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Oracle Linux: Kernel Panic on "iscsit_map_iovec" (Doc ID 2674957.1)

Last updated on JUNE 24, 2020

Applies to:

Linux OS - Version Oracle Linux 7.6 and later
Linux x86-64


An unexpected OS reboot occurred suddenly. According to the below back trace for vmcore, the kernel panic occurred on iscsit_map_iovec.

crash> bt
PID: 290667 TASK: ffff885e86a58000 CPU: 10 COMMAND: "iscsi_ttx"
#0 [ffff882b27ff7950] machine_kexec at ffffffff8106299b
#1 [ffff882b27ff79c0] crash_kexec at ffffffff8111bff2
#2 [ffff882b27ff7a90] oops_end at ffffffff8101b938
#3 [ffff882b27ff7ac0] no_context at ffffffff81745a9c
#4 [ffff882b27ff7b20] __bad_area_nosemaphore at ffffffff81745b84
#5 [ffff882b27ff7b70] bad_area_nosemaphore at ffffffff81745cf0
#6 [ffff882b27ff7b80] __do_page_fault at ffffffff810713a6
#7 [ffff882b27ff7bf0] do_page_fault at ffffffff810717b0
#8 [ffff882b27ff7c30] page_fault at ffffffff81759def
[exception RIP: iscsit_map_iovec+99]
RIP: ffffffffa063f523 RSP: ffff882b27ff7ce0 RFLAGS: 00010246
RAX: ffff882b165a8140 RBX: ffff882b165a8140 RCX: 0000000000001000
RDX: 0000000000000000 RSI: ffff88298995bf10 RDI: ffff882b165a8140
RBP: ffff882b27ff7d30 R8: 0000000000000000 R9: 0000000000000000
R10: 0000000000040000 R11: ffffea00abc23780 R12: 0000000000000000
R13: 0000000000001000 R14: 0000000000000000 R15: 0000000000000000
ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018
#9 [ffff882b27ff7d38] iscsit_response_queue at ffffffffa0644d2f
#10 [ffff882b27ff7e40] iscsi_target_tx_thread at ffffffffa06423cf
#11 [ffff882b27ff7ec0] kthread at ffffffff810ac4aa
#12 [ffff882b27ff7f50] ret_from_fork at ffffffff81754ae7


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