 7fffffff [ 576.494374] 7e80: 00000000 00200200 c0a05a28 00000000 c09fdd88 00000000 00000018 c09d6000 [ 576.502951] 7ea0: 00000100 00000007 c09d6000 c0034421 c0a871d8 00000006 00000040 c0033f01 [ 576.511527] 7ec0: 00000001 00015200 c0a6dc64 c0a871c0 c0a03418 c0a6dc10 c0a87180 00000009 [ 576.520103] 7ee0: c05d4230 00006be7 c0a05a28 00200000 00000000 c09d6018 00000010 00000000 [ 576.528680] 7f00: 00000000 de004000 c0a5a2f8 c0a02ed0 00000000 c00341a7 c0a311f4 c005ccab [ 576.537257] 7f20: 00000044 c0a31500 c09d7f50 c0b38f40 c0a6e428 c0008461 c000df79 c000df7a [ 576.545833] 7f40: 40000033 ffffffff c09d7f84 c05cac9b 00000000 00000000 ffffffed c001a121 [ 576.554410] 7f60: c09d6000 00000000 c09df0e4 00000000 c0a6e428 c0a5a2f8 c0a02ed0 00000000 [ 576.562987] 7f80: 00000010 c09d7f98 c000df79 c000df7a 40000033 ffffffff 00000000 c004d55f [ 576.571564] 7fa0: c09a21e0 dfeff480 c09d6000 c0a6d987 ffffffff ffffffff 00000000 c0961a41 [ 576.580141] 7fc0: ffffffff ffffffff c0961589 00000000 00000000 c09a21e0 c0a85ed4 c09df078 [ 576.588718] 7fe0: c09a21dc c09e4598 80004059 413fc082 00000000 80008079 00000000 00000000 [ 576.597307] [<c04fbe2c>] (skb_panic) from [<c04fbe5d>] (skb_push+0x2d/0x30) [ 576.604667] [<c04fbe5d>] (skb_push) from [<bf913f85>] (rt2x00queue_write_tx_frame+0xb4/0x2ac [rt2x00lib]) [ 576.614739] [<bf913f85>] (rt2x00queue_write_tx_frame [rt2x00lib]) from [<bf9125af>] (rt2x00mac_tx+0x5e/0x224 [rt2x00lib]) [ 576.626502] [<bf9125af>] (rt2x00mac_tx [rt2x00lib]) from [<bf89d4ef>] (__ieee80211_tx+0x19e/0x240 [mac80211]) [ 576.637056] [<bf89d4ef>] (__ieee80211_tx [mac80211]) from [<bf89e98d>] (ieee80211_tx+0x78/0x98 [mac80211]) [ 576.647318] [<bf89e98d>] (ieee80211_tx [mac80211]) from [<bf89fc93>] (ieee80211_tx_pending+0x7e/0x120 [mac80211]) [ 576.658157] [<bf89fc93>] (ieee80211_tx_pending [mac80211]) from [<c0034421>] (tasklet_action+0x41/0x68) [ 576.668014] [<c0034421>] (tasklet_action) from [<c0033f01>] (__do_softirq+0xc1/0x1bc) [ 576.676229] [<c0033f01>] (__do_softirq) from [<c00341a7>] (irq_exit+0x73/0xac) [ 576.683811] [<c00341a7>] (irq_exit) from [<c005ccab>] (__handle_domain_irq+0x3f/0x74) [ 576.692028] [<c005ccab>] (__handle_domain_irq) from [<c0008461>] (omap_intc_handle_irq+0x85/0x8c) [ 576.701346] [<c0008461>] (omap_intc_handle_irq) from [<c05cac9b>] (__irq_svc+0x3b/0x5c) [ 576.709738] Exception stack(0xc09d7f50 to 0xc09d7f98) [ 576.715032] 7f40: 00000000 00000000 ffffffed c001a121 [ 576.723609] 7f60: c09d6000 00000000 c09df0e4 00000000 c0a6e428 c0a5a2f8 c0a02ed0 00000000 [ 576.732184] 7f80: 00000010 c09d7f98 c000df79 c000df7a 40000033 ffffffff [ 576.739132] [<c05cac9b>] (__irq_svc) from [<c000df7a>] (arch_cpu_idle+0x2a/0x2c) [ 576.746895] [<c000df7a>] (arch_cpu_idle) from [<c004d55f>] (cpu_startup_entry+0x177/0x1b8) [ 576.755575] [<c004d55f>] (cpu_startup_entry) from [<c0961a41>] (start_kernel+0x321/0x32c) [ 576.764153] Code: 9703 9404 f0ca fd66 (de02) bf00 [ 576.769181] ---[ end trace 3e5d0ebf0952b4b1 ]--- [ 576.774019] Kernel panic - not syncing: Fatal exception in interrupt [ 576.780680] drm_kms_helper: panic occurred, switching back to text console [ 576.787908] ---[ end Kernel panic - not syncing: Fatal exception in interrupt
_______________________________________________ Devel mailing list [email protected] http://lists.open80211s.org/cgi-bin/mailman/listinfo/devel
