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Subject[BUG?] [Nouveau] INFO: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected
I am seeing the following in kernel log messages every time I reboot.
I am running 2.6.37-rc2.
(commit 589136bfa784a4558b397f017ca2f06f0ca9080e).

Please let me know if you need more info or want me to test any
patches.

[ 1043.994049] ======================================================
[ 1043.995596] [ INFO: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected ]
[ 1043.996203] 2.6.37-rc2-ab3-589136bfa784a4558b397f017ca2f06f0ca9080e+ #2
[ 1043.996817] ------------------------------------------------------
[ 1043.997432] Xorg/2097 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
[ 1043.998038] (&(&dev_priv->ramin_lock)->rlock){+.+...}, at: [<f0887014>] nouveau_gpuobj_del+0xb8/0xe2 [nouveau]
[ 1043.998658]
[ 1043.998658] and this task is already holding:
[ 1043.999891] (&(&ramht->lock)->rlock){-.....}, at: [<f089fe4f>] nouveau_ramht_remove+0x23/0x3e [nouveau]
[ 1043.999906] which would create a new lock dependency:
[ 1043.999907] (&(&ramht->lock)->rlock){-.....} -> (&(&dev_priv->ramin_lock)->rlock){+.+...}
[ 1043.999913]
[ 1043.999913] but this new dependency connects a HARDIRQ-irq-safe lock:
[ 1043.999914] (&(&ramht->lock)->rlock){-.....}
[ 1043.999916] ... which became HARDIRQ-irq-safe at:
[ 1043.999917] [<c0472027>] __lock_acquire+0x27a/0xc06
[ 1043.999921] [<c0472e10>] lock_acquire+0xbc/0xdc
[ 1043.999923] [<c0824efb>] _raw_spin_lock_irqsave+0x48/0x78
[ 1043.999927] [<f089fe93>] nouveau_ramht_find+0x29/0x6d [nouveau]
[ 1043.999941] [<f0888e74>] nouveau_irq_handler+0x16a/0x17aa [nouveau]
[ 1043.999953] [<c049da82>] handle_IRQ_event+0x51/0x10f
[ 1043.999956] [<c049f7bb>] handle_fasteoi_irq+0x95/0xcc
[ 1043.999959]
[ 1043.999960] to a HARDIRQ-irq-unsafe lock:
[ 1043.999961] (&(&dev_priv->ramin_lock)->rlock){+.+...}
[ 1043.999962] ... which became HARDIRQ-irq-unsafe at:
[ 1043.999963] ... [<c047209b>] __lock_acquire+0x2ee/0xc06
[ 1043.999966] [<c0472e10>] lock_acquire+0xbc/0xdc
[ 1043.999968] [<c0824d98>] _raw_spin_lock+0x3b/0x68
[ 1043.999970] [<f0887167>] nouveau_gpuobj_new+0x129/0x39b [nouveau]
[ 1043.999981] [<f08b583f>] nv50_instmem_init+0x11a/0x7db [nouveau]
[ 1043.999996] [<f088371c>] nouveau_card_init+0xeda/0x1214 [nouveau]
[ 1044.000007] [<f0884158>] nouveau_load+0x6e7/0x73e [nouveau]
[ 1044.000017] [<ef819b8f>] drm_get_pci_dev+0x165/0x257 [drm]
