* [Bug runtime/13146] New: memory allocation can sleep
@ 2011-09-01 14:35 dsmith at redhat dot com
2011-09-01 14:51 ` [Bug runtime/13146] " dsmith at redhat dot com
2011-09-01 14:52 ` dsmith at redhat dot com
0 siblings, 2 replies; 3+ messages in thread
From: dsmith at redhat dot com @ 2011-09-01 14:35 UTC (permalink / raw)
To: systemtap
http://sourceware.org/bugzilla/show_bug.cgi?id=13146
Bug #: 13146
Summary: memory allocation can sleep
Product: systemtap
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: runtime
AssignedTo: systemtap@sourceware.org
ReportedBy: dsmith@redhat.com
Classification: Unclassified
When the systemtap runtime allocates memory, it uses GFP_KERNEL (possibly with
other flags). GFP_KERNEL includes __GFP_WAIT, which means that the memory
allocation could possibly sleep.
Systemtap probe handlers should not sleep.
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* [Bug runtime/13146] memory allocation can sleep
2011-09-01 14:35 [Bug runtime/13146] New: memory allocation can sleep dsmith at redhat dot com
@ 2011-09-01 14:51 ` dsmith at redhat dot com
2011-09-01 14:52 ` dsmith at redhat dot com
1 sibling, 0 replies; 3+ messages in thread
From: dsmith at redhat dot com @ 2011-09-01 14:51 UTC (permalink / raw)
To: systemtap
http://sourceware.org/bugzilla/show_bug.cgi?id=13146
David Smith <dsmith at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
--- Comment #1 from David Smith <dsmith at redhat dot com> 2011-09-01 14:50:44 UTC ---
Fixed in commit 8e794e9 (which also fixes a couple of places to handle memory
allocation failures better).
Regression tested on:
RHEL4: 2.6.9-100.ELsmp (i686)
RHEL5: 2.6.18-274.el5debug (x86_64)
RHEL6: 2.6.32-192.el6.x86_64.debug (x86_64)
f15: 2.6.40.3-0.fc15.i686.debug (i686)
rawhide: 3.0.1-6.fc17.x86_64 (x86_64)
Note that this came up while working on bug #10994. During some utrace probe
handlers, memory allocation is done (typically to allocate space for a
pathname). That is fine, since utrace probe handlers are run in a sleepable
context.
However, the new utrace-free task_finder will be implemented via tracepoints,
and tracepoint probe handers are not run in a sleepable context.
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* [Bug runtime/13146] memory allocation can sleep
2011-09-01 14:35 [Bug runtime/13146] New: memory allocation can sleep dsmith at redhat dot com
2011-09-01 14:51 ` [Bug runtime/13146] " dsmith at redhat dot com
@ 2011-09-01 14:52 ` dsmith at redhat dot com
1 sibling, 0 replies; 3+ messages in thread
From: dsmith at redhat dot com @ 2011-09-01 14:52 UTC (permalink / raw)
To: systemtap
http://sourceware.org/bugzilla/show_bug.cgi?id=13146
David Smith <dsmith at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Blocks| |10994
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2011-09-01 14:35 [Bug runtime/13146] New: memory allocation can sleep dsmith at redhat dot com
2011-09-01 14:51 ` [Bug runtime/13146] " dsmith at redhat dot com
2011-09-01 14:52 ` dsmith at redhat dot com
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