[OpenWrt-Devel] AA on brcm47xx: Unhandled kernel unaligned access

[Nikolai Zhubr]

15.07.2014 1:42, Jonas Gorski:
[...]
>> or
>> bw32(bp, B44_RXMAXLEN, bp->dev->mtu + ETH_HLEN + 8) ?
>
> This is the right one; mtu (the "payload") + ETH_HLEN (14 bytes) + 8
> (4 bytes for vlan tag, probably 4 extra bytes for custom header
> optionally used by broadcom switches)

Ok, tested this. Unfortunately it's still panicing under load (and 
seemingly this change made no difference whatsoever):


[  271.210000] ------------[ cut here ]------------
[  271.220000] WARNING: at net/core/dev.c:2194 
skb_warn_bad_offload+0xc0/0xe8()
[  271.220000] b44: caps=(0x0000000000004000, 0x0000000000000000) 
len=377 data_len=0 gso_size=57048 gso_type=32506 ip_summed=0
[  271.240000] Modules linked in: pppoe ppp_async iptable_nat b43legacy 
b43 pppox ppp_generic nf_nat_ipv4 nf_conntrack_ipv4 mac80211 
ipt_MASQUERADE cfg80211 xt_time xt_tcpudp xt_state xt_nat xt_multiport 
xt_mark xt_mac xt_limit xt_conntrack xt_comment xt_TCPMSS xt_REDIRECT 
xt_LOG xt_CT slhc nf_nat_irc nf_nat_ftp nf_nat nf_defrag_ipv4 
nf_conntrack_irc nf_conntrack_ftp iptable_raw iptable_mangle 
iptable_filter ipt_REJECT ip_tables crc_ccitt compat ip6t_REJECT 
ip6table_raw ip6table_mangle ip6table_filter ip6_tables x_tables 
nf_conntrack_ipv6 nf_conntrack nf_defrag_ipv6 ipv6 arc4 crypto_blkcipher 
leds_gpio gpio_button_hotplug tg3 hwmon bgmac b44 ptp pps_core
[  271.300000] CPU: 0 PID: 3 Comm: ksoftirqd/0 Not tainted 3.10.44 #2
[  271.300000] Stack : 00000000 00000000 00000000 00000000 8030d552 
00000036 818201d0 00000008
	  80272688 802bf23b 00000003 8030cd00 818201d0 00000008 802bb6e4 00000000
	  802bb6dc 8001c204 00000003 80019bc4 80299520 00000008 80273f28 8182bc5c
	  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
	  00000000 00000000 00000000 00000000 00000000 00000000 00000000 8182bbe8
	  ...
[  271.340000] Call Trace:
[  271.340000] [<80010ca0>] show_stack+0x48/0x70
[  271.350000] [<80019cc0>] warn_slowpath_common+0x78/0xa8
[  271.350000] [<80019d1c>] warn_slowpath_fmt+0x2c/0x38
[  271.360000] [<801b2d10>] skb_warn_bad_offload+0xc0/0xe8
[  271.360000] [<801b68c4>] __skb_gso_segment+0x50/0xec
[  271.370000] [<801de5bc>] ip_forward_finish+0x108/0x1bc
[  271.370000] [<801b3da0>] __netif_receive_skb_core+0x46c/0x52c
[  271.380000] [<81ad41d4>] 0x81ad41d4
[  271.380000]
[  271.380000] ---[ end trace b4f0aa7175b12bf7 ]---
[  271.390000] Unhandled kernel unaligned access[#1]:
[  271.390000] CPU: 0 PID: 3 Comm: ksoftirqd/0 Tainted: G        W 
3.10.44 #2
[  271.390000] task: 81820028 ti: 8182a000 task.ti: 8182a000
[  271.390000] $ 0   : 00000000 00000001 81696a48 00000028
[  271.390000] $ 4   : 2d37d9ee 00000000 00007088 00000000
[  271.390000] $ 8   : 0000002d 35373137 62323162 5d203766
