On Mon, Jan 22, 2024 at 02:49:59AM -0800, Shradha Gupta wrote:
> Hi all,
> to me it seems like the patch has uncovered a genuine warning in drm_helper_probe_single_connector_modes() function.
> Before calling drm_kms_helper_poll_enable() there should be check to see if mode_config.poll_enabled is set similar
> to the new suspend/resume changes in the patch.
> Is this understanding correct? Thoughts?
Gentle reminder about this.
I am planning of submitted this suggested fix, along with the original patch in a patchset. Hope that makes sense.
>
> On Fri, Jan 19, 2024 at 02:46:47PM +0800, kernel test robot wrote:
> >
> >
> > Hello,
> >
> > kernel test robot noticed "WARNING:at_drivers/gpu/drm/drm_probe_helper.c:#drm_kms_helper_poll_enable[drm_kms_helper]" on:
> >
> > commit: 98a690eb11a5f722cfff1dd5c3ac46f9ba326919 ("[PATCH v3] drm: Check output polling initialized before disabling")
> > url: https://github.com/intel-lab-lkp/linux/commits/Shradha-Gupta/drm-Check-output-polling-initialized-before-disabling/20240115-124300
> > base: git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
> > patch subject: [PATCH v3] drm: Check output polling initialized before disabling
> >
> > in testcase: boot
> >
> > compiler: gcc-12
> > test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G
> >
> > (please refer to attached dmesg/kmsg for entire log/backtrace)
> >
> >
> > +-------------------------------------------------------------------------------------------+------------+------------+
> > | | 45017df303 | 98a690eb11 |
> > +-------------------------------------------------------------------------------------------+------------+------------+
> > | WARNING:at_drivers/gpu/drm/drm_probe_helper.c:#drm_kms_helper_poll_enable[drm_kms_helper] | 0 | 8 |
> > | RIP:drm_kms_helper_poll_enable[drm_kms_helper] | 0 | 8 |
> > +-------------------------------------------------------------------------------------------+------------+------------+
> >
> >
> > If you fix the issue in a separate patch/commit (i.e. not just a new version of
> > the same patch/commit), kindly add following tags
> > | Reported-by: kernel test robot <oliver.sang@xxxxxxxxx>
> > | Closes: https://lore.kernel.org/oe-lkp/202401191128.db8423f1-oliver.sang@xxxxxxxxx
> >
> >
> >
> > The kernel config and materials to reproduce are available at:
> > https://download.01.org/0day-ci/archive/20240119/202401191128.db8423f1-oliver.sang@xxxxxxxxx
> >
> >
> >
> > [ 19.037694][ T142] [drm] Initialized bochs-drm 1.0.0 20130925 for 0000:00:02.0 on minor 0
> > [ 19.038726][ T142] ------------[ cut here ]------------
> > [ 19.039197][ T142] bochs-drm 0000:00:02.0: drm_WARN_ON_ONCE(!dev->mode_config.poll_enabled)
> > [ 19.039241][ T142] WARNING: CPU: 0 PID: 142 at drivers/gpu/drm/drm_probe_helper.c:305 drm_kms_helper_poll_enable+0x329/0x410 [drm_kms_helper]
> > [ 19.040963][ T142] Modules linked in: parport(+) bochs(+) joydev serio_raw drm_vram_helper ata_piix(+) drm_ttm_helper ttm libata ipmi_devintf ipmi_msghandler drm_kms_helper i2c_piix4 fuse drm ip_tables
> > [ 19.042413][ T142] CPU: 0 PID: 142 Comm: systemd-udevd Not tainted 6.7.0-rc3-00770-g98a690eb11a5 #1
