rockowitz
commented
5 years ago Looking at the trace, the hang is deep in the amdgpu driver, more specifically in the DisplayPort I2C-over-aux handling. As a result, a ddcutil call to i2c is hanging.
ddcutil could be rewritten to run i2c system calls in a separate thread, catch the SIGTERM and SIGKILL signals, and terminate execution, but that would add a lot of complexity for a problem that has never been reported before and appears to be caused by a driver bug.
Taking a cursory look at the amdgpu driver forums, it appears that there have been significant changes in this area in kernel 4.19. (You're on 4.18.) See, for example, bug 105724 at bugs.feedesktop.org.
If the problem does not resolve with 4.19, I suggest you post a bug to bugs.freedesktop.org. The initial response will likely ask if you've installed the latest development driver.
Are your monitors daisy-chained DisplayPort devices? That's a particularly problematic area.
Please run command "ddcutil interrogate" and send the output as an attachment. That may give me some further insight into what is going on.
Sanford
On 6/26/19 4:56 PM, Nick Vahalik wrote:
I was using Argos https://github.com/p-e-w/argos to write a script that sits in the Gnome Shell and would allow me to set some monitor configurations there. After messing up on the script, I started noticing that the script stopped working and that subsequent calls to |ddcutil| just hung. Like... cannot |Ctrl+C| and cannot |kill -9
|. The only thing that makes them disappear is a /hard/ system reboot. The system will just hang if I try to reboot. Note that everything else works perfectly and this issue only surfaced after scripting calls to ddcutil. I do have two monitors, if that matters.
Here's the output from |dmesg|, which appears to be relevant.
|[ 364.474872] Modules linked in: nls_iso8859_1 amdkfd amd_iommu_v2 edac_mce_amd snd_hda_codec_realtek eeepc_wmi snd_hda_codec_generic kvm_amd asus_wmi sparse_keymap amdgpu snd_hda_codec_hdmi wmi_bmof video kvm mxm_wmi snd_hda_intel irqbypass snd_hda_codec crct10dif_pclmul snd_hda_core crc32_pclmul ghash_clmulni_intel snd_usb_audio snd_seq_midi pcbc snd_seq_midi_event snd_usbmidi_lib snd_hwdep snd_rawmidi chash joydev input_leds snd_pcm gpu_sched aesni_intel aes_x86_64 ttm snd_seq crypto_simd cryptd glue_helper drm_kms_helper snd_seq_device snd_timer drm snd fb_sys_fops syscopyarea sysfillrect sysimgblt soundcore ccp k10temp wmi mac_hid sch_fq_codel parport_pc ppdev lp parport ip_tables x_tables autofs4 hid_generic usbhid hid igb nvme i2c_piix4 i2c_algo_bit dca nvme_core ahci libahci gpio_amdpt gpio_generic [ 364.474919] CPU: 12 PID: 7810 Comm: ddcutil Not tainted 4.18.0-24-generic #25~18.04.1-Ubuntu [ 364.474920] Hardware name: System manufacturer System Product Name/PRIME X470-PRO, BIOS 4207 12/07/2018 [ 364.474970] RIP: 0010:dal_gpio_open_ex+0x10/0x40 [amdgpu] [ 364.474971] Code: 48 89 e5 53 48 89 fb 48 8b 3f e8 2b 02 62 e4 48 c7 03 00 00 00 00 5b 5d c3 90 0f 1f 44 00 00 55 48 83 7f 08 00 48 89 e5 74 0e <0f> 0b e8 69 5d 51 e4 b8 05 00 00 00 5d c3 89 77 18 8b 57 14 4c 8d [ 364.474998] RSP: 0018:ffffb8018d6d7b88 EFLAGS: 00010282 [ 364.474999] RAX: 0000000000000000 RBX: ffff9ea7f8d98d00 RCX: 0000000000000037 [ 364.475000] RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffff9ea7f8d983c0 [ 364.475001] RBP: ffffb8018d6d7b88 R08: 0000000000000000 R09: 0000000000000000 [ 364.475002] R10: 0000000000000da0 R11: 0000000000000000 R12: 0000000000000003 [ 364.475003] R13: 0000000000000000 R14: 0000000000000000 R15: ffffb8018d6d7d50 [ 364.475005] FS: 00007fbdbd2c7b80(0000) GS:ffff9ea81ef00000(0000) knlGS:0000000000000000 [ 364.475006] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 364.475007] CR2: 000055c07fcdde78 CR3: 000000069add2000 CR4: 00000000003406e0 [ 364.475008] Call Trace: [ 364.475057] dal_ddc_open+0x32/0xe0 [amdgpu] [ 364.475103] dal_aux_engine_acquire+0x37/0x70 [amdgpu] [ 364.475148] dal_i2caux_acquire_aux_engine+0x58/0x80 [amdgpu] [ 364.475189] dal_i2caux_submit_aux_command+0x4b/0x1c0 [amdgpu] [ 364.475194] ? load_balance+0x164/0x9a0 [ 364.475239] dal_ddc_service_read_dpcd_data+0x63/0xa0 [amdgpu] [ 364.475242] ? syscall_return_via_sysret+0x13/0x83 [ 364.475289] dm_dp_aux_transfer+0xac/0xc0 [amdgpu] [ 364.475296] drm_dp_i2c_do_msg+0x86/0x270 [drm_kms_helper] [ 364.475298] ? switch_to_asm+0x34/0x70 [ 364.475303] drm_dp_i2c_xfer+0xc0/0x250 [drm_kms_helper] [ 364.475305] ? switch_to_asm+0x40/0x70 [ 364.475309] i2c_transfer+0x119/0x420 [ 364.475311] ? _cond_resched+0x19/0x40 [ 364.475313] i2c_transfer+0x5e/0xf0 [ 364.475315] i2c_transfer_buffer_flags+0x4d/0x70 [ 364.475317] i2cdev_read+0x77/0x120 [ 364.475321] __vfs_read+0x1b/0x40 [ 364.475323] vfs_read+0x8e/0x130 [ 364.475325] ksys_read+0x55/0xc0 [ 364.475327] x64_sys_read+0x1a/0x20 [ 364.475329] do_syscall_64+0x5a/0x120 [ 364.475332] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 364.475333] RIP: 0033:0x7fbdbbf46081 [ 364.475334] Code: fe ff ff 48 8d 3d 67 9c 0a 00 48 83 ec 08 e8 a6 4c 02 00 66 0f 1f 44 00 00 48 8d 05 81 08 2e 00 8b 00 85 c0 75 13 31 c0 0f 05 <48> 3d 00 f0 ff ff 77 57 f3 c3 0f 1f 44 00 00 41 54 55 49 89 d4 53 [ 364.475360] RSP: 002b:00007ffe5c71a208 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 364.475362] RAX: ffffffffffffffda RBX: 0000000000000014 RCX: 00007fbdbbf46081 [ 364.475363] RDX: 0000000000000014 RSI: 000055c07fcec430 RDI: 0000000000000003 [ 364.475364] RBP: 15abda1ca21f4c2f R08: 000055c07f85f4ee R09: 00007fbdbbfa4750 [ 364.475364] R10: 00007ffe5c71a1d0 R11: 0000000000000246 R12: 0000000000000003 [ 364.475365] R13: 000055c07fcec430 R14: 000055c07fcec740 R15: 0000000000000000 [ 364.475367] ---[ end trace 8d9af36c08ebfc40 ]--- [ 364.475374] int3: 0000 [#1] SMP NOPTI [ 364.475379] CPU: 12 PID: 7810 Comm: ddcutil Tainted: G W 4.18.0-24-generic #25~18.04.1-Ubuntu [ 364.475381] Hardware name: System manufacturer System Product Name/PRIME X470-PRO, BIOS 4207 12/07/2018 [ 364.475385] RIP: 0010:kgdb_breakpoint+0x14/0x20 [ 364.475386] Code: ea ff ff ff c3 90 0f 1f 44 00 00 55 31 c0 48 89 e5 5d c3 0f 1f 00 0f 1f 44 00 00 55 48 89 e5 f0 ff 05 68 7f 88 01 0f ae f8 cc <0f> ae f8 f0 ff 0d 5a 7f 88 01 5d c3 0f 1f 44 00 00 55 48 89 e5 e8 [ 364.475414] RSP: 0018:ffffb8018d6d7b78 EFLAGS: 00000202 [ 364.475416] RAX: 0000000000000000 RBX: ffff9ea7f8d98d00 RCX: 0000000000000037 [ 364.475418] RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffff9ea7f8d983c0 [ 364.475419] RBP: ffffb8018d6d7b78 R08: 0000000000000000 R09: 0000000000000000 [ 364.475421] R10: 0000000000000da0 R11: 0000000000000000 R12: 0000000000000003 [ 364.475422] R13: 0000000000000000 R14: 0000000000000000 R15: ffffb8018d6d7d50 [ 364.475425] FS: 00007fbdbd2c7b80(0000) GS:ffff9ea81ef00000(0000) knlGS:0000000000000000 [ 364.475427] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 364.475428] CR2: 000055c07fcdde78 CR3: 000000069add2000 CR4: 00000000003406e0 [ 364.475430] Call Trace: [ 364.475472] dal_gpio_open_ex+0x17/0x40 [amdgpu] [ 364.475513] dal_ddc_open+0x32/0xe0 [amdgpu] [ 364.475554] dal_aux_engine_acquire+0x37/0x70 [amdgpu] [ 364.475594] dal_i2caux_acquire_aux_engine+0x58/0x80 [amdgpu] [ 364.475632] dal_i2caux_submit_aux_command+0x4b/0x1c0 [amdgpu] [ 364.475635] ? load_balance+0x164/0x9a0 [ 364.475674] dal_ddc_service_read_dpcd_data+0x63/0xa0 [amdgpu] [ 364.475677] ? syscall_return_via_sysret+0x13/0x83 [ 364.475716] dm_dp_aux_transfer+0xac/0xc0 [amdgpu] [ 364.475721] drm_dp_i2c_do_msg+0x86/0x270 [drm_kms_helper] [ 364.475723] ? switch_to_asm+0x34/0x70 [ 364.475728] drm_dp_i2c_xfer+0xc0/0x250 [drm_kms_helper] [ 364.475731] ? switch_to_asm+0x40/0x70 [ 364.475733] i2c_transfer+0x119/0x420 [ 364.475736] ? _cond_resched+0x19/0x40 [ 364.475738] i2c_transfer+0x5e/0xf0 [ 364.475741] i2c_transfer_buffer_flags+0x4d/0x70 [ 364.475743] i2cdev_read+0x77/0x120 [ 364.475746] __vfs_read+0x1b/0x40 [ 364.475748] vfs_read+0x8e/0x130 [ 364.475750] ksys_read+0x55/0xc0 [ 364.475753] x64_sys_read+0x1a/0x20 [ 364.475755] do_syscall_64+0x5a/0x120 [ 364.475758] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 364.475759] RIP: 0033:0x7fbdbbf46081 [ 364.475760] Code: fe ff ff 48 8d 3d 67 9c 0a 00 48 83 ec 08 e8 a6 4c 02 00 66 0f 1f 44 00 00 48 8d 05 81 08 2e 00 8b 00 85 c0 75 13 31 c0 0f 05 <48> 3d 00 f0 ff ff 77 57 f3 c3 0f 1f 44 00 00 41 54 55 49 89 d4 53 [ 364.475784] RSP: 002b:00007ffe5c71a208 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 364.475786] RAX: ffffffffffffffda RBX: 0000000000000014 RCX: 00007fbdbbf46081 [ 364.475788] RDX: 0000000000000014 RSI: 000055c07fcec430 RDI: 0000000000000003 [ 364.475789] RBP: 15abda1ca21f4c2f R08: 000055c07f85f4ee R09: 00007fbdbbfa4750 [ 364.475791] R10: 00007ffe5c71a1d0 R11: 0000000000000246 R12: 0000000000000003 [ 364.475792] R13: 000055c07fcec430 R14: 000055c07fcec740 R15: 0000000000000000 [ 364.475794] Modules linked in: nls_iso8859_1 amdkfd amd_iommu_v2 edac_mce_amd snd_hda_codec_realtek eeepc_wmi snd_hda_codec_generic kvm_amd asus_wmi sparse_keymap amdgpu snd_hda_codec_hdmi wmi_bmof video kvm mxm_wmi snd_hda_intel irqbypass snd_hda_codec crct10dif_pclmul snd_hda_core crc32_pclmul ghash_clmulni_intel snd_usb_audio snd_seq_midi pcbc snd_seq_midi_event snd_usbmidi_lib snd_hwdep snd_rawmidi chash joydev input_leds snd_pcm gpu_sched aesni_intel aes_x86_64 ttm snd_seq crypto_simd cryptd glue_helper drm_kms_helper snd_seq_device snd_timer drm snd fb_sys_fops syscopyarea sysfillrect sysimgblt soundcore ccp k10temp wmi mac_hid sch_fq_codel parport_pc ppdev lp parport ip_tables x_tables autofs4 hid_generic usbhid hid igb nvme i2c_piix4 i2c_algo_bit dca nvme_core ahci libahci gpio_amdpt gpio_generic [ 364.475824] ---[ end trace 8d9af36c08ebfc41 ]--- [ 364.475827] RIP: 0010:kgdb_breakpoint+0x14/0x20 [ 364.475828] Code: ea ff ff ff c3 90 0f 1f 44 00 00 55 31 c0 48 89 e5 5d c3 0f 1f 00 0f 1f 44 00 00 55 48 89 e5 f0 ff 05 68 7f 88 01 0f ae f8 cc <0f> ae f8 f0 ff 0d 5a 7f 88 01 5d c3 0f 1f 44 00 00 55 48 89 e5 e8 [ 364.475851] RSP: 0018:ffffb8018d6d7b78 EFLAGS: 00000202 [ 364.475853] RAX: 0000000000000000 RBX: ffff9ea7f8d98d00 RCX: 0000000000000037 [ 364.475854] RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffff9ea7f8d983c0 [ 364.475856] RBP: ffffb8018d6d7b78 R08: 0000000000000000 R09: 0000000000000000 [ 364.475857] R10: 0000000000000da0 R11: 0000000000000000 R12: 0000000000000003 [ 364.475859] R13: 0000000000000000 R14: 0000000000000000 R15: ffffb8018d6d7d50 [ 364.475861] FS: 00007fbdbd2c7b80(0000) GS:ffff9ea81ef00000(0000) knlGS:0000000000000000 [ 364.475862] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 364.475864] CR2: 000055c07fcdde78 CR3: 000000069add2000 CR4: 00000000003406e0 |
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nvahalik
MelonFunction
I was using Argos to write a script that sits in the Gnome Shell and would allow me to set some monitor configurations there. After messing up on the script, I started noticing that the script stopped working and that subsequent calls to
ddcutiljust hung. Like... cannotCtrl+Cand cannotkill -9 <pid-of-hung-ddcutil>. The only thing that makes them disappear is a hard system reboot. The system will just hang if I try to reboot.Note that everything else works perfectly and this issue only surfaced after scripting calls to ddcutil. I do have two monitors, if that matters.
Here's the output from
dmesg, which appears to be relevant.