Re: [dpdk-dev] Panic in rte MEMPOOL__mempool_check_cookies()

[Bruce Richardson <bruce.richardson@intel.com>]

On Wed, Nov 12, 2014 at 09:50:50PM -0500, Kamraan Nasim wrote:
> Hi Bruce,
> 
> The issue seems to be triggered by a combination of using the
> CONFIG_RTE_LIBRTE_MEMPOOL_DEBUG  option and contention in the mempool(small
> mempool size).
> 
> I disabled that and the header panics went away.
> 
> Thank you for your help!

No problem, though it does mean that we have a bug in the mempool debug functions
that will have to be investigated and fixed in the future. :-(

> 
> --Kam
> 
> On Fri, Nov 7, 2014 at 4:48 AM, Bruce Richardson <bruce.richardson@intel.com
> > wrote:
> 
> > On Thu, Nov 06, 2014 at 04:28:18PM -0500, Kamraan Nasim wrote:
> > > Greetings,
> > >
> > > I have been hitting this issue fairly consistently for the ixgbe driver
> > >
> > > MEMPOOL: obj=0x7ffeed1f5d00, mempool=0x7ffeecb69bc0,
> > cookie=badbadbadadd2e55
> > > PANIC in __mempool_check_cookies():
> > > MEMPOOL: bad header cookie (get)
> > >
> > > It seems to be a corruption in the mempool bound to my ixgbe port. What I
> > > have observed is that this ONLY happens if I initialize dpdk(i.e. start
> > > dpdk application) AFTER traffic is already flowing in through the port.
> > If
> > > I initialize dpdk and bind BEFORE I start traffic then things seem to
> > work
> > > fine.
> > >
> > > Any clues on why this might be happening?
> > >
> > > A bit stumped, so would really appreciate all the help I can get on this
> > > one.
> > >
> >
> > Hi.
> > Can you confirm if your application works ok with the mempool debug options
> > disabled? The mempool debug options are not often used because they slow
> > things
> > down so it's possible the bug could be in the cookie checking itself.
> >
> > /Bruce
> >
> > > Thanks,
> > > Kam
> > >
> > >
> > > (bt for your reference)
> > >
> > > #2  0x0000000000408cc6 in __rte_panic (funcname=0x571100
> > > "__mempool_check_cookies", format=
> > >     0x568fb0 "MEMPOOL: bad header cookie (get)\n%.0s")
> > >     at
> > >
> > /b/knasim/bandwagon/sbn/src/share/dpdk/lib/librte_eal/linuxapp/eal/eal_debug.c:83
> > > #3  0x00000000004af027 in __mempool_check_cookies (rxq=<value optimized
> > > out>)
> > >     at
> > >
> > /b/knasim/bandwagon/sbn/src/share/dpdk/x86_64-native-linuxapp-gcc/include/rte_mempool.h:357
> > > #4  rte_mempool_get_bulk (rxq=<value optimized out>)
> > >     at
> > >
> > /b/knasim/bandwagon/sbn/src/share/dpdk/x86_64-native-linuxapp-gcc/include/rte_mempool.h:1094
> > > #5  ixgbe_rx_alloc_bufs (rxq=<value optimized out>)
> > >     at
> > >
> > /b/knasim/bandwagon/sbn/src/share/dpdk/lib/librte_pmd_ixgbe/ixgbe_rxtx.c:997
> > > #6  0x00000000004afce9 in rx_recv_pkts (rx_queue=0x7ffeec8edbc0,
> > > rx_pkts=0x900410,
> > >     nb_pkts=<value optimized out>)
> > >     at
> > >
> > /b/knasim/bandwagon/sbn/src/share/dpdk/lib/librte_pmd_ixgbe/ixgbe_rxtx.c:1074
> > > #7  ixgbe_recv_pkts_bulk_alloc (rx_queue=0x7ffeec8edbc0,
> > rx_pkts=0x900410,
> > > nb_pkts=<value optimized out>)
> > >     at
> > >
> > /b/knasim/bandwagon/sbn/src/share/dpdk/lib/librte_pmd_ixgbe/ixgbe_rxtx.c:1124
> > > #8  0x0000000000520d36 in rte_eth_rx_burst (lp=0x900340, n_workers=14,
> > > bsz_rd=<value optimized out>, bsz_wr=
> > >     144, pos_lb=0 '\000') at /usr/lib/dpdk/include/rte_ethdev.h:2368
> >