[ltt-dev] net extended trace openin error with LTTV (without attachment)
Benjamin Poirier
benjamin.poirier at polymtl.ca
Mon Feb 8 15:07:08 EST 2010
paljak at mit.bme.hu wrote:
>
> -----Mathieu Desnoyers <compudj at krystal.dyndns.org> wrote: -----
>
> To: paljak at mit.bme.hu
> From: Mathieu Desnoyers <compudj at krystal.dyndns.org>
> Date: 2010/02/08 16:36
> cc: benjamin.poirier at polymtl.ca, ltt-dev at lists.casi.polymtl.ca
> Subject: Re: [ltt-dev] net extended trace openin error with LTTV
> (without attachment)
>
> * paljak at mit.bme.hu (paljak at mit.bme.hu) wrote:
> > Hi Ben,
> >
> > I have been working with LTTng lately and the more I know it, the
> more I
> > like it!
> >
> > I've also been able to open and examine traces, and it looks very
> > interesting.
> >
> > I've also tried to create my own, but I've ran into an error,
> could you
> > take a look?
> >
> > Basically, I receive an error
> > (ERROR:tracefile.c:1582:ltt_update_event_size: assertion failed:
> (info !=
> > NULL)) every time i try to open a net_extended trace with LTTV.
> >
> > Here's what i've done:
> >
> > 1. Downloaded the patched kernel: git clone
> >
> git://git.kernel.org/pub/scm/linux/kernel/git/compudj/linux-2.6-lttng.git
> > 2. Compiled the kernel with these options (.config):
> > #
> > # GCOV-based kernel profiling
> > #
> > # CONFIG_GCOV_KERNEL is not set
> > CONFIG_SLOW_WORK=y
> > # CONFIG_SLOW_WORK_DEBUG is not set
> > CONFIG_LTT=y
> > CONFIG_LTT_FILTER=m
> > CONFIG_HAVE_LTT_DUMP_TABLES=y
> > CONFIG_LTT_RELAY=y
> > CONFIG_LTT_RELAY_LOCKLESS=y
> > # CONFIG_LTT_RELAY_IRQOFF is not set
> > # CONFIG_LTT_RELAY_LOCKED is not set
> > CONFIG_LTT_SERIALIZE=y
> > CONFIG_LTT_FAST_SERIALIZE=y
> > CONFIG_LTT_TRACEPROBES=m
> > CONFIG_LTT_TRACE_CONTROL=y
> > CONFIG_LTT_TRACER=y
> > CONFIG_LTT_ALIGNMENT=y
> > CONFIG_LTT_CHECK_ARCH_EFFICIENT_UNALIGNED_ACCESS=y
> > # CONFIG_LTT_DEBUG_EVENT_SIZE is not set
> > CONFIG_LTT_USERSPACE_EVENT=m
> > CONFIG_LTT_VMCORE=y
> > CONFIG_LTT_STATEDUMP=m
> > CONFIG_LTT_KPROBES=m
> > # CONFIG_LTT_ASCII is not set
> > 3. Install the kernel and boot it up
> > 4. Load all the modules
> > modprobe -v ltt-trace-control
> > modprobe -v ltt-marker-control
> > modprobe -v ltt-tracer
> > modprobe -v ltt-serialize
> > modprobe -v ltt-relay
> > modprobe -v ipc-trace
> > modprobe -v kernel-trace
> > modprobe -v mm-trace
> > modprobe -v net-trace
> > modprobe -v fs-trace
> > modprobe -v jbd2-trace
> > modprobe -v ext4-trace
> > modprobe -v syscall-trace
> > modprobe -v trap-trace
> > modprobe -v ltt-statedump
> > #extended trace
> > modprobe -v net-extended-trace
> > 5. ltt-armall -n
> > 6. lttctl -C -w /tmp/tr1 tr1
> > 7. wget http://google.com
> > 8. lttctl -D tr1
> > 9. lttv -m textDump -t tr1
> > **
> > ERROR:tracefile.c:1582:ltt_update_event_size: assertion failed:
> (info !=
> > NULL)
> > /usr/local/bin/lttv: line 15: 2083 Aborted $0.real $*
> > 10. lttv -m textDump -t tr1 --verbose --debug --edebug
> > net.udpv4_rcv_extended: 1003.743082325 (/tmp/tr1/net_0), 1878, 1878,
