Kernel Tainted - Mailing list pgsql-hackers

Hi,<div class=""><br class="" /></div><div class="">We are helping a client test an application On Power8 using
Postgres9.5.4 which has been compiled specifically for the Power.</div><div class=""><br class="" /></div><div
class="">Thisis running on sles12sp1  the current kernel is 3.12.49-11</div><div class=""><br class="" /></div><div
class="">Weare getting these kernel warning associated with the postmaster process.  The application is handling around
15000TPS It appears that one of these messages is generated for each each transaction which fills up the warn.log quite
quickly.</div><divclass=""><br class="" /></div><div class="">I’m trying to understand what is causing the Tainted
kernelmessages. the warning is at 'WARNING: at ../net/core/dst.c:287’.  </div><div class="">I’ve found one link that
indicatesthat this is ip6 related.  <a class=""
href="https://brunomgalmeida.wordpress.com/2015/07/23/disable-ipv6-postgres-and-pgbouncer/">https://brunomgalmeida.wordpress.com/2015/07/23/disable-ipv6-postgres-and-pgbouncer/</a></div><div
class="">Isthis accurate?  And if these action resolve the error, is it more of a bandaid then an actual fix?</div><div
class=""><brclass="" /></div><div class="">Any comments are appreciated.</div><div class=""><br class="" /></div><div
class="">Asample of the error is below.</div><div class=""><br class="" /></div><div class="">Reiner</div><div
class=""><brclass="" /></div><div class=""><div class="">2016-10-05T15:08:50.219292+02:00 PPDLMREB04 kernel:
------------[cut here ]------------</div><div class="">2016-10-05T15:08:50.219335+02:00 PPDLMREB04 kernel: WARNING: at
../net/core/dst.c:287</div><divclass="">2016-10-05T15:08:50.219341+02:00 PPDLMREB04 kernel: Modules linked in:
af_packetxfs libcrc32c ibmveth(X) rtc_generic btrfs xor raid6_pq dm_service_time sr_mod sd_mod cdrom crc_t10dif
ibmvfc(X)scsi_transport_fc ibmvscsi(X) scsi_transport_srp scsi_tgt dm_multipath scsi_dh_rdac scsi_dh_emc scsi_dh_alua
scsi_dhdm_mod sg scsi_mod autofs4</div><div class="">2016-10-05T15:08:50.219346+02:00 PPDLMREB04 kernel: Supported:
Yes,External</div><div class="">2016-10-05T15:08:50.219350+02:00 PPDLMREB04 kernel: CPU: 28 PID: 113041 Comm:
postmasterTainted: G               X 3.12.49-11-default #1</div><div class="">2016-10-05T15:08:50.219355+02:00
PPDLMREB04kernel: task: c0000003c31100d0 ti: c0000003c1f08000 task.ti: c0000003c1f08000</div><div
class="">2016-10-05T15:08:50.219362+02:00PPDLMREB04 kernel: NIP: c0000000005c0bb0 LR: c000000000594bc4 CTR:
c0000000006a0ae0</div><divclass="">2016-10-05T15:08:50.219415+02:00 PPDLMREB04 kernel: REGS: c0000003c1f0b630 TRAP:
0700  Tainted: G               X  (3.12.49-11-default)</div><div class="">2016-10-05T15:08:50.219424+02:00 PPDLMREB04
kernel:MSR: 8000000000029033 <SF,EE,ME,IR,DR,RI,LE>  CR: 24022288  XER: 00000016</div><div
class="">2016-10-05T15:08:50.219430+02:00PPDLMREB04 kernel: CFAR: c000000000594bc0 SOFTE: 1 </div><div
class="">2016-10-05T15:08:50.219438+02:00PPDLMREB04 kernel: GPR00: c000000000594bc4 c0000003c1f0b8b0 c000000000e8ff00
c0000003c35a1980 </div><divclass="">2016-10-05T15:08:50.219444+02:00 PPDLMREB04 kernel: GPR04: 0000000000000002
00000000000000000000000000000001 00000000ffff0000 </div><div class="">2016-10-05T15:08:50.219448+02:00 PPDLMREB04
kernel:GPR08: 0000000000000000 0000000000000001 ffffffffffffffff c000000000710810 </div><div
class="">2016-10-05T15:08:50.219452+02:00PPDLMREB04 kernel: GPR12: c0000000006a0ae0 c000000007b2fc00 7fffffffffffffff
000000000000003c </div><divclass="">2016-10-05T15:08:50.219457+02:00 PPDLMREB04 kernel: GPR16: 0000000000000000
