[Bug runtime/14221] New: timer.profile probes cause kernel warning

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

http://sourceware.org/bugzilla/show_bug.cgi?id=14221

             Bug #: 14221
           Summary: timer.profile probes cause kernel warning
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
        AssignedTo: systemtap@sourceware.org
        ReportedBy: dsmith@redhat.com
    Classification: Unclassified


Created attachment 6445
  --> http://sourceware.org/bugzilla/attachment.cgi?id=6445
test script

On rawhide (3.5.0-0.rc1.git0.1.fc18.x86_64), Having more than 1 timer.profile
probe in a script causes the following kernel warning:

====
Jun 11 11:03:43 kvm-rawhide-64-2 kernel: [321766.484074] ------------[ cut here
]------------
Jun 11 11:03:43 kvm-rawhide-64-2 kernel: [321766.484095] WARNING: at
kernel/profile.c:221 unregister_timer_hook+0x35/0x40()
Jun 11 11:03:43 kvm-rawhide-64-2 kernel: [321766.484099] Hardware name: Bochs
Jun 11 11:03:43 kvm-rawhide-64-2 kernel: [321766.484216] Modules linked in:
stap_f48cdaa4743be429f3c1898705b9bcb7_4500(O)(U) nfs nfs_acl auth_rpcgss
fscache lockd sunrpc ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6
nf_conntrack_ipv4 ip6table_filter nf_defrag_ipv4 xt_state nf_conntrack
ip6_tables snd_hda_intel kvm_amd kvm snd_hda_codec snd_hwdep snd_pcm
snd_page_alloc snd_timer snd hid_generic virtio_net i2c_piix4 soundcore
virtio_balloon uinput virtio_blk cirrus drm_kms_helper ttm drm i2c_core [last
unloaded: stap_de7534c3751ff1e20989bf2269657d17_4322]
Jun 11 11:03:43 kvm-rawhide-64-2 kernel: [321766.484225] Pid: 4500, comm:
stapio Tainted: G        W  O 3.5.0-0.rc1.git0.1.fc18.x86_64 #1
Jun 11 11:03:43 kvm-rawhide-64-2 kernel: [321766.484229] Call Trace:
Jun 11 11:03:43 kvm-rawhide-64-2 kernel: [321766.484241]  [<ffffffff8105817f>]
warn_slowpath_common+0x7f/0xc0
Jun 11 11:03:43 kvm-rawhide-64-2 kernel: [321766.484248]  [<ffffffff810581da>]
warn_slowpath_null+0x1a/0x20
Jun 11 11:03:43 kvm-rawhide-64-2 kernel: [321766.484254]  [<ffffffff810a4d75>]
unregister_timer_hook+0x35/0x40
Jun 11 11:03:43 kvm-rawhide-64-2 kernel: [321766.484267]  [<ffffffffa02cee11>]
_stp_cleanup_and_exit+0x151/0x360 [stap_f48cdaa4743be429f3c1898705b9bcb7_4500]
Jun 11 11:03:43 kvm-rawhide-64-2 kernel: [321766.484278]  [<ffffffffa02cfa4a>]
_stp_ctl_write_cmd+0x25a/0xab0 [stap_f48cdaa4743be429f3c1898705b9bcb7_4500]
Jun 11 11:03:43 kvm-rawhide-64-2 kernel: [321766.484287]  [<ffffffff8127506c>]
? security_file_permission+0x2c/0xb0
Jun 11 11:03:43 kvm-rawhide-64-2 kernel: [321766.484295]  [<ffffffff81184dac>]
vfs_write+0xac/0x180
Jun 11 11:03:43 kvm-rawhide-64-2 kernel: [321766.484300]  [<ffffffff811850da>]
sys_write+0x4a/0x90
Jun 11 11:03:43 kvm-rawhide-64-2 kernel: [321766.484308]  [<ffffffff816170a9>]
system_call_fastpath+0x16/0x1b
Jun 11 11:03:43 kvm-rawhide-64-2 kernel: [321766.484312] ---[ end trace
ed21c0994b53b38d ]---
====

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