UDP LOR with the latest RELENG_7

Vlad GALU dudu at dudu.ro
Fri Oct 10 08:25:02 PDT 2008


On Fri, Oct 10, 2008 at 6:21 PM, Jeremy Chadwick <koitsu at freebsd.org> wrote:
> On Fri, Oct 10, 2008 at 06:11:25PM +0300, Vlad GALU wrote:
>> On Fri, Oct 10, 2008 at 5:57 PM, Mike Tancsa <mike at sentex.net> wrote:
>> > At 08:40 AM 10/10/2008, Vlad GALU wrote:
>> >>
>> >>   As my kernel had started to lock up periodically and I don't have
>> >> hands-on access to that machine, I enabled WITNESS.
>> >> So these started to pop up:
>> >
>> > Is this with a stock kernel and sysctl settings ?  Or do you have any custom
>> > kernel options ?
>>
>>    Jeremy pointed to a possible culprit - running csup again brought
>> uipc_usrreq.c to version 1.206.2.5. I'm rebuilding a new kernel with
>> this revision as I type and I'll see how it goes. I'm attaching the
>> sysctl.conf below just to be safe:
>
> I remember LORs pertaining to UDP being discussed recently.
>
> Possibly relevant threads:
>
> http://lists.freebsd.org/pipermail/freebsd-stable/2008-September/thread.html#45020
> http://lists.freebsd.org/pipermail/freebsd-stable/2008-September/thread.html#45109
> http://lists.freebsd.org/pipermail/freebsd-stable/2008-September/thread.html#45193
> http://lists.freebsd.org/pipermail/freebsd-stable/2008-September/thread.html#45231
>
> The last one is rwatson's fix, and confirmation from a couple people
> that it fixes their issues.

   I've rebuilt the kernel, the LORs are still there :(
-- cut here --
--- syscall (97, FreeBSD ELF64, socket), rip = 0x80070427c, rsp =
0x7fffffffe8c8, rbp = 0x5269c8 ---
uma_zalloc_arg: zone "16" with the following non-sleepable locks held:
exclusive rw udp r = 0 (0xffffffff8064c928) locked @
/usr/src/sys/netinet/udp_usrreq.c:1125
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2a
witness_warn() at witness_warn+0x241
uma_zalloc_arg() at uma_zalloc_arg+0x290
malloc() at malloc+0x5c
getenv() at getenv+0x93
getenv_quad() at getenv_quad+0x13
getenv_int() at getenv_int+0x15
udp_inpcb_init() at udp_inpcb_init+0x1f
slab_zalloc() at slab_zalloc+0x1ad
uma_zone_slab() at uma_zone_slab+0xb4
uma_zalloc_arg() at uma_zalloc_arg+0x31d
in_pcballoc() at in_pcballoc+0x38
udp_attach() at udp_attach+0x57
socreate() at socreate+0x14f
socket() at socket+0x8a
syscall() at syscall+0x1a9
Xfast_syscall() at Xfast_syscall+0xab
--- syscall (97, FreeBSD ELF64, socket), rip = 0x80070427c, rsp =
0x7fffffffe8c8, rbp = 0x5269c8 ---
-- and here --

  I'll see whether the system still locks up or not though..
>
>> -- cut here --
>> kern.ipc.maxsockets=32768
>> kern.ipc.nmbclusters=65536
>> kern.ipc.shmall=134217728
>> kern.ipc.shmmax=134217728
>> kern.logsigexit=0
>> kern.maxfiles=131072
>> kern.maxfilesperproc=32768
>> kern.randompid=100
>> kern.random.sys.harvest.swi=1
>> kern.securelevel=-1
>> net.bpf.bufsize=1048576
>> net.bpf.maxbufsize=1048576
>> net.inet.icmp.drop_redirect=1
>> net.inet.icmp.icmplim=20
>> net.inet.icmp.icmplim_output=0
>> net.inet.icmp.maskrepl=0
>> net.inet.icmp.reply_from_interface=1
>> net.inet.ip.check_interface=0
>> net.inet.ip.forwarding=1
>> net.inet.ip.fastforwarding=1
>> net.inet.ip.process_options=0
>> net.inet.ip.random_id=0 # scrubbing with pf
>> net.inet.ip.redirect=0
>> net.inet.ip.stealth=1
>> net.inet.tcp.always_keepalive=1
>> net.inet.tcp.blackhole=2
>> net.inet.tcp.delayed_ack=1
>> net.inet.tcp.drop_synfin=1
>> net.inet.tcp.log_in_vain=0
>> net.inet.tcp.recvspace=32768
>> net.inet.tcp.rfc1323=1
>> net.inet.tcp.rfc3042=1
>> net.inet.tcp.rfc3390=1
>> net.inet.tcp.sack.enable=1
>> net.inet.tcp.sendspace=32768
>> net.inet.tcp.syncookies=0
>> net.inet.udp.blackhole=1
>> net.inet.udp.log_in_vain=0
>> net.link.ether.inet.max_age=1200
>> security.bsd.conservative_signals=1
>> security.bsd.hardlink_check_gid=0
>> security.bsd.hardlink_check_uid=1
>> security.bsd.see_other_gids=0
>> security.bsd.see_other_uids=0
>> security.bsd.suser_enabled=1
>> security.bsd.unprivileged_get_quota=0
>> security.bsd.unprivileged_proc_debug=0
>> security.bsd.unprivileged_read_msgbuf=0
>> security.jail.allow_raw_sockets=0
>> security.jail.set_hostname_allowed=0
>> security.jail.socket_unixiproute_only=1
>> security.jail.sysvipc_allowed=0
>> security.mac.seeotheruids.enabled=1
>> security.mac.seeotheruids.specificgid_enabled=1
>> security.mac.seeotheruids.specificgid=0
>> vfs.hirunningspace=33554432
>> vfs.read_max=16
>> vfs.ufs.dirhash_maxmem=8388608
>> -- and here --
>
> Good grief, we could spend 2 years debugging just the sysctl.conf
> pieces...  :-)
>
> --
> | Jeremy Chadwick                                jdc at parodius.com |
> | Parodius Networking                       http://www.parodius.com/ |
> | UNIX Systems Administrator                  Mountain View, CA, USA |
> | Making life hard for others since 1977.              PGP: 4BD6C0CB |
>
>



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