[Bug kprobes/22147] New: stopped to probe do_arch_ctrl_64

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

https://sourceware.org/bugzilla/show_bug.cgi?id=22147

            Bug ID: 22147
           Summary: stopped to probe do_arch_ctrl_64
           Product: systemtap
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: kprobes
          Assignee: systemtap at sourceware dot org
          Reporter: nlzdbg at gmail dot com
  Target Milestone: ---

fedora core 26 x64
kernel version either 4.12.9 or 4.12.12 x64.
gcc-7.1.1-3.fc26.x86_64
systemtap-3.1-5.fc26.x86_64

tap script 
nvidia.debug.stp

global cnt_fs_base_set

probe begin 
{
 print ("start systemtap for Xorg nvidia fs_base change debugging version\n")
 printf( "pid=%d, target=%d\n",pid(),target())
}

probe end {
 print ( "cnt_fs_base_set=%d\n", cnt_fs_base_set )
 print ( "end systemtap\n")

}

function my_get_fs_base:long () %{
unsigned int low,high;
__asm__ volatile (
  "movq $0xc0000100, %%rcx\n\t"
  "rdmsr\n\t" 
  :"=a"(low),"=d"(high)::"rcx"
);
STAP_RETURN( (unsigned long long) high<<32 | low ); 
%}


probe kernel.function("do_arch_prctl_64").call 
{
 if ( pid() == target() ) {
    if ( ulonglong_arg(2) ==  0x1002 ) {
      ++cnt_fs_base_set
      printf ("do_arch_prctl_64 ARCH_SET_FS fun %s option %x arg %x\n",
ppfunc(), ulonglong_arg(2), ulonglong_arg(3) )
      printf( " tid %d current fs base %x \n", tid(), my_get_fs_base() )

    }
 }
}

some times it did probe but it stopped to do it.
It is not clear  what is changed.
I did kernel and systemtap upgrade.
But return to previous 4.12.9 where I had it working
but behavour the same as for 4.12.12

