netdev - Re: [PATCH 3/3] tun: Limit amount of queued packets per device

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Message-ID: <20090212111313.GD13859@gondor.apana.org.au>
Date:	Thu, 12 Feb 2009 19:13:13 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Alex Williamson <alex.williamson@...com>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH 3/3] tun: Limit amount of queued packets per device

On Tue, Feb 10, 2009 at 11:33:45AM -0700, Alex Williamson wrote:
> 
> I'm getting a variety of Oopses, null pointer derefs, etc... from this
> patch when trying to run a qemu guest on net-next-2.6 using a standard
> tap/bridge config.  I've included a sample below.  Thanks,

Are you using the current net-next-2.6 (which already has the
patch) or an older net-next-2.6 with the patch added by hand?

> [  173.231609] BUG: unable to handle kernel paging request at ffffffffffff8871
> [  173.233252] IP: [<ffffffff8044875e>] skb_copy_datagram_from_iovec+0x1e/0x260
> [  173.233252] PGD 203067 PUD 204067 PMD 0 
> [  173.233252] Oops: 0000 [#1] SMP 
> [  173.233252] last sysfs file: /sys/kernel/uevent_seqnum
> [  173.233252] CPU 5 
> [  173.233252] Modules linked in: tun nfs lockd nfs_acl auth_rpcgss sunrpc iptable_filter ip_tables ebtable_broute bridge stp ebtable_nat ebtable_filter ebtables x_tables ib_iser rdma_cm ib_cm iw_cm ib_sa ib_mad ib_core ib_addr ipv6 iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi parport_pc lp parport loop af_packet ipmi_devintf hpilo ipmi_si ipmi_msghandler iTCO_wdt iTCO_vendor_support hpwdt i5000_edac serio_raw edac_core psmouse pcspkr shpchp button container i5k_amb pci_hotplug joydev evdev ext3 jbd mbcache usbhid hid sg sd_mod ehci_hcd uhci_hcd lpfc scsi_transport_fc usbcore cciss scsi_tgt scsi_mod bnx2 dm_mirror dm_region_hash dm_log dm_snapshot dm_mod thermal processor fan thermal_sys fuse
> [  173.233252] Pid: 6770, comm: qemu-system-x86 Not tainted 2.6.29-rc3 #4
> [  173.233252] RIP: 0010:[<ffffffff8044875e>]  [<ffffffff8044875e>] skb_copy_datagram_from_iovec+0x1e/0x260
> [  173.233252] RSP: 0018:ffff880827cbfc68  EFLAGS: 00010292
> [  173.233252] RAX: 0000000000000000 RBX: ffffffffffff8809 RCX: 0000000000000148
> [  173.233252] RDX: ffff880827cbfe78 RSI: 0000000000000000 RDI: ffffffffffff8809

This means that the skb argument (RDI) is bogus.  However, I can't
see how that can happen unless some other corruption happened
earlier.

Does this occur on the first packet written?

Thanks,
-- 
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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