#20727: CPU 0 Unable to handle kernel paging request at virtual address
----------------------+---------------------------------------
Reporter: webtron | Owner: developers
Type: defect | Status: new
Priority: high | Milestone: Designated Driver (Trunk)
Component: kernel | Version: Trunk
Resolution: | Keywords:
----------------------+---------------------------------------
Old description:
> I'm getting this error a lot but it appears to be random. The AP needs a
> reboot to sort itself out but most cli commands give a seg fault error.
> These devices are remote so it's hard to access them when they do this
> and hence hard to debug. This is on OM2P-LC, UBNT Airrouters and tplink
> 740N all configured as dumb ap's. Trunk version 46434
>
> Sun Oct 11 20:56:39 2015 kern.alert kernel: [494175.337247] CPU 0 Unable
> to handle kernel paging request at virtual address 00500014, epc ==
> 80115378, ra == 8010a7c4
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.346640] Oops[#3]:
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.348852] CPU: 0 PID:
> 16277 Comm: rm Tainted: G D 4.1.2 #1
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.355705] task: 8182d420
> ti: 8182a000 task.ti: 8182a000
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.361163] $ 0 :
> 00000000 fffffff8 8108eca4 8108a560
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.366459] $ 4 :
> 834217f8 8182bdf8 8182bd90 00000000
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.371753] $ 8 :
> 00000010 00bed9ac 8268b380 00000000
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.377048] $12 :
> 7fb0ed90 00000000 00000000 00000000
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.382344] $16 :
> 00500000 834217f8 8182bdf8 00000000
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.387638] $20 :
> 0000000b 4d600a38 82648019 77fd6000
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.392934] $24 :
> 00000000 8016c130
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.398230] $28 :
> 8182a000 8182bcf8 00000000 8010a7c4
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.403525] Hi :
> 000001cb
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.406477] Lo :
> 00001e75
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.409454] epc :
> 80115378 __d_lookup+0x78/0x150
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.414311] ra :
> 8010a7c4 lookup_fast+0x1f8/0x31c
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.419324] Status:
> 1000f403 KERNEL EXL IE
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.423576] Cause :
> 00800008
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.426529] BadVA :
> 00500014
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.429481] PrId :
> 00019374 (MIPS 24Kc)
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.433471] Modules linked
> in: ath9k ath9k_common iptable_nat ebtable_nat ebtable_filter
> ebtable_broute ath9k_hw ath nf_nat_ipv4 nf_conntrack_ipv4 mac80211
> iptable_mangle iptable_filter ipt_REJECT ipt_MASQUERADE ip_tables
> ebtables ebt_vlan ebt_stp ebt_redirect ebt_pkttype ebt_mark_m ebt_mark
> ebt_limit ebt_among ebt_802_3 cfg80211 xt_time xt_tcpudp xt_nat
> xt_multiport xt_mark xt_mac xt_limit xt_id xt_comment xt_TCPMSS
> xt_REDIRECT xt_LOG x_tables nf_reject_ipv4 Sun Oct 11 20:56:39 2015
> kern.warn kernel: [494175.493900] Process rm (pid: 16277,
> threadinfo=8182a000, task=8182d420, tls=77fe3644)
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.501787] Stack :
> 82648019 8268b000 fffffff6 8182bdf0 ffffffec 82648019 8182bdf0 8182bdf0
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.501787]
> 8182bd88 00000001 8182bed0 8182bd90 83a84910 8010a7c4 83a84910 834217f8
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.501787]
> 83afcca0 83464e58 00000001 81082214 8182bdf0 8182bdf0 00000000 ffffff9c
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.501787]
> 8182bed0 ffffff69 7fb0ef84 77fd6000 00000000 8010c604 00000013 800ceb00
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.501787]
> 00000000 00000cd4 81007ee0 8340c0d4 8182be1c 81007ee0 00000000 00000000
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.501787] ...
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.537293] Call Trace:
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.539822] [<80115378>]
> __d_lookup+0x78/0x150
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.544342] [<8010a7c4>]
> lookup_fast+0x1f8/0x31c
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.549027] [<8010c604>]
> path_lookupat+0xe0/0x710
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.553802] [<8010cc64>]
> filename_lookup+0x30/0x9c
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.558665] [<8010e194>]
> user_path_at_empty+0x64/0xa4
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.563784] [<8010e1e8>]
> user_path_at+0x14/0x20
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.568382] [<80104104>]
> vfs_fstatat+0x64/0xd0
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.572897] [<80104728>]
> SyS_lstat64+0x18/0x3c
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.577417] [<80062b3c>]
> handle_sys+0x11c/0x140
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.582003]
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.583559]
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.583559] Code: 8c500000
> 1200002c 00009821 <8e020014> 14550027 00000000 8e020008 14510024
> 00000000
> Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.593695] ---[ end trace
> bc81ea644298e349 ]---
New description:
I'm getting this error a lot but it appears to be random. The AP needs a
reboot to sort itself out but most cli commands give a seg fault error.