[ 1044.000029] [<f08c5c12>] nouveau_pci_probe+0x12/0x14 [nouveau]
[ 1044.000043] [<c060c794>] local_pci_probe+0x34/0x5f
[ 1044.000046] [<c060cc70>] pci_device_probe+0x4d/0x70
[ 1044.000048] [<c06b1a9a>] driver_probe_device+0x119/0x1e9
[ 1044.000052] [<c06b1bae>] __driver_attach+0x44/0x60
[ 1044.000053] [<c06b0c44>] bus_for_each_dev+0x42/0x65
[ 1044.000055] [<c06b1707>] driver_attach+0x1e/0x20
[ 1044.000057] [<c06b1369>] bus_add_driver+0xc0/0x218
[ 1044.000059] [<c06b1d9d>] driver_register+0x84/0xe3
[ 1044.000061] [<c060ce6d>] __pci_register_driver+0x51/0xae
[ 1044.000063] [<ef819f11>] drm_pci_init+0x37/0x96 [drm]
[ 1044.000074] [<ef8135ae>] drm_init+0x5c/0x5e [drm]
[ 1044.000083] [<f08e4042>] 0xf08e4042
[ 1044.000086] [<c0403192>] do_one_initcall+0x8c/0x146
[ 1044.000088] [<c047c610>] sys_init_module+0x12e9/0x1486
[ 1044.000091] [<c040971f>] sysenter_do_call+0x12/0x38
[ 1044.000094]
[ 1044.000095] other info that might help us debug this:
[ 1044.000096]
[ 1044.000097] 2 locks held by Xorg/2097:
[ 1044.000098] #0: (drm_global_mutex){+.+.+.}, at: [<ef8138f8>] drm_ioctl+0x2f1/0x3c5 [drm]
[ 1044.000107] #1: (&(&ramht->lock)->rlock){-.....}, at: [<f089fe4f>] nouveau_ramht_remove+0x23/0x3e [nouveau]
[ 1044.000123]
[ 1044.000123] the dependencies between HARDIRQ-irq-safe lock and the holding lock:
[ 1044.000147] -> (&(&ramht->lock)->rlock){-.....} ops: 61 {
[ 1044.000149] IN-HARDIRQ-W at:
[ 1044.000150] [<c0472027>] __lock_acquire+0x27a/0xc06
[ 1044.000154] [<c0472e10>] lock_acquire+0xbc/0xdc
[ 1044.000156] [<c0824efb>] _raw_spin_lock_irqsave+0x48/0x78
[ 1044.000159] [<f089fe93>] nouveau_ramht_find+0x29/0x6d [nouveau]
[ 1044.000173] [<f0888e74>] nouveau_irq_handler+0x16a/0x17aa [nouveau]
[ 1044.000186] [<c049da82>] handle_IRQ_event+0x51/0x10f
[ 1044.000189] [<c049f7bb>] handle_fasteoi_irq+0x95/0xcc
[ 1044.000192] INITIAL USE at:
[ 1044.000193] [<c047210f>] __lock_acquire+0x362/0xc06
[ 1044.000196] [<c0472e10>] lock_acquire+0xbc/0xdc
[ 1044.000199] [<c0824efb>] _raw_spin_lock_irqsave+0x48/0x78
[ 1044.000201] [<f089fe93>] nouveau_ramht_find+0x29/0x6d [nouveau]
[ 1044.000216] [<f089ff10>] nouveau_ramht_insert+0x39/0x2dd [nouveau]
[ 1044.000230] [<f08b9b84>] nv50_evo_dmaobj_new.clone.4+0xe7/0xfd [nouveau]
[ 1044.000246] [<f08babd8>] nv50_display_create+0x289/0x5bd [nouveau]
[ 1044.000262] [<f08837bd>] nouveau_card_init+0xf7b/0x1214 [nouveau]
[ 1044.000273] [<f0884158>] nouveau_load+0x6e7/0x73e [nouveau]
