Kernel error

Kernel error

[Saurabh Jain]

Hi Guys,

I am getting the following kernel error while doing some experiments.
Any idea where things are going wrong. To me it looks like there is an
error while copying data from user space to kernel space. The
application which i am running is iperf. However i also have netem
module for emulating some wide area network characteristics like
delay. I am using delay of 100ms.

##################Error Message#############################
Unable to handle kernel NULL pointer dereference at virtual address 00000004
 printing eip:
c02fee3c
*pde = 7ded4067
Oops: 0002 [#5]
Modules linked in: setparam(U) sch_netem(U) nfs(U) lockd(U) autofs4(U)
sunrpc(U)CPU:    0
EIP:    0060:[<c02fee3c>]    Not tainted VLI
EFLAGS: 00010286   (2.6.12-1.1390_FC4-emulab-1)
EIP is at tcp_transmit_skb+0x3ef/0x8de
eax: 00000000   ebx: f71a1a40   ecx: ed64f960   edx: ed64ff60
esi: 00000000   edi: f2f98500   ebp: ed71b780   esp: f47bddd4
ds: 007b   es: 007b   ss: 0068
Process iperf (pid: 2443, threadinfo=f47bc000 task=f71a1a40)
Stack: f2f9854c c02d1019 ed71b7b8 f2f98500 ed15cc80 00000282 ed71b780 00000100
       c02ce99f f71a1a40 f2f98500 f71a1a40 00000000 f2f98500 f2f9854c c02f53ad
       00000000 ed335db8 f2f98500 f2f98500 f47bdeb8 00000000 00000000 002ce99f
Call Trace:
 [<c02d1019>] skb_copy_datagram_iovec+0x180/0x1f8
 [<c02ce99f>] alloc_skb+0x31/0xc1
 [<c02f53ad>] tcp_recvmsg+0x2b1/0x74e
 [<c02fd83f>] tcp_rcv_established+0x5d2/0x77a
 [<c02ce2e0>] sock_common_recvmsg+0x41/0x57
 [<c02cb052>] sock_aio_read+0xf9/0x12b
 [<c014fccb>] do_sync_read+0x9e/0xec
 [<c01291ae>] autoremove_wake_function+0x0/0x37
 [<c014fe23>] vfs_read+0x10a/0x10e
 [<c0150064>] sys_read+0x41/0x6a
 [<c0102d29>] syscall_call+0x7/0xb
Code: a1 04 07 39 c0 e8 c0 e5 e3 ff 89 c2 85 c0 74 2d 83 87 08 04 00 00 01 8b 8
#############################################################

Thanks in advance

Re: Kernel error

[Stephen Hemminger]

On Sun, 16 Apr 2006 01:43:08 -0500
"Saurabh Jain" <jassduec@gmail.com> wrote:

> Hi Guys,
> 
> I am getting the following kernel error while doing some experiments.
> Any idea where things are going wrong. To me it looks like there is an
> error while copying data from user space to kernel space. The
> application which i am running is iperf. However i also have netem
> module for emulating some wide area network characteristics like
> delay. I am using delay of 100ms.
> 
> ##################Error Message#############################
> Unable to handle kernel NULL pointer dereference at virtual address 00000004
>  printing eip:
> c02fee3c
> *pde = 7ded4067
> Oops: 0002 [#5]
> Modules linked in: setparam(U) sch_netem(U) nfs(U) lockd(U) autofs4(U)
> sunrpc(U)CPU:    0
> EIP:    0060:[<c02fee3c>]    Not tainted VLI
> EFLAGS: 00010286   (2.6.12-1.1390_FC4-emulab-1)
> EIP is at tcp_transmit_skb+0x3ef/0x8de
> eax: 00000000   ebx: f71a1a40   ecx: ed64f960   edx: ed64ff60
> esi: 00000000   edi: f2f98500   ebp: ed71b780   esp: f47bddd4
> ds: 007b   es: 007b   ss: 0068
> Process iperf (pid: 2443, threadinfo=f47bc000 task=f71a1a40)
> Stack: f2f9854c c02d1019 ed71b7b8 f2f98500 ed15cc80 00000282 ed71b780 00000100
>        c02ce99f f71a1a40 f2f98500 f71a1a40 00000000 f2f98500 f2f9854c c02f53ad
>        00000000 ed335db8 f2f98500 f2f98500 f47bdeb8 00000000 00000000 002ce99f
> Call Trace:
>  [<c02d1019>] skb_copy_datagram_iovec+0x180/0x1f8
>  [<c02ce99f>] alloc_skb+0x31/0xc1
>  [<c02f53ad>] tcp_recvmsg+0x2b1/0x74e
>  [<c02fd83f>] tcp_rcv_established+0x5d2/0x77a
>  [<c02ce2e0>] sock_common_recvmsg+0x41/0x57
>  [<c02cb052>] sock_aio_read+0xf9/0x12b
>  [<c014fccb>] do_sync_read+0x9e/0xec
>  [<c01291ae>] autoremove_wake_function+0x0/0x37
>  [<c014fe23>] vfs_read+0x10a/0x10e
>  [<c0150064>] sys_read+0x41/0x6a
>  [<c0102d29>] syscall_call+0x7/0xb
> Code: a1 04 07 39 c0 e8 c0 e5 e3 ff 89 c2 85 c0 74 2d 83 87 08 04 00 00 01 8b 8
> #############################################################

Please provide full info: kernel version and configuration as well
as hardware information (lspci).
Since it looks like a Fedora Core kernel, you may have to ask the fedora
list.

Re: kernel Error

[Michal Piotrowski]

Hi,

[netdev added to CC]

umesh@websurfer.com.np pisze:
> I got following error message when I try to upload file to remote server.
> The log generated in remote server is as per below.
> 
> KERNEL: assertion (flags & MSG_PEEK) failed at net/ipv4/tcp.c (1284)
> recvmsg bug: copied BC00D548 seq BC00DAFC
> KERNEL: assertion (tp->copied_seq == tp->rcv_nxt || (flags & (MSG_PEEK |
> MSG_TRUNC))) failed at net/ipv4/tcp.c (1348)
> KERNEL: assertion (flags & MSG_PEEK) failed at net/ipv4/tcp.c (1284)
> recvmsg bug: copied BC00D548 seq BC00DAFC
> KERNEL: assertion (tp->copied_seq == tp->rcv_nxt || (flags & (MSG_PEEK |
> MSG_TRUNC))) failed at net/ipv4/tcp.c (1348)
> KERNEL: assertion (flags & MSG_PEEK) failed at net/ipv4/tcp.c (1284)
> 
> Umesh
> 

Please read REPORTING-BUGS and send more details

Regards,
Michal

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