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Hi Priyanka,

Are you using an old kernel ('uname -r' please)? I've seen issues with 
unlink_anon_vmas in Fedora, so this is rather interesting.

In regards to the 2nd kernel panic, it indicates that it's due to 
iptables and get_counters.

It's possibly related to this:

https://bugzilla.redhat.com/show_bug.cgi?id=1089569

Might be worth trying what was mentioned in the 5th comment.

Regards,
Matt.

On 2/06/2015 15:14, Priyanka wrote:
> Hi,
>
> I have an Openstack Juno setup with one controller node and 3 compute
> nodes. I installed it using packstack on centOS 7. One of the compute
> node crashed twice. First crash was two days back and second one today.
> It automatically restarts after the crash. The crash log in /var/crash
> were different in both the instances.
>
> Crash 1 log:
>
> |CPU:  5  PID:  16617  Comm:  pickupNot  tainted3.10.0-123.13.2.el7.x86_64#1
> [11971.208387]  Hardware  name:  Intel  Corporation  S2600CP/S2600CP,  BIOS SE5C600.86B.02.02.0002.122320131210  12/23/2013
> [11971.208389]   ffff8807de2b1cc800000000a2deb902  ffff8807de2b1c80 ffffffff815e232c
> [11971.208392]   ffff8807de2b1cb8 ffffffff8105dee1 ffff8807f8e85f50 ffff8807f8e85f40
> [11971.208394]   ffff8807f90db0c0 ffff8807f8e85f50 ffff8807f90db0c0 ffff8807de2b1d20
> [11971.208396]  Call  Trace:
> [11971.208401]   [<ffffffff815e232c>]  dump_stack+0x19/0x1b
> [11971.208405]   [<ffffffff8105dee1>]  warn_slowpath_common+0x61/0x80
> [11971.208408]   [<ffffffff8105df5c>]  warn_slowpath_fmt+0x5c/0x80
> [11971.208410]   [<ffffffff812cff82>]  __list_del_entry+0x82/0xd0
> [11971.208412]   [<ffffffff812cffdd>]  list_del+0xd/0x30
> [11971.208415]   [<ffffffff811776a3>]  unlink_anon_vmas+0x93/0x180
> [11971.208418]   [<ffffffff81168b88>]  free_pgtables+0xa8/0x120
> [11971.208420]   [<ffffffff81173556>]  exit_mmap+0xc6/0x1a0
> [11971.208422]   [<ffffffff8105b187>]  mmput+0x67/0xf0
> [11971.208424]   [<ffffffff81063dac>]  do_exit+0x28c/0xa60
> [11971.208426]   [<ffffffff810645ff>]  do_group_exit+0x3f/0xa0
> [11971.208428]   [<ffffffff81064674>]  SyS_exit_group+0x14/0x20
> [11971.208431]   [<ffffffff815f2a19>]  system_call_fastpath+0x16/0x1b
> [11971.208432]  ---[  end  trace ebed116bce4ce8eb]---
> [11971.208437]  BUG:  unable to handle kernel NULL pointer dereference at(null)
> [11971.208471]  IP:  [<ffffffff81177663>]  unlink_anon_vmas+0x53/0x180
> [11971.208493]  PGD0
> [11971.208502]  Oops:  0000  [#1] SMP|
>
> Crash 2 log:
>
> |[321808.123092]  BUG:  unable to handle kernel paging request at ffffc90017456008
> [321808.123122]  IP:  [<ffffffffa03a8521>]  get_counters+0x91/0xd0  [ip_tables]
> [321808.123146]  PGD81d437067  PUD81d4a4067  PMD7ec309067  PTE0
> [321808.123167]  Oops:  0002  [#1] SMP
> [321808.123179]  Modules  linkedin:  dummy vhost_net macvtap macvlan tun iptable_nat nf_nat_ipv4 nf_nat iptable_raw iptable_filter ip_tables nf_conntrack_ipv6 nf_defrag_ipv6 xt_mac xt_physdev xt_set ip_set_hash_ip ip_set nfnetlink veth ip6table_filter ip6_tables ebtable_nat ebtables openvswitch vxlan ip_tunnel gre sg ipt_REJECT xt_comment xt_conntrack xt_multiport nf_conntrack_ipv4 nf_defrag_ipv4 nf_conntrack coretemp kvm_intel kvm crct10dif_pclmul iTCO_wdt iTCO_vendor_support crc32_pclmul crc32c_intel ghash_clmulni_intel sb_edac edac_core pcspkr lpc_ich ioatdma i2c_i801 mfd_core aesni_intel lrw gf128mul glue_helper ablk_helper cryptd mei_me mei shpchp wmi acpi_cpufreq mperf nfsd auth_rpcgss nfs_acl lockd sunrpc bridge stp llc xfs libcrc32c sd_mod crc_t10di
>   f crct10d
>
> if_common mgag200 syscopyarea sysfillrect
> [321808.123452]   sysimgblt drm_kms_helper ttm isci igb ahci drm libsas libahci ptp scsi_transport_sas pps_core dca libata i2c_algo_bit i2c_core dm_mirror dm_region_hash dm_log dm_mod[last  unloaded:  ip_tables]
> [321808.123521]  CPU:  10  PID:  110268  Comm:  iptables-saveNot  tainted3.10.0-123.13.2.el7.x86_64#1
> [321808.123547]  Hardware  name:  Intel  Corporation  S2600CP/S2600CP,  BIOS SE5C600.86B.02.02.0002.122320131210  12/23/2013
> [321808.123577]  task:  ffff88080a8f38e0 ti:  ffff8807ed398000 task.ti:  ffff8807ed398000
> [321808.123599]  RIP:  0010:[<ffffffffa03a8521>]   [<ffffffffa03a8521>]  get_counters+0x91/0xd0  [ip_tables]
> [321808.123627]  RSP:  0018:ffff8807ed399da8  EFLAGS:  00010286
> [321808.123643]  RAX:  ffffc90014ab72e8 RBX:  0000000000010380  RCX:  ffffc90017456000
> [321808.123664]  RDX:  0000000000000054  RSI:  0000000000000000  RDI:  ffff88081e290380
> [321808.123685]  RBP:  ffff8807ed399dc8 R08:  0000000000000101  R09:  ffff8807ed96caa0
> [321808.123706]  R10:  0000000000000000  R11:  ffffffff8117b2e8 R12:  ffffffff819e4aa0
> [321808.123727]  R13:  ffff8807ed96c800 R14:  ffffc90017455000 R15:  ffff88080c961ba0
> [321808.123748]  FS:   00007fdcc2078740(0000)  GS:ffff88081d940000(0000)  knlGS:0000000000000000
> [321808.123772]  CS:   0010  DS:  0000  ES:  0000  CR0:  0000000080050033
> ||[321808.123789] CR2: ffffc90017456008 CR3: 00000007ec30e000 CR4: 00000000001427e0
> [321808.123810] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [321808.123831] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> |
>
> I am not able to debug the problem. The setup was working fine till now.
> I am unable to understand what is cuasing such a behaviour. Please help.
>
>
> Thanks,
>
> Priyanka
>
>
>
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