00000000107356200000000000000000 0000000000000000 </div><div class="">2016-10-05T15:08:50.219462+02:00 PPDLMREB04
kernel:GPR20: c0000003c1746d80 0000000000000001 0000000000000000 00000000000003a8 </div><div
class="">2016-10-05T15:08:50.219466+02:00PPDLMREB04 kernel: GPR24: c0000003c1f0b9f0 0000000000000000 0000000000000000
00000000000003a8 </div><divclass="">2016-10-05T15:08:50.219470+02:00 PPDLMREB04 kernel: GPR28: 0000000000000002
c0000003c1746a000000000000000000 c0000003c35a1980 </div><div class="">2016-10-05T15:08:50.219475+02:00 PPDLMREB04
kernel:NIP [c0000000005c0bb0] dst_release+0x50/0xa0</div><div class="">2016-10-05T15:08:50.219479+02:00 PPDLMREB04
kernel:LR [c000000000594bc4] sk_dst_check+0x174/0x180</div><div class="">2016-10-05T15:08:50.219484+02:00 PPDLMREB04
kernel:Call Trace:</div><div class="">2016-10-05T15:08:50.219489+02:00 PPDLMREB04 kernel: [c0000003c1f0b8b0]
[c0000000016f7d80]0xc0000000016f7d80 (unreliable)</div><div class="">2016-10-05T15:08:50.219495+02:00 PPDLMREB04
kernel:[c0000003c1f0b8e0] [c000000000594bc4] sk_dst_check+0x174/0x180</div><div
class="">2016-10-05T15:08:50.219501+02:00PPDLMREB04 kernel: [c0000003c1f0b920] [c00000000068d4cc]
ip6_sk_dst_lookup_flow+0x4c/0x2a0</div><divclass="">2016-10-05T15:08:50.219506+02:00 PPDLMREB04 kernel:
[c0000003c1f0b970][c0000000006b16b8] udpv6_sendmsg+0x688/0xb20</div><div class="">2016-10-05T15:08:50.219511+02:00
PPDLMREB04kernel: [c0000003c1f0baf0] [c00000000064b30c] inet_sendmsg+0x9c/0x120</div><div
class="">2016-10-05T15:08:50.219515+02:00PPDLMREB04 kernel: [c0000003c1f0bb40] [c00000000058eabc]
sock_sendmsg+0xec/0x140</div><divclass="">2016-10-05T15:08:50.219519+02:00 PPDLMREB04 kernel: [c0000003c1f0bc60]
[c0000000005921a8]SyS_sendto+0x108/0x150</div><div class="">2016-10-05T15:08:50.219524+02:00 PPDLMREB04 kernel:
[c0000003c1f0bd80][c000000000592240] SyS_send+0x50/0x70</div><div class="">2016-10-05T15:08:50.219530+02:00 PPDLMREB04
kernel:[c0000003c1f0bdc0] [c0000000005933f0] SyS_socketcall+0x2a0/0x440</div><div
class="">2016-10-05T15:08:50.219534+02:00PPDLMREB04 kernel: [c0000003c1f0be30] [c00000000000a17c]
syscall_exit+0x0/0x7c</div><divclass="">2016-10-05T15:08:50.219541+02:00 PPDLMREB04 kernel: Instruction dump:</div><div
class="">2016-10-05T15:08:50.219547+02:00PPDLMREB04 kernel: 60000000 2fbf0000 419e0038 395f0080 7c2004ac 7d205028
3129ffff7d20512d </div><div class="">2016-10-05T15:08:50.219553+02:00 PPDLMREB04 kernel: 40c2fff4 7c0004ac 7d2a07b4
55290ffe<0b090000> a13f0060 7928e7e3 40c20018 </div><div class="">2016-10-05T15:08:50.219557+02:00 PPDLMREB04
kernel:---[ end trace a13ca043356ba634 ]---</div><div class=""><div class="">2016-10-05T15:08:54.230104+02:00
PPDLMREB04kernel: ------------[ cut here ]------------</div><div class="">2016-10-05T15:08:54.230134+02:00 PPDLMREB04
kernel:WARNING: at ../net/core/dst.c:287</div><div class="">2016-10-05T15:08:54.230138+02:00 PPDLMREB04 kernel: Modules
linkedin: af_packet xfs libcrc32c ibmveth(X) rtc_generic btrfs xor raid6_pq dm_service_time sr_mod sd_mod cdrom
crc_t10difibmvfc(X) scsi_transport_fc ibmvscsi(X) scsi_transport_srp scsi_tgt dm_multipath scsi_dh_rdac scsi_dh_emc
scsi_dh_aluascsi_dh dm_mod sg scsi_mod autofs4</div><div class="">2016-10-05T15:08:54.230142+02:00 PPDLMREB04 kernel:
Supported:Yes, External</div><div class="">2016-10-05T15:08:54.230171+02:00 PPDLMREB04 kernel: CPU: 30 PID: 113103
Comm:postmaster Tainted: G        W      X 3.12.49-11-default #1</div><div class="">2016-10-05T15:08:54.230174+02:00
PPDLMREB04kernel: task: c0000003ba9d03d0 ti: c0000003bcb20000 task.ti: c0000003bcb20000</div><div
class="">2016-10-05T15:08:54.230176+02:00PPDLMREB04 kernel: NIP: c0000000005c0bb0 LR: c000000000594bc4 CTR:
