[Bug testsuite/13193] Running bz6503.exp results in unresponsive/crashed machine

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

http://sourceware.org/bugzilla/show_bug.cgi?id=13193

--- Comment #2 from Mark Wielaard <mjw at redhat dot com> 2011-09-23 11:52:17 UTC ---
There was a workaround committed which looked like it was perfect:

commit 01cfbeb43559e5a93eda648fc81d4aa102e6cb13
Author: Frank Ch. Eigler <fche@redhat.com>
Date:   Fri Sep 16 17:34:14 2011 -0400

    PR13193 wallpaper

    The reported stuck process bug (whether it's in the kernel or
    in stap), is apparently triggered by concurrent modprobes.  Change
    the testsuite to avoid this practice, to wallpaper over the problem
    temporarily.

Unfortunately I just got another issue with this testcase, this time on i386
f15:

[157004.483057] stap_6ab51e385550b0fd6d843037b0d7d38c_9609: systemtap:
1.7/0.148.90, base: f8aca000, memory: 34data/20text/2ctx/10net/16alloc kb,
probes: 2
[157008.989239] stap_a40026234a1787c83a1dafb3aae558ca__9841: systemtap:
1.7/0.148.90, base: f8b24000, memory: 61data/24text/15ctx/10net/163alloc kb,
probes: 10
[157013.346702] stap_190d377c71fa6a45f476ce480c4912a1_10067: systemtap:
1.7/0.148.90, base: f8ad9000, memory: 51data/24text/15ctx/10net/163alloc kb,
probes: 6
[157018.205175] stap_1aa19d6453909e68c4758c58d1d67725_10296: systemtap:
1.7/0.148.90, base: f8b61000, memory: 143data/15text/0ctx/10net/64alloc kb,
probes: 396
[157018.227386] Warning: found a stray unused aggrprobe@f8942011
[157018.227398] ------------[ cut here ]------------
[157018.227453] kernel BUG at kernel/kprobes.c:707!
[157018.227498] invalid opcode: 0000 [#1] SMP 
[157018.227543] Modules linked in: jffs2(+)
stap_1aa19d6453909e68c4758c58d1d67725_10296 uprobes nf_conntrack_ipv6
nf_defrag_ipv6 ip6table_filter ip6_tables nf_conntrack_ipv4 nf_defrag_ipv4
xt_state nf_conntrack stap_e9739cce4a6f43356403eefe748313cc_565
stap_06d4707db0c0eb2d86b639a84f948296_9487
stap_e0d0211e1b7bbf8f7df399c1665c8493_565 mtd zlib_deflate tcp_lp tun fuse
ebtable_nat ebtables xt_CHECKSUM bridge stp llc ppdev parport_pc lp parport
sunrpc cpufreq_ondemand acpi_cpufreq mperf bnep bluetooth xt_physdev
ip6t_REJECT snd_hda_codec_analog snd_hda_intel snd_hda_codec snd_hwdep snd_seq
snd_seq_device iTCO_wdt snd_pcm arc4 iwl3945 snd_timer iwl_legacy mac80211
iTCO_vendor_support thinkpad_acpi snd soundcore cfg80211 e1000e i2c_i801 joydev
microcode snd_page_alloc rfkill virtio_net kvm_intel kvm uinput ipv6 xts
gf128mul dm_crypt yenta_socket i915 drm_kms_helper drm i2c_algo_bit i2c_core
video [last unloaded: stap_190d377c71fa6a45f476ce480c4912a1_10067]
[157018.228133] 
[157018.228133] Pid: 10302, comm: modprobe Not tainted 2.6.40.4-5.fc15.i686 #1
LENOVO 195144G/195144G
[157018.228133] EIP: 0060:[<c07ee524>] EFLAGS: 00010246 CPU: 0
[157018.228133] EIP is at register_kprobe+0x1ca/0x3a5
[157018.228133] EAX: 00000047 EBX: f8b827fc ECX: 00000046 EDX: 00000000
[157018.228133] ESI: e9856420 EDI: 00000000 EBP: d1693eb0 ESP: d1693e90
[157018.228133]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
[157018.228133] Process modprobe (pid: 10302, ti=d1692000 task=dba09940
task.ti=d1692000)
[157018.228133] Stack:
[157018.228133]  c0939f72 f8942011 f8b6f1fe f8b82804 f8bfa5c4 f8b827fc f8b6f1f0
00002100
[157018.228133]  d1693ed4 f8b6370e f6173a40 00000246 d1693ee4 000000c0 f8b6d0e4
00000000
[157018.228133]  00000001 d1693ef0 c07ed017 f8bfa5c4 c0a3b7ec c0a398c0 ffffffff
00000460
[157018.228133] Call Trace:
[157018.228133]  [<f8942011>] ? jffs2_compressors_init+0x11/0x11 [jffs2]
[157018.228133]  [<f8b6370e>] _stp_module_notifier+0x1a0/0x26e
[stap_1aa19d6453909e68c4758c58d1d67725_10296]
[157018.228133]  [<c07ed017>] notifier_call_chain+0x2b/0x4d
[157018.228133]  [<c04582e6>] __blocking_notifier_call_chain+0x40/0x52
[157018.228133]  [<c0458317>] blocking_notifier_call_chain+0x1f/0x21
[157018.228133]  [<c0469ea0>] sys_init_module+0x1384/0x15af
[157018.228133]  [<c07e9f54>] syscall_call+0x7/0xb
[157018.228133] Code: 39 46 40 75 13 8b 46 14 c7 04 24 72 9f 93 c0 89 44 24 04
e8 08 41 ff ff 83 66 3c fd 81 7e 20 9c d1 7e c0 75 06 83 7e 50 00 75 02 <0f> 0b
89 f0 e8 1c f5 ff ff f6 46 3c 01 74 22 89 f0 e8 e6 da ff 
[157018.228133] EIP: [<c07ee524>] register_kprobe+0x1ca/0x3a5 SS:ESP
0068:d1693e90
[157018.293049] ---[ end trace f0f649cc63eb195a ]---

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