Hi folks. After upgrade kernel to 5.8RC1 (git69119673bd50) my system stopped playing sound. In the kernel log, I see the message 'invalid opcode: 0000 [#1] SMP NOPTI' which probably related to this issue.

[ 19.076508] page:ffffeb1b1dc14b00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 head:ffffeb1b1dc14b00 order:2 compound_mapcount:0 compound_pincount:0 [ 19.076515] flags: 0x17ffffc0010000(head) [ 19.076520] raw: 0017ffffc0010000 dead000000000100 dead000000000122 0000000000000000 [ 19.076524] raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000 [ 19.076527] page dumped because: VM_BUG_ON_PAGE(!PageLocked(head)) [ 19.076561] ------------[ cut here ]------------ [ 19.076562] kernel BUG at mm/huge_memory.c:2613! [ 19.076581] invalid opcode: 0000 [#1] SMP NOPTI [ 19.076584] CPU: 12 PID: 1787 Comm: pulseaudio Not tainted 5.8.0-0.rc1.20200617git69119673bd50.1.fc33.x86_64 #1 [ 19.076586] Hardware name: System manufacturer System Product Name/ROG STRIX X570-I GAMING, BIOS 1407 04/02/2020 [ 19.076592] RIP: 0010:split_huge_page_to_list+0x86a/0xd90 [ 19.076596] Code: 48 c7 c6 c0 d5 38 9c 48 8d 50 ff a8 01 48 0f 45 da 48 89 df e8 b7 d0 f8 ff 0f 0b 48 c7 c6 88 f1 3b 9c 48 89 df e8 a6 d0 f8 ff <0f> 0b 48 8b 07 f6 c4 04 0f 84 b4 f9 ff ff 48 89 df e8 f0 59 fc ff [ 19.076599] RSP: 0018:ffffb580c249fad8 EFLAGS: 00010296 [ 19.076601] RAX: 0000000000000000 RBX: ffffeb1b1dc14b00 RCX: ffff93f1fbbdb5f8 [ 19.076603] RDX: 00000000ffffffd8 RSI: 0000000000000000 RDI: ffff93f1fbbdb5f0 [ 19.076605] RBP: ffff93f21e2ff688 R08: 0000000000000000 R09: 0000000000000000 [ 19.076606] R10: 0000000000000001 R11: 0000000000000000 R12: ffff93f21e2d5000 [ 19.076608] R13: ffffeb1b1dc14b00 R14: 0000000000000007 R15: ffffeb1b1dc14b00 [ 19.076610] FS: 00007f6f4e421880(0000) GS:ffff93f1fba00000(0000) knlGS:0000000000000000 [ 19.076612] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 19.076613] CR2: 00007f6f3ceab000 CR3: 0000000779996000 CR4: 00000000003406e0 [ 19.076615] Call Trace: [ 19.076622] ? rcu_read_lock_sched_held+0x3f/0x80 [ 19.076626] ? __alloc_pages_nodemask+0x3df/0x450 [ 19.076631] iommu_dma_alloc+0x316/0x580 [ 19.076637] dma_alloc_attrs+0x86/0x90 [ 19.076645] snd_dma_alloc_pages+0xdf/0x160 [snd_pcm] [ 19.076651] snd_dma_alloc_pages_fallback+0x5d/0x80 [snd_pcm] [ 19.076657] snd_malloc_sgbuf_pages+0x166/0x380 [snd_pcm] [ 19.076665] ? trace_kmalloc+0xf2/0x120 [ 19.076670] snd_dma_alloc_pages+0x64/0x160 [snd_pcm] [ 19.076676] do_alloc_pages+0x3c/0x90 [snd_pcm] [ 19.076683] snd_pcm_lib_malloc_pages+0x115/0x1a0 [snd_pcm] [ 19.076690] snd_pcm_hw_params+0x4de/0x5b0 [snd_pcm] [ 19.076694] ? _copy_from_user+0x6b/0xb0 [ 19.076700] snd_pcm_common_ioctl+0x209/0x1340 [snd_pcm] [ 19.076703] ? selinux_file_ioctl+0x132/0x1e0 [ 19.076711] snd_pcm_ioctl+0x23/0x30 [snd_pcm] [ 19.076715] ksys_ioctl+0x82/0xc0 [ 19.076718] __x64_sys_ioctl+0x16/0x20 [ 19.076722] do_syscall_64+0x52/0xb0 [ 19.076724] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 19.076727] RIP: 0033:0x7f6f4ed53e9b [ 19.076728] Code: Bad RIP value. [ 19.076730] RSP: 002b:00007ffe556b7e18 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 19.076732] RAX: ffffffffffffffda RBX: 00007ffe556b8020 RCX: 00007f6f4ed53e9b [ 19.076733] RDX: 00007ffe556b8020 RSI: 00000000c2604111 RDI: 0000000000000016 [ 19.076735] RBP: 00005562734fdfa0 R08: 0000000000000000 