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
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