On Mon, Mar 23, 2015 at 11:33:42AM -0400, Josh Boyer wrote:
I have a machine that no longer boots in a headless manner with -rc5. It's an Celeron based NUC device. I blacklisted the i915 driver and it boots fine, then I ran insmod manually and got the backtrace below. This machine only has HDMI output on it. If I have it connected (even if the monitor is set to display some other input) it will boot fine, but the backtrace is still present. I'm going to guess the machine "hangs" in headless because X causes some further issues in the headless case.
Linux v4.0-rc4-199-gb314acaccd7e gets this splat in the headless state:
[ +0.000039] WARNING: CPU: 0 PID: 63 at drivers/gpu/drm/i915/i915_gem.c:4525 i915_gem_free_object+0x2e5/0x320 [i915]() [ +0.000002] WARN_ON(obj->frontbuffer_bits)
which is what I thought one of these commits was supposed to fix. I don't see that in -rc5, but then we have these other issues.
[ +0.000037] WARNING: CPU: 1 PID: 1486 at include/linux/kref.h:47 drm_framebuffer_reference+0x7a/0x90 [drm]()
..
[ +0.000037] WARNING: CPU: 0 PID: 563 at drivers/gpu/drm/drm_atomic.c:482 drm_atomic_check_only+0x33d/0x500 [drm]()
I've started seeing this one too as of rc5. Along with..
============================================================================= BUG kmalloc-192 (Tainted: G W ): Poison overwritten ----------------------------------------------------------------------------- Disabling lock debugging due to kernel taint INFO: 0xffff8804277e5c78-0xffff8804277e5c78. First byte 0x6a instead of 0x6b INFO: Allocated in ironlake_get_initial_plane_config+0x86/0x390 [i915] age=175 cpu=5 pid=313 __slab_alloc.constprop.79+0x5a9/0x670 kmem_cache_alloc_trace+0x21f/0x300 ironlake_get_initial_plane_config+0x86/0x390 [i915] intel_modeset_init+0x9d9/0x1a50 [i915] i915_driver_load+0xebf/0x1150 [i915] drm_dev_register+0xb5/0x110 [drm] drm_get_pci_dev+0x8d/0x200 [drm] i915_pci_probe+0x3b/0x60 [i915] pci_device_probe+0x8c/0xf0 driver_probe_device+0x90/0x3e0 __driver_attach+0xa3/0xb0 bus_for_each_dev+0x73/0xc0 driver_attach+0x1e/0x20 bus_add_driver+0x188/0x260 driver_register+0x64/0xf0 __pci_register_driver+0x64/0x70 INFO: Freed in intel_user_framebuffer_destroy+0x65/0xa0 [i915] age=40 cpu=0 pid=128 __slab_free+0x19e/0x2c0 kfree+0x2c1/0x310 intel_user_framebuffer_destroy+0x65/0xa0 [i915] drm_framebuffer_free+0x50/0x60 [drm] drm_framebuffer_unreference+0x35/0x70 [drm] drm_atomic_helper_plane_destroy_state+0x1f/0x30 [drm_kms_helper] intel_plane_destroy_state+0xe/0x10 [i915] drm_plane_helper_commit+0xb2/0x2e0 [drm_kms_helper] drm_plane_helper_update+0x9a/0xf0 [drm_kms_helper] __intel_set_mode+0x8b5/0xb70 [i915] intel_crtc_set_config+0xc4b/0x1030 [i915] drm_mode_set_config_internal+0x69/0x120 [drm] restore_fbdev_mode+0xc8/0xf0 [drm_kms_helper] drm_fb_helper_restore_fbdev_mode_unlocked+0x29/0x80 [drm_kms_helper] drm_fb_helper_set_par+0x22/0x50 [drm_kms_helper] intel_fbdev_set_par+0x1a/0x60 [i915] INFO: Slab 0xffffea00109df900 objects=31 used=31 fp=0x (null) flags=0x8000000000004080 INFO: Object 0xffff8804277e5c70 @offset=7280 fp=0xffff8804277e6288 Bytes b4 ffff8804277e5c60: 54 7a fb ff 00 00 00 00 5a 5a 5a 5a 5a 5a 5a 5a Tz......ZZZZZZZZ Object ffff8804277e5c70: 6b 6b 6b 6b 6b 6b 6b 6b 6a 6b 6b 6b 6b 6b 6b 6b kkkkkkkkjkkkkkkk Object ffff8804277e5c80: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8804277e5c90: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8804277e5ca0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8804277e5cb0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8804277e5cc0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8804277e5cd0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8804277e5ce0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8804277e5cf0: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8804277e5d00: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8804277e5d10: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b kkkkkkkkkkkkkkkk Object ffff8804277e5d20: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b a5 kkkkkkkkkkkkkkk. Redzone ffff8804277e5d30: bb bb bb bb bb bb bb bb ........ Padding ffff8804277e5e70: 5a 5a 5a 5a 5a 5a 5a 5a ZZZZZZZZ CPU: 4 PID: 128 Comm: kworker/u16:4 Tainted: G B W 4.0.0-rc5-backupdebug+ #1 Workqueue: events_unbound async_run_entry_fn ffff8804277e5c70 000000002ebc2945 ffff8800b780f578 ffffffff90780cc3 0000000000000000 ffff88042b804900 ffff8800b780f5b8 ffffffff901e76cc 0000000000000008 ffff880400000001 ffff8804277e5c79 ffff88042b804900 Call Trace: [<ffffffff90780cc3>] dump_stack+0x4c/0x65 [<ffffffff901e76cc>] print_trailer+0x14c/0x200 [<ffffffff901e784f>] check_bytes_and_report+0xcf/0x110 [<ffffffff901e8717>] check_object+0x1d7/0x250 [<ffffffffc0335cac>] ? intel_plane_duplicate_state+0x2c/0xa0 [i915] [<ffffffff901e8c14>] alloc_debug_processing+0xa4/0x1a0 [<ffffffff901eb5c9>] __slab_alloc.constprop.79+0x5a9/0x670 [<ffffffffc0335cac>] ? intel_plane_duplicate_state+0x2c/0xa0 [i915] [<ffffffffc0335cac>] ? intel_plane_duplicate_state+0x2c/0xa0 [i915] [<ffffffff901edc0e>] __kmalloc_track_caller+0x2ee/0x380 [<ffffffff901b2e40>] kmemdup+0x20/0x50 [<ffffffffc0335cac>] intel_plane_duplicate_state+0x2c/0xa0 [i915] [<ffffffffc0239be8>] drm_atomic_get_plane_state+0x78/0xf0 [drm] [<ffffffffc028d428>] drm_atomic_helper_plane_set_property+0x68/0xd0 [drm_kms_helper] [<ffffffffc022824d>] drm_mode_plane_set_obj_prop+0x2d/0x90 [drm] [<ffffffffc028ee4b>] restore_fbdev_mode+0x6b/0xf0 [drm_kms_helper] [<ffffffffc0290f09>] drm_fb_helper_restore_fbdev_mode_unlocked+0x29/0x80 [drm_kms_helper] [<ffffffffc0290f82>] drm_fb_helper_set_par+0x22/0x50 [drm_kms_helper] [<ffffffffc0290e91>] drm_fb_helper_hotplug_event+0x91/0xe0 [drm_kms_helper] [<ffffffffc0290f2c>] drm_fb_helper_restore_fbdev_mode_unlocked+0x4c/0x80 [drm_kms_helper] [<ffffffffc0290f82>] drm_fb_helper_set_par+0x22/0x50 [drm_kms_helper] [<ffffffffc03313ba>] intel_fbdev_set_par+0x1a/0x60 [i915] [<ffffffff9047e488>] fbcon_init+0x588/0x610 [<ffffffff90500f4c>] visual_init+0xbc/0x120 [<ffffffff9050376e>] do_bind_con_driver+0x17e/0x3b0 [<ffffffff90503ef4>] do_take_over_console+0xb4/0x1e0 [<ffffffff90479283>] do_fbcon_takeover+0x63/0xd0 [<ffffffff9047efbd>] fbcon_event_notify+0x6cd/0x7d0 [<ffffffff9009d0e2>] notifier_call_chain+0x62/0x100 [<ffffffff9009d391>] __blocking_notifier_call_chain+0x51/0x70 [<ffffffff9009d3c6>] blocking_notifier_call_chain+0x16/0x20 [<ffffffff90484f1b>] fb_notifier_call_chain+0x1b/0x20 [<ffffffff90487267>] register_framebuffer+0x207/0x340 [<ffffffffc0291214>] drm_fb_helper_initial_config+0x264/0x3c0 [drm_kms_helper] [<ffffffffc03326db>] intel_fbdev_initial_config+0x1b/0x20 [i915] [<ffffffff9009f69a>] async_run_entry_fn+0x4a/0x150 [<ffffffff90095819>] process_one_work+0x209/0x810 [<ffffffff90095780>] ? process_one_work+0x170/0x810 [<ffffffff90095e8b>] worker_thread+0x6b/0x490 [<ffffffff90095e20>] ? process_one_work+0x810/0x810 [<ffffffff9009ba79>] kthread+0x119/0x130 [<ffffffff9009b960>] ? kthread_create_on_node+0x240/0x240 [<ffffffff90789888>] ret_from_fork+0x58/0x90 [<ffffffff9009b960>] ? kthread_create_on_node+0x240/0x240 FIX kmalloc-192: Restoring 0xffff8804277e5c78-0xffff8804277e5c78=0x6b FIX kmalloc-192: Marking all objects used