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OL7/UEK5 Virtual Machine Crashes with "BUG: unable to handle kernel NULL pointer dereference at 000000000000002c" (Doc ID 2589334.1)

Last updated on JUNE 09, 2020

Applies to:

Linux OS - Version Oracle Linux 7.5 with Unbreakable Enterprise Kernel [4.14.35] and later
Oracle VM - Version 3.4.6 to 3.4.6 [Release OVM34]
Linux x86-64

Symptoms

Oracle Linux 7 with UEK5 kernel might crash with call stack like below, 

[117547.319194] BUG: unable to handle kernel NULL pointer dereference at 000000000000002c
[117547.326434] IP: xennet_poll+0x2bb/0xb30 [xen_netfront]
[117547.331192] PGD 0 P4D 0
[117547.333680] Oops: 0000 [#1] SMP PTI
[117547.336958] Modules linked in: cmac nfsv3 arc4 ecb nfs md4 nls_utf8 cifs ccm dns_resolver fscache ip6t_rpfilter ipt_REJECT nf_reject_ipv4 ip6t_REJECT nf_reject_ipv6 xt_conntrack ip_set nfnetlink ebtable_nat ebtable_broute bridge stp llc ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ext4 mbcache jbd2 fscrypto sb_edac crct10dif_pclmul ppdev crc32_pclmul ghash_clmulni_intel pcbc xen_fbfront aesni_intel crypto_simd glue_helper cryptd i2c_piix4 pcspkr parport_pc parport nfsd nfs_acl lockd auth_rpcgss binfmt_misc grace sunrpc ip_tables xfs libcrc32c ata_generic
[117547.386004]  pata_acpi xen_netfront xen_blkfront cirrus drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm ata_piix drm libata crc32c_intel serio_raw floppy dm_mirror dm_region_hash dm_log dm_mod
[117547.398877] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.14.35-1902.3.1.el7uek.x86_64 #2
[117547.404403] Hardware name: Xen HVM domU, BIOS 4.4.4OVM 09/06/2018
[117547.408670] task: ffffffff84412480 task.stack: ffffffff84400000
[117547.412820] RIP: 0010:xennet_poll+0x2bb/0xb30 [xen_netfront]
[117547.416793] RSP: 0018:ffff99ccad603dd8 EFLAGS: 00010283
[117547.420512] RAX: 00000000000000e6 RBX: 0000000000000000 RCX: ffff99cc84252900
[117547.425521] RDX: 0000000000000000 RSI: ffff99cbd7580820 RDI: 00000000ffffffff
[117547.430490] RBP: ffff99ccad603ed8 R08: ffff99cbd7580028 R09: 0000000000000000
[117547.435495] R10: 0000000000000000 R11: 0000000080000000 R12: ffff99ccad603e80
[117547.440515] R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000
[117547.445542] FS:  0000000000000000(0000) GS:ffff99ccad600000(0000) knlGS:0000000000000000
[117547.451197] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[117547.455243] CR2: 000000000000002c CR3: 00000009b240a001 CR4: 00000000000606f0
[117547.460324] Call Trace:
[117547.462122]  <IRQ>
[117547.463648]  net_rx_action+0x289/0x3f4
[117547.467678]  __do_softirq+0xd9/0x28d
[117547.471584]  irq_exit+0xdf/0xe5
[117547.475189]  xen_evtchn_do_upcall+0x30/0x3b
[117547.479499]  xen_hvm_callback_vector+0x1ba/0x1bf
[117547.484123]  </IRQ>
[117547.487065] RIP: 0010:native_safe_halt+0x12/0x14
[117547.491653] RSP: 0018:ffffffff84403e18 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff0c
[117547.498322] RAX: ffffffff83869dc0 RBX: ffffffff84412480 RCX: 0000000000000000
[117547.504649] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[117547.511019] RBP: ffffffff84403e18 R08: ffffa90cc9ef7e88 R09: 0000000000000000
[117547.517378] R10: 0000000000000207 R11: 00000000000000ca R12: 0000000000000000
[117547.523794] R13: ffffffff84412480 R14: 0000000000000000 R15: 0000000000000000
[117547.530287]  ? __sched_text_end+0x5/0x0
[117547.534486]  default_idle+0x1e/0xfc
[117547.538484]  arch_cpu_idle+0x15/0x17
[117547.542425]  default_idle_call+0x23/0x31
[117547.546556]  do_idle+0x158/0x1d5
[117547.550258]  cpu_startup_entry+0x73/0x75
[117547.554374]  rest_init+0xaa/0xac
[117547.558004]  start_kernel+0x540/0x561
[117547.561906]  ? set_init_arg+0x5a/0x5a
[117547.565797]  x86_64_start_reservations+0x32/0x34
[117547.570367]  x86_64_start_kernel+0x74/0x77
[117547.574509]  secondary_startup_64+0xa5/0xa5
[117547.578741] Code: b4 1d 00 00 00 00 00 00 41 0f b7 44 24 06 66 85 c0 0f 88 e3 06 00 00 41 0f b7 54 24 02 98 01 d0 3d 00 10 00 00 0f 87 cf 06 00 00 <8b> 7b 2c 85 ff 0f 85 4f ff ff ff 45 85 f6 4c 89 85 48 ff ff ff
[117547.594204] RIP: xennet_poll+0x2bb/0xb30 [xen_netfront] RSP: ffff99ccad603dd8
[117547.600402] CR2: 000000000000002c
[117547.603985] ---[ end trace dab3ef40322cd973 ]---
[117547.608419] Kernel panic - not syncing: Fatal exception in interrupt
[117547.614666] Kernel Offset: 0x2000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)

 

Changes

You recently upgraded UEK3 or UEK4 kernel to UEK5 kernel 

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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