Re: [drm-misc:drm-misc-next] [drm/ttm] 1802537820: WARNING:at_drivers/gpu/drm/drm_gem_vram_helper.c:#drm_gem_vram_offset

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Hey guys,

I'm pretty sure this is a bug in bochs which happens to surface because of a recent TTM change, we have seen similar problems in the past with this driver.

What happens is that userspace tries to bind a BO to a CRTC before the BO has even a backing store.

Any idea how to fix this? I can just remove the warning, but that's not really a good solution.

Regards,
Christian.

Am 08.02.23 um 05:32 schrieb kernel test robot:
Greeting,

FYI, we noticed WARNING:at_drivers/gpu/drm/drm_gem_vram_helper.c:#drm_gem_vram_offset due to commit (built with gcc-11):

commit: 1802537820389183dfcd814e0f6a60d1496a75ef ("drm/ttm: stop allocating dummy resources during BO creation")
git://anongit.freedesktop.org/drm/drm-misc drm-misc-next

in testcase: boot

on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G

caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):


If you fix the issue, kindly add following tag
| Reported-by: kernel test robot <oliver.sang@xxxxxxxxx>
| Link: https://lore.kernel.org/oe-lkp/202302081038.984b8c1-oliver.sang@xxxxxxxxx


[   25.994992][    T1] ------------[ cut here ]------------
[ 25.995050][ T1] WARNING: CPU: 0 PID: 1 at drivers/gpu/drm/drm_gem_vram_helper.c:255 drm_gem_vram_offset (??:?)
[   25.995080][    T1] Modules linked in:
[   25.995100][    T1] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G                T  6.2.0-rc6-01191-g180253782038 #1 a8db67375c3ac749313dafaec43f39836e38fae9
[   25.995117][    T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-debian-1.16.0-5 04/01/2014
[ 25.995128][ T1] RIP: 0010:drm_gem_vram_offset (??:?)
[ 25.995144][ T1] Code: 02 00 00 b8 ff ff 37 00 48 89 fa 48 c1 e0 2a 48 c1 ea 03 80 3c 02 00 74 05 e8 7f 1f eb fe 48 8b 9b 20 02 00 00 48 85 db 75 06 <0f> 0b 31 c0 eb 4b 48 8d 7b 10 b8 ff ff 37 00 48 89 fa 48 c1 e0 2a
All code
========
    0:	02 00                	add    (%rax),%al
    2:	00 b8 ff ff 37 00    	add    %bh,0x37ffff(%rax)
    8:	48 89 fa             	mov    %rdi,%rdx
    b:	48 c1 e0 2a          	shl    $0x2a,%rax
    f:	48 c1 ea 03          	shr    $0x3,%rdx
   13:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   17:	74 05                	je     0x1e
   19:	e8 7f 1f eb fe       	callq  0xfffffffffeeb1f9d
   1e:	48 8b 9b 20 02 00 00 	mov    0x220(%rbx),%rbx
   25:	48 85 db             	test   %rbx,%rbx
   28:	75 06                	jne    0x30
   2a:*	0f 0b                	ud2    		<-- trapping instruction
   2c:	31 c0                	xor    %eax,%eax
   2e:	eb 4b                	jmp    0x7b
   30:	48 8d 7b 10          	lea    0x10(%rbx),%rdi
   34:	b8 ff ff 37 00       	mov    $0x37ffff,%eax
   39:	48 89 fa             	mov    %rdi,%rdx
   3c:	48 c1 e0 2a          	shl    $0x2a,%rax

