* + hugetlbfs-lockdep-annotate-root-inode-properly.patch added to -mm tree
@ 2012-03-08 21:05 akpm
0 siblings, 0 replies; 2+ messages in thread
From: akpm @ 2012-03-08 21:05 UTC (permalink / raw)
To: mm-commits; +Cc: aneesh.kumar, a.p.zijlstra, davej, jwboyer, viro, zohar
The patch titled
Subject: hugetlbfs: lockdep annotate root inode properly
has been added to the -mm tree. Its filename is
hugetlbfs-lockdep-annotate-root-inode-properly.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Subject: hugetlbfs: lockdep annotate root inode properly
Fix the below lockdep warning:
======================================================
[ INFO: possible circular locking dependency detected ]
3.3.0-rc4+ #190 Not tainted
-------------------------------------------------------
shared/1568 is trying to acquire lock:
(&sb->s_type->i_mutex_key#12){+.+.+.}, at: [<ffffffff811efa0f>] hugetlbfs_file_mmap+0x7d/0x108
but task is already holding lock:
(&mm->mmap_sem){++++++}, at: [<ffffffff810f5589>] sys_mmap_pgoff+0xd4/0x12f
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&mm->mmap_sem){++++++}:
[<ffffffff8109fb8f>] lock_acquire+0xd5/0xfa
[<ffffffff810ee439>] might_fault+0x6d/0x90
[<ffffffff8111bc12>] filldir+0x6a/0xc2
[<ffffffff81129942>] dcache_readdir+0x5c/0x222
[<ffffffff8111be58>] vfs_readdir+0x76/0xac
[<ffffffff8111bf6a>] sys_getdents+0x79/0xc9
[<ffffffff816940a2>] system_call_fastpath+0x16/0x1b
-> #0 (&sb->s_type->i_mutex_key#12){+.+.+.}:
[<ffffffff8109f40a>] __lock_acquire+0xa6c/0xd60
[<ffffffff8109fb8f>] lock_acquire+0xd5/0xfa
[<ffffffff816916be>] __mutex_lock_common+0x48/0x350
[<ffffffff81691a85>] mutex_lock_nested+0x2a/0x31
[<ffffffff811efa0f>] hugetlbfs_file_mmap+0x7d/0x108
[<ffffffff810f4fd0>] mmap_region+0x26f/0x466
[<ffffffff810f545b>] do_mmap_pgoff+0x294/0x2ee
[<ffffffff810f55a9>] sys_mmap_pgoff+0xf4/0x12f
[<ffffffff8103d1f2>] sys_mmap+0x1d/0x1f
[<ffffffff816940a2>] system_call_fastpath+0x16/0x1b
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&mm->mmap_sem);
lock(&sb->s_type->i_mutex_key#12);
lock(&mm->mmap_sem);
lock(&sb->s_type->i_mutex_key#12);
*** DEADLOCK ***
1 lock held by shared/1568:
#0: (&mm->mmap_sem){++++++}, at: [<ffffffff810f5589>] sys_mmap_pgoff+0xd4/0x12f
stack backtrace:
Pid: 1568, comm: shared Not tainted 3.3.0-rc4+ #190
Call Trace:
[<ffffffff81688bf9>] print_circular_bug+0x1f8/0x209
[<ffffffff8109f40a>] __lock_acquire+0xa6c/0xd60
[<ffffffff8110e7b6>] ? files_lglock_local_lock_cpu+0x61/0x61
[<ffffffff811efa0f>] ? hugetlbfs_file_mmap+0x7d/0x108
[<ffffffff8109fb8f>] lock_acquire+0xd5/0xfa
[<ffffffff811efa0f>] ? hugetlbfs_file_mmap+0x7d/0x108
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: Josh Boyer <jwboyer@redhat.com>
Cc: Dave Jones <davej@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Mimi Zohar <zohar@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
fs/hugetlbfs/inode.c | 1 +
1 file changed, 1 insertion(+)
diff -puN fs/hugetlbfs/inode.c~hugetlbfs-lockdep-annotate-root-inode-properly fs/hugetlbfs/inode.c
--- a/fs/hugetlbfs/inode.c~hugetlbfs-lockdep-annotate-root-inode-properly
+++ a/fs/hugetlbfs/inode.c
@@ -466,6 +466,7 @@ static struct inode *hugetlbfs_get_root(
inode->i_fop = &simple_dir_operations;
/* directory inodes start off with i_nlink == 2 (for "." entry) */
inc_nlink(inode);
+ lockdep_annotate_inode_mutex_key(inode);
}
return inode;
}
_
Subject: Subject: hugetlbfs: lockdep annotate root inode properly
Patches currently in -mm which might be from aneesh.kumar@linux.vnet.ibm.com are
linux-next.patch
hugetlbfs-lockdep-annotate-root-inode-properly.patch
hugetlbfs-drop-taking-inode-i_mutex-lock-from-hugetlbfs_read.patch
^ permalink raw reply [flat|nested] 2+ messages in thread
* + hugetlbfs-lockdep-annotate-root-inode-properly.patch added to -mm tree
@ 2012-04-16 21:29 akpm
0 siblings, 0 replies; 2+ messages in thread
From: akpm @ 2012-04-16 21:29 UTC (permalink / raw)
To: mm-commits; +Cc: aneesh.kumar, a.p.zijlstra, davej, jwboyer, viro, zohar
The patch titled
Subject: hugetlbfs: lockdep annotate root inode properly
has been added to the -mm tree. Its filename is
hugetlbfs-lockdep-annotate-root-inode-properly.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Subject: hugetlbfs: lockdep annotate root inode properly
This fixes the below reported false lockdep warning. e096d0c7e2e4
("lockdep: Add helper function for dir vs file i_mutex annotation") added
a similar annotation for every other inode in hugetlbfs but missed the
root inode because it was allocated by a separate function.
