Sahitya Tummala b17c070fb6 fs/dcache.c: fix spin lockup issue on nlru->lock ... __list_lru_walk_one() acquires nlru spin lock (nlru->lock) for longer duration if there are more number of items in the lru list. As per the current code, it can hold the spin lock for upto maximum UINT_MAX entries at a time. So if there are more number of items in the lru list, then "BUG: spinlock lockup suspected" is observed in the below path: spin_bug+0x90 do_raw_spin_lock+0xfc _raw_spin_lock+0x28 list_lru_add+0x28 dput+0x1c8 path_put+0x20 terminate_walk+0x3c path_lookupat+0x100 filename_lookup+0x6c user_path_at_empty+0x54 SyS_faccessat+0xd0 el0_svc_naked+0x24 This nlru->lock is acquired by another CPU in this path - d_lru_shrink_move+0x34 dentry_lru_isolate_shrink+0x48 __list_lru_walk_one.isra.10+0x94 list_lru_walk_node+0x40 shrink_dcache_sb+0x60 do_remount_sb+0xbc do_emergency_remount+0xb0 process_one_work+0x228 worker_thread+0x2e0 kthread+0xf4 ret_from_fork+0x10 Fix this lockup by reducing the number of entries to be shrinked from the lru list to 1024 at once. Also, add cond_resched() before processing the lru list again. Link: http://marc.info/?t=149722864900001&r=1&w=2 Link: http://lkml.kernel.org/r/1498707575-2472-1-git-send-email-stummala@codeaurora.org Signed-off-by: Sahitya Tummala <stummala@codeaurora.org> Suggested-by: Jan Kara <jack@suse.cz> Suggested-by: Vladimir Davydov <vdavydov.dev@gmail.com> Acked-by: Vladimir Davydov <vdavydov.dev@gmail.com> Cc: Alexander Polakov <apolyakov@beget.ru> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2017-07-10 16:32:33 -07:00
..
9p	9p: Convert to separately allocated bdi	2017-04-20 12:09:55 -06:00
adfs
affs	fs/affs: add rename exchange	2017-05-05 15:24:52 -04:00
afs	afs: Add metadata xattrs	2017-07-09 14:40:12 -07:00
autofs4	Merge branch 'linus' into sched/core, to pick up fixes	2017-06-24 08:57:20 +02:00
befs	befs: make export work with cold dcache	2017-05-05 11:35:35 +01:00
bfs	Tigran has moved	2017-05-12 15:57:15 -07:00
btrfs	Merge branch 'nowait-aio-btrfs-fixup' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux	2017-07-10 10:27:48 -07:00
cachefiles	sched/wait: Disambiguate wq_entry->task_list and wq_head->task_list naming	2017-06-20 12:19:14 +02:00
ceph	ceph: unify inode i_ctime update	2017-06-14 19:37:23 +02:00
cifs	first set of cifs fixes for 4.13, bug fixes and improved POSIX character mapping	2017-07-07 17:44:36 -07:00
coda	fs: implement vfs_iter_write using do_iter_write	2017-06-29 17:49:23 -04:00
configfs	configfs: Introduce config_item_get_unless_zero()	2017-06-12 13:20:20 +02:00
cramfs
crypto	The first major feature for ext4 this merge window is the largedir	2017-07-09 09:31:22 -07:00
debugfs	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-07-08 10:50:54 -07:00
devpts
dlm	net: Work around lockdep limitation in sockets that use sockets	2017-03-09 18:23:27 -08:00
ecryptfs	ecryptfs: Convert to separately allocated bdi	2017-04-20 12:09:55 -06:00
efivarfs
efs
exofs	mm: drop "wait" parameter from write_one_page()	2017-07-05 18:44:22 -04:00
exportfs	Merge branch 'rebased-statx' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-03-03 11:38:56 -08:00
