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syslog "kernel: BUG: unable to handle kernel NULL pointer dereference" [message #10976] Sun, 11 March 2007 05:40
barf is currently offline  barf
Messages: 4
Registered: December 2006
Location: Christcurch, New Zealand
Junior Member
My OVZ server printed an EIP late last night when I ran my ip6tables
script. I'm no kernel hacker but thought someone on this list may want
to know.
My ip6tables command on both the HN and VE stopped working at the same
time. for example 'ip6tables -P INPUT DROP' just hangs but iptables
(IPv4) still works. Havn't rebooted yet in case I can help debug something.

baikonour:/etc/init.d# uname -a
Linux baikonour 2.6.18-028test010.1-ovz-smp #1 SMP Fri Jan 12 22:20:35
CET 2007 i686 GNU/Linux
baikonour:~# ip6tables -V
ip6tables v1.3.6
baikonour:~# cat /proc/version
Linux version 2.6.18-028test010.1-ovz-smp (root@build32.sarge.systs.org)
(gcc version 3.3.5 (Debian 1:3.3.5-13)) #1 SMP Fri Jan 12 22:20:35 CET 2007
baikonour:~# vzctl --version
vzctl version 3.0.14-1dso31.2


--- syslog messages follow ---
Mar 11 02:49:58 baikonour kernel: BUG: unable to handle kernel NULL
pointer dereference at virtual address 00000000
Mar 11 02:49:58 baikonour kernel: printing eip:
Mar 11 02:49:58 baikonour kernel: e0b2abe3
Mar 11 02:49:58 baikonour kernel: *pde = 00000000
Mar 11 02:49:58 baikonour kernel: Oops: 0000 [#1]
Mar 11 02:49:58 baikonour kernel: SMP
Mar 11 02:49:58 baikonour kernel: Modules linked in: ip6t_LOG
ip6table_filter ip6_tables bridge llc xt_mac ipt_LOG xt_state
iptable_nat nfs lockd sunrpc simfs vznetdev vzethdev vzrst ip_nat vzcpt
ip_conntrack vzdquota vzmon vzdev xt_tcpudp xt_length ipt_ttl xt_tcpmss
ipt_TCPMSS iptable_mangle iptable_filter xt_multiport xt_limit ipt_tos
ipt_REJECT ip_tables x_tables af_packet i2c_piix4 i2c_core shpchp
uhci_hcd usbcore 3c59x mii ide_cd cdrom
Mar 11 02:49:58 baikonour kernel: CPU: 1, VCPU: 101.0
Mar 11 02:49:58 baikonour kernel: EIP: 0060:[<e0b2abe3>] Not
tainted VLI
Mar 11 02:49:58 baikonour kernel: EFLAGS: 00010286
(2.6.18-028test010.1-ovz-smp #1)
Mar 11 02:49:58 baikonour kernel: EIP is at xt_find_table_lock+0x43/0xe0
[x_tables]
Mar 11 02:49:58 baikonour kernel: eax: c5fae800 ebx: 0000000a ecx:
00000000 edx: dca9b000
Mar 11 02:49:58 baikonour kernel: esi: 00000050 edi: 00000040 ebp:
bf940260 esp: cbb91dac
Mar 11 02:49:58 baikonour kernel: ds: 007b es: 007b ss: 0068
Mar 11 02:49:58 baikonour kernel: Process ip6tables (pid: 31695, veid:
101, ti=cbb90000 task=c5fae800 task.ti=cbb90000)
Mar 11 02:49:58 baikonour kernel: Stack: bf940260 cbb91f1c 00000040
00000040 bf940260 e0c21b85 0000000a cbb91e94
Mar 11 02:49:58 baikonour kernel: 00000020 c0198c0d cbb91de4
00000000 dcc5ae44 b7f91000 b7f91000 c0164f02
Mar 11 02:49:58 baikonour kernel: dcc5ae40 00000007 00000000
c140bcb4 00000000 00000000 c9a1f600 b7f91000
Mar 11 02:49:58 baikonour kernel: Call Trace:
Mar 11 02:49:58 baikonour kernel: [<e0c21b85>]
do_ip6t_get_ctl+0x135/0x310 [ip6_tables]
Mar 11 02:49:58 baikonour kernel: [<c0198c0d>] touch_atime+0x7d/0xe0
Mar 11 02:49:58 baikonour kernel: [<c0164f02>] zap_pte_range+0x102/0x300
Mar 11 02:49:58 baikonour kernel: [<c02b3373>] prio_tree_remove+0x83/0x100
Mar 11 02:49:58 baikonour kernel: [<c015b632>] prep_new_page+0x112/0x1d0
Mar 11 02:49:58 baikonour kernel: [<c01414d8>]
change_slab_charged+0x108/0x130
Mar 11 02:49:58 baikonour kernel: [<c0492479>] nf_sockopt+0xc9/0x140
Mar 11 02:49:58 baikonour kernel: [<c0492568>] nf_getsockopt+0x38/0x40
Mar 11 02:49:58 baikonour kernel: [<c04eee18>] ipv6_getsockopt+0xe8/0x110
Mar 11 02:49:58 baikonour kernel: [<c04724a3>]
sock_common_getsockopt+0x33/0x40
Mar 11 02:49:58 baikonour kernel: [<c046fa59>] sys_getsockopt+0x69/0xc0
Mar 11 02:49:58 baikonour kernel: [<c0470159>] sys_socketcall+0x229/0x260
Mar 11 02:49:58 baikonour kernel: [<c01158a0>] do_page_fault+0x0/0x510
Mar 11 02:49:58 baikonour kernel: [<c010311f>] syscall_call+0x7/0xb
Mar 11 02:49:58 baikonour kernel: Code: 89 f0 29 d8 8d 04 c2 e8 5c 08 9e
df 85 c0 ba fc ff ff ff 75 69 89 e0 25 00 e0 ff ff 8b 00 8b
90 8c 05 00 00 8b 8c da f8 08 00 00 <8b> 01 8d 74 26 00 8d 94 16 f8 08
00 00 39 d1 74 6d 89 34 24 89
Mar 11 02:49:58 baikonour kernel: EIP: [<e0b2abe3>]
xt_find_table_lock+0x43/0xe0 [x_tables] SS:ESP 0068:cbb91dac
--- end of relevant syslog entries ---


