* Re: (solved?) Bridge code Oops with 2.6.14.2 (was: Re: [uml-devel] RE: [uml-user] guest soft lockup after mounting root fs in skasmode)
[not found] <7B4268E5ACB878429B58D4BE5B780E83506E53@NWS-EXCH2.nws.oregonstate.edu>
@ 2006-02-10 17:12 ` Blaisorblade
0 siblings, 0 replies; only message in thread
From: Blaisorblade @ 2006-02-10 17:12 UTC (permalink / raw)
To: Brock, Anthony - NET, user-mode-linux-devel
On Thursday 29 December 2005 21:57, Brock, Anthony - NET wrote:
> Blaisorblade,
>
> Thanks! This clears up the source of the issue. Unfortunately, I'm now a
> little baffled by why a newer guest kernel would change behavior. In any
> case, we now need to decide if a bug-report is worth the effort. *sigh*
I was looking at newly released 2.6.15.4, and found this in the log:
commit a426fa9147f034d5355875ffcb91f0a61e5b393a
tree 9ae78d4cf9ae05fc71183e1b3a23244dc2cd3bc2
parent ec81e3178071f3747bd1522c959972105584514b
author Stephen Hemminger <shemminger@osdl.org> lun, 06 feb 2006 15:42:45 -0800
committer Chris Wright <chrisw@sous-sol.org> gio, 09 feb 2006 23:20:15 -0800
[PATCH] bridge: fix RCU race on device removal
Patch to 2.6.15 stable kernel to fix race conditions on device
removal. These are reproducible by doing delif while packets are
in flight.
Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
commit ec81e3178071f3747bd1522c959972105584514b
tree 7af2fd04c854e0c3c2e4637d3b404499e360a28d
parent 09a17332563531806883b67bf8a9fe0ef0200262
author Stephen Hemminger <shemminger@osdl.org> lun, 06 feb 2006 15:41:15 -0800
committer Chris Wright <chrisw@sous-sol.org> gio, 09 feb 2006 23:20:15 -0800
[PATCH] bridge: netfilter races on device removal
Fix bridge netfilter to handle case where interface is deleted
from bridge while packet is being processed (on other CPU).
Fixes: http://bugzilla.kernel.org/show_bug.cgi?id=5803
Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Indeed, since you are shutting down a guest instance when getting the crash,
it is _possible_ that an interface is brought down on the host (even if with
bridging it's strange this happens), so these bugs *may* be fixed by those
patches.
Hope it helps!
> > > Unable to handle kernel NULL pointer dereference at virtual address
> > > 00000000
> > > printing eip:
> > > f8be14f4
> > > *pde = 00000000
> > > Oops: 0000 [#1]
> > > SMP
> > > Modules linked in: autofs4 tun ipv6 bridge floppy pcspkr hw_random
> > > i2c_amd8111 generic amd74xx shpchp pci_hotplug ohci_hcd
> >
> > usbcore raid1
> >
> > > md_mod dm_mod rtc w83627hf eeprom lm85 hwmon_vid i2c_isa i2c_amd756
> > > i2c_core tg3 e100 mii psmouse ide_generic ide_disk ide_cd
> >
> > cdrom ide_core
> >
> > > unix
> > > CPU: 1
> > > EIP: 0060:[<f8be14f4>] Not tainted VLI
> > > EFLAGS: 00010287 (2.6.14.2-skas3-v8.2)
> > > EIP is at br_nf_forward_ip+0xa2/0x16a [bridge]