ext2	The first major feature for ext4 this merge window is the largedir	2017-07-09 09:31:22 -07:00
ext4	The first major feature for ext4 this merge window is the largedir	2017-07-09 09:31:22 -07:00
f2fs	Merge branch 'for-4.13/block' of git://git.kernel.dk/linux-block	2017-07-03 10:34:51 -07:00
fat	fat: fix using uninitialized fields of fat_inode/fsinfo_inode	2017-03-09 17:01:10 -08:00
freevxfs
fscache	KEYS: Differentiate uses of rcu_dereference_key() and user_key_payload()	2017-03-02 10:09:00 +11:00
fuse	Merge branch 'for-linus' of git://git.kernel.dk/linux-block	2017-05-20 16:12:30 -07:00
gfs2	Writeback error handling fixes (pile #2)	2017-07-07 19:38:17 -07:00
hfs	fs: semove set but not checked AOP_FLAG_UNINTERRUPTIBLE flag	2017-05-08 17:15:14 -07:00
hfsplus	fs: semove set but not checked AOP_FLAG_UNINTERRUPTIBLE flag	2017-05-08 17:15:14 -07:00
hostfs
hpfs	sched/headers: Prepare to move signal wakeup & sigpending methods from <linux/sched.h> into <linux/sched/signal.h>	2017-03-02 08:42:32 +01:00
hugetlbfs	mm: hwpoison: dissolve in-use hugepage in unrecoverable memory error	2017-07-10 16:32:30 -07:00
isofs	sched/headers: Prepare to remove <linux/cred.h> inclusion from <linux/sched.h>	2017-03-02 08:42:31 +01:00
jbd2	Writeback error handling fixes (pile #2)	2017-07-07 19:38:17 -07:00
jffs2	jffs2: fix spelling mistake: "requestied" -> "requested"	2017-04-19 11:35:55 -07:00
jfs	Writeback error handling fixes (pile #1)	2017-07-07 18:39:15 -07:00
kernfs	kernfs: Check KERNFS_HAS_RELEASE before calling kernfs_release_file()	2017-03-17 10:25:59 +09:00
lockd	Another RDMA update from Chuck Lever, and a bunch of miscellaneous	2017-05-10 13:29:23 -07:00
minix	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-07-08 10:50:54 -07:00
ncpfs	mm: per-cgroup memory reclaim stats	2017-07-06 16:24:35 -07:00
nfs	Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security	2017-07-05 11:26:35 -07:00
nfs_common
nfsd	Merge branch 'work.read_write' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-07-05 14:35:57 -07:00
nilfs2	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2017-07-03 13:08:04 -07:00
nls
notify	dentry name snapshots	2017-07-07 20:09:10 -04:00
ntfs	ntfs: Use ERR_CAST() to avoid cross-structure cast	2017-05-28 10:11:48 -07:00
ocfs2	ocfs2: constify attribute_group structures	2017-07-06 16:24:30 -07:00
omfs	sched/headers: Prepare to remove <linux/cred.h> inclusion from <linux/sched.h>	2017-03-02 08:42:31 +01:00
openpromfs
orangefs	sched/wait: Disambiguate wq_entry->task_list and wq_head->task_list naming	2017-06-20 12:19:14 +02:00
overlayfs	UUID/GUID updates:	2017-07-03 09:55:26 -07:00
proc	fs/proc/task_mmu.c: remove obsolete comment in show_map_vma()	2017-07-10 16:32:32 -07:00
pstore	pstore: use memdup_user	2017-06-27 17:02:36 -07:00
qnx4
qnx6
quota	quota: add get_inode_usage callback to transfer multi-inode charges	2017-06-22 11:46:48 -04:00
ramfs
reiserfs	sched/wait: Rename wait_queue_t => wait_queue_entry_t	2017-06-20 12:18:27 +02:00
romfs	romfs: use different way to generate fsid for BLOCK or MTD	2017-01-24 16:26:14 -08:00
squashfs	fs/pstore: fs/squashfs: change usage of LZ4 to work with new LZ4 version	2017-02-24 17:46:57 -08:00
