Db2 crashed with signal 11 in system call

Symptom

Checking db2diag.log:

# online backup started on partition 16, db2sysc pid = 23850
2018-06-30-21.14.58.006081+480 E17937688E492         LEVEL: Info
PID     : 23850                TID : 140414715684608 PROC : db2sysc 16
INSTANCE: db2inst1             NODE : 016            DB   : SAMPLE
APPHDL  : 0-20747              APPID: *N0.db2inst1.180630131457
AUTHID  : DB2INST1             HOSTNAME: myhost1
EDUID   : 12898                EDUNAME: db2agntp (SAMPLE) 16
FUNCTION: DB2 UDB, database utilities, sqlubSetupJobControl, probe:1897
MESSAGE : Starting an online db backup.

# db2sysc 23850 trapped with signal 11
2018-06-30-21.56.55.506820+480 E17971971E471         LEVEL: Error
PID     : 23591                TID : 139658025494272 PROC : db2wdog 16 [db2inst1]
INSTANCE: db2inst1             NODE : 016
HOSTNAME: myhost1
EDUID   : 2                    EDUNAME: db2wdog 16 [db2inst1]
FUNCTION: DB2 UDB, base sys utilities, sqleWatchDog, probe:9064
DATA #1 : Process ID, 4 bytes
23850
DATA #2 : Hexdump, 8 bytes
0x00007F04AAFFD268 : 0101 0000 0B00 0000                        ........

Given FODC is not created in db2dump path,  checking syslog(i.e. /var/log/messages) to see if any further clue(s) , see this:

<<<
Jun 30 21:50:40 myhost1 avahi-daemon[3407]: Withdrawing address record for fe80::42f2:e9ff:fe63:2218 on eno1.
Jun 30 21:51:07 myhost1 kernel: mm/memory.c:401: bad pmd ffff88f7747a54f8(80000071708000e7)
Jun 30 21:51:08 myhost1 abrt-hook-ccpp: Can't open 'core.23850' at '/': Permission denied
<skipped>
Jun 30 21:55:04 myhost1 abrt-hook-ccpp: /var/spool/abrt is 35203441407 bytes (more than 1279MiB), deleting 'oops-2018-06-19-19:15:33-30698-0'
Jun 30 21:55:04 myhost1 abrt-server: Executable '/home/db2inst1/sqllib/adm/db2sysc' doesn't belong to any package and ProcessUnpackaged is set to 'no'
Jun 30 21:55:04 myhost1 abrt-server: 'post-create' on '/var/spool/abrt/ccpp-2018-06-30-21:51:08-23850' exited with 1
Jun 30 21:55:04 myhost1 abrt-server: Deleting problem directory '/var/spool/abrt/ccpp-2018-06-30-21:51:08-23850'
Jun 30 21:55:05 myhost1 kernel: ------------[ cut here ]------------
Jun 30 21:55:05 myhost1 kernel: WARNING: at mm/mmap.c:2773 exit_mmap+0x196/0x1a0()
Jun 30 21:55:05 myhost1 kernel: Modules linked in: btrfs zlib_deflate raid6_pq xor msdos ext4 mbcache jbd2 tcp_lp bnep bluetooth rfkill vxglm(POE) dmpjbod(POE) dmpap(POE) dmpaa(POE) fuse xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT tun bridge stp llc ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter vxspec(POE) vxio(POE) vxdmp(POE) vxcafs(POE) vxportal(POE) fdd(POE) vxfs(POE) veki(POE) xprtrdma ib_isert iscsi_target_mod ib_iser libiscsi scsi_transport_iscsi ib_srpt target_core_mod ib_srp scsi_transport_srp ib_ipoib rdma_ucm ib_ucm ib_uverbs ib_umad rdma_cm ib_cm iw_cm ib_sa ib_mad ocrdma ib_core ib_addr iTCO_wdt iTCO_vendor_support ipmi_devintf intel_powerclamp coretemp kvm dm_service_time
Jun 30 21:55:05 myhost1 kernel: crc32_pclmul ghash_clmulni_intel aesni_intel vfat lrw fat gf128mul glue_helper ablk_helper cryptd pcspkr ipmi_ssif cdc_ether osst usbnet mii lpc_ich st ipmi_si ioatdma i2c_i801 sg i7core_edac ipmi_msghandler mfd_core wmi shpchp dca edac_core acpi_cpufreq nfsd auth_rpcgss nfs_acl lockd grace binfmt_misc sunrpc dm_multipath ip_tables xfs libcrc32c sr_mod cdrom sd_mod ata_generic pata_acpi mgag200 syscopyarea sysfillrect sysimgblt i2c_algo_bit drm_kms_helper lpfc ttm crc_t10dif be2net crct10dif_generic scsi_transport_fc ata_piix crct10dif_pclmul vxlan drm serio_raw crc32c_intel ip6_udp_tunnel scsi_tgt libata megaraid_sas bnx2 i2c_core udp_tunnel crct10dif_common dm_mirror dm_region_hash dm_log dm_mod
Jun 30 21:55:05 myhost1 kernel: CPU: 38 PID: 33840 Comm: db2sysc Tainted: P          IOE  ------------   3.10.0-327.el7.x86_64 #1
Jun 30 21:55:05 myhost1 kernel: Hardware name: IBM System x3850 X5 -[71437HM]-/Node 1, Processor Card, BIOS -[G0E179BUS-1.79]- 07/28/2013
Jun 30 21:55:05 myhost1 kernel: 0000000000000000 000000001bd3ce81 ffff88db79783bc8 ffffffff816351f1
Jun 30 21:55:05 myhost1 kernel: ffff88db79783c00 ffffffff8107b200 00000000000245c3 ffff88fc2ad05140
Jun 30 21:55:05 myhost1 kernel: ffff88fc2ad051b8 ffff8865a8fe6440 ffff88e9f3276780 ffff88db79783c10
Jun 30 21:55:05 myhost1 kernel: Call Trace:
Jun 30 21:55:05 myhost1 kernel: [<ffffffff816351f1>] dump_stack+0x19/0x1b
Jun 30 21:55:05 myhost1 kernel: [<ffffffff8107b200>] warn_slowpath_common+0x70/0xb0
Jun 30 21:55:05 myhost1 kernel: [<ffffffff8107b34a>] warn_slowpath_null+0x1a/0x20
Jun 30 21:55:05 myhost1 kernel: [<ffffffff8119e916>] exit_mmap+0x196/0x1a0
Jun 30 21:55:05 myhost1 kernel: [<ffffffff810782b7>] mmput+0x67/0xf0
Jun 30 21:55:05 myhost1 kernel: [<ffffffff810815ac>] do_exit+0x28c/0xa60
Jun 30 21:55:05 myhost1 kernel: [<ffffffff810a6ae0>] ? wake_up_atomic_t+0x30/0x30
Jun 30 21:55:05 myhost1 kernel: [<ffffffff81081dff>] do_group_exit+0x3f/0xa0
Jun 30 21:55:05 myhost1 kernel: [<ffffffff81092c10>] get_signal_to_deliver+0x1d0/0x6d0
Jun 30 21:55:05 myhost1 kernel: [<ffffffff81014417>] do_signal+0x57/0x6c0
Jun 30 21:55:05 myhost1  kernel: [<ffffffff8162e498>] ? __bad_area_nosemaphore+0x1bd/0x1ca
Jun 30 21:55:05 myhost1 kernel: [<ffffffff8162e6c7>] ? bad_area+0x43/0x4a
Jun 30 21:55:05 myhost1 kernel: [<ffffffff81641035>] ? __do_page_fault+0x365/0x420
Jun 30 21:55:05 myhost1 kernel: [<ffffffff81014adf>] do_notify_resume+0x5f/0xb0
Jun 30 21:55:05 myhost1 kernel: [<ffffffff8163d1fc>] retint_signal+0x48/0x8c
Jun 30 21:55:05 myhost1 kernel: ---[ end trace 39f39ed52aac9358 ]---
Jun 30 21:55:05 myhost1 kernel: BUG: Bad rss-counter state mm:ffff88fc2ad05140 idx:1 val:512

>>>

Above shows the process db2sysc 23850 terminated abnormally in kernel memory.c.