> > > eax: 00000000 ebx: d7b59dc0 ecx: ea4a5380 edx: 00000080
> > > esi: 00000002 edi: 00000002 ebp: f8bdbdb7 esp: e172bcc8
> > > ds: 007b es: 007b ss: 0068
> > > Process linux-2.6.7-02- (pid: 4049, threadinfo=e172a000
> >
> > task=e99ed550)
> >
> > > Stack: 80000000 c03e7350 c02d44e7 00000002 e172bd58
> >
> > f8be1334 80000000
> >
> > > ea4a5380
> > > e172bd40 80000000 c03e7350 c02d44e7 00000002
> >
> > e172bd7c f2641000
> >
> > > efd7e800
> > > f8bdbdb7 00000002 e172bd7c c03e7350 f8bdbdb7
> >
> > c02d4564 c03e7350
> >
> > > e172bd7c
> > > Call Trace:
> > > [<c02d44e7>] nf_iterate+0x66/0x8a
> > > [<f8be1334>] br_nf_forward_finish+0x0/0x11e [bridge]
> > > [<c02d44e7>] nf_iterate+0x66/0x8a
> > > [<f8bdbdb7>] br_forward_finish+0x0/0x6b [bridge]
> > > [<f8bdbdb7>] br_forward_finish+0x0/0x6b [bridge]
> > > [<c02d4564>] nf_hook_slow+0x59/0x10e
> > > [<f8bdbdb7>] br_forward_finish+0x0/0x6b [bridge]
> > > [<f8bdbefa>] __br_forward+0x63/0x7c [bridge]
> > > [<f8bdbdb7>] br_forward_finish+0x0/0x6b [bridge]
> > > [<f8bdc11b>] br_flood_forward+0x27/0x2c [bridge]
> > > [<f8bdbe97>] __br_forward+0x0/0x7c [bridge]
> > > [<f8bdcb1b>] br_handle_frame_finish+0x11b/0x137 [bridge]
> > > [<f8be094c>] br_nf_pre_routing_finish+0x1a6/0x36b [bridge]
> > > [<f8bdca00>] br_handle_frame_finish+0x0/0x137 [bridge]
> > > [<f8be07a6>] br_nf_pre_routing_finish+0x0/0x36b [bridge]
> > > [<f8be07a6>] br_nf_pre_routing_finish+0x0/0x36b [bridge]
> > > [<c02d4564>] nf_hook_slow+0x59/0x10e
> > > [<f8be07a6>] br_nf_pre_routing_finish+0x0/0x36b [bridge]
> > > [<f8bdca00>] br_handle_frame_finish+0x0/0x137 [bridge]
> > > [<f8be11a6>] br_nf_pre_routing+0x332/0x457 [bridge]
> > > [<f8be07a6>] br_nf_pre_routing_finish+0x0/0x36b [bridge]
> > > [<c02d44e7>] nf_iterate+0x66/0x8a
> > > [<f8bdca00>] br_handle_frame_finish+0x0/0x137 [bridge]
> > > [<f8bdca00>] br_handle_frame_finish+0x0/0x137 [bridge]
> > > [<c02d4564>] nf_hook_slow+0x59/0x10e
> > > [<f8bdca00>] br_handle_frame_finish+0x0/0x137 [bridge]
> > > [<f8bdccec>] br_handle_frame+0x1b5/0x229 [bridge]
> > > [<f8bdca00>] br_handle_frame_finish+0x0/0x137 [bridge]
> > > [<c027e6e9>] netif_receive_skb+0x1af/0x334
> > > [<f8a74bf5>] e100_poll+0x1cf/0x70c [e100]
> > > [<c027ea36>] net_rx_action+0xc1/0x197
> > > [<c01206a2>] __do_softirq+0x72/0xdd
> > > [<c0120740>] do_softirq+0x33/0x35
> > > [<c0104e7e>] do_IRQ+0x1e/0x24
> > > [<c0103772>] common_interrupt+0x1a/0x20
> > > Code: c1 e2 06 8d 82 90 71 3e c0 3b 82 90 71 3e c0 74 58 c7
> >
> > 44 24 18 00
> >
> > > 00 00 80 c7 44 24 14 34 13 be f8 8b 44 24 3c 8b 80 ec 02 00
> >
> > 00 <8b> 00
> >
> > > 8b 40 0c 89 44 24 10 8b 44 24 38 8b 80 ec 02 00 00 8b 00
--
Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!".
Paolo Giarrusso, aka Blaisorblade (Skype ID "PaoloGiarrusso", ICQ 215621894)
http://www.user-mode-linux.org/~blaisorblade
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