Latest 4.19.X (vanilla) kernel from Slackware-current cause following oops when running alsactl. Previous 4.14.X works fine with same system. Below is stack trace form 4.19.1, 4.19.0 looks almost the same. Nov 5 07:44:29 chinol kernel: [ 55.837081] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 Nov 5 07:44:29 chinol kernel: [ 55.839085] Oops: 0010 [#1] SMP PTI Nov 5 07:44:29 chinol kernel: [ 55.840001] CPU: 3 PID: 1385 Comm: alsactl Not tainted 4.19.1 #1 Nov 5 07:44:29 chinol kernel: [ 55.840944] Hardware name: LENOVO 25376Q0/25376Q0, BIOS 6IET85WW (1.45 ) 02/14/2013 Nov 5 07:44:29 chinol kernel: [ 55.841895] RIP: 0010: (null) Nov 5 07:44:29 chinol kernel: [ 55.842857] Code: Bad RIP value. Nov 5 07:44:29 chinol kernel: [ 55.843811] RSP: 0018:ffffa32541f17d48 EFLAGS: 00010202 Nov 5 07:44:29 chinol kernel: [ 55.844772] RAX: 0000000000000000 RBX: ffff8a5decf76d80 RCX: 0000000000000000 Nov 5 07:44:29 chinol kernel: [ 55.845751] RDX: 0000000000000001 RSI: 0000000000000001 RDI: 0000000000000001 Nov 5 07:44:29 chinol kernel: [ 55.846746] RBP: 0000000000000009 R08: ffffffffffffffff R09: 0000000000000000 Nov 5 07:44:29 chinol kernel: [ 55.847782] R10: 0000000000000b00 R11: 0000000000000000 R12: ffff8a5decf7e000 Nov 5 07:44:29 chinol kernel: [ 55.848834] R13: 0000000000000000 R14: ffff8a5dec605000 R15: 0000000000000003 Nov 5 07:44:29 chinol kernel: [ 55.849898] FS: 00007f776a532740(0000) GS:ffff8a5df3b80000(0000) knlGS:0000000000000000 Nov 5 07:44:29 chinol kernel: [ 55.850982] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Nov 5 07:44:29 chinol kernel: [ 55.852066] CR2: ffffffffffffffd6 CR3: 000000022151c006 CR4: 00000000000206e0 Nov 5 07:44:29 chinol kernel: [ 55.853177] Call Trace: Nov 5 07:44:29 chinol kernel: [ 55.854309] ? cap_put_caller+0x11f/0x160 [snd_hda_codec_generic] Nov 5 07:44:29 chinol kernel: [ 55.855457] ? snd_ctl_elem_write+0xe2/0x190 [snd] Nov 5 07:44:29 chinol kernel: [ 55.856578] ? __kmalloc_track_caller+0x12f/0x210 Nov 5 07:44:29 chinol kernel: [ 55.857711] ? snd_ctl_ioctl+0x12b/0x6d0 [snd] Nov 5 07:44:29 chinol kernel: [ 55.858823] ? __check_object_size+0xa9/0x17c Nov 5 07:44:29 chinol kernel: [ 55.859935] ? _copy_from_user+0x37/0x60 Nov 5 07:44:29 chinol kernel: [ 55.861060] ? snd_ctl_ioctl+0x169/0x6d0 [snd] Nov 5 07:44:29 chinol kernel: [ 55.862186] ? snd_card_file_remove+0x8a/0x150 [snd] Nov 5 07:44:29 chinol kernel: [ 55.863308] ? do_vfs_ioctl+0xa4/0x620 Nov 5 07:44:29 chinol kernel: [ 55.864433] ? set_close_on_exec+0x2a/0x60 Nov 5 07:44:29 chinol kernel: [ 55.865555] ? do_fcntl+0x524/0x610 Nov 5 07:44:29 chinol kernel: [ 55.866651] ? ksys_ioctl+0x60/0x90 Nov 5 07:44:29 chinol kernel: [ 55.867728] ? __x64_sys_fcntl+0x8b/0xb0 Nov 5 07:44:29 chinol kernel: [ 55.868816] ? __x64_sys_ioctl+0x16/0x20 Nov 5 07:44:29 chinol kernel: [ 55.869931] ? do_syscall_64+0x55/0x100 Nov 5 07:44:29 chinol kernel: [ 55.871041] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 Nov 5 