sysfs	sysfs: be careful of error returns from ops->show()	2017-04-08 17:33:32 +02:00
sysv	mm: drop "wait" parameter from write_one_page()	2017-07-05 18:44:22 -04:00
tracefs	fs: constify tree_descr arrays passed to simple_fill_super()	2017-04-26 23:54:06 -04:00
ubifs	This pull request contains updates for both UBI and UBIFS:	2017-05-13 10:23:12 -07:00
udf	udf: use kmap_atomic for memcpy copying	2017-04-24 16:28:02 +02:00
ufs	Writeback error handling fixes (pile #1)	2017-07-07 18:39:15 -07:00
xfs	Changes for 4.13:	2017-07-10 10:51:53 -07:00
aio.c	fs: add O_DIRECT and aio support for sending down write life time hints	2017-06-27 12:05:36 -06:00
anon_inodes.c
attr.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/signal.h>	2017-03-02 08:42:29 +01:00
bad_inode.c	statx: Add a system call to make enhanced file info available	2017-03-02 20:51:15 -05:00
binfmt_aout.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h>	2017-03-02 08:42:36 +01:00
binfmt_elf_fdpic.c	sched/headers: Prepare to move cputime functionality from <linux/sched.h> into <linux/sched/cputime.h>	2017-03-02 08:42:39 +01:00
binfmt_elf.c	sched/headers: Prepare to move cputime functionality from <linux/sched.h> into <linux/sched/cputime.h>	2017-03-02 08:42:39 +01:00
binfmt_em86.c
binfmt_flat.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h>	2017-03-02 08:42:36 +01:00
binfmt_misc.c	fs: constify tree_descr arrays passed to simple_fill_super()	2017-04-26 23:54:06 -04:00
binfmt_script.c
block_dev.c	Writeback error handling fixes (pile #2)	2017-07-07 19:38:17 -07:00
buffer.c	fs/buffer.c: make bh_lru_install() more efficient	2017-07-10 16:32:30 -07:00
char_dev.c	chardev: add helper function to register char devs with a struct device	2017-03-21 06:44:32 +01:00
compat_binfmt_elf.c	fs/binfmt: Convert obsolete cputime type to nsecs	2017-02-01 09:13:51 +01:00
compat_ioctl.c	Merge branch 'work.__copy_in_user' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-07-08 10:15:02 -07:00
compat.c	fs/compat.c: trim unused includes	2017-04-17 12:52:27 -04:00
coredump.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h>	2017-03-02 08:42:36 +01:00
dax.c	Writeback error handling fixes (pile #2)	2017-07-07 19:38:17 -07:00
dcache.c	fs/dcache.c: fix spin lockup issue on nlru->lock	2017-07-10 16:32:33 -07:00
dcookies.c
direct-io.c	fs: add O_DIRECT and aio support for sending down write life time hints	2017-06-27 12:05:36 -06:00
drop_caches.c
eventfd.c	There has been a fair amount of activity in the docs tree this time	2017-07-03 21:13:25 -07:00
eventpoll.c	sched/wait: Disambiguate wq_entry->task_list and wq_head->task_list naming	2017-06-20 12:19:14 +02:00
exec.c	exec: Limit arg stack to at most 75% of _STK_LIM	2017-07-07 20:05:08 -07:00
fcntl.c	vfs: fix flock compat thinko	2017-07-07 13:48:18 -07:00
fhandle.c	fhandle: move compat syscalls from compat.c	2017-04-17 12:52:26 -04:00
file_table.c	fs: new infrastructure for writeback error handling and reporting	2017-07-06 07:02:25 -04:00
file.c	fs/file.c: replace alloc_fdmem() with kvmalloc() alternative	2017-07-06 16:24:30 -07:00
filesystems.c	fs: warn in case userspace lied about modprobe return	2017-06-29 20:05:43 -04:00
fs_pin.c	sched/wait: Disambiguate wq_entry->task_list and wq_head->task_list naming	2017-06-20 12:19:14 +02:00