[  271.390000] $12   : 00000000 03bf0000 00000000 bc000000
[  271.390000] $16   : 80e7fec0 00000001 00000001 00000014
[  271.390000] $20   : 00000000 00000008 802bb6e4 00000000
[  271.390000] $24   : 00000003 80150bcc
[  271.390000] $28   : 8182a000 8182bd28 802bb6dc 801ab22c
[  271.390000] Hi    : 00000000
[  271.390000] Lo    : 00000083
[  271.390000] epc   : 80064440 put_page+0x0/0x4c
[  271.390000]     Tainted: G        W
[  271.390000] ra    : 801ab22c skb_release_data+0xc4/0x118
[  271.390000] Status: 1000b803	KERNEL EXL IE
[  271.390000] Cause : 00800010
[  271.390000] BadVA : 2d37d9ee
[  271.390000] PrId  : 00029006 (Broadcom BMIPS3300)
[  271.390000] Modules linked in: pppoe ppp_async iptable_nat b43legacy 
b43 pppox ppp_generic nf_nat_ipv4 nf_conntrack_ipv4 mac80211 
ipt_MASQUERADE cfg80211 xt_time xt_tcpudp xt_state xt_nat xt_multiport 
xt_mark xt_mac xt_limit xt_conntrack xt_comment xt_TCPMSS xt_REDIRECT 
xt_LOG xt_CT slhc nf_nat_irc nf_nat_ftp nf_nat nf_defrag_ipv4 
nf_conntrack_irc nf_conntrack_ftp iptable_raw iptable_mangle 
iptable_filter ipt_REJECT ip_tables crc_ccitt compat ip6t_REJECT 
ip6table_raw ip6table_mangle ip6table_filter ip6_tables x_tables 
nf_conntrack_ipv6 nf_conntrack nf_defrag_ipv6 ipv6 arc4 crypto_blkcipher 
leds_gpio gpio_button_hotplug tg3 hwmon bgmac b44 ptp pps_core
[  271.390000] Process ksoftirqd/0 (pid: 3, threadinfo=8182a000, 
task=81820028, tls=00000000)
[  271.390000] Stack : 80e7fec0 801ab294 80e7fec0 00007088 00000000 
80e7fec0 ffffffea 801ab2d0
	  802bb6e4 80e7fec0 80e5da40 00000001 80e7fec0 801de5d4 00000850 80f72ac0
	  81b68000 801de4b4 00000001 801aa3e4 802bca98 802bca98 802bb6d0 81abc000
	  80e7fec0 801b3da0 00000042 81ad0964 81b7df20 801aa3e4 802bb6e4 8018e658
	  0000010a 000001f1 81abc3e8 81abc3c0 00000042 80e7fec0 00000017 00000187
	  ...
[  271.390000] Call Trace:
[  271.390000] [<80064440>] put_page+0x0/0x4c
[  271.390000] [<801ab22c>] skb_release_data+0xc4/0x118
[  271.390000] [<801ab2d0>] __kfree_skb+0x14/0xd4
[  271.390000] [<801de5d4>] ip_forward_finish+0x120/0x1bc
[  271.390000] [<801b3da0>] __netif_receive_skb_core+0x46c/0x52c
[  271.390000] [<81ad41d4>] 0x81ad41d4
[  271.390000]
[  271.390000]
Code: 3c058006  080190c9  24a538e4 <8c820000> 3042c000  10400003 
00801821  08018fa0  00000000
[  271.630000] ---[ end trace b4f0aa7175b12bf8 ]---
[  271.640000] Kernel panic - not syncing: Fatal exception in interrupt
[  271.640000] Rebooting in 3 seconds..



>
>> or maybe even
>> bw32(bp, B44_RXMAXLEN, bp->dev->mtu) ?
>>
>> Apology for my ignorance, just can't stand testing it immediately to
>> hopefully get it right for BB.
>>
>>
>> Thank you.
>> Nikolai
>
> Thanks for testing!
>
>
> Jonas
>
> .
>
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