RHEL7 crashes when the filesystem gets unmouted and the uprobe is being released after the umount

Issue

• Kernel crash with the following call trace (during umount or reboot):

PANIC: "BUG: unable to handle kernel NULL pointer dereference at 0000000000000058"

PID: 1234     TASK: ffff9360df3eb180  CPU: 4    COMMAND: "task"
 #0 [ffff936047f37930] machine_kexec at ffffffffab8662f4
 #1 [ffff936047f37990] __crash_kexec at ffffffffab922a32
 #2 [ffff936047f37a60] crash_kexec at ffffffffab922b20
 #3 [ffff936047f37a78] oops_end at ffffffffabf91798
 #4 [ffff936047f37aa0] no_context at ffffffffab875d14
 #5 [ffff936047f37af0] __bad_area_nosemaphore at ffffffffab875fe2
 #6 [ffff936047f37b40] bad_area_nosemaphore at ffffffffab876104
 #7 [ffff936047f37b50] __do_page_fault at ffffffffabf94750
 #8 [ffff936047f37bc0] trace_do_page_fault at ffffffffabf94a26
 #9 [ffff936047f37c00] do_async_page_fault at ffffffffabf93fa2
#10 [ffff936047f37c20] async_page_fault at ffffffffabf907a8
    [exception RIP: _raw_spin_lock+0xc]
    RIP: ffffffffabf8ecfc  RSP: ffff936047f37cd8  RFLAGS: 00010246
    RAX: 0000000000000000  RBX: ffff9359ecf11210  RCX: 0000000000000034
    RDX: 0000000000000001  RSI: ffff9359f0135868  RDI: 0000000000000058
    RBP: ffff936047f37cf8   R8: d018000000000000   R9: 59f01358680c0000
    R10: 0000000000000000  R11: 0000000000000002  R12: ffff9359ecf11208
    R13: 0000000000000058  R14: ffffffffc042e3e0  R15: ffff9360854c5228
    ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
#11 [ffff936047f37cd8] selinux_inode_free_security at ffffffffabb0ef2e
#12 [ffff936047f37d00] security_inode_free at ffffffffabb08d08
#13 [ffff936047f37d18] __destroy_inode at ffffffffaba6c752
#14 [ffff936047f37d30] destroy_inode at ffffffffaba6c842
#15 [ffff936047f37d48] evict at ffffffffaba6c995
#16 [ffff936047f37d70] iput at ffffffffaba6cd6c
#17 [ffff936047f37da0] free_trace_uprobe at ffffffffab98d48b
#18 [ffff936047f37dc0] destroy_local_trace_uprobe at ffffffffab98f1f2
#19 [ffff936047f37de0] perf_uprobe_destroy at ffffffffab983754
#20 [ffff936047f37df8] _free_event at ffffffffab9af49a
#21 [ffff936047f37e18] put_event at ffffffffab9af6f9
#22 [ffff936047f37e28] perf_event_release_kernel at ffffffffab9af923
#23 [ffff936047f37e88] perf_release at ffffffffab9afa10
#24 [ffff936047f37e98] __fput at ffffffffaba5088c
#25 [ffff936047f37ee0] ____fput at ffffffffaba50abe
#26 [ffff936047f37ef0] task_work_run at ffffffffab8c299b
#27 [ffff936047f37f30] do_notify_resume at ffffffffab82cc65
#28 [ffff936047f37f50] int_signal at ffffffffabf9a2ef
    RIP: 00007f5c6f53938e  RSP: 000000c000685d18  RFLAGS: 00000202
    RAX: 0000000000000000  RBX: 0000000000000039  RCX: ffffffffffffffff
    RDX: 0000000000000000  RSI: 0000000000000000  RDI: 0000000000000039
    RBP: 000000c000685d58   R8: 0000000000000000   R9: 0000000000000000
    R10: 0000000000000000  R11: 0000000000000202  R12: 000000c000685da8
    R13: 0000000000000010  R14: 000000c0000d9880  R15: 000000c0005e0a90
    ORIG_RAX: 0000000000000003  CS: 0033  SS: 002b

• Prior to crash we can see VFS error:

VFS: Busy inodes after unmount of dm-N. Self-destruct in 5 seconds.  Have a nice day...