[Bug runtime/21726] New: on rawhide, the backtrace.exp test case causes a kernel panic

["dsmith at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=21726

            Bug ID: 21726
           Summary: on rawhide, the backtrace.exp test case causes a
                    kernel panic
           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 (4.12.0-0.rc7.git2.1.fc27.x86_64), I'm seeing the following kernel
panic when running the backtrace.exp test case:

====
[  388.153533] BUG: unable to handle kernel paging request at ffffffffc043307e
[  388.154243] IP: report_bug+0x94/0x120
[  388.154607] PGD 66e14067 
[  388.154608] P4D 66e14067 
[  388.154866] PUD 66e16067 
[  388.155123] PMD 13425d067 
[  388.155380] PTE 800000010a0c9161
[  388.155654] 
[  388.156144] Oops: 0003 [#1] SMP
[  388.156452] Modules linked in:
stap_e826df493357d85b1964bab4f742b8d4_2337(OE) sunrpc ppdev crct10dif_pclmul
crc32_pclmul ghash_clmulni_intel joydev virtio_net virtio_balloon tpm_tis
parport_pc i2c_piix4 tpm_tis_core parport tpm pvpanic xfs libcrc32c
virtio_console virtio_blk crc32c_intel serio_raw virtio_pci virtio_ring
ata_generic virtio pata_acpi
[  388.159371] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G           OE  
4.12.0-0.rc7.git2.1.fc27.x86_64 #1
[  388.160225] Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011
[  388.160783] task: ffffffff89e18500 task.stack: ffffffff89e00000
[  388.161351] RIP: 0010:report_bug+0x94/0x120
[  388.161761] RSP: 0018:ffff88c6ffc03c00 EFLAGS: 00010002
[  388.162275] RAX: 0000000000000907 RBX: ffff88c6ffc03d68 RCX:
ffffffffc0433074
[  388.162954] RDX: 0000000000000001 RSI: 0000000000000047 RDI:
0000000000000001
[  388.163628] RBP: ffff88c6ffc03c20 R08: 0000006ed270b039 R09:
22bcc9f200000000
[  388.164301] R10: 0000000000000001 R11: 0000000000000000 R12:
ffffffffc042bc79
[  388.164986] R13: ffffffffc0432888 R14: 0000000000000004 R15:
ffff88c6ffc03d68
[  388.165676] FS:  0000000000000000(0000) GS:ffff88c6ffc00000(0000)
knlGS:0000000000000000
[  388.166448] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  388.166995] CR2: ffffffffc043307e CR3: 00000001382bc000 CR4:
00000000001406f0
[  388.167679] Call Trace:
[  388.167922]  <IRQ>
[  388.168131]  ? _stp_stack_kernel_get.part.39+0x3f9/0x410
[stap_e826df493357d85b1964bab4f742b8d4_2337]
[  388.169023]  fixup_bug+0x2e/0x50
[  388.169339]  do_trap+0x119/0x150
[  388.169657]  do_error_trap+0xa3/0x160
[  388.170023]  ? _stp_stack_kernel_get.part.39+0x3f9/0x410
[stap_e826df493357d85b1964bab4f742b8d4_2337]
[  388.170912]  ? unwind_frame.constprop.59+0x8c1/0x11b0
[stap_e826df493357d85b1964bab4f742b8d4_2337]
[  388.171766]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[  388.172217]  do_invalid_op+0x20/0x30
[  388.172580]  invalid_op+0x1e/0x30
[  388.172904] RIP: 0010:_stp_stack_kernel_get.part.39+0x3f9/0x410
[stap_e826df493357d85b1964bab4f742b8d4_2337]
[  388.173853] RSP: 0018:ffff88c6ffc03e10 EFLAGS: 00010006
[  388.174360] RAX: 0000000080010002 RBX: ffffffff89e18500 RCX:
ffffffffffffffff
[  388.175041] RDX: ffffffffc042cda6 RSI: 00007ffffffff000 RDI:
ffff88c6ffc03e70
[  388.175731] RBP: ffff88c6ffc03e68 R08: 0000000000000007 R09:
0000000000000008
[  388.176416] R10: ffff88c6ffc03e08 R11: 0000000000000047 R12:
0000000000000000
[  388.177098] R13: ffffa42380ad5a40 R14: 0000000000000001 R15:
ffffa42380ad5000