Code starting with the faulting instruction
===========================================
    0:	0f 0b                	ud2
    2:	31 c0                	xor    %eax,%eax
    4:	eb 4b                	jmp    0x51
    6:	48 8d 7b 10          	lea    0x10(%rbx),%rdi
    a:	b8 ff ff 37 00       	mov    $0x37ffff,%eax
    f:	48 89 fa             	mov    %rdi,%rdx
   12:	48 c1 e0 2a          	shl    $0x2a,%rax
[   25.995156][    T1] RSP: 0000:ffffc9000001f028 EFLAGS: 00210246
[   25.995174][    T1] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   25.995186][    T1] RDX: 1ffff11026dee544 RSI: ffff8881372d4b10 RDI: ffff888136f72a20
[   25.995196][    T1] RBP: ffffc9000001f030 R08: 0000000000000000 R09: 0000000000000000
[   25.995206][    T1] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881372d4b00
[   25.995215][    T1] R13: ffff888136e9ee00 R14: ffff888136f4a060 R15: 0000000000000500
[   25.995225][    T1] FS:  0000000000000000(0000) GS:ffff8883aee00000(0000) knlGS:0000000000000000
[   25.995236][    T1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   25.995247][    T1] CR2: 00000000f7fa1cd4 CR3: 0000000006015000 CR4: 00000000000406b0
[   25.995262][    T1] Call Trace:
[   25.995271][    T1]  <TASK>
[ 25.995287][ T1] bochs_plane_update (bochs.c:?)
[ 25.995308][ T1] ? rcu_read_lock_bh_held (??:?)
[ 25.995337][ T1] ? bochs_pci_probe (bochs.c:?)
[ 25.995352][ T1] ? srcu_read_unlock (blk-mq.c:?)
[ 25.995396][ T1] bochs_pipe_enable (bochs.c:?)
[ 25.995410][ T1] ? drm_dev_printk (??:?)
[ 25.995435][ T1] ? bochs_pipe_update (bochs.c:?)
[ 25.995454][ T1] ? bochs_plane_update (bochs.c:?)
[ 25.995473][ T1] ? bochs_pipe_update (bochs.c:?)
[ 25.995487][ T1] ? bochs_pipe_update (bochs.c:?)
[ 25.995507][ T1] drm_simple_kms_crtc_enable (drm_simple_kms_helper.c:?)
[ 25.995533][ T1] drm_atomic_helper_commit_modeset_enables (??:?)
[ 25.995570][ T1] drm_atomic_helper_commit_tail (??:?)
[ 25.995591][ T1] commit_tail (drm_atomic_helper.c:?)
[ 25.995631][ T1] drm_atomic_helper_commit (??:?)
[ 25.995652][ T1] ? commit_work (??:?)
[ 25.995670][ T1] drm_atomic_commit (??:?)
[ 25.995689][ T1] ? drm_atomic_nonblocking_commit (??:?)
[ 25.995703][ T1] ? __drm_atomic_helper_set_config (??:?)
[ 25.995716][ T1] ? malformed_message+0xe0/0xe0
[ 25.995741][ T1] ? update_output_state (??:?)
[ 25.995757][ T1] ? malformed_message+0xe0/0xe0
[ 25.995804][ T1] drm_client_modeset_commit_atomic (drm_client_modeset.c:?)
[ 25.995836][ T1] ? kmalloc_array (core.c:?)
[ 25.995894][ T1] ? mutex_trylock (mutex.c:?)
[ 25.995910][ T1] ? mark_lock+0x67/0x227
[ 25.995951][ T1] ? drm_fb_helper_lastclose (??:?)
[ 25.995966][ T1] drm_client_modeset_commit_locked (??:?)
[ 25.995988][ T1] drm_client_modeset_commit (??:?)
[ 25.996008][ T1] __drm_fb_helper_restore_fbdev_mode_unlocked (drm_fb_helper.c:?)
[ 25.996032][ T1] drm_fb_helper_set_par (??:?)
[ 25.996054][ T1] set_con2fb_map (fbcon.c:?)
[ 25.996090][ T1] do_fb_registered (fbcon.c:?)
[ 25.996119][ T1] fbcon_fb_registered (??:?)
[ 25.996138][ T1] do_register_framebuffer (fbmem.c:?)
[ 25.996158][ T1] ? get_fb_info+0xaa/0xaa
[ 25.996218][ T1] register_framebuffer (??:?)
[ 25.996241][ T1] __drm_fb_helper_initial_config_and_unlock (drm_fb_helper.c:?)
[ 25.996268][ T1] ? __drm_fb_helper_find_sizes (drm_fb_helper.c:?)
[ 25.996321][ T1] drm_fb_helper_initial_config (??:?)
[ 25.996341][ T1] drm_fbdev_client_hotplug (drm_fbdev_generic.c:?)
[ 25.996363][ T1] drm_fbdev_generic_setup (??:?)
[ 25.996389][ T1] bochs_pci_probe (bochs.c:?)
[ 25.996413][ T1] ? bochs_hw_init (bochs.c:?)
[ 25.996429][ T1] ? trace_hardirqs_on (??:?)
[ 25.996456][ T1] ? bochs_hw_init (bochs.c:?)
[ 25.996477][ T1] local_pci_probe (pci-driver.c:?)
[ 25.996507][ T1] pci_call_probe (pci-driver.c:?)
[ 25.996520][ T1] ? rcu_read_lock_bh_held (??:?)
[ 25.996543][ T1] ? local_pci_probe (pci-driver.c:?)
