Hi,
I appreciate you help.
On 2015-04-08 00:43, Robert Edmonds wrote:
Hi, Rogerio:
Thanks for these details, I can easily spin up a dual core amd64 VM
running Debian jessie soon and try to replicate the problem.
Do you get a segfault immediately, or does it only occur after running
for some time under load?
segfault occur after some time.
Can you try testing with "num-threads: 1"? (This will still result in
multiple threads running in the Unbound process, but the dnstap I/O
thread will only be consuming data from a single worker thread.)
I get the same error with "num-threads: 1".
Also, can you compile your unbound package with debugging symbols and
obtain a backtrace from a crash? You should be able to build a
debugging enabled package with:
DEB_BUILD_OPTIONS='nostrip debug' dpkg-buildpackage -b -uc -us
Then, run "gdb --args unbound -d" until it crashes, and at the gdb
prompt run:
thread apply all bt full
The output is attached.
Thanks!
Rogerio Bastos wrote:
On 2015-04-06 22:44, Robert Edmonds wrote:
>Rogerio Bastos wrote:
>>I'm trying to test unbound witk dnstap. It works fine with low load, but
>>exists with segfault at high load. The segfault only happens when dnstap
>>is
>>enabled in configuration.
>>
>>I am using the debian package (version 1.5.3) avaible in [1] and
>>recompiled
>>with dnstap enabled.
>>I'm following instruction descripted in [2] and using fstrm version
>>0.2.0.
>>
>>To test the server, I'm using dnsblast [3] with the follow command:
>>
>>./dnsblast <server address> 50000 500
>
>Hi, Rogerio:
>
>Sorry to hear that. I would be happy to help debug dnstap (I wrote the
>dnstap patchset for Unbound). Can I get some information about your
>environment?
>
>Can you show the "dnstap:" block of settings from your config, and the
>"num-threads" server setting?
I'm using optimisation settings based on [1] (the Debian version is
compiled
with libevent):
server:
num-threads: 2
msg-cache-slabs: 2
rrset-cache-slabs: 2
infra-cache-slabs: 2
key-cache-slabs: 2
rrset-cache-size: 100m
msg-cache-size: 50m
outgoing-range: 8192
num-queries-per-thread: 4096
so-rcvbuf: 4m
so-sndbuf: 4m
I'm using the example from dnstap's site [2]:
dnstap:
dnstap-enable: yes
dnstap-socket-path: "/var/run/unbound/dnstap.sock"
dnstap-send-identity: yes
dnstap-send-version: yes
dnstap-log-resolver-response-messages: yes
dnstap-log-client-query-messages: yes
>Does fstrm's "make check" test suite succeed?
Yes, all tests is ok.
>What version of protobuf-c are you using? (Did you compile from source,
>or did you use a packaged version?)
The packaged version from Debian Jessie (version 1.0.2).
>What OS version are you using? (Based on your mention of the Debian
>package from experimental, I would guess Debian or Ubuntu.)
Debian Jessie, the next-stable version.
>Are you using a uniprocessor or SMP machine? Also, since there are some
>architecture-specific parts in fstrm, what architecture are you using?
I'm using a amd64 virtual machine with a two core CPU.
[1] https://www.unbound.net/documentation/howto_optimise.html
[2] http://dnstap.info/Examples/
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Thread 2 (Thread 0x7ffff5269700 (LWP 2598)):
#0 pthread_cond_timedwait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238
No locals.
#1 0x00007ffff776e638 in ?? () from /usr/lib/x86_64-linux-gnu/libfstrm.so.0
No symbol table info available.
#2 0x00007ffff776cbbd in ?? () from /usr/lib/x86_64-linux-gnu/libfstrm.so.0
No symbol table info available.
#3 0x00007ffff67880a4 in start_thread (arg=0x7ffff5269700) at
pthread_create.c:309
__res = <optimized out>
pd = 0x7ffff5269700
now = <optimized out>
unwind_buf = {cancel_jmp_buf = {{jmp_buf = {140737306334976,
-4520694634765884115, 1, 140737354125408,
93824996366800, 140737306334976, 4520679868110988589,
4520673803517945133}, mask_was_saved = 0}}, priv = {
pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0,
canceltype = 0}}}
not_first_call = <optimized out>
pagesize_m1 = <optimized out>
sp = <optimized out>
freesize = <optimized out>
__PRETTY_FUNCTION__ = "start_thread"
#4 0x00007ffff64bd04d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:111
No locals.
Thread 1 (Thread 0x7ffff7fe9700 (LWP 2594)):
---Type <return> to continue, or q <return> to quit---
#0 serviced_tcp_callback (c=0x0, arg=0x555556b853b0, error=-2, rep=0x0) at
services/outside_network.c:1596
r2 = {c = 0x3000000010, addr = {ss_family = 59744, __ss_align =
140737488349344,
__ss_padding =
"\000T\217\\\337`*\333\004\000\000\000}\000\000\000\000\000\000\000\377\177\000\000}",
'\000' <repeats 15 times>,
"\270\333vVUU\000\000\200pv\367\377\177\000\000\240\333vVUU", '\000' <repeats
14 times>,
"\001\000\000\000\252\\T\367\377\177\000\000\000\000\000\000\004\000\000\002\000T\217\\\337`*\333\000\000\000\000\001\000\000"},
addrlen = 4149479993, srctype = 32767, pktinfo = {v6info = {ipi6_addr
= {__in6_u = {
__u6_addr8 =
"\000\000\000\000\000\000\000\000\060\300]VUU\000", __u6_addr16 = {0, 0, 0, 0,
49200, 22109,
21845, 0}, __u6_addr32 = {0, 0, 1448984624, 21845}}},
ipi6_ifindex = 1432264672}, v4info = {
ipi_ifindex = 0, ipi_spec_dst = {s_addr = 0}, ipi_addr = {s_addr
= 1448984624}}}}
#1 0x00005555555e815a in outnet_tcptimer (arg=0x5555566d9630) at
services/outside_network.c:1120
w = 0x5555566d9630
outnet = 0x555555aa20e0
cb = 0x5555555e9fe0 <serviced_tcp_callback>
cb_arg = 0x555556b853b0
__func__ = "outnet_tcptimer"
#2 0x00007ffff75313dc in event_base_loop () from
/usr/lib/x86_64-linux-gnu/libevent-2.0.so.5
No symbol table info available.
#3 0x000055555558e61c in comm_base_dispatch (b=<optimized out>) at
util/netevent.c:305
retval = <optimized out>
#4 0x00005555555c80eb in worker_work (worker=<optimized out>) at
daemon/worker.c:1285
No locals.
#5 daemon_fork (daemon=0x55555583d010) at daemon/daemon.c:566
No locals.
#6 0x00005555555741a8 in run_daemon (debug_mode=<optimized out>,
cmdline_verbose=<optimized out>, cfgfile=<optimized out>)
---Type <return> to continue, or q <return> to quit---
at daemon/unbound.c:671
No locals.
#7 main (argc=1434701840, argv=0x55555585fb10) at daemon/unbound.c:766
c = 1437212896
winopt = 0x6c <error: Cannot access memory at address 0x6c>
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