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Bug 455337 - 2.6.26-136.fc10.i686: INFO: hard-read-safe -> hard-read-unsafe lock order detected
Summary: 2.6.26-136.fc10.i686: INFO: hard-read-safe -> hard-read-unsafe lock order det...
Alias: None
Product: Fedora
Classification: Fedora
Component: kernel
Version: rawhide
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Kernel Maintainer List
QA Contact: Fedora Extras Quality Assurance
Depends On:
TreeView+ depends on / blocked
Reported: 2008-07-14 21:11 UTC by Tom London
Modified: 2008-10-10 04:18 UTC (History)
0 users

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2008-10-10 04:18:46 UTC

Attachments (Terms of Use)
Complete INFO spew (deleted)
2008-07-14 21:11 UTC, Tom London
no flags Details

Description Tom London 2008-07-14 21:11:59 UTC
Description of problem:
Got the following INFO in /var/log/messages (complete spew attached below):

[ INFO: hard-read-safe -> hard-read-unsafe lock order detected ]
2.6.26-136.fc10.i686 #1
strace/4454 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
 (&utrace->lock){--..}, at: [<c045b904>] get_utrace_lock_attached+0x4a/0x8d

and this task is already holding:
 (tasklist_lock){..??}, at: [<c042db06>] do_exit+0x2f3/0x784
which would create a new lock dependency:
 (tasklist_lock){..??} -> (&utrace->lock){--..}

Version-Release number of selected component (if applicable):

How reproducible:
Don't know

Steps to Reproduce:
Actual results:

Expected results:

Additional info:

Comment 1 Tom London 2008-07-14 21:11:59 UTC
Created attachment 311778 [details]
Complete INFO spew

Comment 2 Tom London 2008-07-14 21:14:16 UTC
Not 100% sure, but I think I was doing "strace ping".

That fails when run as a "ordinary" user, but succeeds if run as root.

Comment 3 Tom London 2008-10-06 16:02:41 UTC
Haven't seen this for quite some time.


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