07:44:29 chinol kernel: [ 55.872134] Modules linked in: rpcsec_gss_krb5 ipv6 8021q garp mrp stp llc fuse algif_skcipher af_alg joydev snd_hda_codec_hdmi hid_generic snd _hda_codec_conexant uvcvideo snd_hda_codec_generic videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 usbhid videodev hid videobuf2_common i915 kvmgt vfio_mdev mdev coretemp snd_ hda_intel intel_powerclamp vfio_iommu_type1 snd_hda_codec iwldvm vfio kvm_intel snd_hda_core cec rc_core mmc_block kvm snd_hwdep drm_kms_helper irqbypass i2c_dev crct10dif_pclmu l wmi_bmof mxm_wmi crc32_pclmul gpio_ich mac80211 crc32c_intel thinkpad_acpi drm ghash_clmulni_intel evdev tpm_tis snd_pcm firewire_ohci intel_cstate psmouse i2c_algo_bit sdhci_ pci nvram iwlwifi fb_sys_fops tpm_tis_core serio_raw i2c_i801 syscopyarea intel_ips snd_timer sysfillrect cqhci firewire_core thermal Nov 5 07:44:29 chinol kernel: [ 55.878294] hwmon intel_agp tpm battery mei_me sysimgblt cfg80211 snd intel_gtt sdhci ehci_pci soundcore ac e1000e i2c_core rfkill mmc_core ag pgart mei wmi video ehci_hcd lpc_ich button pcc_cpufreq acpi_cpufreq loop Nov 5 07:44:29 chinol kernel: [ 55.881014] CR2: 0000000000000000 Nov 5 07:44:29 chinol kernel: [ 55.882437] ---[ end trace 67c28e26fd859c3c ]--- Nov 5 07:44:29 chinol kernel: [ 55.883971] RIP: 0010: (null) Nov 5 07:44:29 chinol kernel: [ 55.885367] Code: Bad RIP value. Nov 5 07:44:29 chinol kernel: [ 55.886741] RSP: 0018:ffffa32541f17d48 EFLAGS: 00010202 Nov 5 07:44:29 chinol kernel: [ 55.888374] RAX: 0000000000000000 RBX: ffff8a5decf76d80 RCX: 0000000000000000 Nov 5 07:44:29 chinol kernel: [ 55.890051] RDX: 0000000000000001 RSI: 0000000000000001 RDI: 0000000000000001 Nov 5 07:44:29 chinol kernel: [ 55.891685] RBP: 0000000000000009 R08: ffffffffffffffff R09: 0000000000000000 Nov 5 07:44:29 chinol kernel: [ 55.893323] R10: 0000000000000b00 R11: 0000000000000000 R12: ffff8a5decf7e000 Nov 5 07:44:29 chinol kernel: [ 55.894965] R13: 0000000000000000 R14: ffff8a5dec605000 R15: 0000000000000003 Nov 5 07:44:29 chinol kernel: [ 55.896668] FS: 00007f776a532740(0000) GS:ffff8a5df3b80000(0000) knlGS:0000000000000000 Nov 5 07:44:29 chinol kernel: [ 55.898329] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Nov 5 07:44:29 chinol kernel: [ 55.900084] CR2: ffffffffffffffd6 CR3: 000000022151c006 CR4: 00000000000206e0
Hrm, not sure what broke, as there hasn't been so big changes in the generic parser. In anyway, please boot with the working kernel, and get alsa-info.sh output. Run the script with --no-upload option, and attach to Bugzilla.
Created attachment 279321 [details] alsa-info output
Thanks. I guess the patch below should fix the issue. Could you give it a try?
Created attachment 279325 [details] Fix patch
Thanks, I will test it as soon as I can.
Patch fix issue, alsactl no longer causes oops. Thanks again.
OK, I'll submit the fix and merge later. It'll be likely pushed for 4.20-rc1, then backported to 4.19.y stable tree later.