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WSL2-Linux-Kernel/fs/xfs/libxfs
История
Darrick J. Wong 6dcde60efd xfs: more lockdep whackamole with kmem_alloc* 
Dave Airlie reported the following lockdep complaint:

>  ======================================================
>  WARNING: possible circular locking dependency detected
>  5.7.0-0.rc5.20200515git1ae7efb38854.1.fc33.x86_64 #1 Not tainted
>  ------------------------------------------------------
>  kswapd0/159 is trying to acquire lock:
>  ffff9b38d01a4470 (&xfs_nondir_ilock_class){++++}-{3:3},
>  at: xfs_ilock+0xde/0x2c0 [xfs]
>
>  but task is already holding lock:
>  ffffffffbbb8bd00 (fs_reclaim){+.+.}-{0:0}, at:
>  __fs_reclaim_acquire+0x5/0x30
>
>  which lock already depends on the new lock.
>
>
>  the existing dependency chain (in reverse order) is:
>
>  -> #1 (fs_reclaim){+.+.}-{0:0}:
>         fs_reclaim_acquire+0x34/0x40
>         __kmalloc+0x4f/0x270
>         kmem_alloc+0x93/0x1d0 [xfs]
>         kmem_alloc_large+0x4c/0x130 [xfs]
>         xfs_attr_copy_value+0x74/0xa0 [xfs]
>         xfs_attr_get+0x9d/0xc0 [xfs]
>         xfs_get_acl+0xb6/0x200 [xfs]
>         get_acl+0x81/0x160
>         posix_acl_xattr_get+0x3f/0xd0
>         vfs_getxattr+0x148/0x170
>         getxattr+0xa7/0x240
>         path_getxattr+0x52/0x80
>         do_syscall_64+0x5c/0xa0
>         entry_SYSCALL_64_after_hwframe+0x49/0xb3
>
>  -> #0 (&xfs_nondir_ilock_class){++++}-{3:3}:
>         __lock_acquire+0x1257/0x20d0
>         lock_acquire+0xb0/0x310
>         down_write_nested+0x49/0x120
>         xfs_ilock+0xde/0x2c0 [xfs]
>         xfs_reclaim_inode+0x3f/0x400 [xfs]
>         xfs_reclaim_inodes_ag+0x20b/0x410 [xfs]
>         xfs_reclaim_inodes_nr+0x31/0x40 [xfs]
>         super_cache_scan+0x190/0x1e0
>         do_shrink_slab+0x184/0x420
>         shrink_slab+0x182/0x290
>         shrink_node+0x174/0x680
>         balance_pgdat+0x2d0/0x5f0
>         kswapd+0x21f/0x510
>         kthread+0x131/0x150
>         ret_from_fork+0x3a/0x50
>
>  other info that might help us debug this:
>
>   Possible unsafe locking scenario:
>
>         CPU0                    CPU1
>         ----                    ----
>    lock(fs_reclaim);
>                                 lock(&xfs_nondir_ilock_class);
>                                 lock(fs_reclaim);
>    lock(&xfs_nondir_ilock_class);
>
>   *** DEADLOCK ***
>
>  4 locks held by kswapd0/159:
>   #0: ffffffffbbb8bd00 (fs_reclaim){+.+.}-{0:0}, at:
>  __fs_reclaim_acquire+0x5/0x30
>   #1: ffffffffbbb7cef8 (shrinker_rwsem){++++}-{3:3}, at:
>  shrink_slab+0x115/0x290
>   #2: ffff9b39f07a50e8
>  (&type->s_umount_key#56){++++}-{3:3}, at: super_cache_scan+0x38/0x1e0
>   #3: ffff9b39f077f258
>  (&pag->pag_ici_reclaim_lock){+.+.}-{3:3}, at:
>  xfs_reclaim_inodes_ag+0x82/0x410 [xfs]

This is a known false positive because inodes cannot simultaneously be
getting reclaimed and the target of a getxattr operation, but lockdep
doesn't know that.  We can (selectively) shut up lockdep until either
it gets smarter or we change inode reclaim not to require the ILOCK by
applying a stupid GFP_NOLOCKDEP bandaid.

