linux-kernel - Re: linux-next: powerpc boot failure

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Message-ID: <o2s12c511ca1004081155o9b28c9f5hdfadd075913f1fcf@mail.gmail.com>
Date:	Thu, 8 Apr 2010 11:55:34 -0700
From:	Tony Luck <tony.luck@...el.com>
To:	Timo Teräs <timo.teras@....fi>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: linux-next: powerpc boot failure

I'm seeing an oops in the same routine on ia64 built from next-20100408

My setup is a SLES11 installation.  next-20100407 booted with no problems.
I'm also clueless about xfrm_policy.

Here's an abbreviated copy of the first (of several) oops.  The code
dereferences a bad pointer:

Unable to handle kernel paging request at virtual address 480cb78f00000024
mount.nfs[7289]: Oops 8821862825984 [1]
Modules linked in: nfs lockd auth_rpcgss sunrpc binfmt_misc loop
dm_mod sr_mod usb_storage sg button container usbhid uhci_hcd ehci_hcd
usbcore fan processor thermal thermal_sys

Pid: 7289, CPU 16, comm:            mount.nfs
psr : 0000101008526030 ifs : 8000000000000e22 ip  :
[<a000000100888f10>]    Not tainted
(2.6.34-rc3-generic-smp-next-20100408)
ip is at __xfrm_lookup+0x650/0x760

Call Trace:
 [<a000000100015950>] show_stack+0x50/0xa0
 [<a0000001000161c0>] show_regs+0x820/0x860
 [<a00000010003ac00>] die+0x1a0/0x300
 [<a000000100068b40>] ia64_do_page_fault+0x8c0/0x9e0
 [<a00000010000bb00>] ia64_native_leave_kernel+0x0/0x270
 [<a000000100888f10>] __xfrm_lookup+0x650/0x760
 [<a0000001007ec410>] ip_route_output_flow+0xf0/0x480
 [<a000000100846c30>] ip4_datagram_connect+0x330/0x5e0
 [<a00000010085f420>] inet_dgram_connect+0x140/0x180
 [<a0000001007854f0>] sys_connect+0xf0/0x1a0
 [<a00000010000b980>] ia64_ret_from_syscall+0x0/0x20
 [<a000000000010720>] __kernel_syscall_via_break+0x0/0x20

I tried the patch you just posted.  Compiling with it gave this warning:

net/xfrm/xfrm_policy.c: In function ‘__xfrm_lookup’:
net/xfrm/xfrm_policy.c:1735: warning: ‘num_xfrms’ may be used
uninitialized in this function

but the patched kernel booted ok.

-Tony
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