These devices are remote so it's hard to access them when they do this and
hence hard to debug. This is on OM2P-LC, UBNT Airrouters and tplink 740N
all configured as dumb ap's. Trunk version 46434
{{{
Sun Oct 11 20:56:39 2015 kern.alert kernel: [494175.337247] CPU 0 Unable
to handle kernel paging request at virtual address 00500014, epc ==
80115378, ra == 8010a7c4
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.346640] Oops[#3]:
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.348852] CPU: 0 PID:
16277 Comm: rm Tainted: G D 4.1.2 #1
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.355705] task: 8182d420
ti: 8182a000 task.ti: 8182a000
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.361163] $ 0 :
00000000 fffffff8 8108eca4 8108a560
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.366459] $ 4 :
834217f8 8182bdf8 8182bd90 00000000
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.371753] $ 8 :
00000010 00bed9ac 8268b380 00000000
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.377048] $12 :
7fb0ed90 00000000 00000000 00000000
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.382344] $16 :
00500000 834217f8 8182bdf8 00000000
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.387638] $20 :
0000000b 4d600a38 82648019 77fd6000
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.392934] $24 :
00000000 8016c130
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.398230] $28 :
8182a000 8182bcf8 00000000 8010a7c4
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.403525] Hi :
000001cb
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.406477] Lo :
00001e75
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.409454] epc :
80115378 __d_lookup+0x78/0x150
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.414311] ra :
8010a7c4 lookup_fast+0x1f8/0x31c
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.419324] Status:
1000f403 KERNEL EXL IE
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.423576] Cause :
00800008
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.426529] BadVA :
00500014
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.429481] PrId :
00019374 (MIPS 24Kc)
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.433471] Modules linked
in: ath9k ath9k_common iptable_nat ebtable_nat ebtable_filter
ebtable_broute ath9k_hw ath nf_nat_ipv4 nf_conntrack_ipv4 mac80211
iptable_mangle iptable_filter ipt_REJECT ipt_MASQUERADE ip_tables ebtables
ebt_vlan ebt_stp ebt_redirect ebt_pkttype ebt_mark_m ebt_mark ebt_limit
ebt_among ebt_802_3 cfg80211 xt_time xt_tcpudp xt_nat xt_multiport xt_mark
xt_mac xt_limit xt_id xt_comment xt_TCPMSS xt_REDIRECT xt_LOG x_tables
nf_reject_ipv4 Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.493900]
Process rm (pid: 16277, threadinfo=8182a000, task=8182d420, tls=77fe3644)
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.501787] Stack :
82648019 8268b000 fffffff6 8182bdf0 ffffffec 82648019 8182bdf0 8182bdf0
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.501787] 8182bd88
00000001 8182bed0 8182bd90 83a84910 8010a7c4 83a84910 834217f8
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.501787] 83afcca0
83464e58 00000001 81082214 8182bdf0 8182bdf0 00000000 ffffff9c
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.501787] 8182bed0
ffffff69 7fb0ef84 77fd6000 00000000 8010c604 00000013 800ceb00
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.501787] 00000000
00000cd4 81007ee0 8340c0d4 8182be1c 81007ee0 00000000 00000000
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.501787] ...
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.537293] Call Trace:
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.539822] [<80115378>]
__d_lookup+0x78/0x150
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.544342] [<8010a7c4>]
lookup_fast+0x1f8/0x31c
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.549027] [<8010c604>]
path_lookupat+0xe0/0x710
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.553802] [<8010cc64>]
filename_lookup+0x30/0x9c
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.558665] [<8010e194>]
user_path_at_empty+0x64/0xa4
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.563784] [<8010e1e8>]
user_path_at+0x14/0x20
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.568382] [<80104104>]
vfs_fstatat+0x64/0xd0
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.572897] [<80104728>]
SyS_lstat64+0x18/0x3c
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.577417] [<80062b3c>]
handle_sys+0x11c/0x140
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.582003]
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.583559]
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.583559] Code: 8c500000
1200002c 00009821 <8e020014> 14550027 00000000 8e020008 14510024
00000000
Sun Oct 11 20:56:39 2015 kern.warn kernel: [494175.593695] ---[ end trace
bc81ea644298e349 ]---
}}}
--
Comment (by florian):
Are you doing specific filesystem operations when this crash occurs? It
could be pretty much anything involving reading/writing to/from flash or
an externally attached medium.
--
Ticket URL: <https://dev.openwrt.org/ticket/20727#comment:1>
OpenWrt <http://openwrt.org>
Opensource Wireless Router Technology
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