If I can provide you with any more relevant information to help let me know.
Or if I'm just retarded and broke it myself by setting the wrong limits
(quite possible) sorry!
-Stuart

--
Stuart MacIntosh
IT Consultancy & Technical Services
Phone: +64 21 2259576
Email: stuart@linuxsecurity.co.nz

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Re: syslog "kernel: BUG: unable to handle kernel NULL pointer dereference" [message #10981 is a reply to message #10976] Tue, 27 January 2004 21:04 Go to previous message
Vasily Tarasov is currently offline  Vasily Tarasov
Messages: 1345
Registered: January 2006
Senior Member
Hello, since 028test10 kernel a number of fixes were introduced in
iptables. Particularly, this patch is very pertinent:
http://git.openvz.org/?p=linux-2.6.18-openvz;a=commit;h=376c9a91a99f709082f60f701fd74f0887f2b97b

So, please, upgrade till recent kernel and inform us if the Ooops will
survive.

Thanks,
Vasily.

Stuart MacIntosh wrote:
> My OVZ server printed an EIP late last night when I ran my ip6tables
> script. I'm no kernel hacker but thought someone on this list may want
> to know.
> My ip6tables command on both the HN and VE stopped working at the same
> time. for example 'ip6tables -P INPUT DROP' just hangs but iptables
> (IPv4) still works. Havn't rebooted yet in case I can help debug something.
>
> baikonour:/etc/init.d# uname -a
> Linux baikonour 2.6.18-028test010.1-ovz-smp #1 SMP Fri Jan 12 22:20:35
> CET 2007 i686 GNU/Linux
> baikonour:~# ip6tables -V
> ip6tables v1.3.6
> baikonour:~# cat /proc/version
> Linux version 2.6.18-028test010.1-ovz-smp (root@build32.sarge.systs.org)
> (gcc version 3.3.5 (Debian 1:3.3.5-13)) #1 SMP Fri Jan 12 22:20:35 CET 2007
> baikonour:~# vzctl --version
> vzctl version 3.0.14-1dso31.2
>
>
> --- syslog messages follow ---
> Mar 11 02:49:58 baikonour kernel: BUG: unable to handle kernel NULL
> pointer dereference at virtual address 00000000
> Mar 11 02:49:58 baikonour kernel: printing eip:
> Mar 11 02:49:58 baikonour kernel: e0b2abe3
> Mar 11 02:49:58 baikonour kernel: *pde = 00000000
> Mar 11 02:49:58 baikonour kernel: Oops: 0000 [#1]
> Mar 11 02:49:58 baikonour kernel: SMP
> Mar 11 02:49:58 baikonour kernel: Modules linked in: ip6t_LOG
> ip6table_filter ip6_tables bridge llc xt_mac ipt_LOG xt_state
> iptable_nat nfs lockd sunrpc simfs vznetdev vzethdev vzrst ip_nat vzcpt
> ip_conntrack vzdquota vzmon vzdev xt_tcpudp xt_length ipt_ttl xt_tcpmss
> ipt_TCPMSS iptable_mangle iptable_filter xt_multiport xt_limit ipt_tos
> ipt_REJECT ip_tables x_tables af_packet i2c_piix4 i2c_core shpchp
> uhci_hcd usbcore 3c59x mii ide_cd cdrom
> Mar 11 02:49:58 baikonour kernel: CPU: 1, VCPU: 101.0
