From: Jeff Layton Date: Wed, 23 Jul 2008 14:11:19 +0000 (-0400) Subject: lockdep: annotate cifs in-kernel sockets X-Git-Tag: v2.6.27-rc1~86^2~8 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=09e50d55a9490e9b7a6fdfbf8fc078924b25ecb5;p=pandora-kernel.git lockdep: annotate cifs in-kernel sockets Put CIFS sockets in their own class to avoid some lockdep warnings. CIFS sockets are not exposed to user-space, and so are not subject to the same deadlock scenarios. A similar change was made a couple of years ago for RPC sockets in commit ed07536ed6731775219c1df7fa26a7588753e693. This patch should prevent lockdep false-positives like this one: ======================================================= [ INFO: possible circular locking dependency detected ] 2.6.18-98.el5.jtltest.38.bz456320.1debug #1 ------------------------------------------------------- test5/2483 is trying to acquire lock: (sk_lock-AF_INET){--..}, at: [] tcp_sendmsg+0x1c/0xb2f but task is already holding lock: (&inode->i_alloc_sem){--..}, at: [] notify_change+0xf5/0x2e0 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&inode->i_alloc_sem){--..}: [] __lock_acquire+0x9a9/0xadf [] lock_acquire+0x55/0x70 [] notify_change+0xf5/0x2e0 [] down_write+0x3c/0x68 [] notify_change+0xf5/0x2e0 [] do_truncate+0x50/0x6b [] get_write_access+0x40/0x46 [] may_open+0x1d3/0x22e [] open_namei+0x2c6/0x6dd [] do_filp_open+0x1c/0x38 [] _spin_unlock+0x17/0x20 [] get_unused_fd+0xf9/0x107 [] do_sys_open+0x44/0xbe [] system_call+0x7e/0x83 [] 0xffffffffffffffff -> #2 (&sysfs_inode_imutex_key){--..}: [] __lock_acquire+0x9a9/0xadf [] create_dir+0x26/0x1d7 [] lock_acquire+0x55/0x70 [] create_dir+0x26/0x1d7 [] mutex_lock_nested+0x104/0x29c [] __lock_acquire+0x9ca/0xadf [] create_dir+0x26/0x1d7 [] sysfs_create_dir+0x58/0x76 [] kobject_add+0xdb/0x198 [] class_device_add+0xb2/0x465 [] kobject_get+0x12/0x17 [] register_netdevice+0x270/0x33e [] register_netdev+0x59/0x67 [] net_olddevs_init+0xb/0xac [] init+0x1f9/0x2fc [] _spin_unlock_irq+0x24/0x27 [] trace_hardirqs_on_thunk+0x35/0x37 [] child_rip+0xa/0x11 [] _spin_unlock_irq+0x24/0x27 [] restore_args+0x0/0x30 [] acpi_ds_init_one_object+0x0/0x80 [] init+0x0/0x2fc [] child_rip+0x0/0x11 [] 0xffffffffffffffff -> #1 (rtnl_mutex){--..}: [] __lock_acquire+0x9a9/0xadf [] ip_mc_leave_group+0x23/0xb7 [] lock_acquire+0x55/0x70 [] ip_mc_leave_group+0x23/0xb7 [] mutex_lock_nested+0x104/0x29c [] ip_mc_leave_group+0x23/0xb7 [] do_ip_setsockopt+0x6d1/0x9bf [] lock_release_holdtime+0x27/0x48 [] lock_release_holdtime+0x27/0x48 [] do_page_fault+0x503/0x835 [] socket_has_perm+0x5b/0x68 [] ip_setsockopt+0x22/0x78 [] sys_setsockopt+0x91/0xb7 [] tracesys+0xd5/0xdf [] 0xffffffffffffffff -> #0 (sk_lock-AF_INET){--..}: [] print_stack_trace+0x59/0x68 [] __lock_acquire+0x8bf/0xadf [] lock_acquire+0x55/0x70 [] tcp_sendmsg+0x1c/0xb2f [] lock_sock+0xd4/0xe4 [] _local_bh_enable+0xcb/0xe0 [] restore_args+0x0/0x30 [] tcp_sendmsg+0x1c/0xb2f [] sock_sendmsg+0xf3/0x110 [] autoremove_wake_function+0x0/0x2e [] kernel_text_address+0x1a/0x26 [] dump_trace+0x211/0x23a [] find_usage_backwards+0x5f/0x88 [] MD5Final+0xaf/0xc2 [cifs] [] cifs_calculate_signature+0x55/0x69 [cifs] [] kernel_sendmsg+0x35/0x47 [] smb_send+0xa3/0x151 [cifs] [] SendReceive+0x1a2/0x448 [cifs] [] __lock_acquire+0x95c/0xadf [] CIFSSMBSetEOF+0x20d/0x25b [cifs] [] cifs_set_file_size+0x110/0x3b7 [cifs] [] cifs_setattr+0x3b2/0x6f6 [cifs] [] notify_change+0xf5/0x2e0 [] notify_change+0x145/0x2e0 [] do_truncate+0x50/0x6b [] get_write_access+0x40/0x46 [] may_open+0x1d3/0x22e [] open_namei+0x2c6/0x6dd [] do_filp_open+0x1c/0x38 [] _spin_unlock+0x17/0x20 [] get_unused_fd+0xf9/0x107 [] do_sys_open+0x44/0xbe [] tracesys+0xd5/0xdf [] 0xffffffffffffffff other info that might help us debug this: 2 locks held by test5/2483: #0: (&inode->i_mutex){--..}, at: [] do_truncate+0x45/0x6b #1: (&inode->i_alloc_sem){--..}, at: [] notify_change+0xf5/0x2e0 stack backtrace: Call Trace: [] print_circular_bug_tail+0x65/0x6e [] print_stack_trace+0x59/0x68 [] __lock_acquire+0x8bf/0xadf [] lock_acquire+0x55/0x70 [] tcp_sendmsg+0x1c/0xb2f [] lock_sock+0xd4/0xe4 [] _local_bh_enable+0xcb/0xe0 [] restore_args+0x0/0x30 [] tcp_sendmsg+0x1c/0xb2f [] sock_sendmsg+0xf3/0x110 [] autoremove_wake_function+0x0/0x2e [] kernel_text_address+0x1a/0x26 [] dump_trace+0x211/0x23a [] find_usage_backwards+0x5f/0x88 [] :cifs:MD5Final+0xaf/0xc2 [] :cifs:cifs_calculate_signature+0x55/0x69 [] kernel_sendmsg+0x35/0x47 [] :cifs:smb_send+0xa3/0x151 [] :cifs:SendReceive+0x1a2/0x448 [] __lock_acquire+0x95c/0xadf [] :cifs:CIFSSMBSetEOF+0x20d/0x25b [] :cifs:cifs_set_file_size+0x110/0x3b7 [] :cifs:cifs_setattr+0x3b2/0x6f6 [] notify_change+0xf5/0x2e0 [] notify_change+0x145/0x2e0 [] do_truncate+0x50/0x6b [] get_write_access+0x40/0x46 [] may_open+0x1d3/0x22e [] open_namei+0x2c6/0x6dd [] do_filp_open+0x1c/0x38 [] _spin_unlock+0x17/0x20 [] get_unused_fd+0xf9/0x107 [] do_sys_open+0x44/0xbe [] tracesys+0xd5/0xdf Signed-off-by: Jeff Layton Acked-by: Peter Zijlstra Signed-off-by: Steve French --- Reading git-diff-tree failed