[ 1044.000284] [<ef819b8f>] drm_get_pci_dev+0x165/0x257 [drm]
[ 1044.000295] [<f08c5c12>] nouveau_pci_probe+0x12/0x14 [nouveau]
[ 1044.000308] [<c060c794>] local_pci_probe+0x34/0x5f
[ 1044.000311] [<c060cc70>] pci_device_probe+0x4d/0x70
[ 1044.000313] [<c06b1a9a>] driver_probe_device+0x119/0x1e9
[ 1044.000315] [<c06b1bae>] __driver_attach+0x44/0x60
[ 1044.000318] [<c06b0c44>] bus_for_each_dev+0x42/0x65
[ 1044.000320] [<c06b1707>] driver_attach+0x1e/0x20
[ 1044.000323] [<c06b1369>] bus_add_driver+0xc0/0x218
[ 1044.000325] [<c06b1d9d>] driver_register+0x84/0xe3
[ 1044.000327] [<c060ce6d>] __pci_register_driver+0x51/0xae
[ 1044.000329] [<ef819f11>] drm_pci_init+0x37/0x96 [drm]
[ 1044.000341] [<ef8135ae>] drm_init+0x5c/0x5e [drm]
[ 1044.000351] [<f08e4042>] 0xf08e4042
[ 1044.000354] [<c0403192>] do_one_initcall+0x8c/0x146
[ 1044.000356] [<c047c610>] sys_init_module+0x12e9/0x1486
[ 1044.000360] [<c040971f>] sysenter_do_call+0x12/0x38
[ 1044.000362] }
[ 1044.000363] ... key at: [<f08d6c60>] __key.34354+0x0/0xfffeefd6 [nouveau]
[ 1044.000373] ... acquired at:
[ 1044.000374] [<c0471975>] check_irq_usage+0x40/0x86
[ 1044.000376] [<c047274c>] __lock_acquire+0x99f/0xc06
[ 1044.000379] [<c0472e10>] lock_acquire+0xbc/0xdc
[ 1044.000381] [<c0824d98>] _raw_spin_lock+0x3b/0x68
[ 1044.000382] [<f0887014>] nouveau_gpuobj_del+0xb8/0xe2 [nouveau]
[ 1044.000393] [<c05f2f2d>] kref_put+0x39/0x42
[ 1044.000396] [<f088683b>] nouveau_gpuobj_ref+0x2d/0x33 [nouveau]
[ 1044.000407] [<f089fc4f>] nouveau_ramht_remove_locked+0x50/0x1d7 [nouveau]
[ 1044.000422] [<f089fe5b>] nouveau_ramht_remove+0x2f/0x3e [nouveau]
[ 1044.000436] [<f0886aab>] nouveau_ioctl_gpuobj_free+0x89/0x93 [nouveau]
[ 1044.000447] [<ef81390c>] drm_ioctl+0x305/0x3c5 [drm]
[ 1044.000456] [<c050af42>] do_vfs_ioctl+0x591/0x5c2
[ 1044.000459] [<c050afbb>] sys_ioctl+0x48/0x69
[ 1044.000461] [<c040971f>] sysenter_do_call+0x12/0x38
[ 1044.000463]
[ 1044.000464]
[ 1044.000464] the dependencies between the lock to be acquired and HARDIRQ-irq-unsafe lock:
[ 1044.000486] -> (&(&dev_priv->ramin_lock)->rlock){+.+...} ops: 20682 {
[ 1044.000489] HARDIRQ-ON-W at:
[ 1044.000490] [<c047209b>] __lock_acquire+0x2ee/0xc06
[ 1044.000492] [<c0472e10>] lock_acquire+0xbc/0xdc
[ 1044.000495] [<c0824d98>] _raw_spin_lock+0x3b/0x68
[ 1044.000498] [<f0887167>] nouveau_gpuobj_new+0x129/0x39b [nouveau]
[ 1044.000509] [<f08b583f>] nv50_instmem_init+0x11a/0x7db [nouveau]
[ 1044.000524] [<f088371c>] nouveau_card_init+0xeda/0x1214 [nouveau]
