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Date: Sun, 28 Jul 2013 19:55:01 +0200
From: Tilman Schmidt <tilman@...p.cc>
To: Linux Kernel <linux-kernel@...r.kernel.org>
Subject: [3.10] [nouveau] INFO: possible circular locking dependency detected
To whom it may concern.
With kernel 3.10.x I see this lockdep warning in my boot
log during the switch to nouveaufb:
<6>[ 23.243923] fbcon: nouveaufb (fb0) is primary device
<4>[ 23.245629]
<4>[ 23.245631] ======================================================
<4>[ 23.245632] [ INFO: possible circular locking dependency detected ]
<4>[ 23.245635] 3.10.3-capigig #1 Tainted: G W
<4>[ 23.245637] -------------------------------------------------------
<4>[ 23.245639] swapper/0/0 is trying to acquire lock:
<4>[ 23.245666] (&(&dev->vblank_time_lock)->rlock){-.....}, at: [<ffffffffa00b71c1>] drm_handle_vblank+0x3a/0x28f [drm]
<4>[ 23.245667]
<4>[ 23.245667] but task is already holding lock:
<4>[ 23.245710] (&(&event->lock)->rlock#2){-.....}, at: [<ffffffffa0128aa4>] nouveau_event_trigger+0x25/0xcb [nouveau]
<4>[ 23.245711]
<4>[ 23.245711] which lock already depends on the new lock.
<4>[ 23.245711]
<4>[ 23.245712]
<4>[ 23.245712] the existing dependency chain (in reverse order) is:
<4>[ 23.245716]
<4>[ 23.245716] -> #1 (&(&event->lock)->rlock#2){-.....}:
<4>[ 23.245724] [<ffffffff8107fa26>] lock_acquire+0x7e/0x94
<4>[ 23.245730] [<ffffffff8144694a>] _raw_spin_lock_irqsave+0x44/0x57
<4>[ 23.245758] [<ffffffffa0128a1a>] nouveau_event_get+0x1b/0x80 [nouveau]
<4>[ 23.245806] [<ffffffffa018842b>] nouveau_drm_vblank_enable+0xb3/0xbf [nouveau]
<4>[ 23.245819] [<ffffffffa00b782c>] drm_vblank_get+0x90/0x22c [drm]
<4>[ 23.245831] [<ffffffffa00b79fc>] drm_vblank_pre_modeset+0x34/0x49 [drm]
<4>[ 23.245881] [<ffffffffa019991c>] nv_crtc_prepare+0x48/0xdf [nouveau]
<4>[ 23.245888] [<ffffffffa010e9ce>] drm_crtc_helper_set_mode+0x25a/0x400 [drm_kms_helper]
<4>[ 23.245893] [<ffffffffa010f641>] drm_crtc_helper_set_config+0x6e7/0x976 [drm_kms_helper]
<4>[ 23.245909] [<ffffffffa00bed36>] drm_mode_set_config_internal+0x25/0x52 [drm]
<4>[ 23.245914] [<ffffffffa010dd72>] drm_fb_helper_set_par+0x59/0xa2 [drm_kms_helper]
<4>[ 23.245919] [<ffffffff8124085c>] fbcon_init+0x406/0x523
<4>[ 23.245923] [<ffffffff8128f7f1>] visual_init+0xba/0x111
<4>[ 23.245927] [<ffffffff81291191>] do_bind_con_driver+0x1c7/0x2de
<4>[ 23.245930] [<ffffffff8129132b>] do_take_over_console+0x38/0x45
<4>[ 23.245933] [<ffffffff8123fe35>] do_fbcon_takeover+0x57/0x91
<4>[ 23.245936] [<ffffffff8124119d>] fbcon_event_notify+0x4df/0x832
<4>[ 23.245940] [<ffffffff81057f3c>] notifier_call_chain+0x32/0x5e
<4>[ 23.245944] [<ffffffff810581b3>] __blocking_notifier_call_chain+0x46/0x5b
<4>[ 23.245947] [<ffffffff810581d7>] blocking_notifier_call_chain+0xf/0x11
<4>[ 23.245951] [<ffffffff81232f4e>] fb_notifier_call_chain+0x16/0x18
<4>[ 23.245955] [<ffffffff812340fb>] register_framebuffer+0x28b/0x2b7
<4>[ 23.245960] [<ffffffffa010dba0>] drm_fb_helper_initial_config+0x38c/0x44f [drm_kms_helper]
<4>[ 23.246010] [<ffffffffa01945f4>] nouveau_fbcon_init+0xe3/0xf3 [nouveau]
<4>[ 23.246057] [<ffffffffa0188c6e>] nouveau_drm_load+0x4a6/0x4ef [nouveau]
<4>[ 23.246071] [<ffffffffa00bbb7e>] drm_get_pci_dev+0x14f/0x25a [drm]
<4>[ 23.246117] [<ffffffffa01882cc>] nouveau_drm_probe+0x1d2/0x1f6 [nouveau]
<4>[ 23.246122] [<ffffffff81222f84>] local_pci_probe+0x39/0x61
<4>[ 23.246126] [<ffffffff81223f0d>] pci_device_probe+0xc8/0xf3
<4>[ 23.246130] [<ffffffff812acb19>] driver_probe_device+0x12a/0x2f9
<4>[ 23.246133] [<ffffffff812acd32>] __driver_attach+0x4a/0x6b
<4>[ 23.246137] [<ffffffff812ab0fc>] bus_for_each_dev+0x5c/0x89
<4>[ 23.246140] [<ffffffff812ac692>] driver_attach+0x19/0x1b
<4>[ 23.246143] [<ffffffff812ac110>] bus_add_driver+0xe4/0x21e
<4>[ 23.246146] [<ffffffff812ad241>] driver_register+0x8e/0x108
<4>[ 23.246149] [<ffffffff8122401c>] __pci_register_driver+0x5f/0x64
<4>[ 23.246163] [<ffffffffa00bbd13>] drm_pci_init+0x8a/0xef [drm]
<4>[ 23.246189] [<ffffffffa01f004d>] nouveau_drm_init+0x4d/0x1000 [nouveau]
<4>[ 23.246193] [<ffffffff81000283>] do_one_initcall+0x9b/0x130
<4>[ 23.246197] [<ffffffff8108a0d9>] load_module+0x1d83/0x20dd
<4>[ 23.246201] [<ffffffff8108a507>] SyS_init_module+0xd4/0xd6
<4>[ 23.246205] [<ffffffff81447d12>] system_call_fastpath+0x16/0x1b
<4>[ 23.246209]
<4>[ 23.246209] -> #0 (&(&dev->vblank_time_lock)->rlock){-.....}:
<4>[ 23.246212] [<ffffffff8107f29d>] __lock_acquire+0xc46/0xf61
<4>[ 23.246215] [<ffffffff8107fa26>] lock_acquire+0x7e/0x94
<4>[ 23.246218] [<ffffffff8144694a>] _raw_spin_lock_irqsave+0x44/0x57
<4>[ 23.246230] [<ffffffffa00b71c1>] drm_handle_vblank+0x3a/0x28f [drm]
<4>[ 23.246277] [<ffffffffa0188451>] nouveau_drm_vblank_handler+0x1a/0x21 [nouveau]
<4>[ 23.246305] [<ffffffffa0128ad1>] nouveau_event_trigger+0x52/0xcb [nouveau]
<4>[ 23.246345] [<ffffffffa014afa2>] nv04_disp_intr+0x50/0xa2 [nouveau]
<4>[ 23.246382] [<ffffffffa01406b2>] nouveau_mc_intr+0x5e/0xa6 [nouveau]
<4>[ 23.246386] [<ffffffff810ad00d>] handle_irq_event_percpu+0x29/0x128
<4>[ 23.246389] [<ffffffff810ad148>] handle_irq_event+0x3c/0x5c
