Issue

• During continous IO (dd command is executed) and device removal testing, kernel results in panic. Following bt trace is obtained.

PID: 12     TASK: ffff88012c82aaa0  CPU: 1   COMMAND: "events/1"
#0 [ffff88012c851900] machine_kexec at ffffffff8103281b
#1 [ffff88012c851960] crash_kexec at ffffffff810ba662
#2 [ffff88012c851a30] oops_end at ffffffff81501290
#3 [ffff88012c851a60] no_context at ffffffff81043bab
#4 [ffff88012c851ab0] __bad_area_nosemaphore at ffffffff81043e35
#5 [ffff88012c851b00] bad_area_nosemaphore at ffffffff81043f03
#6 [ffff88012c851b10] __do_page_fault at ffffffff81044661
#7 [ffff88012c851c30] do_page_fault at ffffffff8150326e
#8 [ffff88012c851c60] page_fault at ffffffff81500625
    [exception RIP: list_del+16]
    RIP: ffffffff81282f00  RSP: ffff88012c851d10  RFLAGS: 00010082
    RAX: 0000000000000000  RBX: ffff8800c7db4000  RCX: 000000000000100c
    RDX: ffff88012d3e24c0  RSI: ffff88012d3e24c0  RDI: ffff8800c7db4000
    RBP: ffff88012c851d20   R8: ffff88012d3e24c0   R9: 0000000000000000
    R10: 0000000000000013  R11: 0000000000002000  R12: 000000000000000b
    R13: ffff88012d3ed820  R14: 0000000000000001  R15: ffffea0000000000
    ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
#9 [ffff88012c851d28] free_block at ffffffff81163ed8
#10 [ffff88012c851d88] drain_array at ffffffff811641b1
#11 [ffff88012c851dd8] cache_reap at ffffffff8116517e
#12 [ffff88012c851e38] worker_thread at ffffffff8108c760
#13 [ffff88012c851ee8] kthread at ffffffff81091d66
#14 [ffff88012c851f48] kernel_thread at ffffffff8100c14a

• Due to some security reasons, we cannot share the SOS report/vmcore. But we are providing following crash command outputs to you:

1) bt 
2) bt -a 
3) kmem -i 
4) mod -t 
5) ps 
6) foreach UN bt
7) log
8) net -a
9) dev -d
10) kmem -s