[Bug runtime/13868] New: Use UTRACE_ATTACH_ATOMIC when calling utrace create under lock.

[Bug runtime/13868] New: Use UTRACE_ATTACH_ATOMIC when calling utrace create under lock.

[mjw at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=13868

             Bug #: 13868
           Summary: Use UTRACE_ATTACH_ATOMIC when calling utrace create
                    under lock.
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: runtime
        AssignedTo: systemtap@sourceware.org
        ReportedBy: mjw@redhat.com
    Classification: Unclassified


commit e46635d5571a655868c2fd57e186fb6edbe77d78
Author: Mark Wielaard <mjw@redhat.com>
Date:   Tue Jan 31 23:06:30 2012 +0100

    Use UTRACE_ATTACH_ATOMIC when calling utrace create under lock.

    UTRACE_ATTACH_ATOMIC is very new, but we need it when calling
    utrace create while holding a lock or in interrupt context.
    If it doesn't exist we do as before (define it as zero).

    See http://sourceware.org/ml/systemtap/2011-q4/msg00340.html

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[Bug runtime/13868] Use UTRACE_ATTACH_ATOMIC when calling utrace create under lock.

[fche at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=13868

Frank Ch. Eigler <fche at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |fche at redhat dot com

--- Comment #1 from Frank Ch. Eigler <fche at redhat dot com> 2012-03-19 19:29:21 UTC ---
See required utrace patch at
https://www.redhat.com/archives/utrace-devel/2012-January/msg00001.html

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[Bug runtime/13868] Use UTRACE_ATTACH_ATOMIC when calling utrace create under lock.

[fche at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=13868

Frank Ch. Eigler <fche at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

--- Comment #2 from Frank Ch. Eigler <fche at redhat dot com> 2012-03-19 19:41:48 UTC ---
Sample kernel BUG backtrace that is fixed by this work:

<3>[ 5423.930203] BUG: sleeping function called from invalid context at
xxx/intel/linux/mm/slub.c:847
<3>[ 5423.948137] in_atomic(): 0, irqs_disabled(): 0, pid: 3196, name: stapio
<4>[ 5423.956007] 1 lock held by stapio/3196:
<4>[ 5423.959994]  #0:  (rcu_read_lock){.+.+.+}, at: [<f1600603>]
rcu_read_lock+0x0/0x26 [utracetestgdwv2]
<4>[ 5423.969609] Pid: 3196, comm: stapio Tainted: G        WC  3.0.8-dirty #1
<4>[ 5423.976924] Call Trace:
<4>[ 5423.979413]  [<c10795e2>] ? utrace_attach_task+0x140/0x369
<4>[ 5423.984939]  [<c102aad7>] __might_sleep+0xee/0xf5
<4>[ 5423.989736]  [<c10d17f6>] kmem_cache_alloc+0x37/0x132
<4>[ 5423.994824]  [<c10795e2>] utrace_attach_task+0x140/0x369
<4>[ 5424.000240]  [<f1600603>] ? next_thread+0x2b/0x2b [utracetestgdwv2]
<4>[ 5424.006553]  [<f1603007>] T.1331+0x41/0x15b [utracetestgdwv2]
<4>[ 5424.012425]  [<f1603b65>] _stp_ctl_write_cmd+0x56a/0xac4
[utracetestgdwv2]
<4>[ 5424.019349]  [<c11f9f1a>] ? security_file_permission+0x22/0x26

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