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Oracle Linux: Server Auto Reboots Continuously "BUG: unable to handle kernel paging request at ffffffffaf2badc0" "COMMAND: "bpftool"" (Doc ID 2693380.1)

Last updated on JULY 27, 2020

Applies to:

Linux OS - Version Oracle Linux 7.7 and later
Linux x86-64

Symptoms

Server will not be stable. After a complete server startup, it waits for few seconds then the server will crash and will go for a reboot. This cycle repeats continuously. Server doesn't stay stable when booted with older kernel as well. The server seems to be stable in rescue mode. So that confirms no hardware issue. 

Here is the call stack details from crash dump.

VMCORE
=====
KERNEL: /share/linuxrpm/vmlinux_repo/64/3.10.0-1062.18.1.el7.x86_64/vmlinux
DUMPFILE: vmcore [PARTIAL DUMP]
CPUS: 48
DATE: Mon Jul 13 03:15:57 2020
UPTIME: 00:01:01
LOAD AVERAGE: 2.84, 0.93, 0.33
TASKS: 1246
NODENAME: <hostname>
RELEASE: 3.10.0-1062.18.1.el7.x86_64
VERSION: #1 SMP Wed Mar 18 11:05:28 PDT 2020
MACHINE: x86_64 (2300 Mhz)
MEMORY: 1534.5 GB
PANIC: "BUG: unable to handle kernel paging request at ffffffffaf2badc0"
PID: 29729
COMMAND: "bpftool" <<<<<===================================
TASK: ffff93c33d5cd230 [THREAD_INFO: ffff93bfdcf8c000]
CPU: 4
STATE: TASK_RUNNING (PANIC)
crash7latest> bt
PID: 29729 TASK: ffff93c33d5cd230 CPU: 4 COMMAND: "bpftool"
#0 [ffff93bfdcf8fb30] machine_kexec at ffffffffae665b34
#1 [ffff93bfdcf8fb90] __crash_kexec at ffffffffae722592
#2 [ffff93bfdcf8fc60] crash_kexec at ffffffffae722680
#3 [ffff93bfdcf8fc78] oops_end at ffffffffaed85798
#4 [ffff93bfdcf8fca0] no_context at ffffffffae675bb4
#5 [ffff93bfdcf8fcf0] __bad_area_nosemaphore at ffffffffae675e82
#6 [ffff93bfdcf8fd40] bad_area_nosemaphore at ffffffffae675fa4
#7 [ffff93bfdcf8fd50] __do_page_fault at ffffffffaed88750
#8 [ffff93bfdcf8fdc0] do_page_fault at ffffffffaed88975
#9 [ffff93bfdcf8fdf0] page_fault at ffffffffaed84778
[exception RIP: default_security_ops]
RIP: ffffffffaf2badc0 RSP: ffff93bfdcf8fea0 RFLAGS: 00010246
RAX: ffffffffaf2badc0 RBX: ffff93bfdcf8fed0 RCX: 0000000000000000
RDX: 0000000000000048 RSI: ffff93bfdcf8fed0 RDI: 000000000000000b
RBP: ffff93bfdcf8fea8 R8: ffff93bfdcf90000 R9: 00000000ffffffff
R10: 000000000000144a R11: 0000000000000001 R12: 0000000000000048
R13: 00007fffbe77c150 R14: 000000000000000b R15: 0000000000000048
ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018
#10 [ffff93bfdcf8fea0] security_bpf at ffffffffae90552c
#11 [ffff93bfdcf8feb0] sys_bpf at ffffffffae792ebe
#12 [ffff93bfdcf8ff50] system_call_fastpath at ffffffffaed8dede
RIP: 00007fb637b6ebe9 RSP: 00007fffbe77c1a8 RFLAGS: 00010202
RAX: 0000000000000141 RBX: 00007fffbe77c2f8 RCX: 00000000ffffffff
RDX: 0000000000000048 RSI: 00007fffbe77c150 RDI: 000000000000000b
RBP: 00007fffbe77c130 R8: 0000000000000000 R9: 00007fffbe77c150
