From: "Theodore Ts'o" <tytso@mit.edu>
To: Tahsin Erdogan <tahsin@google.com>
Cc: Andreas Dilger <adilger@dilger.ca>,
"Darrick J . Wong" <darrick.wong@oracle.com>,
Jan Kara <jack@suse.cz>,
linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 04/32] ext4: do not set posix acls on xattr inodes
Date: Wed, 21 Jun 2017 21:23:37 -0400 [thread overview]
Message-ID: <20170622012337.pemajnble5pvyhst@thunk.org> (raw)
In-Reply-To: <20170621212142.16581-4-tahsin@google.com>
On Wed, Jun 21, 2017 at 02:21:14PM -0700, Tahsin Erdogan wrote:
> We don't need acls on xattr inodes because they are not directly
> accessible from user mode.
>
> Besides lockdep complains about recursive locking of xattr_sem as seen
> below.
>
> =============================================
> [ INFO: possible recursive locking detected ]
> 4.11.0-rc8+ #402 Not tainted
> ---------------------------------------------
> python/1894 is trying to acquire lock:
> (&ei->xattr_sem){++++..}, at: [<ffffffff804878a6>] ext4_xattr_get+0x66/0x270
>
> but task is already holding lock:
> (&ei->xattr_sem){++++..}, at: [<ffffffff80489500>] ext4_xattr_set_handle+0xa0/0x5d0
>
> other info that might help us debug this:
> Possible unsafe locking scenario:
>
> CPU0
> ----
> lock(&ei->xattr_sem);
> lock(&ei->xattr_sem);
>
> *** DEADLOCK ***
>
> May be due to missing lock nesting notation
>
> 3 locks held by python/1894:
> #0: (sb_writers#10){.+.+.+}, at: [<ffffffff803d829f>] mnt_want_write+0x1f/0x50
> #1: (&sb->s_type->i_mutex_key#15){+.+...}, at: [<ffffffff803dda27>] vfs_setxattr+0x57/0xb0
> #2: (&ei->xattr_sem){++++..}, at: [<ffffffff80489500>] ext4_xattr_set_handle+0xa0/0x5d0
>
> stack backtrace:
> CPU: 0 PID: 1894 Comm: python Not tainted 4.11.0-rc8+ #402
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
> Call Trace:
> dump_stack+0x67/0x99
> __lock_acquire+0x5f3/0x1830
> lock_acquire+0xb5/0x1d0
> down_read+0x2f/0x60
> ext4_xattr_get+0x66/0x270
> ext4_get_acl+0x43/0x1e0
> get_acl+0x72/0xf0
> posix_acl_create+0x5e/0x170
> ext4_init_acl+0x21/0xc0
> __ext4_new_inode+0xffd/0x16b0
> ext4_xattr_set_entry+0x5ea/0xb70
> ext4_xattr_block_set+0x1b5/0x970
> ext4_xattr_set_handle+0x351/0x5d0
> ext4_xattr_set+0x124/0x180
> ext4_xattr_user_set+0x34/0x40
> __vfs_setxattr+0x66/0x80
> __vfs_setxattr_noperm+0x69/0x1c0
> vfs_setxattr+0xa2/0xb0
> setxattr+0x129/0x160
> path_setxattr+0x87/0xb0
> SyS_setxattr+0xf/0x20
> entry_SYSCALL_64_fastpath+0x18/0xad
>
> Signed-off-by: Tahsin Erdogan <tahsin@google.com>
Thanks, added to the ext4 patch queue.