For HugeTLB fs we allow taking i_mutex in mmap. HugeTLB fs doesn't
support file write and its file read callback is modified in a05b0855fd
("hugetlbfs: avoid taking i_mutex from hugetlbfs_read()") to not take
i_mutex. Hence for HugeTLB fs with regular files we really don't take
i_mutex with mmap_sem held.
======================================================
[ INFO: possible circular locking dependency detected ]
3.4.0-rc1+ #322 Not tainted
-------------------------------------------------------
bash/1572 is trying to acquire lock:
(&mm->mmap_sem){++++++}, at: [<ffffffff810f1618>] might_fault+0x40/0x90
but task is already holding lock:
(&sb->s_type->i_mutex_key#12){+.+.+.}, at: [<ffffffff81125f88>] vfs_readdir+0x56/0xa8
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&sb->s_type->i_mutex_key#12){+.+.+.}:
[<ffffffff810a09e5>] lock_acquire+0xd5/0xfa
[<ffffffff816a2f5e>] __mutex_lock_common+0x48/0x350
[<ffffffff816a3325>] mutex_lock_nested+0x2a/0x31
[<ffffffff811fb8e1>] hugetlbfs_file_mmap+0x7d/0x104
[<ffffffff810f859a>] mmap_region+0x272/0x47d
[<ffffffff810f8a39>] do_mmap_pgoff+0x294/0x2ee
[<ffffffff810f8b65>] sys_mmap_pgoff+0xd2/0x10e
[<ffffffff8103d19e>] sys_mmap+0x1d/0x1f
[<ffffffff816a5922>] system_call_fastpath+0x16/0x1b
-> #0 (&mm->mmap_sem){++++++}:
[<ffffffff810a0256>] __lock_acquire+0xa81/0xd75
[<ffffffff810a09e5>] lock_acquire+0xd5/0xfa
[<ffffffff810f1645>] might_fault+0x6d/0x90
[<ffffffff81125d62>] filldir+0x6a/0xc2
[<ffffffff81133a83>] dcache_readdir+0x5c/0x222
[<ffffffff81125fa8>] vfs_readdir+0x76/0xa8
[<ffffffff811260b6>] sys_getdents+0x79/0xc9
[<ffffffff816a5922>] system_call_fastpath+0x16/0x1b
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&sb->s_type->i_mutex_key#12);
lock(&mm->mmap_sem);
lock(&sb->s_type->i_mutex_key#12);
lock(&mm->mmap_sem);
*** DEADLOCK ***
1 lock held by bash/1572:
#0: (&sb->s_type->i_mutex_key#12){+.+.+.}, at: [<ffffffff81125f88>] vfs_readdir+0x56/0xa8
stack backtrace:
Pid: 1572, comm: bash Not tainted 3.4.0-rc1+ #322
Call Trace:
[<ffffffff81699a3c>] print_circular_bug+0x1f8/0x209
[<ffffffff810a0256>] __lock_acquire+0xa81/0xd75
[<ffffffff810f38aa>] ? handle_pte_fault+0x5ff/0x614
[<ffffffff8109e622>] ? mark_lock+0x2d/0x258
[<ffffffff810f1618>] ? might_fault+0x40/0x90
[<ffffffff810a09e5>] lock_acquire+0xd5/0xfa
[<ffffffff810f1618>] ? might_fault+0x40/0x90
[<ffffffff816a3249>] ? __mutex_lock_common+0x333/0x350
[<ffffffff810f1645>] might_fault+0x6d/0x90
[<ffffffff810f1618>] ? might_fault+0x40/0x90
[<ffffffff81125d62>] filldir+0x6a/0xc2
[<ffffffff81133a83>] dcache_readdir+0x5c/0x222
[<ffffffff81125cf8>] ? sys_ioctl+0x74/0x74
[<ffffffff81125cf8>] ? sys_ioctl+0x74/0x74
[<ffffffff81125cf8>] ? sys_ioctl+0x74/0x74
[<ffffffff81125fa8>] vfs_readdir+0x76/0xa8
[<ffffffff811260b6>] sys_getdents+0x79/0xc9
[<ffffffff816a5922>] system_call_fastpath+0x16/0x1b
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Cc: Dave Jones <davej@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Josh Boyer <jwboyer@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mimi Zohar <zohar@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
fs/hugetlbfs/inode.c | 1 +
1 file changed, 1 insertion(+)
diff -puN fs/hugetlbfs/inode.c~hugetlbfs-lockdep-annotate-root-inode-properly fs/hugetlbfs/inode.c
--- a/fs/hugetlbfs/inode.c~hugetlbfs-lockdep-annotate-root-inode-properly
+++ a/fs/hugetlbfs/inode.c
@@ -485,6 +485,7 @@ static struct inode *hugetlbfs_get_root(
inode->i_fop = &simple_dir_operations;
/* directory inodes start off with i_nlink == 2 (for "." entry) */
inc_nlink(inode);
+ lockdep_annotate_inode_mutex_key(inode);
}
return inode;
}
_
Subject: Subject: hugetlbfs: lockdep annotate root inode properly
Patches currently in -mm which might be from aneesh.kumar@linux.vnet.ibm.com are
linux-next.patch
hugetlbfs-lockdep-annotate-root-inode-properly.patch
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2012-04-16 21:29 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2012-03-08 21:05 + hugetlbfs-lockdep-annotate-root-inode-properly.patch added to -mm tree akpm
2012-04-16 21:29 akpm
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).