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[Bug runtime/22222] New: on rawhide, we're getting a "spinlock bad magic" BUG

https://sourceware.org/bugzilla/show_bug.cgi?id=22222

            Bug ID: 22222
           Summary: on rawhide, we're getting a "spinlock bad magic" BUG
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
          Assignee: systemtap at sourceware dot org
          Reporter: dsmith at redhat dot com
  Target Milestone: ---

On rawhide (4.14.0-0.rc0.git6.1.fc28.x86_64+debug), I'm seeing the following
when running the pr16806.exp test case. This doesn't happen 100% of the time,
but quite regularly.

====
[ 1327.349418] BUG: spinlock bad magic on CPU#0, loop/29093
[ 1327.356135]  lock: 0xffff96da94cc73e8, .magic: a76dfaba, .owner: <none>/-1,
.owner_cpu: -1
[ 1327.356938] CPU: 0 PID: 29093 Comm: loop Tainted: G           OE  
4.14.0-0.rc0.git6.1.fc28.x86_64+debug #1
[ 1327.357849] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011
[ 1327.358393] Call Trace:
[ 1327.358637]  dump_stack+0x8e/0xd6
[ 1327.358964]  spin_dump+0x78/0xd0
[ 1327.359276]  do_raw_spin_lock+0x72/0xc0
[ 1327.359651]  _raw_spin_lock+0x55/0x70
[ 1327.360024]  utrace_resume+0x17e/0x3e0 [modloop]
[ 1327.360468]  task_work_run+0x8b/0xc0
[ 1327.360815]  exit_to_usermode_loop+0xb5/0xc0
[ 1327.361293]  ? do_syscall_64+0x6c/0x1e0
[ 1327.361663]  syscall_return_slowpath+0x12a/0x130
[ 1327.362112]  ret_from_fork+0x15/0x40
[ 1327.362457] RIP: 0033:0x7f4248ee35e1
[ 1327.362800] RSP: 002b:00007f4248dedfb0 EFLAGS: 00000202 ORIG_RAX:
0000000000000038
[ 1327.363519] RAX: 0000000000000000 RBX: 00007f4248dee700 RCX:
00007f4248ee35e1
[ 1327.364197] RDX: 00007f4248dee9d0 RSI: 00007f4248dedfb0 RDI:
00000000003d0f00
[ 1327.364866] RBP: 00007ffe4a3e7bd0 R08: 00007f4248dee700 R09:
00007f4248dee700
[ 1327.365588] R10: 00007f4248dee9d0 R11: 0000000000000202 R12:
00007ffe4a3e7b4e
[ 1327.366305] R13: 00007ffe4a3e7b4f R14: 00007f4248dee700 R15:
000000000000000f
====

This "spinlock bad magic" BUG means that we're trying to use something as a
spinlock that isn't a spinlock.

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