> > [ 19.043146][ T142] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
> > [ 19.043972][ T142] RIP: 0010:drm_kms_helper_poll_enable+0x329/0x410 [drm_kms_helper]
> > [ 19.044685][ T142] Code: 48 8b 6b 50 48 85 ed 74 41 48 89 df e8 30 e0 5d c3 48 c7 c1 e0 8c 4b c0 48 89 ea 48 c7 c7 40 8a 4b c0 48 89 c6 e8 77 a3 d3 c1 <0f> 0b e9 ae fd ff ff e8 9b c6 53 c2 e9 4c fd ff ff 48 8b 7c 24 08
> > [ 19.046268][ T142] RSP: 0000:ffffc900007ef1c0 EFLAGS: 00010286
> > [ 19.046755][ T142] RAX: 0000000000000000 RBX: ffff888121dc40c0 RCX: 0000000000000027
> > [ 19.047400][ T142] RDX: 0000000000000027 RSI: 0000000000000004 RDI: ffff8883af030848
> > [ 19.048042][ T142] RBP: ffff888121d84260 R08: 0000000000000001 R09: ffffed1075e06109
> > [ 19.048688][ T142] R10: ffff8883af03084b R11: 0000000000000001 R12: ffff88815688a7a0
> > [ 19.049362][ T142] R13: 1ffff920000fde3b R14: 0000000000000000 R15: 0000000000000003
> > [ 19.050001][ T142] FS: 0000000000000000(0000) GS:ffff8883af000000(0063) knlGS:00000000f7950b00
> > [ 19.050722][ T142] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
> > [ 19.051259][ T142] CR2: 0000000058b17d6c CR3: 000000012463e000 CR4: 00000000000406f0
> > [ 19.051892][ T142] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> > [ 19.052568][ T142] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> > [ 19.053242][ T142] Call Trace:
> > [ 19.053531][ T142] <TASK>
> > [ 19.053780][ T142] ? __warn+0xcd/0x260
> > [ 19.054149][ T142] ? drm_kms_helper_poll_enable+0x329/0x410 [drm_kms_helper]
> > [ 19.054787][ T142] ? report_bug+0x267/0x2d0
> > [ 19.055173][ T142] ? handle_bug+0x3c/0x70
> > [ 19.055523][ T142] ? exc_invalid_op+0x17/0x40
> > [ 19.055904][ T142] ? asm_exc_invalid_op+0x1a/0x20
> > [ 19.056332][ T142] ? drm_kms_helper_poll_enable+0x329/0x410 [drm_kms_helper]
> > [ 19.056941][ T142] ? drm_kms_helper_poll_fini+0x80/0x80 [drm_kms_helper]
> > [ 19.057567][ T142] ? drm_modeset_lock+0xbf/0x2e0 [drm]
> > [ 19.058099][ T142] drm_helper_probe_single_connector_modes+0x3b6/0xe70 [drm_kms_helper]
> > [ 19.058788][ T142] ? __drm_helper_update_and_validate+0xc30/0xc30 [drm_kms_helper]
> > [ 19.059484][ T142] ? __mutex_lock_slowpath+0x10/0x10
> > [ 19.059924][ T142] drm_client_modeset_probe+0x3ab/0xef0 [drm]
> > [ 19.060491][ T142] ? drm_client_firmware_config+0x1980/0x1980 [drm]
> > [ 19.061233][ T142] __drm_fb_helper_initial_config_and_unlock+0xfa/0x7c0 [drm_kms_helper]
> > [ 19.061935][ T142] ? __drm_fb_helper_find_sizes+0x1170/0x1170 [drm_kms_helper]
> > [ 19.062577][ T142] ? mutex_lock+0xa3/0xf0
> > [ 19.062941][ T142] ? __mutex_lock_slowpath+0x10/0x10
> > [ 19.063398][ T142] ? mutex_lock+0xa3/0xf0
> > [ 19.063756][ T142] ? __mutex_lock_slowpath+0x10/0x10
> > [ 19.064214][ T142] drm_fbdev_generic_client_hotplug+0x161/0x210 [drm_kms_helper]
> > [ 19.064868][ T142] drm_client_register+0x168/0x230 [drm]
> > [ 19.065410][ T142] bochs_pci_probe+0x68f/0x8c0 [bochs]
> > [ 19.065860][ T142] ? _raw_spin_lock_irqsave+0x8b/0xe0
> > [ 19.066318][ T142] ? bochs_hw_init+0x650/0x650 [bochs]
> > [ 19.066821][ T142] ? bochs_hw_init+0x650/0x650 [bochs]
