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Ingo Molnar f04b30de3c inotify: fix GFP_KERNEL related deadlock 
Enhanced lockdep coverage of __GFP_NOFS turned up this new lockdep
assert:

[ 1093.677775]
[ 1093.677781] =================================
[ 1093.680031] [ INFO: inconsistent lock state ]
[ 1093.680031] 2.6.29-rc5-tip-01504-gb49eca1-dirty #1
[ 1093.680031] ---------------------------------
[ 1093.680031] inconsistent {RECLAIM_FS-ON-W} -> {IN-RECLAIM_FS-W} usage.
[ 1093.680031] kswapd0/308 [HC0[0]:SC0[0]:HE1:SE1] takes:
[ 1093.680031]  (&inode->inotify_mutex){+.+.?.}, at: [<c0205942>] inotify_inode_is_dead+0x20/0x80
[ 1093.680031] {RECLAIM_FS-ON-W} state was registered at:
[ 1093.680031]   [<c01696b9>] mark_held_locks+0x43/0x5b
[ 1093.680031]   [<c016baa4>] lockdep_trace_alloc+0x6c/0x6e
[ 1093.680031]   [<c01cf8b0>] kmem_cache_alloc+0x20/0x150
[ 1093.680031]   [<c040d0ec>] idr_pre_get+0x27/0x6c
[ 1093.680031]   [<c02056e3>] inotify_handle_get_wd+0x25/0xad
[ 1093.680031]   [<c0205f43>] inotify_add_watch+0x7a/0x129
[ 1093.680031]   [<c020679e>] sys_inotify_add_watch+0x20f/0x250
[ 1093.680031]   [<c010389e>] sysenter_do_call+0x12/0x35
[ 1093.680031]   [<ffffffff>] 0xffffffff
[ 1093.680031] irq event stamp: 60417
[ 1093.680031] hardirqs last  enabled at (60417): [<c018d5f5>] call_rcu+0x53/0x59
[ 1093.680031] hardirqs last disabled at (60416): [<c018d5b9>] call_rcu+0x17/0x59
[ 1093.680031] softirqs last  enabled at (59656): [<c0146229>] __do_softirq+0x157/0x16b
[ 1093.680031] softirqs last disabled at (59651): [<c0106293>] do_softirq+0x74/0x15d
[ 1093.680031]
[ 1093.680031] other info that might help us debug this:
[ 1093.680031] 2 locks held by kswapd0/308:
[ 1093.680031]  #0:  (shrinker_rwsem){++++..}, at: [<c01b0502>] shrink_slab+0x36/0x189
[ 1093.680031]  #1:  (&type->s_umount_key#4){+++++.}, at: [<c01e6d77>] shrink_dcache_memory+0x110/0x1fb
[ 1093.680031]
[ 1093.680031] stack backtrace:
[ 1093.680031] Pid: 308, comm: kswapd0 Not tainted 2.6.29-rc5-tip-01504-gb49eca1-dirty #1
[ 1093.680031] Call Trace:
[ 1093.680031]  [<c016947a>] valid_state+0x12a/0x13d
[ 1093.680031]  [<c016954e>] mark_lock+0xc1/0x1e9
[ 1093.680031]  [<c016a5b4>] ? check_usage_forwards+0x0/0x3f
[ 1093.680031]  [<c016ab74>] __lock_acquire+0x2c6/0xac8
[ 1093.680031]  [<c01688d9>] ? register_lock_class+0x17/0x228
[ 1093.680031]  [<c016b3d3>] lock_acquire+0x5d/0x7a
[ 1093.680031]  [<c0205942>] ? inotify_inode_is_dead+0x20/0x80
[ 1093.680031]  [<c08824c4>] __mutex_lock_common+0x3a/0x4cb
[ 1093.680031]  [<c0205942>] ? inotify_inode_is_dead+0x20/0x80
[ 1093.680031]  [<c08829ed>] mutex_lock_nested+0x2e/0x36
[ 1093.680031]  [<c0205942>] ? inotify_inode_is_dead+0x20/0x80
[ 1093.680031]  [<c0205942>] inotify_inode_is_dead+0x20/0x80
[ 1093.680031]  [<c01e6672>] dentry_iput+0x90/0xc2
[ 1093.680031]  [<c01e67a3>] d_kill+0x21/0x45
[ 1093.680031]  [<c01e6a46>] __shrink_dcache_sb+0x27f/0x355
