[linux-3.12.19] - kernel panic observed

[linux-3.12.19] - kernel panic observed

[Sriram]

Hi,

I m working on linux-3.12.19 kernel. In our board, we have an IPsec tunnel
which carries IPv6 traffic inside

Packet structure looks like below,

IPv4(OuterIP)  || ESP || IPv6(Inner IP) || IPv6 Frag HDR || UDP || Payload.


I have written an application which constructs Inner IPv6 packets and
writes to raw socket. Through application I m generating IPv6 packets of
length not more than 1340. If length of the IPv6 packet is more than 1340,
application does the IPv6 fragmentation and 2 fragments are written to raw
socket. If I run this application using a script continously, there is no
issue observed for around 30-40 mins. After that we see kernel panic with
the stack trace like below.

Unable to handle kernel paging request for data at address 0x000004d0
Faulting instruction address: 0xc000000000789578
Oops: Kernel access of bad area, sig: 11 [#1]
SMP NR_CPUS=24 CoreNet Generic
Modules linked in: shm(O) l1d(O) hetmgr(O) sl_reset(O) cu_led(O) airv1588(O)
CPU: 7 PID: 2512 Comm: pdcpUlSockTh Tainted: G        W  O 3.12.19-rt30 #1
task: c0000003fb42dc40 ti: c0000003ef9a0000 task.ti: c0000003ef9a0000
NIP: c000000000789578 LR: c00000000078ca48 CTR: c00000000078c8f0
REGS: c0000003ef9a2f10 TRAP: 0300   Tainted: G        W  O  (3.12.19-rt30)
MSR: 0000000080029000 <CE,EE,ME>  CR: 24008422  XER: 20000000
SOFTE: 1
DEAR: 00000000000004d0, ESR: 0000000000000100

GPR00: c00000000078ca48 c0000003ef9a3190 c000000000d6b3a0 c0000003ef9a33a0
GPR04: 0000000000000000 c0000003ef9a3740 000000000000000a c0000003ef9f1c80
GPR08: c0000003ef9f1c80 00000000000004d0 0000000000000001 000000007abc6dbb
GPR12: 0000019f1a2654f8 c00000000fff7480 00000000107ce2ec 000000001075fc10
GPR16: 0000000000000011 c000000000d56200 0000000000000000 000000001d8a2000
GPR20: 0000000000000000 0000000000000040 c000000000e74b48 c0000003ef9a3200
GPR24: c000000000cbc480 c0000003ef9a3740 c0000003ef9a33a0 c0000003ef9a3740
GPR28: 000000000000000a c000000074b86000 c0000003ef9f1c80 000000000000000a
NIP [c000000000789578] .xfrm_resolve_and_create_bundle+0x78/0xbb4
LR [c00000000078ca48] .xfrm_bundle_lookup+0x158/0x6f8
Call Trace:
[c0000003ef9a3190] [c0000003ef9a32c0] 0xc0000003ef9a32c0 (unreliable)
[c0000003ef9a3330] [c00000000078ca48] .xfrm_bundle_lookup+0x158/0x6f8
[c0000003ef9a3400] [c0000000006d1a9c] .flow_cache_lookup+0x43c/0x4f4
[c0000003ef9a34e0] [c00000000078d348] .xfrm_lookup+0x260/0x6a4
[c0000003ef9a3610] [c0000000007a7edc] .ip6_dst_lookup_flow+0x8c/0xc0
[c0000003ef9a36b0] [c0000000007ca3d0] .rawv6_sendmsg+0x264/0xcc8
[c0000003ef9a3820] [c000000000758c18] .inet_sendmsg+0x98/0x110
[c0000003ef9a38c0] [c000000000694124] .sock_sendmsg+0x94/0xf4
[c0000003ef9a3a20] [c000000000694738] .___sys_sendmsg+0x340/0x350
[c0000003ef9a3c20] [c0000000006990c8] .__sys_sendmsg+0x58/0xb4
[c0000003ef9a3d00] [c0000000006dac94] .compat_sys_sendmsg+0x48/0x70
[c0000003ef9a3d90] [c0000000006db228] .compat_sys_socketcall+0x2b4/0x310
[c0000003ef9a3e30] [c0000000000005a4] syscall_exit+0x0/0x8c
Instruction dump:
fbc1fff0 fbe1fff8 f821fe61 7c7a1b78 7cdf3378 7c942378 7cb92b78 7cfe3b78
60000000 60000000 e93a0000 3ae10070 <e9290000> 7f43d378 7e84a378 7f25cb78

Kindly let me know if there is any patch available to fix this issue.
If further details are required, I can post.

Regards,
Sriram
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[linux-3.12.19] - kernel panic observed

[Greg KH]

On Tue, Jul 10, 2018 at 12:08:25PM +0530, Sriram wrote:
> Hi,
> 
> I m working on linux-3.12.19 kernel.

Wow that is old.  And unsupported and obsolete and very very very
insecure.  Please work on updating to a newer kernel version that the
community can help you out with (like 4.14 or 4.17).

If you are stuck at this old kernel version for a specific reason, then
please work with the company that is forcing this to happen, as you are
already paying them for support for these types of issues.  There's
nothing the community can to do help you out with a kernel version from
2013.

Best of luck!

greg k-h

[linux-3.12.19] - kernel panic observed

[ozgur at goosey.org]

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[linux-3.12.19] - kernel panic observed

[valdis.kletnieks at vt.edu]

On Tue, 10 Jul 2018 12:08:25 +0530, Sriram said:
> I m working on linux-3.12.19 kernel.

You have our condolences.  Note that the fix for your problem has
probably already been found, somewhere in the millions of lines of
changes since then.

[/usr/src/linux-next] git diff --shortstat v3.12 next-20180710
 64362 files changed, 12400150 insertions(+), 4758460 deletions(-)

If finding the fix in all that is too difficult for you, complain to the vendor who
you're paying to support that kernel.

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