> > [ 19.067346][ T142] local_pci_probe+0xda/0x180
> > [ 19.067756][ T142] pci_call_probe+0x160/0x510
> > [ 19.068172][ T142] ? _raw_spin_lock+0x85/0xe0
> > [ 19.068575][ T142] ? pci_dev_set_disconnected+0x30/0x30
> > [ 19.069059][ T142] ? kernfs_add_one+0x2d4/0x440
> > [ 19.069483][ T142] ? pci_assign_irq+0x8a/0x280
> > [ 19.069892][ T142] ? pci_match_device+0x38c/0x690
> > [ 19.070338][ T142] ? kernfs_put+0x1c/0x30
> > [ 19.070700][ T142] pci_device_probe+0xef/0x230
> > [ 19.071112][ T142] ? pci_dma_configure+0x11d/0x170
> > [ 19.071532][ T142] really_probe+0x3d2/0xb40
> > [ 19.071911][ T142] __driver_probe_device+0x18c/0x440
> > [ 19.072369][ T142] ? klist_iter_init+0x70/0x70
> > [ 19.072770][ T142] driver_probe_device+0x4a/0x120
> > [ 19.073209][ T142] __driver_attach+0x1d2/0x490
> > [ 19.073609][ T142] ? __device_attach_driver+0x260/0x260
> > [ 19.074084][ T142] bus_for_each_dev+0x103/0x180
> > [ 19.074494][ T142] ? bus_remove_file+0x40/0x40
> > [ 19.074887][ T142] ? klist_add_tail+0x133/0x260
> > [ 19.075311][ T142] bus_add_driver+0x29a/0x570
> > [ 19.075701][ T142] driver_register+0x134/0x450
> > [ 19.076109][ T142] ? 0xffffffffc06d6000
> > [ 19.076457][ T142] do_one_initcall+0xa1/0x370
> > [ 19.076855][ T142] ? trace_event_raw_event_initcall_level+0x1a0/0x1a0
> > [ 19.077428][ T142] ? kasan_unpoison+0x44/0x70
> > [ 19.077823][ T142] do_init_module+0x22e/0x720
> > [ 19.078222][ T142] load_module+0x1826/0x25e0
> > [ 19.078603][ T142] ? post_relocation+0x370/0x370
> > [ 19.079022][ T142] ? kernel_read_file+0x243/0x820
> > [ 19.079431][ T142] ? __x64_sys_fspick+0x2a0/0x2a0
> > [ 19.079844][ T142] ? init_module_from_file+0xd1/0x130
> > [ 19.080295][ T142] init_module_from_file+0xd1/0x130
> > [ 19.080725][ T142] ? __ia32_sys_init_module+0xb0/0xb0
> > [ 19.081194][ T142] ? userfaultfd_unmap_prep+0x3d0/0x3d0
> > [ 19.081657][ T142] ? _raw_write_lock_irq+0xe0/0xe0
> > [ 19.082097][ T142] idempotent_init_module+0x23b/0x660
> > [ 19.082540][ T142] ? init_module_from_file+0x130/0x130
> > [ 19.082986][ T142] ? __fget_light+0x57/0x3d0
> > [ 19.083386][ T142] __ia32_sys_finit_module+0xbe/0x130
> > [ 19.083818][ T142] __do_fast_syscall_32+0x61/0xd0
> > [ 19.084243][ T142] do_fast_syscall_32+0x33/0x70
> > [ 19.084643][ T142] entry_SYSENTER_compat_after_hwframe+0x70/0x7a
> > [ 19.085165][ T142] RIP: 0023:0xf7fb7579
> > [ 19.085503][ T142] Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
> > [ 19.086546][ T142] RSP: 002b:00000000ff888b1c EFLAGS: 00200206 ORIG_RAX: 000000000000015e
> > [ 19.087012][ T142] RAX: ffffffffffffffda RBX: 0000000000000012 RCX: 00000000f7fa1d41
> > [ 19.087442][ T142] RDX: 0000000000000000 RSI: 0000000056b70730 RDI: 0000000056b6c600
> > [ 19.087868][ T142] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
> > [ 19.088324][ T142] R10: 0000000000000000 R11: 0000000000200206 R12: 0000000000000000
> > [ 19.088747][ T142] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
> > [ 19.089176][ T142] </TASK>
> > [ 19.089354][ T142] ---[ end trace 0000000000000000 ]---
> >
> >
> > --
> > 0-DAY CI Kernel Test Service
> > https://github.com/intel/lkp-tests/wiki
