From mboxrd@z Thu Jan 1 00:00:00 1970 From: Laurent Riffard Subject: Reiser4: possible circular locking dependency detected Date: Tue, 17 Feb 2009 14:41:00 +0100 Message-ID: <499ABE6C.6010904@free.fr> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: Sender: reiserfs-devel-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="us-ascii" To: ReiserFS Mailing List Hello, I've got this warning in my logs with 2.6.29-rc5 + reiser4 patches: ======================================================= [ INFO: possible circular locking dependency detected ] 2.6.29-rc5-00012-g94aca52 #132 ------------------------------------------------------- git/5217 is trying to acquire lock: (&data->latch){----}, at: [] get_exclusive_access+0x12/0x1c [reiser4] but task is already holding lock: (&mm->mmap_sem){----}, at: [] sys_mmap2+0x44/0x7b which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&mm->mmap_sem){----}: [] __lock_acquire+0x98d/0xb00 [] lock_acquire+0x5b/0x81 [] might_fault+0x68/0x88 [] reiser4_read_tail+0x60/0xc2 [reiser4] [] read_unix_file+0x2da/0x3a0 [reiser4] [] reiser4_read_careful+0xac/0xf4 [reiser4] [] vfs_read+0x79/0xaa [] sys_read+0x3b/0x60 [] sysenter_do_call+0x12/0x43 [] 0xffffffff -> #0 (&data->latch){----}: [] __lock_acquire+0x862/0xb00 [] lock_acquire+0x5b/0x81 [] down_write+0x2a/0x46 [] get_exclusive_access+0x12/0x1c [reiser4] [] get_exclusive_access_careful+0x10/0x32 [reiser4] [] mmap_unix_file+0x48/0x10a [reiser4] [] reiser4_mmap_careful+0xa1/0xe6 [reiser4] [] mmap_region+0x219/0x3b0 [] do_mmap_pgoff+0x1e4/0x230 [] sys_mmap2+0x5a/0x7b [] sysenter_do_call+0x12/0x43 [] 0xffffffff other info that might help us debug this: 1 lock held by git/5217: #0: (&mm->mmap_sem){----}, at: [] sys_mmap2+0x44/0x7b stack backtrace: Pid: 5217, comm: git Not tainted 2.6.29-rc5-00012-g94aca52 #132 Call Trace: [] ? printk+0xf/0x17 [] print_circular_bug_tail+0x5d/0x68 [] __lock_acquire+0x862/0xb00 [] ? static_obj+0x6d/0x79 [] lock_acquire+0x5b/0x81 [] ? get_exclusive_access+0x12/0x1c [reiser4] [] down_write+0x2a/0x46 [] ? get_exclusive_access+0x12/0x1c [reiser4] [] get_exclusive_access+0x12/0x1c [reiser4] [] get_exclusive_access_careful+0x10/0x32 [reiser4] [] mmap_unix_file+0x48/0x10a [reiser4] [] reiser4_mmap_careful+0xa1/0xe6 [reiser4] [] mmap_region+0x219/0x3b0 [] do_mmap_pgoff+0x1e4/0x230 [] sys_mmap2+0x5a/0x7b [] sysenter_do_call+0x12/0x43 The set of reiser4 patches I'm using is available from http://laurent.riffard.free.fr/reiser4/reiser4-for-2.6.29-rc5/: 0001-Reiser4-for-Linux-2.6.28.patch 0002-reiser4-adjust-to-the-new-aops-fixup.patch 0003-Reiser4-fix-BUG-using-smp_processor_id-in-preemp.patch 0004-Reiser4-Change-current-fs-ug-id-to-current_fs-ug-i.patch 0005-Reiser4-fix-__grab_cache_page-usage.patch 0006-Revert-Reiser4-fix-__grab_cache_page-usage.patch 0007-Reiser4-build-fix.patch 0008-reiser4-update-names-of-quota-methods.patch ~~ laurent