- Ted
next prev parent reply other threads:[~2017-06-22 1:23 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-21 21:21 [PATCH 01/32] ext4: xattr-in-inode support Tahsin Erdogan
2017-06-21 21:21 ` [PATCH 02/32] ext4: fix lockdep warning about recursive inode locking Tahsin Erdogan
2017-06-22 1:18 ` Theodore Ts'o
2017-06-21 21:21 ` [PATCH 03/32] ext4: lock inode before calling ext4_orphan_add() Tahsin Erdogan
2017-06-22 1:20 ` Theodore Ts'o
2017-06-21 21:21 ` [PATCH 04/32] ext4: do not set posix acls on xattr inodes Tahsin Erdogan
2017-06-22 1:23 ` Theodore Ts'o [this message]
2017-06-21 21:21 ` [PATCH 05/32] ext4: attach jinode after creation of xattr inode Tahsin Erdogan
2017-06-22 1:26 ` Theodore Ts'o
2017-06-21 21:21 ` [PATCH 06/32] ext4: ea_inode owner should be the same as the inode owner Tahsin Erdogan
2017-06-22 1:28 ` Theodore Ts'o
2017-06-21 21:21 ` [PATCH 07/32] ext4: call journal revoke when freeing ea_inode blocks Tahsin Erdogan
2017-06-22 1:38 ` Theodore Ts'o
2017-06-21 21:21 ` [PATCH 08/32] ext4: fix ref counting for ea_inode Tahsin Erdogan
2017-06-22 1:40 ` Theodore Ts'o
2017-06-21 21:21 ` [PATCH 09/32] ext4: extended attribute value size limit is enforced by vfs Tahsin Erdogan
2017-06-22 1:42 ` Theodore Ts'o
2017-06-22 18:02 ` Darrick J. Wong
2017-06-22 19:40 ` Andreas Dilger
2017-06-22 22:27 ` Theodore Ts'o
2017-06-22 23:21 ` Darrick J. Wong
2017-06-21 21:21 ` [PATCH 10/32] ext4: change ext4_xattr_inode_iget() signature Tahsin Erdogan
2017-06-22 1:55 ` Theodore Ts'o
2017-06-21 21:21 ` [PATCH 11/32] ext4: clean up ext4_xattr_inode_get() Tahsin Erdogan
2017-06-22 1:58 ` Theodore Ts'o
2017-06-21 21:21 ` [PATCH 12/32] ext4: add missing le32_to_cpu(e_value_inum) conversions Tahsin Erdogan
2017-06-22 2:00 ` Theodore Ts'o
2017-06-21 21:21 ` [PATCH 13/32] ext4: ext4_xattr_value_same() should return false for external data Tahsin Erdogan
2017-06-22 2:04 ` Theodore Ts'o
2017-06-21 21:21 ` [PATCH 14/32] ext4: fix ext4_xattr_make_inode_space() value size calculation Tahsin Erdogan
2017-06-22 2:09 ` Theodore Ts'o
2017-06-21 21:21 ` [PATCH 15/32] ext4: fix ext4_xattr_move_to_block() Tahsin Erdogan
2017-06-22 2:13 ` Theodore Ts'o
2017-06-21 21:21 ` [PATCH 16/32] ext4: fix ext4_xattr_cmp() Tahsin Erdogan
2017-06-22 2:15 ` Theodore Ts'o
2017-06-21 21:21 ` [PATCH 17/32] ext4: fix credits calculation for xattr inode Tahsin Erdogan
2017-06-22 2:19 ` Theodore Ts'o
2017-06-21 21:21 ` [PATCH 18/32] ext4: retry storing value in external inode with xattr block too Tahsin Erdogan
2017-06-22 2:22 ` Theodore Ts'o
2017-06-21 21:21 ` [PATCH 19/32] ext4: ext4_xattr_delete_inode() should return accurate errors Tahsin Erdogan
2017-06-22 2:27 ` Theodore Ts'o
2017-06-21 21:21 ` [PATCH 20/32] ext4: improve journal credit handling in set xattr paths Tahsin Erdogan
2017-06-22 2:30 ` Theodore Ts'o
2017-06-21 21:21 ` [PATCH 21/32] ext4: modify ext4_xattr_ino_array to hold struct inode * Tahsin Erdogan
2017-06-22 14:28 ` Theodore Ts'o
2017-06-21 21:21 ` [PATCH 22/32] ext4: move struct ext4_xattr_inode_array to xattr.h Tahsin Erdogan
2017-06-22 14:29 ` Theodore Ts'o
2017-06-21 21:21 ` [PATCH 23/32] mbcache: make mbcache naming more generic Tahsin Erdogan
2017-06-22 14:37 ` Theodore Ts'o
2017-06-21 21:21 ` [PATCH 24/32] ext2, ext4: make mb block cache names more explicit Tahsin Erdogan
2017-06-21 21:21 ` [PATCH 25/32] ext4: add ext4_is_quota_file() Tahsin Erdogan
2017-06-21 21:21 ` [PATCH 26/32] ext4: cleanup transaction restarts during inode deletion Tahsin Erdogan
2017-06-21 21:21 ` [PATCH 27/32] ext4: xattr inode deduplication Tahsin Erdogan
2017-06-21 21:21 ` [PATCH 28/32] quota: add get_inode_usage callback to transfer multi-inode charges Tahsin Erdogan
2017-06-21 21:21 ` [PATCH 29/32] ext4: reserve space for xattr entries/names Tahsin Erdogan
2017-06-21 21:21 ` [PATCH 30/32] ext4: eliminate xattr entry e_hash recalculation for removes Tahsin Erdogan
2017-06-21 21:21 ` [PATCH 31/32] ext4: strong binding of xattr inode references Tahsin Erdogan
2017-06-21 21:21 ` [PATCH 32/32] ext4: add nombcache mount option Tahsin Erdogan
2017-06-22 1:16 ` [PATCH 01/32] ext4: xattr-in-inode support Theodore Ts'o
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