[Bug 1584431] Re: mongosniff crashes on start

[Robie Basak]

I've just got round to this again - sorry for the delay.

AFAICT, the quilt patch doesn't apply cleanly neither in Xenial nor in
Yakkety. I don't know if I have a tooling problem here though. I don't
remember if I verified this when I reviewed. Please could you take a
look?

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Title:
  mongosniff crashes on start

Status in mongodb package in Ubuntu:
  Fix Released
Status in mongodb source package in Xenial:
  In Progress
Status in mongodb source package in Yakkety:
  In Progress

Bug description:
  == Begin SRU Template ==
  [Impact]

   * mongosniff crashes when it receives messages with no namespace. The result is that a user cannot even press only the enter key without the mongosniff application crashing.
  * mongosniff in Xenial and Yakkety is essentially broken currently because of a check in the code that gets the message namespace, but if there is no namespace it crashes.

  [Test Case]

   * lxc launch ubuntu-daily:xenial xenial
   * lxc exec xenial bash
   * apt install mongodb
   * mongosniff --source NET lo
   * # Open a 2nd terminal and run the following
   * lxc exec xenial bash
   * mongo
   * # press enter a few times or type 'help'
   * # Observe mongosniff abort, with a core dump, in the first window

  [Regression Potential]

  * Users currently experiencing this issue would be expecting a SRU fix to come from us as the application is broken in a major way.
  * The only work around it would would require rebuilding mongodb from source with the fix to resolve the issue.
  * The change was limited to the mongosniff source code only.

  [Other Info]

  Ubuntu:
  * Xenial x64

  Packages:
  #user at localhost:~$ for i in `dpkg --get-selections|grep -v deinstall|grep mongo|cut -f1`; do echo $i `sudo apt-cache show $i|sed -n -e 's/^.*Version: 1://p'`; done
  * mongodb 2.6.10-0ubuntu1
  * mongodb-clients 2.6.10-0ubuntu1
  * mongodb-server 2.6.10-0ubuntu1

  ----
  Steps to reproduce:

  1. start service
  2. start sniffer
  3. start shell
  4. crash sniffer
  ---

  user at localhost:~$ sudo service mongodb start

  user at localhost:~$ mongo
  MongoDB shell version: 2.6.10
  connecting to: test

  (...)

  user at localhost:~$ sudo mongosniff --source NET lo
  sniffing... 27017
  127.0.0.1:37522  -->> 127.0.0.1:27017 admin.$cmd  60 bytes  id:0	0
   query: { whatsmyuri: 1 }  ntoreturn: 1 ntoskip: 0
  2016-05-22T01:26:35.545-0400 Assertion failure messageShouldHaveNs() src/mongo/db/dbmessage.cpp 82
  2016-05-22T01:26:35.553-0400 0xea35a9 0xe397cf 0xe14772 0x86aca8 0x615c13 0x7f614d369ef6 0x7f614d36e9d1 0x7f614d3731fd 0x616a5a 0x5e57a9 0x7f614c71a830 0x614389
   mongosniff(_ZN5mongo15printStackTraceERSo+0x39) [0xea35a9]
   mongosniff(_ZN5mongo10logContextEPKc+0x21f) [0xe397cf]
   mongosniff(_ZN5mongo12verifyFailedEPKcS1_j+0x142) [0xe14772]
   mongosniff() [0x86aca8]
   mongosniff(_Z10got_packetPhPK11pcap_pkthdrPKh+0x573) [0x615c13]
   /usr/lib/x86_64-linux-gnu/libpcap.so.0.8(+0x5ef6) [0x7f614d369ef6]
   /usr/lib/x86_64-linux-gnu/libpcap.so.0.8(+0xa9d1) [0x7f614d36e9d1]
   /usr/lib/x86_64-linux-gnu/libpcap.so.0.8(pcap_loop+0x5d) [0x7f614d3731fd]
   mongosniff(_Z8toolMainiPPcS0_+0x69a) [0x616a5a]
   mongosniff(main+0x9) [0x5e57a9]
   /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0) [0x7f614c71a830]
   mongosniff(_start+0x29) [0x614389]
  terminate called after throwing an instance of 'mongo::AssertionException'
    what():  assertion src/mongo/db/dbmessage.cpp:82
  Aborted (core dumped)
  user at localhost:~$

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