> Mar 11 02:49:58 baikonour kernel: EIP: 0060:[<e0b2abe3>] Not
> tainted VLI
> Mar 11 02:49:58 baikonour kernel: EFLAGS: 00010286
> (2.6.18-028test010.1-ovz-smp #1)
> Mar 11 02:49:58 baikonour kernel: EIP is at xt_find_table_lock+0x43/0xe0
> [x_tables]
> Mar 11 02:49:58 baikonour kernel: eax: c5fae800 ebx: 0000000a ecx:
> 00000000 edx: dca9b000
> Mar 11 02:49:58 baikonour kernel: esi: 00000050 edi: 00000040 ebp:
> bf940260 esp: cbb91dac
> Mar 11 02:49:58 baikonour kernel: ds: 007b es: 007b ss: 0068
> Mar 11 02:49:58 baikonour kernel: Process ip6tables (pid: 31695, veid:
> 101, ti=cbb90000 task=c5fae800 task.ti=cbb90000)
> Mar 11 02:49:58 baikonour kernel: Stack: bf940260 cbb91f1c 00000040
> 00000040 bf940260 e0c21b85 0000000a cbb91e94
> Mar 11 02:49:58 baikonour kernel: 00000020 c0198c0d cbb91de4
> 00000000 dcc5ae44 b7f91000 b7f91000 c0164f02
> Mar 11 02:49:58 baikonour kernel: dcc5ae40 00000007 00000000
> c140bcb4 00000000 00000000 c9a1f600 b7f91000
> Mar 11 02:49:58 baikonour kernel: Call Trace:
> Mar 11 02:49:58 baikonour kernel: [<e0c21b85>]
> do_ip6t_get_ctl+0x135/0x310 [ip6_tables]
> Mar 11 02:49:58 baikonour kernel: [<c0198c0d>] touch_atime+0x7d/0xe0
> Mar 11 02:49:58 baikonour kernel: [<c0164f02>] zap_pte_range+0x102/0x300
> Mar 11 02:49:58 baikonour kernel: [<c02b3373>] prio_tree_remove+0x83/0x100
> Mar 11 02:49:58 baikonour kernel: [<c015b632>] prep_new_page+0x112/0x1d0
> Mar 11 02:49:58 baikonour kernel: [<c01414d8>]
> change_slab_charged+0x108/0x130
> Mar 11 02:49:58 baikonour kernel: [<c0492479>] nf_sockopt+0xc9/0x140
> Mar 11 02:49:58 baikonour kernel: [<c0492568>] nf_getsockopt+0x38/0x40
> Mar 11 02:49:58 baikonour kernel: [<c04eee18>] ipv6_getsockopt+0xe8/0x110
> Mar 11 02:49:58 baikonour kernel: [<c04724a3>]
> sock_common_getsockopt+0x33/0x40
> Mar 11 02:49:58 baikonour kernel: [<c046fa59>] sys_getsockopt+0x69/0xc0
> Mar 11 02:49:58 baikonour kernel: [<c0470159>] sys_socketcall+0x229/0x260
> Mar 11 02:49:58 baikonour kernel: [<c01158a0>] do_page_fault+0x0/0x510
> Mar 11 02:49:58 baikonour kernel: [<c010311f>] syscall_call+0x7/0xb
> Mar 11 02:49:58 baikonour kernel: Code: 89 f0 29 d8 8d 04 c2 e8 5c 08 9e
> df 85 c0 ba fc ff ff ff 75 69 89 e0 25 00 e0 ff ff 8b 00 8b
> 90 8c 05 00 00 8b 8c da f8 08 00 00 <8b> 01 8d 74 26 00 8d 94 16 f8 08
> 00 00 39 d1 74 6d 89 34 24 89
> Mar 11 02:49:58 baikonour kernel: EIP: [<e0b2abe3>]
> xt_find_table_lock+0x43/0xe0 [x_tables] SS:ESP 0068:cbb91dac
> --- end of relevant syslog entries ---
>
>
> If I can provide you with any more relevant information to help let me know.
> Or if I'm just retarded and broke it myself by setting the wrong limits
> (quite possible) sorry!
> -Stuart
>
>

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