fs_struct.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task.h>	2017-03-02 08:42:35 +01:00
fs-writeback.c	fs: add a blank lines on some kernel-doc comments	2017-05-16 08:44:10 -03:00
inode.c	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-07-08 10:50:54 -07:00
internal.h	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-05-09 09:12:53 -07:00
ioctl.c	sched/headers: Prepare for the reduction of <linux/sched.h>'s signal API dependency	2017-03-02 08:42:37 +01:00
iomap.c	Changes for 4.13:	2017-07-10 10:51:53 -07:00
Kconfig	block, dax: move "select DAX" from BLOCK to FS_DAX	2017-05-08 10:55:27 -07:00
Kconfig.binfmt
libfs.c	fs: convert __generic_file_fsync to use errseq_t based reporting	2017-07-06 07:02:29 -04:00
locks.c	fs/locks: pass kernel struct flock to fcntl_getlk/setlk	2017-05-27 06:07:19 -04:00
Makefile
mbcache.c	ext4: xattr inode deduplication	2017-06-22 11:44:55 -04:00
mount.h	mnt: In propgate_umount handle visiting mounts in any order	2017-05-23 08:41:16 -05:00
mpage.c	There has been a fair amount of activity in the docs tree this time	2017-07-03 21:13:25 -07:00
namei.c	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-07-08 10:50:54 -07:00
namespace.c	mm: update callers to use HASH_ZERO flag	2017-07-06 16:24:33 -07:00
no-block.c
nsfs.c	ns: allow ns_entries to have custom symlink content	2017-05-08 17:15:12 -07:00
open.c	Writeback error handling fixes (pile #2)	2017-07-07 19:38:17 -07:00
pipe.c
pnode.c	mnt: Make propagate_umount less slow for overlapping mount propagation trees	2017-05-23 08:41:17 -05:00
pnode.h	mnt: Tuck mounts under others instead of creating shadow/side mounts.	2017-02-04 00:01:06 +13:00
posix_acl.c	sched/headers: Prepare to remove <linux/cred.h> inclusion from <linux/sched.h>	2017-03-02 08:42:31 +01:00
proc_namespace.c	sched/headers: Prepare to move the task_lock()/unlock() APIs to <linux/sched/task.h>	2017-03-02 08:42:38 +01:00
read_write.c	Merge branch 'work.read_write' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-07-07 21:48:15 -07:00
readdir.c	readdir: move compat syscalls from compat.c	2017-04-17 12:52:24 -04:00
select.c	Merge branch 'misc.compat' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-07-06 20:57:13 -07:00
seq_file.c	mm: introduce kv[mz]alloc helpers	2017-05-08 17:15:12 -07:00
signalfd.c	sched/wait: Rename wait_queue_t => wait_queue_entry_t	2017-06-20 12:18:27 +02:00
splice.c	fs: implement vfs_iter_write using do_iter_write	2017-06-29 17:49:23 -04:00
stack.c
stat.c	ufs: restore maintaining ->i_blocks	2017-06-09 16:28:01 -04:00
statfs.c	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2017-07-08 10:50:54 -07:00
super.c	bdi: Drop 'parent' argument from bdi_register[_va]()	2017-04-20 12:09:55 -06:00
sync.c	fs: remove call_fsync helper function	2017-07-05 18:44:23 -04:00
timerfd.c	timerfd: Use get_itimerspec64() and put_itimerspec64()	2017-06-30 04:14:38 -04:00
userfaultfd.c	mm/hugetlb: add size parameter to huge_pte_offset()	2017-07-06 16:24:34 -07:00
utimes.c	utimes: move compat syscalls from compat.c	2017-04-17 12:52:23 -04:00
xattr.c	treewide: use kv[mz]alloc* rather than opencoded variants	2017-05-08 17:15:13 -07:00