[ 1044.000536] [<f0884158>] nouveau_load+0x6e7/0x73e [nouveau]
[ 1044.000546] [<ef819b8f>] drm_get_pci_dev+0x165/0x257 [drm]
[ 1044.000557] [<f08c5c12>] nouveau_pci_probe+0x12/0x14 [nouveau]
[ 1044.000571] [<c060c794>] local_pci_probe+0x34/0x5f
[ 1044.000574] [<c060cc70>] pci_device_probe+0x4d/0x70
[ 1044.000577] [<c06b1a9a>] driver_probe_device+0x119/0x1e9
[ 1044.000579] [<c06b1bae>] __driver_attach+0x44/0x60
[ 1044.000581] [<c06b0c44>] bus_for_each_dev+0x42/0x65
[ 1044.000585] [<c06b1707>] driver_attach+0x1e/0x20
[ 1044.000587] [<c06b1369>] bus_add_driver+0xc0/0x218
[ 1044.000589] [<c06b1d9d>] driver_register+0x84/0xe3
[ 1044.000591] [<c060ce6d>] __pci_register_driver+0x51/0xae
[ 1044.000595] [<ef819f11>] drm_pci_init+0x37/0x96 [drm]
[ 1044.000606] [<ef8135ae>] drm_init+0x5c/0x5e [drm]
[ 1044.000615] [<f08e4042>] 0xf08e4042
[ 1044.000617] [<c0403192>] do_one_initcall+0x8c/0x146
[ 1044.000621] [<c047c610>] sys_init_module+0x12e9/0x1486
[ 1044.000624] [<c040971f>] sysenter_do_call+0x12/0x38
[ 1044.000626] SOFTIRQ-ON-W at:
[ 1044.000627] [<c04720ba>] __lock_acquire+0x30d/0xc06
[ 1044.000630] [<c0472e10>] lock_acquire+0xbc/0xdc
[ 1044.000633] [<c0824d98>] _raw_spin_lock+0x3b/0x68
[ 1044.000636] [<f0887167>] nouveau_gpuobj_new+0x129/0x39b [nouveau]
[ 1044.000646] [<f08b583f>] nv50_instmem_init+0x11a/0x7db [nouveau]
[ 1044.000662] [<f088371c>] nouveau_card_init+0xeda/0x1214 [nouveau]
[ 1044.000672] [<f0884158>] nouveau_load+0x6e7/0x73e [nouveau]
[ 1044.000682] [<ef819b8f>] drm_get_pci_dev+0x165/0x257 [drm]
[ 1044.000693] [<f08c5c12>] nouveau_pci_probe+0x12/0x14 [nouveau]
[ 1044.000707] [<c060c794>] local_pci_probe+0x34/0x5f
[ 1044.000710] [<c060cc70>] pci_device_probe+0x4d/0x70
[ 1044.000712] [<c06b1a9a>] driver_probe_device+0x119/0x1e9
[ 1044.000715] [<c06b1bae>] __driver_attach+0x44/0x60
[ 1044.000717] [<c06b0c44>] bus_for_each_dev+0x42/0x65
[ 1044.000720] [<c06b1707>] driver_attach+0x1e/0x20
[ 1044.000722] [<c06b1369>] bus_add_driver+0xc0/0x218
[ 1044.000724] [<c06b1d9d>] driver_register+0x84/0xe3
[ 1044.000726] [<c060ce6d>] __pci_register_driver+0x51/0xae
[ 1044.000729] [<ef819f11>] drm_pci_init+0x37/0x96 [drm]
[ 1044.000740] [<ef8135ae>] drm_init+0x5c/0x5e [drm]
[ 1044.000750] [<f08e4042>] 0xf08e4042
[ 1044.000755] [<c0403192>] do_one_initcall+0x8c/0x146
[ 1044.000760] [<c047c610>] sys_init_module+0x12e9/0x1486
[ 1044.000762] [<c040971f>] sysenter_do_call+0x12/0x38
[ 1044.000765] INITIAL USE at:
[ 1044.000766] [<c047210f>] __lock_acquire+0x362/0xc06
[ 1044.000769] [<c0472e10>] lock_acquire+0xbc/0xdc
[ 1044.000772] [<c0824d98>] _raw_spin_lock+0x3b/0x68
[ 1044.000775] [<f0887167>] nouveau_gpuobj_new+0x129/0x39b [nouveau]
[ 1044.000786] [<f08b583f>] nv50_instmem_init+0x11a/0x7db [nouveau]
[ 1044.000801] [<f088371c>] nouveau_card_init+0xeda/0x1214 [nouveau]
[ 1044.000811] [<f0884158>] nouveau_load+0x6e7/0x73e [nouveau]
[ 1044.000821] [<ef819b8f>] drm_get_pci_dev+0x165/0x257 [drm]
[ 1044.000832] [<f08c5c12>] nouveau_pci_probe+0x12/0x14 [nouveau]
[ 1044.000845] [<c060c794>] local_pci_probe+0x34/0x5f
[ 1044.000848] [<c060cc70>] pci_device_probe+0x4d/0x70
[ 1044.000851] [<c06b1a9a>] driver_probe_device+0x119/0x1e9
[ 1044.000854] [<c06b1bae>] __driver_attach+0x44/0x60
[ 1044.000856] [<c06b0c44>] bus_for_each_dev+0x42/0x65
[ 1044.000858] [<c06b1707>] driver_attach+0x1e/0x20
[ 1044.000861] [<c06b1369>] bus_add_driver+0xc0/0x218
[ 1044.000864] [<c06b1d9d>] driver_register+0x84/0xe3
[ 1044.000866] [<c060ce6d>] __pci_register_driver+0x51/0xae
[ 1044.000868] [<ef819f11>] drm_pci_init+0x37/0x96 [drm]
[ 1044.000879] [<ef8135ae>] drm_init+0x5c/0x5e [drm]
[ 1044.000887] [<f08e4042>] 0xf08e4042
[ 1044.000891] [<c0403192>] do_one_initcall+0x8c/0x146
[ 1044.000893] [<c047c610>] sys_init_module+0x12e9/0x1486
[ 1044.000896] [<c040971f>] sysenter_do_call+0x12/0x38
[ 1044.000899] }
[ 1044.000900] ... key at: [<f08d6c2c>] __key.34274+0x0/0xfffef00a [nouveau]
[ 1044.000910] ... acquired at:
[ 1044.000911] [<c0471975>] check_irq_usage+0x40/0x86
[ 1044.000914] [<c047274c>] __lock_acquire+0x99f/0xc06
[ 1044.000916] [<c0472e10>] lock_acquire+0xbc/0xdc
[ 1044.000918] [<c0824d98>] _raw_spin_lock+0x3b/0x68
[ 1044.000920] [<f0887014>] nouveau_gpuobj_del+0xb8/0xe2 [nouveau]
[ 1044.000930] [<c05f2f2d>] kref_put+0x39/0x42
[ 1044.000932] [<f088683b>] nouveau_gpuobj_ref+0x2d/0x33 [nouveau]
[ 1044.000942] [<f089fc4f>] nouveau_ramht_remove_locked+0x50/0x1d7 [nouveau]
[ 1044.000956] [<f089fe5b>] nouveau_ramht_remove+0x2f/0x3e [nouveau]
[ 1044.000970] [<f0886aab>] nouveau_ioctl_gpuobj_free+0x89/0x93 [nouveau]
[ 1044.000980] [<ef81390c>] drm_ioctl+0x305/0x3c5 [drm]
[ 1044.000988] [<c050af42>] do_vfs_ioctl+0x591/0x5c2
[ 1044.000991] [<c050afbb>] sys_ioctl+0x48/0x69
[ 1044.000993] [<c040971f>] sysenter_do_call+0x12/0x38
[ 1044.000995]
[ 1044.000995]
[ 1044.000996] stack backtrace:
[ 1044.000998] Pid: 2097, comm: Xorg Not tainted 2.6.37-rc2-ab3-589136bfa784a4558b397f017ca2f06f0ca9080e+ #2