Reported-by: Dave Airlie <airlied@gmail.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Tested-by: Dave Airlie <airlied@gmail.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
 		2020-05-27 08:49:28 -07:00
..
xfs_ag.c xfs: remove XFS_BUF_TO_SBP 2020-03-11 09:11:39 -07:00
xfs_ag.h xfs: add a new ioctl to describe allocation group geometry 2019-04-14 18:15:57 -07:00
xfs_ag_resv.c xfs: fix missing header includes 2019-11-07 13:00:53 -08:00
xfs_ag_resv.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_alloc.c xfs: fix incorrect test in xfs_alloc_ag_vextent_lastblock 2020-03-17 07:32:46 -07:00
xfs_alloc.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_alloc_btree.c xfs: add support for free space btree staging cursors 2020-03-18 08:12:23 -07:00
xfs_alloc_btree.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_attr.c xfs: move the fork format fields into struct xfs_ifork 2020-05-19 09:40:58 -07:00
xfs_attr.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_attr_leaf.c xfs: more lockdep whackamole with kmem_alloc* 2020-05-27 08:49:28 -07:00
xfs_attr_leaf.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_attr_remote.c xfs: remove ATTR_KERNOVAL 2020-03-02 20:55:53 -08:00
xfs_attr_remote.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_attr_sf.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_bit.c xfs: fix missing header includes 2019-11-07 13:00:53 -08:00
xfs_bit.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_bmap.c xfs: force writes to delalloc regions to unwritten 2020-05-27 08:49:28 -07:00
xfs_bmap.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_bmap_btree.c xfs: move the fork format fields into struct xfs_ifork 2020-05-19 09:40:58 -07:00
xfs_bmap_btree.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_btree.c xfs: support bulk loading of staged btrees 2020-03-18 08:12:23 -07:00
xfs_btree.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_btree_staging.c xfs: support bulk loading of staged btrees 2020-03-18 08:12:23 -07:00
xfs_btree_staging.h xfs: support bulk loading of staged btrees 2020-03-18 08:12:23 -07:00
xfs_cksum.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xfs_da_btree.c xfs: xfs_dabuf_map should return ENOMEM when map allocation fails 2020-03-15 09:22:35 -07:00
xfs_da_btree.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_da_format.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_defer.c xfs: use ordered buffers to initialize dquot buffers during quotacheck 2020-05-19 09:40:56 -07:00
xfs_defer.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_dir2.c xfs: move the fork format fields into struct xfs_ifork 2020-05-19 09:40:58 -07:00
xfs_dir2.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_dir2_block.c xfs: move the per-fork nextents fields into struct xfs_ifork 2020-05-19 09:40:58 -07:00
xfs_dir2_data.c xfs: check owner of dir3 data blocks 2020-03-12 07:58:12 -07:00
xfs_dir2_leaf.c xfs: add a function to deal with corrupt buffers post-verifiers 2020-03-12 07:58:12 -07:00
xfs_dir2_node.c xfs: check owner of dir3 free blocks 2020-03-12 07:58:12 -07:00
xfs_dir2_priv.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_dir2_sf.c xfs: move the fork format fields into struct xfs_ifork 2020-05-19 09:40:58 -07:00
xfs_dquot_buf.c xfs: remove the xfs_disk_dquot_t and xfs_dquot_t 2019-11-13 11:13:45 -08:00
