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Instance Crash With: "BUG: unable to handle kernel NULL pointer dereference at 0000000000000078" (Doc ID 2610280.1)

Last updated on DECEMBER 10, 2019

Applies to:

Oracle Cloud Infrastructure - Version N/A and later
Linux x86-64

Symptoms

System running with Kernel: 4.14.35-1818.3.3.el7uek crash with the following panic message:

[238684.796888] BUG: unable to handle kernel NULL pointer dereference at 0000000000000078
[238684.800847] IP: __iscsi_get_task+0x9/0x20 [libiscsi]
[238684.802366] PGD 0 P4D 0 
[238684.803132] Oops: 0002 [#1] SMP PTI
[238684.804137] Modules linked in: unix_diag bochs_drm ttm drm_kms_helper kvm_intel drm kvm syscopyarea irqbypass sysfillrect sysimgblt fb_sys_fops i2c_piix4 pcspkr sg binfmt_misc ip_tables vfat fat xfs libcrc32c sd_mod be2iscsi bnx2i cnic uio cxgb4i cxgb4 ptp pps_core cxgb3i cxgb3 mdio crct10dif_pclmul libcxgbi crc32_pclmul crc32c_intel libcxgb qla4xxx ghash_clmulni_intel pcbc iscsi_boot_sysfs aesni_intel ata_generic pata_acpi ata_piix crypto_simd glue_helper floppy libata bnxt_en cryptd serio_raw sunrpc dm_mirror dm_region_hash dm_log dm_mod iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi
[238684.818626] CPU: 8 PID: 32736 Comm: kworker/u32:0 Not tainted 4.14.35-1818.3.3.el7uek.x86_64 #2
[238684.821062] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 0.0.0 02/06/2015
[238684.823327] Workqueue: iscsi_q_2 iscsi_xmitworker [libiscsi]
[238684.824926] task: ffff92fde1661e80 task.stack: ffffa9c710b18000
[238684.826608] RIP: 0010:__iscsi_get_task+0x9/0x20 [libiscsi]
[238684.828151] RSP: 0018:ffffa9c710b1bdd8 EFLAGS: 00010246
[238684.829631] RAX: 00000000ffffffc3 RBX: ffff92fe3d0e4338 RCX: ffff92fe3d022480
[238684.831620] RDX: 0000000000000000 RSI: 00000000fffffe01 RDI: 0000000000000000
[238684.833614] RBP: ffffa9c710b1bdd8 R08: 0000000000000000 R09: 0000000000000018
[238684.835586] R10: ffff92fe44eb1958 R11: 00000000000022f4 R12: 0000000000000000
[238684.837563] R13: ffff92fe3d0e4338 R14: ffff92fe3d0e43e8 R15: ffff92fe3c8d1c80
[238684.839550] FS:  0000000000000000(0000) GS:ffff92fe47400000(0000) knlGS:0000000000000000
[238684.841814] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[238684.843443] CR2: 0000000000000078 CR3: 00000001b040a002 CR4: 00000000003606e0
[238684.845454] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[238684.847452] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[238684.849451] Call Trace:
[238684.850207]  iscsi_xmit_task+0x31/0xd0 [libiscsi]
[238684.851541]  iscsi_xmitworker+0x242/0x3d0 [libiscsi]
[238684.853708]  process_one_work+0x169/0x395
[238684.854882]  worker_thread+0x4d/0x3e5
[238684.855935]  kthread+0x105/0x138
[238684.856872]  ? rescuer_thread+0x380/0x375
[238684.858016]  ? kthread_bind+0x20/0x15
[238684.859071]  ? do_syscall_64+0x79/0x1ae
[238684.860185]  ret_from_fork+0x1f/0x40
[238684.861191] Code: <f0> ff 47 78 0f 88 15 64 00 00 5d c3 90 66 2e 0f 1f 84 00 00 00 00 
[238684.863414] RIP: __iscsi_get_task+0x9/0x20 [libiscsi] RSP: ffffa9c710b1bdd8
[238684.865364] CR2: 0000000000000078 

Cause

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In this Document
Symptoms
Cause
Solution
References


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