[Bug runtime/2922] New: BUG: sleeping function called from invalid context at kernel/mutex.c:86

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

When try the following simple probe with the current systemtap snapshot
(20060713) on 2.6.17-1.2366.fc6 on x86_64 machine (need to use work around
mentioned in Red Hat bugzilla #197220):

stap -vv -k -e 'probe begin { log ("hello world") }'

Get the following report in /var/log/messages:

Jul 13 11:27:02 dhcp59-158 kernel: BUG: sleeping function called from invalid
context at kernel/mutex.c:86
Jul 13 11:27:02 dhcp59-158 kernel: in_atomic():0, irqs_disabled():1
Jul 13 11:27:02 dhcp59-158 kernel:
Jul 13 11:27:02 dhcp59-158 kernel: Call Trace:
Jul 13 11:27:02 dhcp59-158 kernel:  [<ffffffff8026c869>] dump_stack+0x12/0x17
Jul 13 11:27:02 dhcp59-158 kernel:  [<ffffffff80264c86>] mutex_lock+0x15/0x23
Jul 13 11:27:02 dhcp59-158 kernel:  [<ffffffff803fdf49>] cpufreq_get+0x36/0x93
Jul 13 11:27:02 dhcp59-158 kernel:  [<ffffffff885c164b>]
:stap_2379:__stp_init_time+0x63/0x122
Jul 13 11:27:02 dhcp59-158 kernel:  [<ffffffff80291396>] on_each_cpu+0x19/0x22
Jul 13 11:27:02 dhcp59-158 kernel:  [<ffffffff885c0ccf>]
:stap_2379:_stp_init_time+0x19/0x30
Jul 13 11:27:02 dhcp59-158 kernel:  [<ffffffff885c1ade>]
:stap_2379:_stp_handle_start+0x9/0x49
Jul 13 11:27:02 dhcp59-158 kernel:  [<ffffffff885c1b9a>]
:stap_2379:_stp_proc_write_cmd+0x7c/0xc2
Jul 13 11:27:02 dhcp59-158 kernel:  [<ffffffff802168e4>] vfs_write+0xce/0x174
Jul 13 11:27:02 dhcp59-158 kernel:  [<ffffffff8021717e>] sys_write+0x45/0x6e
Jul 13 11:27:02 dhcp59-158 kernel:  [<ffffffff8025eace>] system_call+0x7e/0x83

Code in src/runtime/time.c is causing the problem:

int
_stp_init_time(void)
{
    int ret = 0;

    ret = on_each_cpu(__stp_init_time, NULL, 0, 1);

#ifdef CONFIG_CPU_FREQ
    if (ret == 0)
        ret = cpufreq_register_notifier(&__stp_time_notifier,
                CPUFREQ_TRANSITION_NOTIFIER);
#endif

    return ret;
}

-- 
           Summary: BUG: sleeping function called from invalid context at
                    kernel/mutex.c:86
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
        AssignedTo: systemtap at sources dot redhat dot com
        ReportedBy: wcohen at redhat dot com
GCC target triplet: x86_64


http://sourceware.org/bugzilla/show_bug.cgi?id=2922

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