[ 25.996563][ T1] ? __kasan_check_read (??:?)
[ 25.996830][ T1] ? pci_match_id (??:?)
[ 25.996854][ T1] ? pci_match_device (pci-driver.c:?)
[ 25.996882][ T1] pci_device_probe (pci-driver.c:?)
[ 25.996904][ T1] really_probe (dd.c:?)
[ 25.996933][ T1] __driver_probe_device (dd.c:?)
[ 25.996955][ T1] ? __device_attach_driver (dd.c:?)
[ 25.996970][ T1] driver_probe_device (dd.c:?)
[ 25.996992][ T1] __driver_attach (dd.c:?)
[ 25.997014][ T1] ? __device_attach_driver (dd.c:?)
[ 25.997030][ T1] bus_for_each_dev (??:?)
[ 25.997050][ T1] ? next_device (core.c:?)
[ 25.997069][ T1] ? do_raw_spin_unlock (??:?)
[ 25.997107][ T1] driver_attach (??:?)
[ 25.997127][ T1] bus_add_driver (??:?)
[ 25.997158][ T1] driver_register (??:?)
[ 25.997182][ T1] __pci_register_driver (??:?)
[ 25.997202][ T1] ? etnaviv_init (bochs.c:?)
[ 25.997221][ T1] bochs_pci_driver_init (bochs.c:?)
[ 25.997240][ T1] do_one_initcall (??:?)
[ 25.997260][ T1] ? rcu_lock_acquire (??:?)
[ 25.997277][ T1] ? lock_is_held (signal.c:?)
[ 25.997293][ T1] ? rcu_read_lock_sched_held (??:?)
[ 25.997311][ T1] ? rcu_read_lock_bh_held (??:?)
[ 25.997325][ T1] ? ____kasan_kmalloc (common.c:?)
[ 25.997348][ T1] ? __kasan_check_read (??:?)
[ 25.997376][ T1] do_initcalls (main.c:?)
[ 25.997419][ T1] kernel_init_freeable (main.c:?)
[ 25.997434][ T1] ? rest_init (main.c:?)
[ 25.997461][ T1] kernel_init (main.c:?)
[ 25.997481][ T1] ret_from_fork (??:?)
[   25.997537][    T1]  </TASK>
[   25.997547][    T1] irq event stamp: 177845
[ 25.997555][ T1] hardirqs last enabled at (177851): console_trylock_spinning (printk.c:?)
[ 25.997573][ T1] hardirqs last disabled at (177856): console_trylock_spinning (printk.c:?)
[ 25.997589][ T1] softirqs last enabled at (176444): __do_softirq (??:?)
[ 25.997608][ T1] softirqs last disabled at (176437): __irq_exit_rcu (softirq.c:?)
[   25.997623][    T1] ---[ end trace 0000000000000000 ]---
[   26.013462][   T14] general protection fault, probably for non-canonical address 0xdffffc0000000004: 0000 [#1] SMP KASAN
[   26.013480][   T14] KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027]
[   26.013490][   T14] CPU: 0 PID: 14 Comm: kworker/0:1 Tainted: G        W       T  6.2.0-rc6-01191-g180253782038 #1 a8db67375c3ac749313dafaec43f39836e38fae9
[   26.013503][   T14] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.0-debian-1.16.0-5 04/01/2014
[   26.013509][   T14] Workqueue: events drm_fb_helper_damage_work
[ 26.013528][ T14] RIP: 0010:ttm_mem_io_reserve (??:?)
[ 26.013544][ T14] Code: f6 31 ff 45 31 c0 c3 55 b8 ff ff 37 00 48 c1 e0 2a 48 89 e5 41 55 49 89 fd 48 8d 7e 20 48 89 fa 41 54 49 89 f4 48 c1 ea 03 53 <80> 3c 02 00 74 05 e8 05 60 e5 fe 49 83 7c 24 20 00 74 07 31 c0 e9
All code
========
    0:	f6 31                	divb   (%rcx)
    2:	ff 45 31             	incl   0x31(%rbp)
    5:	c0 c3 55             	rol    $0x55,%bl
    8:	b8 ff ff 37 00       	mov    $0x37ffff,%eax
    d:	48 c1 e0 2a          	shl    $0x2a,%rax
   11:	48 89 e5             	mov    %rsp,%rbp
   14:	41 55                	push   %r13


To reproduce:

         # build kernel
	cd linux
	cp config-6.2.0-rc6-01191-g180253782038 .config
	make HOSTCC=gcc-11 CC=gcc-11 ARCH=x86_64 olddefconfig prepare modules_prepare bzImage modules
	make HOSTCC=gcc-11 CC=gcc-11 ARCH=x86_64 INSTALL_MOD_PATH=<mod-install-dir> modules_install
	cd <mod-install-dir>
	find lib/ | cpio -o -H newc --quiet | gzip > modules.cgz


         git clone https://github.com/intel/lkp-tests.git
         cd lkp-tests
         bin/lkp qemu -k <bzImage> -m modules.cgz job-script # job-script is attached in this email

         # if come across any failure that blocks the test,
         # please remove ~/.lkp and /lkp dir to run from a clean state.




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