System crashed in kmem_cache_alloc() which was called from 'fileop_new()'

Issue

• System was crashed with the below call trace.

crash> bt
PID: 1418   TASK: ffff88032ef48000  CPU: 7   COMMAND: "in:imjournal"
 #0 [ffff880317e13b50] machine_kexec at ffffffff81059cdb
 #1 [ffff880317e13bb0] __crash_kexec at ffffffff81105182
 #2 [ffff880317e13c80] crash_kexec at ffffffff81105270
 #3 [ffff880317e13c98] oops_end at ffffffff8168ed88
 #4 [ffff880317e13cc0] no_context at ffffffff8167e993
 #5 [ffff880317e13d10] __bad_area_nosemaphore at ffffffff8167ea29
 #6 [ffff880317e13d58] bad_area at ffffffff8167ed4d
 #7 [ffff880317e13d80] __do_page_fault at ffffffff81691c1f
 #8 [ffff880317e13de0] do_page_fault at ffffffff81691cc5
 #9 [ffff880317e13e10] page_fault at ffffffff8168df88
    [exception RIP: kmem_cache_alloc+0x41]
    RIP: ffffffff811ddf81  RSP: ffff880317e13ec8  RFLAGS: 00010046
    RAX: 0000000000000020  RBX: 0000000000000150  RCX: 0000000000000000
    RDX: 000000000000002f  RSI: 0000000000000020  RDI: 0000000000000000
    RBP: ffff880317e13ef8   R8: 0000000000000000   R9: ffffffffa02306b6
    R10: ffff88032ef48000  R11: ffffffff8168f8f9  R12: 00007ff4540009c0
    R13: 0000000000000020  R14: 0000000000000000  R15: 0000000000000000
    ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
#10 [ffff880317e13f00] fileop_new at ffffffffa02306b6 [ampfsm]
#11 [ffff880317e13f30] _op_pre_process at ffffffffa023129e [ampfsm]
#12 [ffff880317e13f70] _rename_handler at ffffffffa02312f8 [ampfsm]
    RIP: 00007ff465ae9887  RSP: 00007ff462942a08  RFLAGS: 00000206
    RAX: ffffffffffffffda  RBX: ffffffff8168f8f9  RCX: ffffffffffffffff
    RDX: 00007ff454000078  RSI: 00007ff4540009c0  RDI: 00007ff462942a20
    RBP: 00007ff462942a20   R8: 0000000000000001   R9: 00007ff462943700
    R10: 0000000000000080  R11: 0000000000000206  R12: ffffffffa02312f8
    R13: ffff880317e13f78  R14: 000000000000000a  R15: 00007ff454069e90
    ORIG_RAX: 0000000000000052  CS: 0033  SS: 002b