R10: ffffffffffffffff R11: 0000000000000206 R12: 00007fffbe77c1cc
R13: 00007fffbe77c2e0 R14: 0000000000000000 R15: 0000000000000000
ORIG_RAX: 0000000000000141 CS: 0033 SS: 002b
vmcore-dmesg.txt
----------------------
[ 48.522659] cbp sensor: off
[ 61.527546] TECH PREVIEW: eBPF syscall may not be fully supported.
Please review provided documentation for limitations.
[ 61.529180] kernel tried to execute NX-protected page - exploit attempt? (uid: 0)
[ 61.529931] BUG: unable to handle kernel paging request at ffffffffaf2badc0 <<<<==========
[ 61.530681] IP: [<ffffffffaf2badc0>] default_security_ops+0x0/0x6a0
[ 61.531438] PGD 3d3ac14067 PUD 3d3ac15063 PMD bd39502063 PTE 8000003d3acba063
[ 61.532188] Oops: 0011 [#1] SMP
[ 61.532922] Modules linked in: nfsv3 nfs_acl nfs lockd grace fscache dm_service_time dm_round_robin dm_multipath sunrpc dell_smbios dell_wmi_descriptor dcdbas skx_edac intel_powerclamp coretemp intel_rapl iosf_mbi kvm irqbypass crc32_pclmul ghash_clmulni_intel aesni_intel lrw gf128mul glue_helper ablk_helper cryptd wdat_wdt pcspkr ipmi_ssif mgag200 i2c_algo_bit ttm drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops drm lpc_ich i2c_i801 drm_panel_orientation_quirks mei_me mei wmi ipmi_si ipmi_devintf ipmi_msghandler acpi_power_meter acpi_pad pcc_cpufreq b9k_742120(POE) sg cbproxy_cbp_742_20190815(POE) binfmt_misc ip_tables xfs libcrc32c raid1 sr_mod cdrom sd_mod lpfc nvmet_fc nvmet crc_t10dif crct10dif_generic ahci nvme_fc nvme_fabrics libahci crct10dif_pclmul bnxt_en nvme_core crc32c_intel
[ 61.537758] tg3 libata scsi_transport_fc megaraid_sas scsi_tgt devlink crct10dif_common ptp pps_core nfit libnvdimm dm_mirror dm_region_hash dm_log dm_mod
[ 61.539421] CPU: 4 PID: 29729 Comm: bpftool Kdump: loaded Tainted: P OE ------------ T 3.10.0-1062.18.1.el7.x86_64 #1
[ 61.541089] Hardware name: <hardware_vendor>, BIOS 2.2.11 06/13/2019
[ 61.541944] task: ffff93c33d5cd230 ti: ffff93bfdcf8c000 task.ti: ffff93bfdcf8c000
[ 61.542806] RIP: 0010:[<ffffffffaf2badc0>] [<ffffffffaf2badc0>] default_security_ops+0x0/0x6a0
[ 61.543683] RSP: 0018:ffff93bfdcf8fea0 EFLAGS: 00010246
[ 61.544541] RAX: ffffffffaf2badc0 RBX: ffff93bfdcf8fed0 RCX: 0000000000000000
[ 61.545393] RDX: 0000000000000048 RSI: ffff93bfdcf8fed0 RDI: 000000000000000b
[ 61.546244] RBP: ffff93bfdcf8fea8 R08: ffff93bfdcf90000 R09: 00000000ffffffff
[ 61.547091] R10: 000000000000144a R11: 0000000000000001 R12: 0000000000000048
[ 61.547935] R13: 00007fffbe77c150 R14: 000000000000000b R15: 0000000000000048
[ 61.548776] FS: 00007fb638686740(0000) GS:ffff93d9ff280000(0000) knlGS:0000000000000000
[ 61.549625] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 61.550469] CR2: ffffffffaf2badc0 CR3: 000000a5578b2000 CR4: 00000000007607e0

Cause

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In this Document
Symptoms
Cause
Solution


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