[Bug testsuite/23493] Test suite makes all CPU stuck forever on kernel 4.16.16 (Fedora 27)

["agentzh at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=23493

--- Comment #8 from agentzh <agentzh at gmail dot com> ---
Got another VM lockup today and found the following output in the serial port
console:

```
Fedora 27 (Server Edition)
Kernel 4.16.16-200.fc27.x86_64 on an x86_64 (ttyS1)

Admin Console: …

work2 login: [199810.093706] BUG: unable to handle kernel NULL pointer
dereference at 0000000000000018
[199810.098304] IP: idr_find+0x0/0x10
[199810.099452] PGD 0 P4D 0
[199810.100545] Oops: 0000 [#1] SMP PTI
[199810.101868] Modules linked in:
stap_90d3fbe18ef964786450622403aff75f_53232(OE)
stap_cb1c82c1a520c7e28bc23ff0583b723_26015(OE)
stap_5546859fb0fb1fe0358665f08f8539_102168(OE)
stap_1699a9c06989cded3b2bfdebd62fd6e9_7693(OE) s_97966(OE) tun binfmt_misc
ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 xt_conntrack ip_set nfnetlink
ebtable_nat ebtable_broute bridge stp llc ip6table_nat nf_conntrack_ipv6
nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_raw ip6table_security
iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 fuse nf_nat_ipv4 nf_nat
nf_conntrack iptable_mangle iptable_raw iptable_security ebtable_filter
ebtables ip6table_filter ip6_tables vmw_vsock_vmci_transport vsock sunrpc
snd_seq_midi snd_seq_midi_event snd_ens1371 coretemp crct10dif_pclmul
snd_ac97_codec ac97_bus btusb gameport crc32_pclmul btrtl
[199810.124418]  snd_rawmidi btbcm ghash_clmulni_intel snd_seq btintel
snd_seq_device bluetooth snd_pcm snd_timer snd ecdh_generic rfkill soundcore
intel_rapl_perf joydev vmw_balloon i2c_piix4 vmw_vmci shpchp xfs libcrc32c
vmwgfx drm_kms_helper ttm crc32c_intel drm mptspi serio_raw scsi_transport_spi
mptscsih e1000 mptbase ata_generic pata_acpi [last unloaded:
stap_c0bb131f68fd6d96fe20bf726877cbfd_51549]
[199810.135177] CPU: 2 PID: 53244 Comm: cat Tainted: G           OE   
4.16.16-200.fc27.x86_64 #1
[199810.137821] Hardware name: VMware, Inc. VMware Virtual Platform/440BX
Desktop Reference Platform, BIOS 6.00 07/02/2015
[199810.141336] RIP: 0010:idr_find+0x0/0x10
[199810.142583] RSP: 0018:ffffbeddc3423d40 EFLAGS: 00010046
[199810.144310] RAX: 0000000000000000 RBX: ffffbeddc2191000 RCX:
00000000ffffffff
[199810.146450] RDX: 0000000000000000 RSI: 000000000000cffc RDI:
0000000000000008
[199810.148760] RBP: ffffbeddc21918a8 R08: 0000000000002710 R09:
ffff9e8127a01f00
[199810.150956] R10: 0000000000002710 R11: 0000000000000000 R12:
0000000000000001
[199810.153205] R13: 0000000000000000 R14: 0000000000000000 R15:
00000000ffffffff
[199810.155436] FS:  0000000000000000(0000) GS:ffff9e825fa80000(0000)
knlGS:0000000000000000
[199810.157981] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[199810.212544] CR2: 0000000000000018 CR3: 000000024120a001 CR4:
00000000001606e0
[199810.215011] DR0: ffffffff8427ff88 DR1: 0000000000000000 DR2:
0000000000000000
[199810.217433] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
0000000000000600
[199810.219853] Call Trace:
[199810.233902]  find_get_pid+0x38/0x50
[199810.235436]  function___global_pid2task__overload_0+0x7a/0x180
[stap_90d3fbe18ef964786450622403aff75f_53232]
[199810.239019]  ? probe_4960+0xad6/0x1760
[stap_90d3fbe18ef964786450622403aff75f_53232]
[199810.241607]  ? enter_real_tracepoint_probe_0+0x198/0x2d0
[stap_90d3fbe18ef964786450622403aff75f_53232]
[199810.245162]  ? __schedule+0x2d3/0x860
[199810.246718]  ? do_task_dead+0x3f/0x50
[199810.248254]  ? do_exit+0x73b/0xbb0
[199810.249684]  ? do_group_exit+0x3a/0xa0
[199810.251200]  ? SyS_exit_group+0x10/0x10
[199810.252711]  ? do_syscall_64+0x74/0x180
[199810.254238]  ? entry_SYSCALL_64_after_hwframe+0x3d/0xa2
[199810.256126] Code: e7 44 89 6c 24 04 e8 00 fe ff ff eb af e8 09 b9 80 ff 66
0f 1f 84 00 00 00 00 00 8b 47 10 31 d2 48 29 c6 e9 c3 55 00 00 0f 1f 00 <8b> 47
10 48 29 c6 e9 a5 55 00 00 0f 1f 44 00 00 55 53 48 89 f5
[199810.262366] RIP: idr_find+0x0/0x10 RSP: ffffbeddc3423d40
[199810.264261] CR2: 0000000000000018
[199810.265642] ---[ end trace 4e992f315e802219 ]---
[199810.267325] Fixing recursive fault but reboot is needed!
```

Is it a bug in the stap runtime or in the kernel?

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