dmesg

[17032.940742] NMI watchdog: BUG: soft lockup - CPU#7 stuck for 23s!
[stapio:10314]
[17032.940744] Modules linked in: stap_nvidiadbg(OE) overlay razerkbd(OE)
vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) rfcomm fuse ccm
xt_CHECKSUM ipt_MASQUERADE nf_nat_masquerade_ipv4 tun nf_conntrack_netbios_ns
nf_conntrack_broadcast xt_CT 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
nf_nat_ipv4 nf_nat nf_conntrack libcrc32c iptable_mangle iptable_raw
iptable_security ebtable_filter ebtables ip6table_filter ip6_tables bnep sunrpc
vfat fat arc4 intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp
iTCO_wdt iTCO_vendor_support kvm_intel iwlmvm kvm mac80211 snd_hda_codec_hdmi
[17032.940766]  nvidia_drm(POE) irqbypass nvidia_modeset(POE) crct10dif_pclmul
crc32_pclmul ghash_clmulni_intel nvidia(POE) snd_hda_codec_realtek
snd_hda_codec_generic intel_cstate intel_uncore iwlwifi intel_rapl_perf
snd_hda_intel cfg80211 snd_hda_codec raid0 snd_hda_core snd_hwdep snd_seq
snd_seq_device joydev snd_pcm hci_uart razermouse(OE) btusb snd_timer btrtl
btbcm snd btqca btintel mei_me bluetooth soundcore i2c_i801 mei shpchp
ecdh_generic rfkill pinctrl_sunrisepoint intel_lpss_acpi pinctrl_intel
intel_lpss acpi_als tpm_tis kfifo_buf tpm_tis_core industrialio tpm acpi_pad
binfmt_misc i915 crc32c_intel e1000e ptp nvme pps_core nvme_core i2c_algo_bit
drm_kms_helper drm wmi video i2c_hid nct6775 hwmon_vid
[17032.940790] CPU: 7 PID: 10314 Comm: stapio Tainted: P           OE  
4.12.9-300.fc26.x86_64 #1
[17032.940790] Hardware name: To Be Filled By O.E.M. To Be Filled By
O.E.M./Z270 Gaming-ITX/ac, BIOS P2.30 07/14/2017
[17032.940791] task: ffff8faa605c4c80 task.stack: ffffa2eec8948000
[17032.940805] RIP: 0010:strchr+0xc/0x30
[17032.940806] RSP: 0018:ffffa2eec894bc30 EFLAGS: 00000202 ORIG_RAX:
ffffffffffffff10
[17032.940807] RAX: 000000000000006e RBX: ffffffffc1f63460 RCX:
ffffffffc0d4fe90
[17032.940807] RDX: 000000000000003a RSI: 000000000000003a RDI:
ffffffffc1a52d69
[17032.940808] RBP: ffffa2eec894bc30 R08: 0000000000000075 R09:
ffffffffc1a52d69
[17032.940808] R10: ffffffff99c5f690 R11: ffffffff99c5fa20 R12:
ffffffffc12d3840
[17032.940809] R13: 0000000000151380 R14: 0000000000003d50 R15:
ffffa2eec894bda8
[17032.940809] FS:  00007f534c68a700(0000) GS:ffff8fab4edc0000(0000)
knlGS:0000000000000000
[17032.940810] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[17032.940810] CR2: 00007f534409aff8 CR3: 000000076a233000 CR4:
00000000003406e0
[17032.940811] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[17032.940811] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
0000000000000400
[17032.940812] Call Trace:
[17032.940816]  stapkp_symbol_callback+0xa0/0x120 [stap_nvidiadbg]
[17032.940937]  ? _nv003965rm+0x30/0x30 [nvidia]
[17032.940940]  ? __stp_relay_wakeup_timer+0x90/0x90 [stap_nvidiadbg]
[17032.940941]  module_kallsyms_on_each_symbol+0x73/0xb0
[17032.940943]  ? __stp_relay_wakeup_timer+0x90/0x90 [stap_nvidiadbg]
[17032.940944]  kallsyms_on_each_symbol+0xb9/0xc0
[17032.940945]  ? probe_12123+0x3f/0x290 [stap_nvidiadbg]
[17032.940947]  _stp_ctl_write_cmd+0xa3e/0xcb0 [stap_nvidiadbg]
[17032.940949]  full_proxy_write+0x54/0x90
[17032.940951]  __vfs_write+0x37/0x160
[17032.940952]  ? selinux_file_permission+0xfb/0x120
[17032.940954]  ? security_file_permission+0x3b/0xc0
[17032.940955]  vfs_write+0xb1/0x1a0
[17032.940956]  SyS_write+0x55/0xc0
[17032.940959]  entry_SYSCALL_64_fastpath+0x1a/0xa5
[17032.940959] RIP: 0033:0x7f534c28522d
[17032.940960] RSP: 002b:00007fff4cd4cad0 EFLAGS: 00000293 ORIG_RAX:
0000000000000001
[17032.940961] RAX: ffffffffffffffda RBX: 00007f534409b700 RCX:
00007f534c28522d
[17032.940961] RDX: 000000000000000c RSI: 00007fff4cd4cae0 RDI:
0000000000000004
[17032.940962] RBP: 00007fff4cd4bd90 R08: 0000000000000000 R09:
00007f534409b700
[17032.940962] R10: 00007f534409b9d0 R11: 0000000000000293 R12:
0000000000000000
[17032.940962] R13: 00007fff4cd4bd20 R14: 00007f534409b9c0 R15:
0000000000000000
[17032.940963] Code: 01 84 c9 74 05 48 39 d0 75 e5 31 c0 5d c3 44 38 c1 19 c0
83 c8 01 5d c3 0f 1f 80 00 00 00 00 0f b6 07 55 48 89 e5 40 38 f0 74 17 <84> c0
89 f2 75 06 eb 14 84 c0 74 10 48 83 c7 01 0f b6 07 38 d0 


Any clue what is wrong with systemstap?
Is it systemtap problem or problem of linux kernel?

Why pass 2 run ~25 minutes? Is it expected so long time.

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