[  388.177780]  ? function___global_print_backtrace__overload_0+0xb6/0x1a0
[stap_e826df493357d85b1964bab4f742b8d4_2337]
[  388.178780]  function___global_print_backtrace__overload_0+0xb6/0x1a0
[stap_e826df493357d85b1964bab4f742b8d4_2337]
[  388.179781]  probe_3649+0xd9/0x150
[stap_e826df493357d85b1964bab4f742b8d4_2337]
[  388.180486]  _stp_hrtimer_notify_function+0x284/0x490
[stap_e826df493357d85b1964bab4f742b8d4_2337]
[  388.181336]  ? _stp_proc_read_file+0x430/0x430
[stap_e826df493357d85b1964bab4f742b8d4_2337]
[  388.182142]  __hrtimer_run_queues+0xf0/0x4e0
[  388.182560]  hrtimer_interrupt+0xb6/0x210
[  388.182955]  local_apic_timer_interrupt+0x38/0x60
[  388.183405]  smp_apic_timer_interrupt+0x38/0x50
[  388.183846]  apic_timer_interrupt+0x9d/0xb0
[  388.184250] RIP: 0010:native_safe_halt+0x6/0x10
[  388.184690] RSP: 0018:ffffffff89e03dd8 EFLAGS: 00000206 ORIG_RAX:
ffffffffffffff10
[  388.185420] RAX: ffffffff89e18500 RBX: ffffffff89e18500 RCX:
0000000000000000
[  388.186110] RDX: ffffffff89e18500 RSI: 0000000000000001 RDI:
ffffffff89e18500
[  388.186795] RBP: ffffffff89e03dd8 R08: 0000000000000001 R09:
0000000000000000
[  388.187480] R10: 0000000000000000 R11: 0000000000000000 R12:
0000000000000000
[  388.188168] R13: ffffffff89e18500 R14: 0000000000000000 R15:
0000000000000000
[  388.188852]  </IRQ>
[  388.189072]  ? trace_hardirqs_on+0xd/0x10
[  388.189463]  default_idle+0x25/0x1b0
[  388.189814]  arch_cpu_idle+0xf/0x20
[  388.190153]  default_idle_call+0x23/0x40
[  388.190536]  do_idle+0x175/0x1f0
[  388.190857]  cpu_startup_entry+0x71/0x80
[  388.191236]  rest_init+0x135/0x140
[  388.191585]  start_kernel+0x47f/0x4a0
[  388.191944]  ? early_idt_handler_array+0x120/0x120
[  388.192401]  x86_64_start_reservations+0x29/0x2b
[  388.192846]  x86_64_start_kernel+0x143/0x166
[  388.193256]  secondary_startup_64+0x9f/0x9f
[  388.193666] Code: 74 59 0f b7 41 0a 4c 63 69 04 0f b7 71 08 89 c7 49 01 cd
83 e7 01 a8 02 74 15 66 85 ff 74 10 a8 04 ba 01 00 00 00 75 26 83 c8 04 <66> 89
41 0a 66 85 ff 74 49 0f b6 49 0b 4c 89 e2 45 31 c9 49 89 
[  388.195491] RIP: report_bug+0x94/0x120 RSP: ffff88c6ffc03c00
[  388.196028] CR2: ffffffffc043307e
[  388.196363] ---[ end trace 4a1ee64c6d807fc5 ]---
[  388.196809] Kernel panic - not syncing: Fatal exception in interrupt
[  388.198342] stap_e826df493357d85b1964bab4f742b8d4_2337 trace buffer for
processor 0 sub-buffer 0:
[  388.199221] The following may not have been sent to the display:
[  388.199805] begin
[  388.200001]  0xffffffffc042bb4d
[stap_e826df493357d85b1964bab4f742b8d4_2337+0x8b4d/0x0]
[  388.200759]  0xffffffffc042cda6
[stap_e826df493357d85b1964bab4f742b8d4_2337+0x9da6/0x0]
[  388.201525]  0xffffffffc042d278
[stap_e826df493357d85b1964bab4f742b8d4_2337+0xa278/0x0]
[  388.202284]  0xffffffffc042e056
[stap_e826df493357d85b1964bab4f742b8d4_2337+0xb056/0x0]
[  388.203054]  0xffffffffc042f0b5
[stap_e826df493357d85b1964bab4f742b8d4_2337+0xc0b5/0x0]
[  388.203822]  0xffffffff893e3998
[  388.204125]  0x0 (inexact)
[  388.204401] Kernel Offset: 0x8000000 from 0xffffffff81000000 (relocation
range: 0xffffffff80000000-0xffffffffbfffffff)
[  388.205428] ---[ end Kernel panic - not syncing: Fatal exception in
interrupt
====

This crash is consistent. I've seen it on real hardware and on a rawhide VM.

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