xfs_errortag.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_format.h xfs: remove the XFS_DFORK_Q macro 2020-05-19 09:40:58 -07:00
xfs_fs.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_health.h xfs: Use the correct style for SPDX License Identifier 2020-05-13 15:32:45 -07:00
xfs_ialloc.c xfs: only check the superblock version for dinode size calculation 2020-03-19 08:48:47 -07:00
xfs_ialloc.h xfs: don't commit sunit/swidth updates to disk if that would cause repair failures 2019-12-19 07:53:48 -08:00
xfs_ialloc_btree.c xfs: add support for inode btree staging cursors 2020-03-18 08:12:23 -07:00
xfs_ialloc_btree.h xfs: add support for inode btree staging cursors 2020-03-18 08:12:23 -07:00
xfs_iext_tree.c xfs: fix inode fork extent count overflow 2019-10-21 09:04:58 -07:00
xfs_inode_buf.c xfs: cleanup xfs_idestroy_fork 2020-05-19 09:40:59 -07:00
xfs_inode_buf.h xfs: move the fork format fields into struct xfs_ifork 2020-05-19 09:40:58 -07:00
xfs_inode_fork.c xfs: cleanup xfs_idestroy_fork 2020-05-19 09:40:59 -07:00
xfs_inode_fork.h xfs: cleanup xfs_idestroy_fork 2020-05-19 09:40:59 -07:00
xfs_log_format.h xfs: only check the superblock version for dinode size calculation 2020-03-19 08:48:47 -07:00
xfs_log_recover.h xfs: move log recovery buffer cancellation code to xfs_buf_item_recover.c 2020-05-08 08:50:01 -07:00
xfs_log_rlimit.c xfs: remove unused header files 2019-06-28 19:30:43 -07:00
xfs_quota_defs.h xfs: always return -ENOSPC on project quota reservation failure 2020-05-27 08:49:25 -07:00
xfs_refcount.c xfs: make the btree ag cursor private union anonymous 2020-03-13 10:37:15 -07:00
xfs_refcount.h xfs: remove unnecessary int returns from deferred refcount functions 2019-08-28 08:31:02 -07:00
xfs_refcount_btree.c xfs: add support for refcount btree staging cursors 2020-03-18 08:12:23 -07:00
xfs_refcount_btree.h xfs: add support for refcount btree staging cursors 2020-03-18 08:12:23 -07:00
xfs_rmap.c xfs: convert btree cursor ag-private member name 2020-03-13 10:37:14 -07:00
xfs_rmap.h xfs: reinitialize rm_flags when unpacking an offset into an rmap irec 2019-08-28 08:31:02 -07:00
xfs_rmap_btree.c xfs: add support for rmap btree staging cursors 2020-03-18 08:12:23 -07:00
xfs_rmap_btree.h xfs: add support for rmap btree staging cursors 2020-03-18 08:12:23 -07:00
xfs_rtbitmap.c xfs: xfs_bmapi_read doesn't take a fork id as the last argument 2020-05-19 09:40:57 -07:00
xfs_sb.c xfs: fix the warning message in xfs_validate_sb_common() 2020-05-19 09:40:56 -07:00
xfs_sb.h xfs: change some error-less functions to void types 2019-05-01 20:26:30 -07:00
xfs_shared.h xfs: remove all *_ITER_CONTINUE values 2019-08-30 22:43:56 -07:00
xfs_symlink_remote.c xfs: move the fork format fields into struct xfs_ifork 2020-05-19 09:40:58 -07:00
xfs_trans_inode.c xfs: remove the xfs_inode_log_item_t typedef 2020-05-04 09:03:16 -07:00
xfs_trans_resv.c xfs: add a new xfs_sb_version_has_v3inode helper 2020-03-19 08:47:34 -07:00
xfs_trans_resv.h xfs: convert to SPDX license tags 2018-06-06 14:17:53 -07:00
xfs_trans_space.h xfs: separate inode geometry 2019-06-12 08:37:40 -07:00
xfs_types.c xfs: remove unused header files 2019-06-28 19:30:43 -07:00
xfs_types.h xfs: remove unused structure members & simple typedefs 2019-11-13 18:22:41 -08:00