| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <20070513205121.GA5814@martell.zuzino.mipt.ru>
Date: Mon, 14 May 2007 00:51:21 +0400
From: Alexey Dobriyan <adobriyan@...il.com>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, viro@...iv.linux.org.uk
Subject: 2.6.22-rc1: loop.c
On Sat, May 12, 2007 at 08:20:35PM -0700, Linus Torvalds wrote:
> Ok, the merge window has closed, and 2.6.22-rc1 is out there.
1. Should loop.c create max_loop or 8 devices for compatability?
I'm asking because quite a few people after upgrade will try
to find out where the hell is right place to create device
nodes like loop0 in distro of choice.
Offending line in my setup is
/portage /usr/portage auto loop,noatime 0 0
2. After (so far) manual invocations of mknod and mount -a, lockdep spit
the following:
=======================================================
[ INFO: possible circular locking dependency detected ]
2.6.22-rc1 #1
-------------------------------------------------------
mount/6168 is trying to acquire lock:
(block_subsys_lock){--..}, at: [<c0290b1d>] kobj_map+0x94/0xf3
but task is already holding lock:
(loop_devices_mutex){--..}, at: [<c0292364>] loop_lock+0xd/0x13
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (loop_devices_mutex){--..}:
[<c012566f>] add_lock_to_list+0x68/0x8d
[<c0126cbb>] debug_check_no_locks_freed+0x10a/0x127
[<c0127963>] __lock_acquire+0x993/0xafa
[<c0292364>] loop_lock+0xd/0x13
[<c0127e74>] lock_acquire+0x54/0x6b
[<c0292364>] loop_lock+0xd/0x13
[<c034c7fc>] __mutex_lock_slowpath+0xd9/0x254
[<c0292364>] loop_lock+0xd/0x13
[<c034c96f>] __mutex_lock_slowpath+0x24c/0x254
[<c02909ff>] kobj_lookup+0x34/0xbe
[<c0292364>] loop_lock+0xd/0x13
[<c0290a49>] kobj_lookup+0x7e/0xbe
[<c0293355>] loop_probe+0x0/0x12e
[<c0167ba0>] blkdev_open+0x0/0x4f
[<c0232a1e>] get_gendisk+0x11/0x1c
[<c01677d8>] do_open+0x2e/0x261
[<c0167ba0>] blkdev_open+0x0/0x4f
[<c034de80>] _spin_unlock+0x28/0x42
[<c0167ba0>] blkdev_open+0x0/0x4f
[<c0167bc7>] blkdev_open+0x27/0x4f
[<c0147c0e>] __dentry_open+0x9a/0x142
[<c0147d2c>] nameidata_to_filp+0x24/0x33
[<c0147d72>] do_filp_open+0x37/0x3e
[<c0147ae3>] get_unused_fd+0x1e/0xaf
[<c034de80>] _spin_unlock+0x28/0x42
[<c0147b6a>] get_unused_fd+0xa5/0xaf
[<c0147db5>] do_sys_open+0x3c/0x6f
[<c0147e23>] sys_open+0x1c/0x20
[<c01025c6>] sysenter_past_esp+0x5f/0x99
[<ffffffff>] 0xffffffff
-> #0 (block_subsys_lock){--..}:
[<c012784f>] __lock_acquire+0x87f/0xafa
[<c034df55>] _spin_unlock_irqrestore+0x37/0x5d
[<c0127e74>] lock_acquire+0x54/0x6b
[<c0290b1d>] kobj_map+0x94/0xf3
[<c034c7fc>] __mutex_lock_slowpath+0xd9/0x254
[<c0290b1d>] kobj_map+0x94/0xf3