<4>[ 23.246393] [<ffffffff810af849>] handle_fasteoi_irq+0x76/0xaa
<4>[ 23.246397] [<ffffffff81005413>] handle_irq+0x157/0x16a
<4>[ 23.246400] [<ffffffff81004fae>] do_IRQ+0x48/0x9f
<4>[ 23.246403] [<ffffffff8144746f>] ret_from_intr+0x0/0x13
<4>[ 23.246407] [<ffffffff8100b635>] arch_cpu_idle+0x13/0x1d
<4>[ 23.246410] [<ffffffff81073767>] cpu_startup_entry+0xec/0x149
<4>[ 23.246415] [<ffffffff814330ad>] rest_init+0xc1/0xc8
<4>[ 23.246419] [<ffffffff81ac7d4c>] start_kernel+0x3da/0x3e7
<4>[ 23.246423] [<ffffffff81ac748d>] x86_64_start_reservations+0x2a/0x2c
<4>[ 23.246426] [<ffffffff81ac7577>] x86_64_start_kernel+0xe8/0xef
<4>[ 23.246427]
<4>[ 23.246427] other info that might help us debug this:
<4>[ 23.246427]
<4>[ 23.246428] Possible unsafe locking scenario:
<4>[ 23.246428]
<4>[ 23.246429] CPU0 CPU1
<4>[ 23.246430] ---- ----
<4>[ 23.246433] lock(&(&event->lock)->rlock#2);
<4>[ 23.246436] lock(&(&dev->vblank_time_lock)->rlock);
<4>[ 23.246439] lock(&(&event->lock)->rlock#2);
<4>[ 23.246441] lock(&(&dev->vblank_time_lock)->rlock);
<4>[ 23.246442]
<4>[ 23.246442] *** DEADLOCK ***
<4>[ 23.246442]
<4>[ 23.246444] 1 lock held by swapper/0/0:
<4>[ 23.246475] #0: (&(&event->lock)->rlock#2){-.....}, at: [<ffffffffa0128aa4>] nouveau_event_trigger+0x25/0xcb [nouveau]
<4>[ 23.246476]
<4>[ 23.246476] stack backtrace:
<4>[ 23.246480] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W 3.10.3-capigig #1
<4>[ 23.246482] Hardware name: /DQ965GF, BIOS CO96510J.86A.5953.2007.0730.2059 07/30/2007
<4>[ 23.246488] ffffffff81d97690 ffff8801a7c03b28 ffffffff81444164 ffff8801a7c03b78
<4>[ 23.246492] ffffffff8107d878 ffffffff8107dc49 ffff8801a7c03bc8 ffffffff81a10b10
<4>[ 23.246496] ffffffff81a10400 ffffffff81a10b10 ffffffff81a10ae8 0000000000000001
<4>[ 23.246497] Call Trace:
<4>[ 23.246504] <IRQ> [<ffffffff81444164>] dump_stack+0x19/0x1d
<4>[ 23.246508] [<ffffffff8107d878>] print_circular_bug+0x1f8/0x209
<4>[ 23.246511] [<ffffffff8107dc49>] ? print_irq_inversion_bug+0x1d2/0x1d2
<4>[ 23.246515] [<ffffffff8107f29d>] __lock_acquire+0xc46/0xf61
<4>[ 23.246519] [<ffffffff8107fa26>] lock_acquire+0x7e/0x94
<4>[ 23.246532] [<ffffffffa00b71c1>] ? drm_handle_vblank+0x3a/0x28f [drm]
<4>[ 23.246536] [<ffffffff8144694a>] _raw_spin_lock_irqsave+0x44/0x57
<4>[ 23.246548] [<ffffffffa00b71c1>] ? drm_handle_vblank+0x3a/0x28f [drm]
<4>[ 23.246558] [<ffffffffa00b71c1>] drm_handle_vblank+0x3a/0x28f [drm]
<4>[ 23.246558] [<ffffffffa0128aa4>] ? nouveau_event_trigger+0x25/0xcb [nouveau]