[ 1093.680031]  [<c01e6dc5>] shrink_dcache_memory+0x15e/0x1fb
[ 1093.680031]  [<c01b05ed>] shrink_slab+0x121/0x189
[ 1093.680031]  [<c01b0d12>] kswapd+0x39f/0x561
[ 1093.680031]  [<c01ae499>] ? isolate_pages_global+0x0/0x233
[ 1093.680031]  [<c0157eae>] ? autoremove_wake_function+0x0/0x43
[ 1093.680031]  [<c01b0973>] ? kswapd+0x0/0x561
[ 1093.680031]  [<c0157daf>] kthread+0x41/0x82
[ 1093.680031]  [<c0157d6e>] ? kthread+0x0/0x82
[ 1093.680031]  [<c01043ab>] kernel_thread_helper+0x7/0x10

inotify_handle_get_wd() does idr_pre_get() which does a
kmem_cache_alloc() without __GFP_FS - and is hence deadlockable under
extreme MM pressure.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: MinChan Kim <minchan.kim@gmail.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-02-18 15:37:56 -08:00
..
9p
fs/Kconfig: move 9p out
2009-01-22 13:16:01 +03:00
adfs
fs/Kconfig: move adfs out
2009-01-22 13:15:56 +03:00
affs
fs/Kconfig: move affs out
2009-01-22 13:15:56 +03:00
afs
fs/Kconfig: move afs out
2009-01-22 13:16:01 +03:00
autofs
fs/Kconfig: move autofs, autofs4 out
2009-01-22 13:15:54 +03:00
autofs4
fs/Kconfig: move autofs, autofs4 out
2009-01-22 13:15:54 +03:00
befs
fs/Kconfig: move befs out
2009-01-22 13:15:57 +03:00
bfs
fs/Kconfig: move bfs out
2009-01-22 13:15:57 +03:00
btrfs
Btrfs: hold trans_mutex when using btrfs_record_root_in_trans
2009-02-12 14:14:53 -05:00
cifs
cifs: make sure we allocate enough storage for socket address
2009-01-29 03:32:13 +00:00
coda
fs/Kconfig: move coda out
2009-01-22 13:16:01 +03:00
configfs
Revert "configfs: Silence lockdep on mkdir(), rmdir() and configfs_depend_item()"
2009-02-04 09:46:25 -08:00
cramfs
fs/Kconfig: move cramfs out
2009-01-22 13:15:58 +03:00
debugfs
debugfs: add helpers for exporting a size_t simple value
2009-01-07 10:00:16 -08:00
devpts
zero i_uid/i_gid on inode allocation
2009-01-05 11:54:28 -05:00
dlm
dlm: initialize file_lock struct in GETLK before copying conflicting lock
2009-01-21 15:28:45 -06:00
ecryptfs
eCryptfs: Regression in unencrypted filename symlinks
2009-02-06 18:36:40 -08:00
efs
fs/Kconfig: move efs out
2009-01-22 13:15:57 +03:00
exportfs
Merge branch 'next' into for-linus
2008-12-25 11:40:09 +11:00
ext2
ext2/xip: refuse to change xip flag during remount with busy inodes
2009-02-11 14:25:36 -08:00
ext3
ext3: revert "ext3: wait on all pending commits in ext3_sync_fs"
2009-02-11 14:25:35 -08:00
ext4
ext4: Fix NULL dereference in ext4_ext_migrate()'s error handling
2009-02-15 20:02:19 -05:00
fat
fs/Kconfig: move fat out
2009-01-22 13:15:55 +03:00
freevxfs
fs/Kconfig: move vxfs out
2009-01-22 13:15:58 +03:00
fuse
Merge branch 'Kconfig' of git://git.kernel.org/pub/scm/linux/kernel/git/adobriyan/misc
2009-01-26 10:08:50 -08:00
gfs2
filesystem freeze: add error handling of write_super_lockfs/unlockfs
2009-01-09 16:54:42 -08:00
hfs
fs/Kconfig: move hfs, hfsplus out
2009-01-22 13:15:57 +03:00
hfsplus
fs/Kconfig: move hfs, hfsplus out
2009-01-22 13:15:57 +03:00