R09: 0000000000000000 [ 19.076737] R10: 0000000000000004 R11: 0000000000000246 R12: 00005562734fdf20 [ 19.076738] R13: 00007ffe556b7e54 R14: 0000000000000000 R15: 00007ffe556b8020 [ 19.076743] Modules linked in: xt_CHECKSUM xt_MASQUERADE xt_conntrack ipt_REJECT nf_nat_tftp nf_conntrack_tftp tun bridge stp llc nft_objref nf_conntrack_netbios_ns nf_conntrack_broadcast nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nft_chain_nat ip6table_nat ip6table_mangle ip6table_raw ip6table_security iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c iptable_mangle iptable_raw iptable_security ip_set nf_tables nfnetlink ip6table_filter ip6_tables iptable_filter cmac bnep sunrpc vfat fat hid_logitech_hidpp joydev hid_logitech_dj mt76x2u mt76x2_common mt76x02_usb mt76_usb mt76x02_lib mt76 edac_mce_amd amd_energy kvm_amd kvm gspca_zc3xx gspca_main irqbypass eeepc_wmi asus_wmi btusb sparse_keymap btrtl video wmi_bmof btbcm btintel bluetooth ecdh_generic uvcvideo ecc videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 snd_usb_audio videobuf2_common snd_usbmidi_lib videodev snd_rawmidi pcspkr iwlmvm mc [ 19.076777] mac80211 snd_hda_codec_realtek snd_hda_codec_generic ledtrig_audio libarc4 snd_hda_codec_hdmi iwlwifi snd_hda_intel snd_intel_dspcfg snd_hda_codec snd_hda_core snd_hwdep cfg80211 snd_seq snd_seq_device rfkill snd_pcm snd_timer snd soundcore k10temp sp5100_tco i2c_piix4 acpi_cpufreq binfmt_misc ip_tables amdgpu iommu_v2 gpu_sched ttm crct10dif_pclmul drm_kms_helper crc32_pclmul crc32c_intel cec drm ghash_clmulni_intel ccp igb nvme nvme_core xhci_pci dca xhci_pci_renesas i2c_algo_bit wmi pinctrl_amd fuse [ 19.076798] ---[ end trace 14b750353357325c ]--- [ 19.076801] RIP: 0010:split_huge_page_to_list+0x86a/0xd90 [ 19.076804] Code: 48 c7 c6 c0 d5 38 9c 48 8d 50 ff a8 01 48 0f 45 da 48 89 df e8 b7 d0 f8 ff 0f 0b 48 c7 c6 88 f1 3b 9c 48 89 df e8 a6 d0 f8 ff <0f> 0b 48 8b 07 f6 c4 04 0f 84 b4 f9 ff ff 48 89 df e8 f0 59 fc ff [ 19.076806] RSP: 0018:ffffb580c249fad8 EFLAGS: 00010296 [ 19.076808] RAX: 0000000000000000 RBX: ffffeb1b1dc14b00 RCX: ffff93f1fbbdb5f8 [ 19.076809] RDX: 00000000ffffffd8 RSI: 0000000000000000 RDI: ffff93f1fbbdb5f0 [ 19.076811] RBP: ffff93f21e2ff688 R08: 0000000000000000 R09: 0000000000000000 [ 19.076812] R10: 0000000000000001 R11: 0000000000000000 R12: ffff93f21e2d5000 [ 19.076814] R13: ffffeb1b1dc14b00 R14: 0000000000000007 R15: ffffeb1b1dc14b00 [ 19.076816] FS: 00007f6f4e421880(0000) GS:ffff93f1fba00000(0000) knlGS:0000000000000000 [ 19.076817] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 19.076819] CR2: 00007f6f3ceab000 CR3: 0000000779996000 CR4: 00000000003406e0 [ 26.761111] logitech-hidpp-device 0003:046D:4087.000B: HID++ 4.2 device connected. [ 37.568414] rfkill: input handler enabled [ 43.157188] page:ffffeb1b1daca200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 head:ffffeb1b1daca200 order:2 compound_mapcount:0 compound_pincount:0 [ 43.157192] flags: 0x17ffffc0010000(head) [ 43.157195] raw: 0017ffffc0010000 dead000000000100 dead000000000122 0000000000000000 [ 43.157197] raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000 [ 43.157198] page dumped because: VM_BUG_ON_PAGE(!PageLocked(head)) [ 43.157209] ------------[ cut here ]------------

I would be happy to test any patch which fixes it.

-- Best Regards, Mike Gavrilov.