<4>[ 23.246558] [<ffffffffa0188451>] nouveau_drm_vblank_handler+0x1a/0x21 [nouveau]
<4>[ 23.246558] [<ffffffffa0128ad1>] nouveau_event_trigger+0x52/0xcb [nouveau]
<4>[ 23.246558] [<ffffffffa014afa2>] nv04_disp_intr+0x50/0xa2 [nouveau]
<4>[ 23.246558] [<ffffffffa01406b2>] nouveau_mc_intr+0x5e/0xa6 [nouveau]
<4>[ 23.246558] [<ffffffff810ad00d>] handle_irq_event_percpu+0x29/0x128
<4>[ 23.246558] [<ffffffff810ad148>] handle_irq_event+0x3c/0x5c
<4>[ 23.246558] [<ffffffff81446859>] ? _raw_spin_lock+0x3e/0x45
<4>[ 23.246558] [<ffffffff810af7ec>] ? handle_fasteoi_irq+0x19/0xaa
<4>[ 23.246558] [<ffffffff810af849>] handle_fasteoi_irq+0x76/0xaa
<4>[ 23.246558] [<ffffffff81005413>] handle_irq+0x157/0x16a
<4>[ 23.246558] [<ffffffff8103ce47>] ? __local_bh_enable+0x9a/0x9e
<4>[ 23.246558] [<ffffffff81004fae>] do_IRQ+0x48/0x9f
<4>[ 23.246558] [<ffffffff8144746f>] common_interrupt+0x6f/0x6f
<4>[ 23.246558] <EOI> [<ffffffff81447520>] ? retint_restore_args+0xe/0xe
<4>[ 23.246558] [<ffffffff8100af27>] ? default_idle+0x10/0x17
<4>[ 23.246558] [<ffffffff8100af25>] ? default_idle+0xe/0x17
<4>[ 23.246558] [<ffffffff8100b635>] arch_cpu_idle+0x13/0x1d
<4>[ 23.246558] [<ffffffff81073767>] cpu_startup_entry+0xec/0x149
<4>[ 23.246558] [<ffffffff814330ad>] rest_init+0xc1/0xc8
<4>[ 23.246558] [<ffffffff8143302c>] ? rest_init+0x40/0xc8
<4>[ 23.246558] [<ffffffff81ac7d4c>] start_kernel+0x3da/0x3e7
<4>[ 23.246558] [<ffffffff81ac76e6>] ? repair_env_string+0x56/0x56
<4>[ 23.246558] [<ffffffff81ac748d>] x86_64_start_reservations+0x2a/0x2c
<4>[ 23.246558] [<ffffffff81ac7577>] x86_64_start_kernel+0xe8/0xef
<6>[ 23.256206] nouveau [ DRM] 0xD179: Parsing digital output script table
<6>[ 23.319086] nouveau [ DRM] 0xD1C2: Parsing digital output script table
<6>[ 23.369297] Console: switching to colour frame buffer device 160x64
<6>[ 23.479124] nouveau 0000:01:00.0: fb0: nouveaufb frame buffer device
<6>[ 23.480107] nouveau 0000:01:00.0: registered panic notifier
<6>[ 23.481097] [drm] Initialized nouveau 1.1.1 20120801 for 0000:01:00.0 on minor 0
The warning appears with kernels 3.10.3 and 3.10.1 but not 3.9.x.
The W taint flag seems to come from:
<4>[ 0.000000] WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing 64MB of RAM.
The machine is an Intel Pentium D on an Intel DQ965GF board
(ICH7 chipset) with an nVidia GeForce 6200TC PCIe card and
dual monitors, running a 64 bit kernel.
Everything is running fine so it appears to be a false positive.
--
Tilman Schmidt E-Mail: tilman@...p.cc
Bonn, Germany
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