hostfs
fs: symlink write_begin allocation context fix
2009-01-04 13:33:20 -08:00
hpfs
fs/Kconfig: move hpfs out
2009-01-22 13:15:59 +03:00
hppfs
CRED: Use creds in file structs
2008-11-14 10:39:25 +11:00
hugetlbfs
Do not account for the address space used by hugetlbfs using VM_ACCOUNT
2009-02-10 10:48:42 -08:00
isofs
fs/Kconfig: move iso9660, udf out
2009-01-22 13:15:55 +03:00
jbd
jbd: fix return value of journal_start_commit()
2009-02-11 14:25:35 -08:00
jbd2
jbd2: Avoid possible NULL dereference in jbd2_journal_begin_ordered_truncate()
2009-02-10 11:15:34 -05:00
jffs2
[JFFS2] remove junk prototypes
2009-01-09 21:05:21 +00:00
jfs
fs/Kconfig: move jfs out
2009-01-22 13:15:54 +03:00
lockd
lockd: fix regression in lockd's handling of blocked locks
2009-02-09 13:19:46 -05:00
minix
fs/Kconfig: move minix out
2009-01-22 13:15:58 +03:00
ncpfs
fs/Kconfig: move the rest of ncpfs out
2009-01-22 13:16:01 +03:00
nfs
fs/Kconfig: move nfs out
2009-01-22 13:16:00 +03:00
nfs_common
SUNRPC: nfsacl_encode/nfsacl_decode should be exported as GPL-only
2008-12-23 15:21:32 -05:00
nfsd
nfsd: only set file_lock.fl_lmops in nfsd4_lockt if a stateowner is found
2009-01-27 17:26:59 -05:00
nls
remove CONFIG_KMOD from fs
2008-10-17 02:38:36 +11:00
notify
inotify: fix GFP_KERNEL related deadlock
2009-02-18 15:37:56 -08:00
ntfs
fs/Kconfig: move ntfs out
2009-01-22 13:15:55 +03:00
ocfs2
jbd2: Avoid possible NULL dereference in jbd2_journal_begin_ordered_truncate()
2009-02-10 11:15:34 -05:00
omfs
fs/Kconfig: move omfs out
2009-01-22 13:15:58 +03:00
openpromfs
zero i_uid/i_gid on inode allocation
2009-01-05 11:54:28 -05:00
partitions
block: fix bug in ptbl lookup cache
2009-01-09 21:46:13 +01:00
proc
Merge git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-2.6-nommu
2009-01-09 14:00:58 -08:00
qnx4
fs/Kconfig: move qnx4 out
2009-01-22 13:15:59 +03:00
ramfs
NOMMU: Fix cleanup handling in ramfs_nommu_get_umapped_area()
2009-01-08 12:04:46 +00:00
reiserfs
fs/Kconfig: move reiserfs out
2009-01-22 13:15:53 +03:00
romfs
fs/Kconfig: move romfs out
2009-01-22 13:15:59 +03:00
smbfs
fs/Kconfig: move smbfs out
2009-01-22 13:16:01 +03:00
squashfs
fs/Kconfig: move squashfs out
2009-01-22 13:15:58 +03:00
sysfs
Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6
2009-01-26 10:40:28 -08:00
sysv
fs/Kconfig: move sysv out
2009-01-22 13:15:59 +03:00
ubifs
UBIFS: remove fast unmounting
2009-01-29 16:34:30 +02:00
udf
fs/Kconfig: move iso9660, udf out
2009-01-22 13:15:55 +03:00
ufs
fs/Kconfig: move ufs out
2009-01-22 13:16:00 +03:00
xfs
[XFS] Warn on transaction in flight on read-only remount
2009-02-03 11:04:54 -06:00
aio.c
[CVE-2009-0029] System call wrappers part 16
2009-01-14 14:15:25 +01:00
anon_inodes.c
anon_inodes: use fops->owner for module refcount
2008-12-31 16:55:44 +02:00
attr.c
CRED: Wrap task credential accesses in the filesystem subsystem
2008-11-14 10:39:05 +11:00
bad_inode.c
kill ->dir_notify()
2008-12-31 18:07:43 -05:00