c0000000006a0ae0</div><divclass="">2016-10-05T15:08:54.230178+02:00 PPDLMREB04 kernel: REGS: c0000003bcb23630 TRAP:
0700  Tainted: G        W      X  (3.12.49-11-default)</div><div class="">2016-10-05T15:08:54.230180+02:00 PPDLMREB04
kernel:MSR: 8000000000029033 <SF,EE,ME,IR,DR,RI,LE>  CR: 24022488  XER: 00000011</div><div
class="">2016-10-05T15:08:54.230182+02:00PPDLMREB04 kernel: CFAR: c000000000594bc0 SOFTE: 1 </div><div
class="">2016-10-05T15:08:54.230184+02:00PPDLMREB04 kernel: GPR00: c000000000594bc4 c0000003bcb238b0 c000000000e8ff00
c0000003c35a1980 </div><divclass="">2016-10-05T15:08:54.230185+02:00 PPDLMREB04 kernel: GPR04: 0000000000000002
00000000000000000000000000000001 00000000ffff0000 </div><div class="">2016-10-05T15:08:54.230187+02:00 PPDLMREB04
kernel:GPR08: 0000000000000000 0000000000000001 ffffffffffffffff c000000000710810 </div><div
class="">2016-10-05T15:08:54.230189+02:00PPDLMREB04 kernel: GPR12: c0000000006a0ae0 c000000007b30e00 7fffffffffffffff
000000000000003c </div><divclass="">2016-10-05T15:08:54.230191+02:00 PPDLMREB04 kernel: GPR16: 0000000000000000
00000000107356200000000000000000 0000000000000000 </div><div class="">2016-10-05T15:08:54.230192+02:00 PPDLMREB04
kernel:GPR20: c0000003c1746d80 0000000000000001 0000000000000000 00000000000003a8 </div><div
class="">2016-10-05T15:08:54.230194+02:00PPDLMREB04 kernel: GPR24: c0000003bcb239f0 0000000000000000 0000000000000000
00000000000003a8 </div><divclass="">2016-10-05T15:08:54.230196+02:00 PPDLMREB04 kernel: GPR28: 0000000000000002
c0000003c1746a000000000000000000 c0000003c35a1980 </div><div class="">2016-10-05T15:08:54.230198+02:00 PPDLMREB04
kernel:NIP [c0000000005c0bb0] dst_release+0x50/0xa0</div><div class="">2016-10-05T15:08:54.230199+02:00 PPDLMREB04
kernel:LR [c000000000594bc4] sk_dst_check+0x174/0x180</div><div class="">2016-10-05T15:08:54.230201+02:00 PPDLMREB04
kernel:Call Trace:</div><div class="">2016-10-05T15:08:54.230202+02:00 PPDLMREB04 kernel: [c0000003bcb238b0]
[c000000001657d80]0xc000000001657d80 (unreliable)</div><div class="">2016-10-05T15:08:54.230205+02:00 PPDLMREB04
kernel:[c0000003bcb238e0] [c000000000594bc4] sk_dst_check+0x174/0x180</div><div
class="">2016-10-05T15:08:54.230207+02:00PPDLMREB04 kernel: [c0000003bcb23920] [c00000000068d4cc]
ip6_sk_dst_lookup_flow+0x4c/0x2a0</div><divclass="">2016-10-05T15:08:54.230209+02:00 PPDLMREB04 kernel:
[c0000003bcb23970][c0000000006b16b8] udpv6_sendmsg+0x688/0xb20</div><div class="">2016-10-05T15:08:54.230212+02:00
PPDLMREB04kernel: [c0000003bcb23af0] [c00000000064b30c] inet_sendmsg+0x9c/0x120</div><div
class="">2016-10-05T15:08:54.230214+02:00PPDLMREB04 kernel: [c0000003bcb23b40] [c00000000058eabc]
sock_sendmsg+0xec/0x140</div><divclass="">2016-10-05T15:08:54.230216+02:00 PPDLMREB04 kernel: [c0000003bcb23c60]
[c0000000005921a8]SyS_sendto+0x108/0x150</div><div class="">2016-10-05T15:08:54.230217+02:00 PPDLMREB04 kernel:
[c0000003bcb23d80][c000000000592240] SyS_send+0x50/0x70</div><div class="">2016-10-05T15:08:54.230219+02:00 PPDLMREB04
kernel:[c0000003bcb23dc0] [c0000000005933f0] SyS_socketcall+0x2a0/0x440</div><div
class="">2016-10-05T15:08:54.230221+02:00PPDLMREB04 kernel: [c0000003bcb23e30] [c00000000000a17c]
syscall_exit+0x0/0x7c</div><divclass="">2016-10-05T15:08:54.230222+02:00 PPDLMREB04 kernel: Instruction dump:</div><div
class="">2016-10-05T15:08:54.230225+02:00PPDLMREB04 kernel: 60000000 2fbf0000 419e0038 395f0080 7c2004ac 7d205028
3129ffff7d20512d </div><div class="">2016-10-05T15:08:54.230227+02:00 PPDLMREB04 kernel: 40c2fff4 7c0004ac 7d2a07b4
55290ffe<0b090000> a13f0060 7928e7e3 40c20018 </div><div class="">2016-10-05T15:08:54.230229+02:00 PPDLMREB04
kernel:---[ end trace a13ca043356ba635 ]---</div></div></div>