[ 1044.000999] Call Trace:
[ 1044.001002] [<c0822e61>] ? printk+0x2d/0x34
[ 1044.001005] [<c0471928>] check_usage+0x2d9/0x2e6
[ 1044.001007] [<c0471c18>] ? mark_lock+0x26/0x1bb
[ 1044.001011] [<c040ea48>] ? sched_clock+0x8/0xb
[ 1044.001013] [<c0471975>] check_irq_usage+0x40/0x86
[ 1044.001016] [<c047274c>] __lock_acquire+0x99f/0xc06
[ 1044.001018] [<c046ff1f>] ? register_lock_class+0x17/0x2a1
[ 1044.001030] [<f0887014>] ? nouveau_gpuobj_del+0xb8/0xe2 [nouveau]
[ 1044.001032] [<c0472e10>] lock_acquire+0xbc/0xdc
[ 1044.001043] [<f0887014>] ? nouveau_gpuobj_del+0xb8/0xe2 [nouveau]
[ 1044.001046] [<c0824d98>] _raw_spin_lock+0x3b/0x68
[ 1044.001057] [<f0887014>] ? nouveau_gpuobj_del+0xb8/0xe2 [nouveau]
[ 1044.001068] [<f0887014>] nouveau_gpuobj_del+0xb8/0xe2 [nouveau]
[ 1044.001071] [<c04653da>] ? local_clock+0x32/0x49
[ 1044.001082] [<f0886f5c>] ? nouveau_gpuobj_del+0x0/0xe2 [nouveau]
[ 1044.001084] [<c05f2f2d>] kref_put+0x39/0x42
[ 1044.001095] [<f088683b>] nouveau_gpuobj_ref+0x2d/0x33 [nouveau]
[ 1044.001110] [<f089fc4f>] nouveau_ramht_remove_locked+0x50/0x1d7 [nouveau]
[ 1044.001125] [<f089fe5b>] nouveau_ramht_remove+0x2f/0x3e [nouveau]
[ 1044.001136] [<f0886aab>] nouveau_ioctl_gpuobj_free+0x89/0x93 [nouveau]
[ 1044.001139] [<c0824018>] ? mutex_lock_nested+0x3b/0x40
[ 1044.001149] [<ef81390c>] drm_ioctl+0x305/0x3c5 [drm]
[ 1044.001162] [<f0886a22>] ? nouveau_ioctl_gpuobj_free+0x0/0x93 [nouveau]
[ 1044.001166] [<c040ea3b>] ? native_sched_clock+0x4d/0x52
[ 1044.001168] [<c040ea48>] ? sched_clock+0x8/0xb
[ 1044.001170] [<c046529d>] ? sched_clock_cpu+0x42/0x14d
[ 1044.001173] [<c0824dbe>] ? _raw_spin_lock+0x61/0x68
[ 1044.001175] [<c046fc0e>] ? trace_hardirqs_off+0xb/0xd
[ 1044.001177] [<c04653da>] ? local_clock+0x32/0x49
[ 1044.001180] [<c046fe3e>] ? lock_release_holdtime+0x30/0xb5
[ 1044.001189] [<ef813607>] ? drm_ioctl+0x0/0x3c5 [drm]
[ 1044.001191] [<c050af42>] do_vfs_ioctl+0x591/0x5c2
[ 1044.001195] [<c0463e8d>] ? up_read+0x22/0x25
[ 1044.001198] [<c082864c>] ? do_page_fault+0x330/0x36e
[ 1044.001200] [<c046fde7>] ? lock_is_held+0x70/0x78
[ 1044.001202] [<c04ff199>] ? fcheck_files+0xab/0xdc
[ 1044.001204] [<c04ff815>] ? fget_light+0x2f/0x6d
[ 1044.001206] [<c050afbb>] sys_ioctl+0x48/0x69
[ 1044.001209] [<c040971f>] sysenter_do_call+0x12/0x38
[ 1044.001822] [drm] nouveau 0000:08:00.0: nouveau_channel_free: freeing fifo 2

-Arun


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