binfmt_aout.c
sanitize ifdefs in binfmt_aout
2009-01-03 11:45:54 -08:00
binfmt_elf_fdpic.c
FDPIC: Don't attempt to expand the userspace stack to fill the space allocated
2009-01-08 12:04:47 +00:00
binfmt_elf.c
elf core dump: fix get_user use
2009-02-06 17:34:07 -08:00
binfmt_em86.c
Allow recursion in binfmt_script and binfmt_misc
2008-10-16 11:21:38 -07:00
binfmt_flat.c
FLAT: Don't attempt to expand the userspace stack to fill the space allocated
2009-01-08 12:04:47 +00:00
binfmt_misc.c
fs/binfmt_misc.c: add terminating newline to /proc/sys/fs/binfmt_misc/status
2009-01-06 15:59:19 -08:00
binfmt_script.c
Allow recursion in binfmt_script and binfmt_misc
2008-10-16 11:21:38 -07:00
binfmt_som.c
CRED: Make execve() take advantage of copy-on-write credentials
2008-11-14 10:39:24 +11:00
bio-integrity.c
block: Remove obsolete BUG_ON
2009-01-30 12:34:36 +01:00
bio.c
[SCSI] block: make blk_rq_map_user take a NULL user-space buffer for WRITE
2009-01-02 11:10:35 -06:00
block_dev.c
filesystem freeze: implement generic freeze feature
2009-01-09 16:54:42 -08:00
buffer.c
mm: task dirty accounting fix
2009-02-18 15:37:54 -08:00
char_dev.c
fs: fix name overwrite in __register_chrdev_region()
2009-01-06 15:59:13 -08:00
compat_binfmt_elf.c
x86: compat_binfmt_elf
2008-01-30 13:31:46 +01:00
compat_ioctl.c
vt: Declare PIO_CMAP/GIO_CMAP as compatbile ioctls.
2009-02-18 15:37:56 -08:00
compat.c
CRED: Fix SUID exec regression
2009-02-07 08:46:18 +11:00
dcache.c
[CVE-2009-0029] System call wrappers part 20
2009-01-14 14:15:26 +01:00
dcookies.c
[CVE-2009-0029] System call wrapper special cases
2009-01-14 14:15:18 +01:00
direct-io.c
fs: truncate blocks outside i_size after O_DIRECT write error
2009-01-06 15:59:06 -08:00
dquot.c
quota: Improve locking
2009-01-16 18:02:10 +01:00
drop_caches.c
vfs: skip inodes without pages to free in drop_pagecache_sb()
2008-04-29 08:06:05 -07:00
eventfd.c
[CVE-2009-0029] System call wrappers part 32
2009-01-14 14:15:31 +01:00
eventpoll.c
epoll: drop max_user_instances and rely only on max_user_watches
2009-01-29 18:04:45 -08:00
exec.c
CRED: Fix SUID exec regression
2009-02-07 08:46:18 +11:00
fcntl.c
[CVE-2009-0029] System call wrappers part 15
2009-01-14 14:15:24 +01:00
fifo.c
[PATCH] introduce fmode_t, do annotations
2008-10-21 07:47:06 -04:00
file_table.c
filp_cachep can be static in fs/file_table.c
2008-12-31 18:07:42 -05:00
file.c
[PATCH] merge locate_fd() and get_unused_fd()
2008-08-01 11:25:23 -04:00
filesystems.c
[CVE-2009-0029] System call wrappers part 27
2009-01-14 14:15:29 +01:00
fs-writeback.c
fs: sys_sync fix
2009-01-06 15:59:09 -08:00
generic_acl.c
…
inode.c
partial revert of asynchronous inode delete
2009-01-09 13:15:49 -08:00
internal.h
CRED: Fix SUID exec regression
2009-02-07 08:46:18 +11:00
ioctl.c
[CVE-2009-0029] System call wrappers part 15
2009-01-14 14:15:24 +01:00
ioprio.c
[CVE-2009-0029] System call wrappers part 28
2009-01-14 14:15:30 +01:00
