From: Dave Jones <davej@redhat.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>
Subject: hugetlb locking bug.
Date: Fri, 15 Apr 2011 16:16:52 -0400 [thread overview]
Message-ID: <20110415201652.GA5131@redhat.com> (raw)
Just hit this lockdep report..
Dave
=======================================================
[ INFO: possible circular locking dependency detected ]
2.6.39-rc3+ #3
-------------------------------------------------------
trinity/11299 is trying to acquire lock:
(&sb->s_type->i_mutex_key#18){+.+.+.}, at: [<ffffffff811ebfec>] hugetlbfs_file_mmap+0x7f/0x10d
but task is already holding lock:
(&mm->mmap_sem){++++++}, at: [<ffffffff81109097>] sys_mmap_pgoff+0xf8/0x16a
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&mm->mmap_sem){++++++}:
[<ffffffff81086c59>] lock_acquire+0xd0/0xfb
[<ffffffff81100cd0>] might_fault+0x89/0xac
[<ffffffff8114159b>] filldir+0x6f/0xc7
[<ffffffff81150075>] dcache_readdir+0x67/0x204
[<ffffffff811417ed>] vfs_readdir+0x78/0xb1
[<ffffffff8114190c>] sys_getdents+0x7e/0xd1
[<ffffffff814c22c2>] system_call_fastpath+0x16/0x1b
-> #0 (&sb->s_type->i_mutex_key#18){+.+.+.}:
[<ffffffff810864e6>] __lock_acquire+0x99e/0xc81
[<ffffffff81086c59>] lock_acquire+0xd0/0xfb
[<ffffffff814b9d00>] __mutex_lock_common+0x4c/0x35b
[<ffffffff814ba0d3>] mutex_lock_nested+0x3e/0x43
[<ffffffff811ebfec>] hugetlbfs_file_mmap+0x7f/0x10d
[<ffffffff81108ac8>] mmap_region+0x26d/0x446
[<ffffffff81108f45>] do_mmap_pgoff+0x2a4/0x2fe
[<ffffffff811090b7>] sys_mmap_pgoff+0x118/0x16a
[<ffffffff8100c56c>] sys_mmap+0x22/0x24
[<ffffffff814c22c2>] system_call_fastpath+0x16/0x1b
other info that might help us debug this:
1 lock held by trinity/11299:
#0: (&mm->mmap_sem){++++++}, at: [<ffffffff81109097>] sys_mmap_pgoff+0xf8/0x16a
stack backtrace:
Pid: 11299, comm: trinity Not tainted 2.6.39-rc3+ #3
Call Trace:
[<ffffffff814b1126>] print_circular_bug+0xa6/0xb5
[<ffffffff810864e6>] __lock_acquire+0x99e/0xc81
[<ffffffff811ebfec>] ? hugetlbfs_file_mmap+0x7f/0x10d
[<ffffffff81086c59>] lock_acquire+0xd0/0xfb
[<ffffffff811ebfec>] ? hugetlbfs_file_mmap+0x7f/0x10d
[<ffffffff811ebfec>] ? hugetlbfs_file_mmap+0x7f/0x10d
[<ffffffff814b9d00>] __mutex_lock_common+0x4c/0x35b
[<ffffffff811ebfec>] ? hugetlbfs_file_mmap+0x7f/0x10d
[<ffffffff814b3ee2>] ? __slab_alloc+0xdb/0x3b7
[<ffffffff81087043>] ? trace_hardirqs_on_caller+0x10b/0x12f
[<ffffffff814b3eeb>] ? __slab_alloc+0xe4/0x3b7
[<ffffffff81108a12>] ? mmap_region+0x1b7/0x446
[<ffffffff814ba0d3>] mutex_lock_nested+0x3e/0x43
[<ffffffff811ebfec>] hugetlbfs_file_mmap+0x7f/0x10d
[<ffffffff81108ac8>] mmap_region+0x26d/0x446
[<ffffffff81108f45>] do_mmap_pgoff+0x2a4/0x2fe
[<ffffffff811090b7>] sys_mmap_pgoff+0x118/0x16a
[<ffffffff81087043>] ? trace_hardirqs_on_caller+0x10b/0x12f
[<ffffffff8100c56c>] sys_mmap+0x22/0x24
[<ffffffff814c22c2>] system_call_fastpath+0x16/0x1b
next reply other threads:[~2011-04-15 20:17 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-15 20:16 Dave Jones [this message]
2011-04-15 20:49 ` hugetlb locking bug Linus Torvalds
2011-04-15 20:57 ` Christoph Hellwig
2011-04-15 21:09 ` Peter Zijlstra
2011-04-15 21:13 ` Christoph Hellwig
2011-04-15 21:23 ` Peter Zijlstra
2011-04-15 21:19 ` Linus Torvalds
2011-04-15 21:26 ` Christoph Hellwig
2011-04-15 21:27 ` Linus Torvalds
2011-12-14 11:59 ` Mimi Zohar
2011-04-15 21:07 ` Peter Zijlstra
-- strict thread matches above, loose matches on Subject: below --
2011-08-22 15:34 Josh Boyer
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20110415201652.GA5131@redhat.com \
--to=davej@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=torvalds@linux-foundation.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.