[<c0126b8e>] trace_hardirqs_on+0x118/0x13b
[<c0126cbb>] debug_check_no_locks_freed+0x10a/0x127
[<c0290b1d>] kobj_map+0x94/0xf3
[<c0232a84>] blk_register_region+0x2f/0x34
[<c0232224>] exact_match+0x0/0x4
[<c0232954>] exact_lock+0x0/0x13
[<c0232ab8>] add_disk+0x2f/0x41
[<c0232224>] exact_match+0x0/0x4
[<c0232954>] exact_lock+0x0/0x13
[<c029342c>] loop_probe+0xd7/0x12e
[<c0290a64>] kobj_lookup+0x99/0xbe
[<c0293355>] loop_probe+0x0/0x12e
[<c0167ba0>] blkdev_open+0x0/0x4f
[<c0232a1e>] get_gendisk+0x11/0x1c
[<c01677d8>] do_open+0x2e/0x261
[<c0167ba0>] blkdev_open+0x0/0x4f
[<c034de80>] _spin_unlock+0x28/0x42
[<c0167ba0>] blkdev_open+0x0/0x4f
[<c0167bc7>] blkdev_open+0x27/0x4f
[<c0147c0e>] __dentry_open+0x9a/0x142
[<c0147d2c>] nameidata_to_filp+0x24/0x33
[<c0147d72>] do_filp_open+0x37/0x3e
[<c0147ae3>] get_unused_fd+0x1e/0xaf
[<c034de80>] _spin_unlock+0x28/0x42
[<c0147b6a>] get_unused_fd+0xa5/0xaf
[<c0147db5>] do_sys_open+0x3c/0x6f
[<c0147e23>] sys_open+0x1c/0x20
[<c01025c6>] sysenter_past_esp+0x5f/0x99
[<ffffffff>] 0xffffffff
other info that might help us debug this:
1 lock held by mount/6168:
#0: (loop_devices_mutex){--..}, at: [<c0292364>] loop_lock+0xd/0x13
stack backtrace:
[<c0126134>] print_circular_bug_tail+0x5e/0x66
[<c012784f>] __lock_acquire+0x87f/0xafa
[<c034df55>] _spin_unlock_irqrestore+0x37/0x5d
[<c0127e74>] lock_acquire+0x54/0x6b
[<c0290b1d>] kobj_map+0x94/0xf3
[<c034c7fc>] __mutex_lock_slowpath+0xd9/0x254
[<c0290b1d>] kobj_map+0x94/0xf3
[<c0126b8e>] trace_hardirqs_on+0x118/0x13b
[<c0126cbb>] debug_check_no_locks_freed+0x10a/0x127
[<c0290b1d>] kobj_map+0x94/0xf3
[<c0232a84>] blk_register_region+0x2f/0x34
[<c0232224>] exact_match+0x0/0x4
[<c0232954>] exact_lock+0x0/0x13
[<c0232ab8>] add_disk+0x2f/0x41
[<c0232224>] exact_match+0x0/0x4
[<c0232954>] exact_lock+0x0/0x13
[<c029342c>] loop_probe+0xd7/0x12e
[<c0290a64>] kobj_lookup+0x99/0xbe
[<c0293355>] loop_probe+0x0/0x12e
[<c0167ba0>] blkdev_open+0x0/0x4f
[<c0232a1e>] get_gendisk+0x11/0x1c
[<c01677d8>] do_open+0x2e/0x261
[<c0167ba0>] blkdev_open+0x0/0x4f
[<c034de80>] _spin_unlock+0x28/0x42
[<c0167ba0>] blkdev_open+0x0/0x4f
[<c0167bc7>] blkdev_open+0x27/0x4f
[<c0147c0e>] __dentry_open+0x9a/0x142
[<c0147d2c>] nameidata_to_filp+0x24/0x33
[<c0147d72>] do_filp_open+0x37/0x3e
[<c0147ae3>] get_unused_fd+0x1e/0xaf
[<c034de80>] _spin_unlock+0x28/0x42
[<c0147b6a>] get_unused_fd+0xa5/0xaf
[<c0147db5>] do_sys_open+0x3c/0x6f
[<c0147e23>] sys_open+0x1c/0x20
[<c01025c6>] sysenter_past_esp+0x5f/0x99
=======================
EXT2-fs warning: mounting unchecked fs, running e2fsck is recommended
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists