At boot time, we got the following Bug on our CFL machine (https://intel-gfx-ci.01.org/hardware.html#fi-cfl-8700k): <1>[ 5.190384] BUG: unable to handle kernel NULL pointer dereference at 000000000000093d <6>[ 5.190385] PGD 0 P4D 0 <4>[ 5.190388] Oops: 0000 [#1] PREEMPT SMP PTI <4>[ 5.190389] CPU: 8 PID: 668 Comm: alsactl Not tainted 4.20.0-rc6-g4ef95f23369b-drmtip_171+ #1 <4>[ 5.190390] Hardware name: Micro-Star International Co., Ltd. MS-7B54/Z370M MORTAR (MS-7B54), BIOS 1.00 10/31/2017 <4>[ 5.190394] RIP: 0010:automute_mode_info+0xe/0x40 [snd_hda_codec_generic] <4>[ 5.190395] Code: ff ff ff 66 0f 1f 84 00 00 00 00 00 ba 01 00 00 00 e9 66 ff ff ff 66 0f 1f 44 00 00 48 8b 87 80 00 00 00 48 8b 80 70 05 00 00 <0f> b6 80 3d 09 00 00 83 e0 06 3c 06 74 09 31 c9 31 d2 e9 db 87 05 <4>[ 5.190396] RSP: 0018:ffffb826c0833c90 EFLAGS: 00010282 <4>[ 5.190397] RAX: 0000000000000000 RBX: ffffb826c0833cc8 RCX: 0000000000000000 <4>[ 5.190398] RDX: 0000000000000000 RSI: ffffb826c0833cc8 RDI: ffff954e0bb61ef8 <4>[ 5.190399] RBP: ffff954e0bb61ef8 R08: 0000000000000000 R09: 0000000000000000 <4>[ 5.190400] R10: ffffb826c0833c18 R11: 0000000000000001 R12: ffff954e18450600 <4>[ 5.190401] R13: ffff954e1261a508 R14: ffff954e1261a508 R15: 0000000000000000 <4>[ 5.190402] FS: 00007f059ccf6740(0000) GS:ffff954e26a00000(0000) knlGS:0000000000000000 <4>[ 5.190403] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 <4>[ 5.190403] CR2: 000000000000093d CR3: 00000002583c8005 CR4: 00000000003606e0 <4>[ 5.190404] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 <4>[ 5.190405] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 <4>[ 5.190406] Call Trace: <4>[ 5.190409] snd_ctl_elem_info+0x4e/0x160 <4>[ 5.190411] snd_ctl_elem_info_user+0x52/0xa0 <4>[ 5.190417] snd_ctl_ioctl+0x602/0x750 <4>[ 5.190419] ? __handle_mm_fault+0x80a/0xfa0 <4>[ 5.190423] do_vfs_ioctl+0xa0/0x6e0 <4>[ 5.190426] ? __do_page_fault+0x2a5/0x550 <4>[ 5.190428] ? syscall_trace_enter+0xd3/0x310 <4>[ 5.190430] ksys_ioctl+0x35/0x60 <4>[ 5.190432] __x64_sys_ioctl+0x11/0x20 <4>[ 5.190433] do_syscall_64+0x55/0x190 <4>[ 5.190435] entry_SYSCALL_64_after_hwframe+0x49/0xbe <4>[ 5.190437] RIP: 0033:0x7f059bf525d7 <4>[ 5.190438] Code: b3 66 90 48 8b 05 b1 48 2d 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 81 48 2d 00 f7 d8 64 89 01 48 <4>[ 5.190439] RSP: 002b:00007fff9e88b028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 <4>[ 5.190440] RAX: ffffffffffffffda RBX: 00007fff9e88b040 RCX: 00007f059bf525d7 <4>[ 5.190441] RDX: 00007fff9e88b040 RSI: 00000000c1105511 RDI: 0000000000000003 <4>[ 5.190441] RBP: 00007fff9e88b710 R08: 000000000000000c R09: 0000555619aea1d0 <4>[ 5.190442] R10: 00007f059bfc83f0 R11: 0000000000000246 R12: 0000555619aea088 <4>[ 5.190443] R13: 0000555619ae9fd0 R14: 00007fff9e88b6c8 R15: 0000000000000002 <4>[ 5.190464] Modules linked in: snd_hda_codec_hdmi snd_hda_codec_realtek(+) snd_hda_codec_generic i915 x86_pkg_temp_thermal coretemp snd_hda_intel snd_hda_codec crct10dif_pclmul crc32_pclmul snd_hwdep snd_hda_core ghash_clmulni_intel e1000e snd_pcm mei_me mei i2c_i801 prime_numbers <4>[ 5.213483] CR2: 000000000000093d <4>[ 5.213484] ---[ end trace 6e2e5d7f4c404191 ]--- <3>[ 5.213846] BUG: sleeping function called from invalid context at kernel/sched/completion.c:99 <3>[ 5.216345] in_atomic(): 1, irqs_disabled(): 1, pid: 668, name: alsactl <4>[ 5.216345] INFO: lockdep is turned off. <4>[ 5.216346] irq event stamp: 22524 <4>[ 5.216348] hardirqs last enabled at (22523): [<ffffffff8500262d>] do_syscall_64+0xd/0x190 <4>[ 5.216349] hardirqs last disabled at (22524): [<ffffffff850019b0>] trace_hardirqs_off_thunk+0x1a/0x1c <4>[ 5.216350] softirqs last enabled at (21770): [<ffffffff85c0033a>] __do_softirq+0x33a/0x4b9 <4>[ 5.216352] softirqs last disabled at (21763): [<ffffffff85093009>] irq_exit+0xa9/0xc0 <3>[ 5.216352] Preemption disabled at: <4>[ 5.216353] [<0000000000000000>] (null) <4>[ 5.216354] CPU: 8 PID: 668 Comm: alsactl Tainted: G D 4.20.0-rc6-g4ef95f23369b-drmtip_171+ #1 <4>[ 5.216354] Hardware name: Micro-Star International Co., Ltd. MS-7B54/Z370M MORTAR (MS-7B54), BIOS 1.00 10/31/2017 <4>[ 5.216355] Call Trace: <4>[ 5.216357] dump_stack+0x67/0x9b <4>[ 5.216359] ___might_sleep+0x167/0x250 <4>[ 5.216361] wait_for_common+0x40/0x1f0 <4>[ 5.216364] virt_efi_query_variable_info+0x161/0x1b0 <4>[ 5.216366] efi_query_variable_store+0xb3/0x1a0 <4>[ 5.216368] ? efivar_entry_set_safe+0x168/0x1d0 <4>[ 5.216369] ? efi_delete_dummy_variable+0x90/0x90 <4>[ 5.216370] efivar_entry_set_safe+0x168/0x1d0 <4>[ 5.216373] ? efi_pstore_write+0x105/0x150 <4>[ 5.216374] ? efi_pstore_write+0xa2/0x150 <4>[ 5.216376] efi_pstore_write+0x105/0x150 <4>[ 5.232871] pstore_dump+0x12b/0x350 <4>[ 5.232891] kmsg_dump+0x87/0x1c0 <4>[ 5.232893] oops_end+0x3e/0x90 <4>[ 5.232895] no_context+0x167/0x410 <4>[ 5.232897] page_fault+0x1e/0x30 <4>[ 5.232900] RIP: 0010:automute_mode_info+0xe/0x40 [snd_hda_codec_generic] <4>[ 5.232900] Code: ff ff ff 66 0f 1f 84 00 00 00 00 00 ba 01 00 00 00 e9 66 ff ff ff 66 0f 1f 44 00 00 48 8b 87 80 00 00 00 48 8b 80 70 05 00 00 <0f> b6 80 3d 09 00 00 83 e0 06 3c 06 74 09 31 c9 31 d2 e9 db 87 05 <4>[ 5.232901] RSP: 0018:ffffb826c0833c90 EFLAGS: 00010282 <4>[ 5.232902] RAX: 0000000000000000 RBX: ffffb826c0833cc8 RCX: 0000000000000000 <4>[ 5.232902] RDX: 0000000000000000 RSI: ffffb826c0833cc8 RDI: ffff954e0bb61ef8 <4>[ 5.232903] RBP: ffff954e0bb61ef8 R08: 0000000000000000 R09: 0000000000000000 <4>[ 5.232904] R10: ffffb826c0833c18 R11: 0000000000000001 R12: ffff954e18450600 <4>[ 5.232904] R13: ffff954e1261a508 R14: ffff954e1261a508 R15: 0000000000000000 <4>[ 5.232907] snd_ctl_elem_info+0x4e/0x160 <4>[ 5.232909] snd_ctl_elem_info_user+0x52/0xa0 <4>[ 5.243785] snd_ctl_ioctl+0x602/0x750 <4>[ 5.243787] ? __handle_mm_fault+0x80a/0xfa0 <4>[ 5.243789] do_vfs_ioctl+0xa0/0x6e0 <4>[ 5.243791] ? __do_page_fault+0x2a5/0x550 <4>[ 5.243792] ? syscall_trace_enter+0xd3/0x310 <4>[ 5.243794] ksys_ioctl+0x35/0x60 <4>[ 5.243795] __x64_sys_ioctl+0x11/0x20 <4>[ 5.243796] do_syscall_64+0x55/0x190 <4>[ 5.243797] entry_SYSCALL_64_after_hwframe+0x49/0xbe <4>[ 5.243798] RIP: 0033:0x7f059bf525d7 <4>[ 5.243799] Code: b3 66 90 48 8b 05 b1 48 2d 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 81 48 2d 00 f7 d8 64 89 01 48 <4>[ 5.243800] RSP: 002b:00007fff9e88b028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 <4>[ 5.243801] RAX: ffffffffffffffda RBX: 00007fff9e88b040 RCX: 00007f059bf525d7 <4>[ 5.243801] RDX: 00007fff9e88b040 RSI: 00000000c1105511 RDI: 0000000000000003 <4>[ 5.243802] RBP: 00007fff9e88b710 R08: 000000000000000c R09: 0000555619aea1d0 <4>[ 5.243803] R10: 00007f059bfc83f0 R11: 0000000000000246 R12: 0000555619aea088 <4>[ 5.243803] R13: 0000555619ae9fd0 R14: 00007fff9e88b6c8 R15: 0000000000000002 <3>[ 5.243910] BUG: scheduling while atomic: alsactl/668/0x00000002 <4>[ 5.261408] INFO: lockdep is turned off. <4>[ 5.261409] Modules linked in: snd_hda_codec_hdmi snd_hda_codec_realtek(+) snd_hda_codec_generic i915 x86_pkg_temp_thermal coretemp snd_hda_intel snd_hda_codec crct10dif_pclmul crc32_pclmul snd_hwdep snd_hda_core ghash_clmulni_intel e1000e snd_pcm mei_me mei i2c_i801 prime_numbers <3>[ 5.261415] Preemption disabled at: <4>[ 5.261415] [<0000000000000000>] (null) <4>[ 5.261417] CPU: 8 PID: 668 Comm: alsactl Tainted: G D W 4.20.0-rc6-g4ef95f23369b-drmtip_171+ #1 <4>[ 5.261417] Hardware name: Micro-Star International Co., Ltd. MS-7B54/Z370M MORTAR (MS-7B54), BIOS 1.00 10/31/2017 <4>[ 5.261417] Call Trace: <4>[ 5.261420] dump_stack+0x67/0x9b <4>[ 5.261421] __schedule_bug+0x7b/0xd0 <4>[ 5.261423] __schedule+0x8cf/0xb50 <4>[ 5.261425] ? wait_for_common+0x116/0x1f0 <4>[ 5.261426] schedule+0x2d/0x90 <4>[ 5.261444] schedule_timeout+0x236/0x4f0 <4>[ 5.261446] ? lock_acquire+0xa6/0x1c0 <4>[ 5.261447] ? wait_for_common+0x48/0x1f0 <4>[ 5.261449] ? wait_for_common+0x116/0x1f0 <4>[ 5.272896] wait_for_common+0x13a/0x1f0 <4>[ 5.272898] ? wake_up_q+0x70/0x70 <4>[ 5.272900] virt_efi_set_variable+0x151/0x1a0 <4>[ 5.272901] efivar_entry_set_safe+0xea/0x1d0 <4>[ 5.272904] ? efi_pstore_write+0x105/0x150 <4>[ 5.272905] ? efi_pstore_write+0xa2/0x150 <4>[ 5.272906] efi_pstore_write+0x105/0x150 <4>[ 5.272909] pstore_dump+0x12b/0x350 <4>[ 5.272912] kmsg_dump+0x87/0x1c0 <4>[ 5.272914] oops_end+0x3e/0x90 <4>[ 5.272915] no_context+0x167/0x410 <4>[ 5.272917] page_fault+0x1e/0x30 <4>[ 5.272919] RIP: 0010:automute_mode_info+0xe/0x40 [snd_hda_codec_generic] <4>[ 5.272920] Code: ff ff ff 66 0f 1f 84 00 00 00 00 00 ba 01 00 00 00 e9 66 ff ff ff 66 0f 1f 44 00 00 48 8b 87 80 00 00 00 48 8b 80 70 05 00 00 <0f> b6 80 3d 09 00 00 83 e0 06 3c 06 74 09 31 c9 31 d2 e9 db 87 05 <4>[ 5.272921] RSP: 0018:ffffb826c0833c90 EFLAGS: 00010282 <4>[ 5.272921] RAX: 0000000000000000 RBX: ffffb826c0833cc8 RCX: 0000000000000000 <4>[ 5.272922] RDX: 0000000000000000 RSI: ffffb826c0833cc8 RDI: ffff954e0bb61ef8 <4>[ 5.272922] RBP: ffff954e0bb61ef8 R08: 0000000000000000 R09: 0000000000000000 <4>[ 5.272923] R10: ffffb826c0833c18 R11: 0000000000000001 R12: ffff954e18450600 <4>[ 5.272923] R13: ffff954e1261a508 R14: ffff954e1261a508 R15: 0000000000000000 <4>[ 5.272926] snd_ctl_elem_info+0x4e/0x160 <4>[ 5.272927] snd_ctl_elem_info_user+0x52/0xa0 <4>[ 5.272931] snd_ctl_ioctl+0x602/0x750 <4>[ 5.272938] ? __handle_mm_fault+0x80a/0xfa0 <4>[ 5.272941] do_vfs_ioctl+0xa0/0x6e0 <4>[ 5.288884] ? __do_page_fault+0x2a5/0x550 <4>[ 5.288885] ? syscall_trace_enter+0xd3/0x310 <4>[ 5.288887] ksys_ioctl+0x35/0x60 <4>[ 5.288888] __x64_sys_ioctl+0x11/0x20 <4>[ 5.288889] do_syscall_64+0x55/0x190 <4>[ 5.288890] entry_SYSCALL_64_after_hwframe+0x49/0xbe <4>[ 5.288891] RIP: 0033:0x7f059bf525d7 <4>[ 5.288892] Code: b3 66 90 48 8b 05 b1 48 2d 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 81 48 2d 00 f7 d8 64 89 01 48 <4>[ 5.288892] RSP: 002b:00007fff9e88b028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 <4>[ 5.288910] RAX: ffffffffffffffda RBX: 00007fff9e88b040 RCX: 00007f059bf525d7 <4>[ 5.288911] RDX: 00007fff9e88b040 RSI: 00000000c1105511 RDI: 0000000000000003 <4>[ 5.288911] RBP: 00007fff9e88b710 R08: 000000000000000c R09: 0000555619aea1d0 <4>[ 5.288912] R10: 00007f059bfc83f0 R11: 0000000000000246 R12: 0000555619aea088 <4>[ 5.288912] R13: 0000555619ae9fd0 R14: 00007fff9e88b6c8 R15: 0000000000000002 <4>[ 5.288939] WARNING: CPU: 8 PID: 668 at kernel/rcu/tree_plugin.h:337 rcu_note_context_switch+0x84/0x610 <4>[ 5.298648] Modules linked in: snd_hda_codec_hdmi snd_hda_codec_realtek(+) snd_hda_codec_generic i915 x86_pkg_temp_thermal coretemp snd_hda_intel snd_hda_codec crct10dif_pclmul crc32_pclmul snd_hwdep snd_hda_core ghash_clmulni_intel e1000e snd_pcm mei_me mei i2c_i801 prime_numbers <4>[ 5.298653] CPU: 8 PID: 668 Comm: alsactl Tainted: G D W 4.20.0-rc6-g4ef95f23369b-drmtip_171+ #1 <4>[ 5.298654] Hardware name: Micro-Star International Co., Ltd. MS-7B54/Z370M MORTAR (MS-7B54), BIOS 1.00 10/31/2017 <4>[ 5.298655] RIP: 0010:rcu_note_context_switch+0x84/0x610 <4>[ 5.298656] Code: 25 00 4f 01 00 8b 88 7c 08 00 00 85 c9 0f 84 c4 01 00 00 45 84 ed 8b 85 78 03 00 00 0f 85 bf 00 00 00 85 c0 0f 8e bf 00 00 00 <0f> 0b 80 bd 7c 03 00 00 00 0f 84 d3 01 00 00 48 89 ef e8 e5 fc ff <4>[ 5.298656] RSP: 0018:ffffb826c08336d8 EFLAGS: 00010002 <4>[ 5.298657] RAX: 0000000000000001 RBX: ffff954e26a32c00 RCX: 0000000000000002 <4>[ 5.298658] RDX: 0000000000000002 RSI: 0000000000000000 RDI: ffffffff860ab156 <4>[ 5.298658] RBP: ffff954e126a8040 R08: 0000000000000000 R09: 0000000000000000 <4>[ 5.298659] R10: ffffb826c0833550 R11: ffffffff86248180 R12: ffff954e126a8040 <4>[ 5.298659] R13: 0000000000000000 R14: 0000000000031ec0 R15: 0000000000000000 <4>[ 5.298660] FS: 00007f059ccf6740(0000) GS:ffff954e26a00000(0000) knlGS:0000000000000000 <4>[ 5.298661] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 <4>[ 5.298661] CR2: 000000000000093d CR3: 00000002583c8005 CR4: 00000000003606e0 <4>[ 5.298662] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 <4>[ 5.298662] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 <4>[ 5.298662] Call Trace: <4>[ 5.298665] __schedule+0xbc/0xb50 <4>[ 5.298667] ? wait_for_common+0x116/0x1f0 <4>[ 5.298668] schedule+0x2d/0x90 <4>[ 5.298669] schedule_timeout+0x236/0x4f0 <4>[ 5.298670] ? lock_acquire+0xa6/0x1c0 <4>[ 5.298671] ? wait_for_common+0x48/0x1f0 <4>[ 5.298673] ? wait_for_common+0x116/0x1f0 <4>[ 5.298674] wait_for_common+0x13a/0x1f0 <4>[ 5.298675] ? wake_up_q+0x70/0x70 <4>[ 5.298677] virt_efi_set_variable+0x151/0x1a0 <4>[ 5.298679] efivar_entry_set_safe+0xea/0x1d0 <4>[ 5.319347] ? efi_pstore_write+0x105/0x150 <4>[ 5.319348] ? efi_pstore_write+0xa2/0x150 <4>[ 5.319349] efi_pstore_write+0x105/0x150 <4>[ 5.319352] pstore_dump+0x12b/0x350 <4>[ 5.319355] kmsg_dump+0x87/0x1c0 <4>[ 5.319356] oops_end+0x3e/0x90 <4>[ 5.319358] no_context+0x167/0x410 <4>[ 5.319377] page_fault+0x1e/0x30 <4>[ 5.319379] RIP: 0010:automute_mode_info+0xe/0x40 [snd_hda_codec_generic] <4>[ 5.319379] Code: ff ff ff 66 0f 1f 84 00 00 00 00 00 ba 01 00 00 00 e9 66 ff ff ff 66 0f 1f 44 00 00 48 8b 87 80 00 00 00 48 8b 80 70 05 00 00 <0f> b6 80 3d 09 00 00 83 e0 06 3c 06 74 09 31 c9 31 d2 e9 db 87 05 <4>[ 5.319380] RSP: 0018:ffffb826c0833c90 EFLAGS: 00010282 <4>[ 5.319380] RAX: 0000000000000000 RBX: ffffb826c0833cc8 RCX: 0000000000000000 <4>[ 5.319381] RDX: 0000000000000000 RSI: ffffb826c0833cc8 RDI: ffff954e0bb61ef8 <4>[ 5.319381] RBP: ffff954e0bb61ef8 R08: 0000000000000000 R09: 0000000000000000 <4>[ 5.319382] R10: ffffb826c0833c18 R11: 0000000000000001 R12: ffff954e18450600 <4>[ 5.319382] R13: ffff954e1261a508 R14: ffff954e1261a508 R15: 0000000000000000 <4>[ 5.319385] snd_ctl_elem_info+0x4e/0x160 <4>[ 5.319386] snd_ctl_elem_info_user+0x52/0xa0 <4>[ 5.319390] snd_ctl_ioctl+0x602/0x750 <4>[ 5.319391] ? __handle_mm_fault+0x80a/0xfa0 <4>[ 5.319393] do_vfs_ioctl+0xa0/0x6e0 <4>[ 5.319395] ? __do_page_fault+0x2a5/0x550 <4>[ 5.335378] ? syscall_trace_enter+0xd3/0x310 <4>[ 5.335379] ksys_ioctl+0x35/0x60 <4>[ 5.335381] __x64_sys_ioctl+0x11/0x20 <4>[ 5.335381] do_syscall_64+0x55/0x190 <4>[ 5.335383] entry_SYSCALL_64_after_hwframe+0x49/0xbe <4>[ 5.335383] RIP: 0033:0x7f059bf525d7 <4>[ 5.335384] Code: b3 66 90 48 8b 05 b1 48 2d 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 81 48 2d 00 f7 d8 64 89 01 48 <4>[ 5.335385] RSP: 002b:00007fff9e88b028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 <4>[ 5.335385] RAX: ffffffffffffffda RBX: 00007fff9e88b040 RCX: 00007f059bf525d7 <4>[ 5.335386] RDX: 00007fff9e88b040 RSI: 00000000c1105511 RDI: 0000000000000003 <4>[ 5.335386] RBP: 00007fff9e88b710 R08: 000000000000000c R09: 0000555619aea1d0 <4>[ 5.335387] R10: 00007f059bfc83f0 R11: 0000000000000246 R12: 0000555619aea088 <4>[ 5.335387] R13: 0000555619ae9fd0 R14: 00007fff9e88b6c8 R15: 0000000000000002 <4>[ 5.335389] irq event stamp: 22524 <4>[ 5.335390] hardirqs last enabled at (22523): [<ffffffff8500262d>] do_syscall_64+0xd/0x190 <4>[ 5.335391] hardirqs last disabled at (22524): [<ffffffff850019b0>] trace_hardirqs_off_thunk+0x1a/0x1c <4>[ 5.335392] softirqs last enabled at (21770): [<ffffffff85c0033a>] __do_softirq+0x33a/0x4b9 <4>[ 5.335394] softirqs last disabled at (21763): [<ffffffff85093009>] irq_exit+0xa9/0xc0 <4>[ 5.335395] WARNING: CPU: 8 PID: 668 at kernel/rcu/tree_plugin.h:337 rcu_note_context_switch+0x84/0x610 <4>[ 5.335395] ---[ end trace 6e2e5d7f4c404192 ]--- <4>[ 5.337622] general protection fault: 0000 [#2] PREEMPT SMP PTI <4>[ 5.485908] CPU: 8 PID: 380 Comm: kworker/8:2 Tainted: G D W 4.20.0-rc6-g4ef95f23369b-drmtip_171+ #1 <4>[ 5.485908] Hardware name: Micro-Star International Co., Ltd. MS-7B54/Z370M MORTAR (MS-7B54), BIOS 1.00 10/31/2017 <4>[ 5.485910] Workqueue: pm pm_runtime_work <4>[ 5.505230] RIP: 0010:__x86_indirect_thunk_rax+0x10/0x20 <4>[ 5.505231] Code: ff 30 c0 e9 e8 d1 d6 ff b9 f2 ff ff ff e9 ea d1 d6 ff 90 90 90 90 90 90 90 90 e8 07 00 00 00 f3 90 0f ae e8 eb f9 48 89 04 24 <c3> 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 e8 07 00 00 00 f3 <4>[ 5.505249] RSP: 0018:ffffb826c03abd20 EFLAGS: 00010202 <4>[ 5.526591] RAX: 6b6b6b6b6b6b6b6b RBX: ffff954e21bd0008 RCX: 0000000000000000 <4>[ 5.526592] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff954e21bd0008 <4>[ 5.526592] RBP: ffff954e21bd22a8 R08: 0000000000000000 R09: 0000000000000000 <4>[ 5.526593] R10: 0000000000000000 R11: ffff954e18456c98 R12: ffff954e21bd0568 <4>[ 5.526594] R13: 0000000000000000 R14: ffffffffc029c030 R15: 0000000000000008 <4>[ 5.526595] FS: 0000000000000000(0000) GS:ffff954e26a00000(0000) knlGS:0000000000000000 <4>[ 5.571923] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 <4>[ 5.571924] CR2: 000000000000093d CR3: 00000002583c8005 CR4: 00000000003606e0 <4>[ 5.571924] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 <4>[ 5.571925] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 <4>[ 5.571925] Call Trace: <4>[ 5.571930] ? alc_suspend+0x36/0x50 [snd_hda_codec_realtek] <4>[ 5.571933] ? hda_call_codec_suspend+0x1d/0xa0 [snd_hda_codec] <4>[ 5.571935] ? hda_codec_runtime_suspend+0x54/0xb0 [snd_hda_codec] <4>[ 5.571937] ? __rpm_callback+0xb3/0x1b0 <4>[ 5.571939] ? hda_codec_runtime_resume+0x60/0x60 [snd_hda_codec] <4>[ 5.572217] ? rpm_callback+0x1a/0x70 <4>[ 5.572220] ? hda_codec_runtime_resume+0x60/0x60 [snd_hda_codec] <4>[ 5.572221] ? rpm_suspend+0x125/0x6b0 <4>[ 5.572223] ? pm_runtime_work+0x6e/0xb0 <4>[ 5.572225] ? process_one_work+0x262/0x630 <4>[ 5.572227] ? worker_thread+0x37/0x380 <4>[ 5.572228] ? process_one_work+0x630/0x630 <4>[ 5.572229] ? kthread+0x119/0x130 <4>[ 5.572231] ? kthread_park+0x80/0x80 <4>[ 5.572250] ? ret_from_fork+0x3a/0x50 <4>[ 5.572253] Modules linked in: snd_hda_codec_hdmi snd_hda_codec_realtek(+) snd_hda_codec_generic i915 x86_pkg_temp_thermal coretemp snd_hda_intel snd_hda_codec crct10dif_pclmul crc32_pclmul snd_hwdep snd_hda_core ghash_clmulni_intel e1000e snd_pcm mei_me mei i2c_i801 prime_numbers <4>[ 5.572265] ---[ end trace 6e2e5d7f4c404193 ]--- <4>[ 5.741830] RIP: 0010:automute_mode_info+0xe/0x40 [snd_hda_codec_generic] <4>[ 5.741834] RIP: 0010:automute_mode_info+0xe/0x40 [snd_hda_codec_generic] <4>[ 5.741835] Code: ff ff ff 66 0f 1f 84 00 00 00 00 00 ba 01 00 00 00 e9 66 ff ff ff 66 0f 1f 44 00 00 48 8b 87 80 00 00 00 48 8b 80 70 05 00 00 <0f> b6 80 3d 09 00 00 83 e0 06 3c 06 74 09 31 c9 31 d2 e9 db 87 05 <4>[ 5.741836] RSP: 0018:ffffb826c0833c90 EFLAGS: 00010282 <4>[ 5.741837] RAX: 0000000000000000 RBX: ffffb826c0833cc8 RCX: 0000000000000000 <4>[ 5.741838] RDX: 0000000000000000 RSI: ffffb826c0833cc8 RDI: ffff954e0bb61ef8 <4>[ 5.741838] RBP: ffff954e0bb61ef8 R08: 0000000000000000 R09: 0000000000000000 <4>[ 5.741839] R10: ffffb826c0833c18 R11: 0000000000000001 R12: ffff954e18450600 <4>[ 5.741839] R13: ffff954e1261a508 R14: ffff954e1261a508 R15: 0000000000000000 <4>[ 5.741840] FS: 0000000000000000(0000) GS:ffff954e26a00000(0000) knlGS:0000000000000000 <4>[ 5.741841] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 <4>[ 5.741841] CR2: 000000000000093d CR3: 00000002583c8005 CR4: 00000000003606e0 <4>[ 5.741842] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 <4>[ 5.741842] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 <4>[ 5.827319] Code: ff ff ff 66 0f 1f 84 00 00 00 00 00 ba 01 00 00 00 e9 66 ff ff ff 66 0f 1f 44 00 00 48 8b 87 80 00 00 00 48 8b 80 70 05 00 00 <0f> b6 80 3d 09 00 00 83 e0 06 3c 06 74 09 31 c9 31 d2 e9 db 87 05 <4>[ 5.827320] RSP: 0018:ffffb826c0833c90 EFLAGS: 00010282 <4>[ 5.827321] RAX: 0000000000000000 RBX: ffffb826c0833cc8 RCX: 0000000000000000 <4>[ 5.827322] RDX: 0000000000000000 RSI: ffffb826c0833cc8 RDI: ffff954e0bb61ef8 <4>[ 5.827322] RBP: ffff954e0bb61ef8 R08: 0000000000000000 R09: 0000000000000000 <4>[ 5.827323] R10: ffffb826c0833c18 R11: 0000000000000001 R12: ffff954e18450600 <4>[ 5.827324] R13: ffff954e1261a508 R14: ffff954e1261a508 R15: 0000000000000000 <4>[ 5.827324] FS: 00007f059ccf6740(0000) GS:ffff954e268c0000(0000) knlGS:0000000000000000 <4>[ 5.827325] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 <4>[ 5.827326] CR2: 00007f91fafcfc00 CR3: 00000002583c8004 CR4: 00000000003606e0 <4>[ 5.827326] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 <4>[ 5.827327] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Here are the boot logs: https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_171/fi-cfl-8700k/boot26.log This particular bug has only been seen once so far, but another issue was also seen on a separate boot (will be filed in another bug).
I guess it's an issue that has been already addressed. Please check whether this still occurs in the 4.20-final based kernel.
Last seen this issue on IGT_5873 (10 months, 2 weeks old) ago. This issue can be closed. Archiving the filter.
The CI Bug Log issue associated to this bug has been archived. New failures matching the above filters will not be associated to this bug anymore.