[Click] Repeatable way to kernel panic via Click?
Eddie Kohler
kohler at cs.ucla.edu
Mon Aug 27 10:55:03 EDT 2007
David,
Can you reproduce the problem with current CVS Click?
There is a possibility that one of the following patches, which are not in
1.5.0 (but is in the current CVS), fixed this problem.
2007-02-05 Monday 15:11 Eddie Kohler <kohler at cs.ucla.edu>
* elements/linuxmodule/: anydevice.cc (1.35), anydevice.hh (1.43),
fromdevice.cc (1.94), fromdevice.hh (1.45), fromhost.cc (1.55),
polldevice.cc (1.144), todevice.cc (1.151), todevice.hh (1.75),
tohost.cc (1.50), tulipstats.cc (1.24): add safer locking to
AnyDeviceMap manipulations: we need to lock on BOTH reading and
writing. Hope this causes no deadlocks. John Bicket reported a
problem that sent me on this trail in 6/2006
2007-02-03 Saturday 18:06 Eddie Kohler <kohler at cs.ucla.edu>
* linuxmodule/: clickfs.cc (1.53), config.cc (1.25): avoid "wrong
cpu" problems in click-install by not holding any spinlock_t
objects for long periods
Eddie
dmoore7 at nd.edu wrote:
> Did some testing with a second machine, same hardware as first. I'm getting
> crashes/panics in the same way. Both machines are recompiled vanilla kernels
> with preemption turned off. However on another machine (a mac-mini) the same
> click config loads without errors. I'm going to fiddle with them physically
> and see if I can get somewhere.
>
> If anyone cares, here is the dump left when click crashed. Every line was
> proceeded by the "Message from..." line, I took those out for readability. The
> config file in question is posted below.
> For a graphical view of what this config does, check out:
> cse.nd.edu/~dmoore7/myrouter.jpg
> ------------------------------------
> [root at firenze ~]# click-install ./Firenze-base.click
> Segmentation fault
> [root at firenze ~]#
> Message from syslogd at firenze at Thu Aug 23 16:49:31 2007 ...
> firenze kernel: Oops: 0002 [#1]
> firenze kernel: SMP
> firenze kernel: CPU: 0
> firenze kernel: EIP is at _ZN4Task17strong_rescheduleEv+0x12/0x1a0 [click]
> firenze kernel: eax: f543d8d4 ebx: 00000001 ecx: 00000000 edx: f78b3000
> firenze kernel: esi: f543d8d4 edi: f692e000 ebp: 00000000 esp: f692ecb8
> firenze kernel: ds: 007b es: 007b ss: 0068
> firenze kernel: Process click-install (pid: 3962, threadinfo=f692e000
> task=f78b3000)
> firenze kernel: Stack: <0>f8affbaa 00000001 f7015000 f692ecd4 f8b005c7 f692ecd4
> 00ffffff f57a55e0
> firenze kernel: 00000001 00000004 f7015000 f8c79ac8 f7015000 00000001
> c02e28f6 f7015000
> firenze kernel: 00000000 00001002 c028a6b9 f7015000 00001043 c028b916
> f692ed2c 00000001
> firenze kernel: Call Trace:
> firenze kernel: [<f8affbaa>]
> _ZN8ToDevice13change_deviceEP10net_device+0x2a/0x60 [click]
> firenze kernel: [<f8b005c7>] device_notifier_hook+0x77/0x90 [click]
> firenze kernel: [<c02e28f6>] notifier_call_chain+0x17/0x2e
> firenze kernel: [<c028a6b9>] dev_open+0x66/0x6d
> firenze kernel: [<c028b916>] dev_change_flags+0x48/0xed
> firenze kernel: [<c028c14b>] dev_ioctl+0x309/0x3e2
> firenze kernel: [<f8afc8a2>]
> _Z10dev_updownP10net_deviceiP12ErrorHandler+0x72/0x110 [click]
> firenze kernel: [<f8afc78c>]