Kconfig
fs/Kconfig: move 9p out
2009-01-22 13:16:01 +03:00
Kconfig.binfmt
CORE_DUMP_DEFAULT_ELF_HEADERS depends on ELF_CORE
2009-01-09 16:54:41 -08:00
libfs.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
2009-01-05 18:32:06 -08:00
locks.c
[CVE-2009-0029] System call wrappers part 16
2009-01-14 14:15:25 +01:00
Makefile
Merge git://git.kernel.org/pub/scm/linux/kernel/git/pkl/squashfs-linus
2009-01-09 15:18:49 -08:00
mbcache.c
vfs: fix possible deadlock in ext2, ext3, ext4 when using xattrs
2008-04-15 19:35:41 -07:00
mpage.c
do_mpage_readpage(): remove useless clear_buffer_mapped() call
2009-01-06 15:59:01 -08:00
namei.c
[CVE-2009-0029] System call wrappers part 29
2009-01-14 14:15:30 +01:00
namespace.c
Fix incomplete __mntput locking
2009-02-17 14:02:08 -08:00
nfsctl.c
[CVE-2009-0029] System call wrappers part 27
2009-01-14 14:15:29 +01:00
no-block.c
…
open.c
[CVE-2009-0029] System call wrappers part 30
2009-01-14 14:15:30 +01:00
pipe.c
[CVE-2009-0029] System call wrappers part 33
2009-01-14 14:15:32 +01:00
pnode.c
[patch 7/7] vfs: mountinfo: show dominating group id
2008-04-23 00:05:09 -04:00
pnode.h
[patch 7/7] vfs: mountinfo: show dominating group id
2008-04-23 00:05:09 -04:00
posix_acl.c
CRED: Wrap task credential accesses in the filesystem subsystem
2008-11-14 10:39:05 +11:00
quota_tree.c
quota: Split off quota tree handling into a separate file
2009-01-05 08:40:21 -08:00
quota_tree.h
quota: Split off quota tree handling into a separate file
2009-01-05 08:40:21 -08:00
quota_v1.c
quota: Move quotaio_v[12].h from include/linux/ to fs/
2009-01-05 08:36:58 -08:00
quota_v2.c
quota: Convert union in mem_dqinfo to a pointer
2009-01-05 08:40:21 -08:00
quota.c
[CVE-2009-0029] System call wrappers part 20
2009-01-14 14:15:26 +01:00
quotaio_v1.h
quota: Move quotaio_v[12].h from include/linux/ to fs/
2009-01-05 08:36:58 -08:00
quotaio_v2.h
quota: Split off quota tree handling into a separate file
2009-01-05 08:40:21 -08:00
read_write.c
[CVE-2009-0029] System call wrappers part 20
2009-01-14 14:15:26 +01:00
read_write.h
…
readdir.c
[CVE-2009-0029] System call wrappers part 32
2009-01-14 14:15:31 +01:00
select.c
[CVE-2009-0029] System call wrappers part 32
2009-01-14 14:15:31 +01:00
seq_file.c
seq_file: properly cope with pread
2009-02-18 15:37:53 -08:00
signalfd.c
[CVE-2009-0029] System call wrappers part 31
2009-01-14 14:15:31 +01:00
splice.c
[CVE-2009-0029] System call wrappers part 31
2009-01-14 14:15:31 +01:00
stack.c
…
stat.c
[CVE-2009-0029] System call wrappers part 30
2009-01-14 14:15:30 +01:00
super.c
fs/super.c: add lockdep annotation to s_umount
2009-02-18 15:37:55 -08:00
sync.c
[CVE-2009-0029] System call wrappers part 09
2009-01-14 14:15:21 +01:00
timerfd.c
timerfd: add flags check
2009-02-18 15:37:53 -08:00
utimes.c
[CVE-2009-0029] System call wrappers part 30
2009-01-14 14:15:30 +01:00
xattr_acl.c
…
xattr.c
[CVE-2009-0029] System call wrappers part 13
2009-01-14 14:15:23 +01:00