> > gnome-terminal, , 1, 0x0, SOFTIRQ { skb = 0xC4BBC240, saddr =
> 3576624693,
> > daddr = 3232235780, unicast = 1, ulen = 110, source = 53, dest =
> 39087,
> > data_start = a299884901000100 }
> > Event header (tracefile /tmp/tr1/net_0 offset bb8):
> > bb8 40 C2 BB C4
> > **
> > ERROR:tracefile.c:1582:ltt_update_event_size: assertion failed:
> (info !=
> > NULL)
> > /usr/local/bin/lttv: line 15: 2104 Aborted $0.real $*
> >
> > The installed versions are:
> > Linux Trace Toolkit Visualizer 0.12.29-02022010
> > Linux Trace Toolkit Trace Control 0.79-01022010
> >
> > Here's the created trace for reference:
> > http://www.mit.bme.hu/~paljak/trace.tgz
> <http://www.mit.bme.hu/%7Epaljak/trace.tgz>
> >
> > If I don't use net extended, than it works just fine. And I've
> also had
> > success open your example trace.
> >
> > Do you have any idea why do I get this error and how could I
> correct it?
>
> That looks like a field type error in the net extended event. Can you
> tell us what LTTng version you use ? (git branch should tell you)
>
> Is your traced machine 32 or 64 bits ? And what about the machine
> running lttv ?
>
> Reviewing ltt/probes/net-extended-trace.c might help.
>
> Thanks,
>
> Mathieu
>
> I use lttng-0.188. And I run lttng and lttv on the same, 32 bit machine.
>
> I'm checking net-extended-trace.c but reason I could think of to cause
> this error...
>
I can't reproduce the problem, but looking at the traces, I notice the alignment is different:
your trace:
metadata.core_marker_id: 994.751622140 (/tmp/trace/tr1/metadata_0), 0, 0, , , 0, 0x0, MODE_UNKNOWN { channel = "net", name = "udpv4_rcv_extended", event_id = 2, int = 4, long = 4, pointer = 4, size_t = 4, alignment = 4 }
my trace:
metadata.core_marker_id: 193.282545152 (/tmp/tr1/metadata_0), 0, 0, , , 0, 0x0, MODE_UNKNOWN { channel = "net", name = "udpv4_rcv_extended", event_id = 2, int = 4, long = 4, pointer = 4, size_t = 4, alignment = 0 }
Could you apply the following patch over the git kernel, build and test? Thanks.
diff --git a/ltt/probes/net-extended-trace.c b/ltt/probes/net-extended-trace.c
index 074bfec..88410f8 100644
--- a/ltt/probes/net-extended-trace.c
+++ b/ltt/probes/net-extended-trace.c
@@ -130,14 +130,14 @@ notrace void probe_udpv4_rcv_extended(struct sk_buff *skb)
* bytes of UDP data if they are not in a fragment*/
data.f8 = 0;
if (skb_headlen(skb) >= sizeof(struct udphdr) + 8)
- data.f8 = *(unsigned long long *)(skb->data + sizeof(*uh));
+ data.f8 = *(uint64_t *)(skb->data + sizeof(*uh));
else if (skb_headlen(skb) >= sizeof(struct udphdr))
memcpy(&data.f8, skb->data + sizeof(struct udphdr),
skb_headlen(skb) - sizeof(struct udphdr));
marker = &GET_MARKER(net, udpv4_rcv_extended);
ltt_specialized_trace(marker, marker->single.probe_private,
- &data, serialize_sizeof(data), sizeof(unsigned long long));
+ &data, serialize_sizeof(data), sizeof(uint64_t));
}
MODULE_LICENSE("GPL and additional rights");
> Thanks,
> Gergely
>
>
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>
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