> _ZN8FromHost20set_device_addressesEP12ErrorHandler+0xac/0x150 [click]
> firenze kernel: [<f8afca11>] _ZN8FromHost10initializeEP12ErrorHandler+0xd1/0xf0
> [click]
> firenze kernel: [<f8aaa5e6>] _Znaj+0x16/0x20 [click]
> firenze kernel: [<f8aca942>] _ZN6Router10initializeEP12ErrorHandler+0x682/0x780
> [click]
> firenze kernel: [<c013ec1d>] __alloc_pages+0x59/0x273
> firenze kernel: [<f8b20111>]
> _Z12write_configRK6StringP7ElementPvP12ErrorHandler+0x121/0x1e0 [clic k]
> firenze kernel: [<f8ac456f>]
> _ZNK7Handler10call_writeERK6StringP7ElementbP12ErrorHandler+0x13f/0x2 10
> [click]
> firenze kernel: [<c01533b2>] cache_grow+0x128/0x14a
> firenze kernel: [<f8b23789>] handler_flush+0x499/0x590 [click]
> firenze kernel: [<f8aaa5e6>] _Znaj+0x16/0x20 [click]
> firenze kernel: [<c0155720>] filp_close+0x31/0x52
> firenze kernel: [<c01031ab>] sysenter_past_esp+0x54/0x75
> firenze kernel: Code: ff eb d7 c7 04 24 b5 26 b3 f8 e8 0a f4 ff ff e9 60 ff ff
> ff 90 8d 74 26 00 57 bf 00 f0 ff ff 56 89 c6 53 83 ec 04 21 e7 8b 4e 1c <f0>
> ff 41 4c 8d 59 44 8b 47 10 ba 01 00 00 00 39 43 04 74 2a 8d
> --------------------------------
> //Routing Configuration for Host Firenze
> // Routing for Device eth2
> // All from's and to's this real device and its spoof children
> // Real Device Connection
> RealFromDevice_eth2 :: FromDevice(eth2);
> RealToDevice_eth2 :: Queue -> ToDevice(eth2);
> // Real Host Spoof
> RealFromHost_eth2 :: FromHost(fake_eth2, 192.168.10.6/24, ETHER
> 00:04:23:C3:6A:6A);
> RealToHost_eth2 :: ToHost(fake_eth2);
>
> // Spoof Host spoof_eth2_0
> FromHost(spoof_eth2_0, 192.168.10.11/24, ETHER 00:04:23:C3:6A:6A) -> Queue ->
> BandwidthRatedUnqueue(1000000 bps) -> Queue -> SpoofFromHost_spoof_eth2_0 ::
> DelayUnqueue(5 ms)
> SpoofToHost_spoof_eth2_0 :: Queue -> BandwidthRatedUnqueue(8000000 bps) -> Queue
> -> DelayUnqueue(5 ms) -> ToHost(spoof_eth2_0);
>
> // Spoof Host spoof_eth2_1
> FromHost(spoof_eth2_1, 192.168.10.12/24, ETHER 00:04:23:C3:6A:6A) -> Queue ->
> BandwidthRatedUnqueue(1000000 bps) -> Queue -> SpoofFromHost_spoof_eth2_1 ::
> DelayUnqueue(5 ms)
> SpoofToHost_spoof_eth2_1 :: Queue -> BandwidthRatedUnqueue(8000000 bps) -> Queue
> -> DelayUnqueue(5 ms) -> ToHost(spoof_eth2_1);
>
> // Spoof Host spoof_eth2_2
> FromHost(spoof_eth2_2, 192.168.10.13/24, ETHER 00:04:23:C3:6A:6A) -> Queue ->
> BandwidthRatedUnqueue(1000000 bps) -> Queue -> SpoofFromHost_spoof_eth2_2 ::
> DelayUnqueue(5 ms)
> SpoofToHost_spoof_eth2_2 :: Queue -> BandwidthRatedUnqueue(8000000 bps) -> Queue
> -> DelayUnqueue(5 ms) -> ToHost(spoof_eth2_2);
>
>
> // Now we define all globally used Pipe's and Switches
> // Entrance for all inc on real devices traffic, splits IP and 'others'
> YePipeInc_eth2 :: Classifier( 12/0800,// IP packets
> -); // Any others
>
> // Entrance for all inc on host traffic, splits IP and 'others'
> YePipeOut_eth2 :: Classifier( 12/0800,// IP packets
> -); // Any others
>
> UnknownOutTee_eth2 :: Tee; // For non-IP traffic to pass unhindered
> UnknownIncTee_eth2 :: Tee; // For non-IP traffic to pass unhindered
>
> PipeOutRealToDevice_eth2_0 :: Print(OutPipe) -> Strip(14) -> EtherEncap(0x0800,
> 00:04:23:C3:6A:6A, 00:04:23:C2:8C:1E) ->
> Queue -> BandwidthRatedUnqueue(1000000000 bps) -> Queue -> DelayUnqueue(50 ms)
> -> RealToDevice_eth2;
>
> //This Adds pipe IP and click_name to the routing table for external routes
>
> // Splitter to grab any packet destined for a local real or spoof device
> LocalDstSplitter_eth2 :: IPClassifier(dst 192.168.10.6, // dst for
> RealToHost_eth2
> dst 192.168.10.11, // dst for
> SpoofToHost_spoof_eth2_0
> dst 192.168.10.12, // dst for
> SpoofToHost_spoof_eth2_1
> dst 192.168.10.13, // dst for
> SpoofToHost_spoof_eth2_2
> -); // All other IP packets
> // Splitter to grab any packet destined for a connected real device
> RemoteDstSplitter_eth2 :: IPClassifier(dst 192.168.10.4, // dst for
> PipeOutRealToDevice_eth2_0
> dst 192.168.10.3, // dst for
> PipeOutRealToDevice_eth2_0
> -); // All other IP packets
>
> // Routing Setup
> // All packets coming in on Real Devices must be passed to YePipeInc
> // All packets going out on From all real and spoof interfaces must be passed to
> YePipeOut
> // Now you see why we call them Ye Pipes!
> RealFromDevice_eth2 -> Print(FromDevice) -> YePipeInc_eth2
> RealFromHost_eth2 -> Print(FromRealHost) -> YePipeOut_eth2
> SpoofFromHost_spoof_eth2_0 -> Print(FromSpoofHost) -> YePipeOut_eth2
> SpoofFromHost_spoof_eth2_1 -> Print(FromSpoofHost) -> YePipeOut_eth2
> SpoofFromHost_spoof_eth2_2 -> Print(FromSpoofHost) -> YePipeOut_eth2
>
> YePipeInc_eth2[1] -> UnknownIncTee_eth2; // Non-IP traffic heads off unhindered
> YePipeOut_eth2[1] -> UnknownOutTee_eth2; // Non-IP traffic heads off unhindered
>
> YePipeInc_eth2[0] -> Print(PipeIncToLclSplitter) -> LocalDstSplitter_eth2; //
> All IP traffic hits the first splitter
> YePipeOut_eth2[0] -> Print(PipeOutToLclSplitter) -> LocalDstSplitter_eth2; //
> All IP traffic hits the first splitter
>
> // Here all non-IP traffic is passed on: outgoing traffic on all outgoing
> devices,
> // and incoming traffic to all registered hosts.
> UnknownIncTee_eth2[0] -> RealToHost_eth2
> UnknownOutTee_eth2[0] -> RealToDevice_eth2
> UnknownIncTee_eth2[1] -> SpoofToHost_spoof_eth2_0
> UnknownIncTee_eth2[2] -> SpoofToHost_spoof_eth2_1
> UnknownIncTee_eth2[3] -> SpoofToHost_spoof_eth2_2
> UnknownOutTee_eth2[1] -> UnknownIncTee_eth2; // For the benefit of Spoof ARP's,
> we send non-IP stuff back around
>
> // Time to process the IP traffic: which was sent through the filter for local
> destinations
> LocalDstSplitter_eth2[0] -> Print(ToHost) -> RealToHost_eth2;
> LocalDstSplitter_eth2[1] -> Print(ToHost) -> SpoofToHost_spoof_eth2_0;
> LocalDstSplitter_eth2[2] -> Print(ToHost) -> SpoofToHost_spoof_eth2_1;
> LocalDstSplitter_eth2[3] -> Print(ToHost) -> SpoofToHost_spoof_eth2_2;
> // This final output is sent on to the remote splitter
> LocalDstSplitter_eth2[4] -> Print(ToRemoteSplitter) -> RemoteDstSplitter_eth2;
> // Not local destination, on to routing fun
>
> // Now we process all IP traffic that is NOT going to a local destination
> RemoteDstSplitter_eth2[0] -> PipeOutRealToDevice_eth2_0;
> RemoteDstSplitter_eth2[1] -> PipeOutRealToDevice_eth2_0;
> RemoteDstSplitter_eth2[2] -> Print(Discarded) -> Discard; // No idea who its
> going to, drop it
>
>
>
>
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