Please see the bisection report below about a kernel Oops. Reports aren't automatically sent to the public while we're trialing new bisection features on kernelci.org but this one looks valid. The log shows a kernel NULL pointer dereference: https://storage.kernelci.org/stable-rc/linux-5.4.y/v5.4.36-52-g35bbc55d9e29/arm64/defconfig/gcc-8/lab-baylibre/baseline-meson-g12a-x96-max.html#L1113 The call stack is not the same as in the commit message found by the bisection, so maybe it only fixed part of the problem: <1>[ 16.007376] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010 <1>[ 16.016300] Mem abort info: <1>[ 16.019269] ESR = 0x96000006 <1>[ 16.022571] EC = 0x25: DABT (current EL), IL = 32 bits <1>[ 16.028075] SET = 0, FnV = 0 <1>[ 16.031356] EA = 0, S1PTW = 0 <1>[ 16.034705] Data abort info: <1>[ 16.037837] ISV = 0, ISS = 0x00000006 <1>[ 16.041876] CM = 0, WnR = 0 <1>[ 16.045128] user pgtable: 4k pages, 48-bit VAs, pgdp=00000000be0f0000 <1>[ 16.051702] [0000000000000010] pgd=00000000be117003, pud=00000000be118003, pmd=0000000000000000 <0>[ 16.051709] Internal error: Oops: 96000006 [#1] PREEMPT SMP <4>[ 16.133466] CPU: 2 PID: 33 Comm: kworker/2:1 Tainted: G W 5.4.37-rc1 #1 <4>[ 16.141566] Hardware name: Shenzhen Amediatech Technology Co., Ltd X96 Max (DT) <4>[ 16.149087] Workqueue: events deferred_probe_work_func <4>[ 16.154419] pstate: 20000005 (nzCv daif -PAN -UAO) <4>[ 16.159428] pc : snd_soc_dapm_new_dai+0x3c/0x1b0 <4>[ 16.164252] lr : snd_soc_dapm_connect_dai_link_widgets+0x114/0x268 <4>[ 16.256970] Call trace: <4>[ 16.259647] snd_soc_dapm_new_dai+0x3c/0x1b0 <4>[ 16.264129] snd_soc_dapm_connect_dai_link_widgets+0x114/0x268 <4>[ 16.270167] snd_soc_instantiate_card+0x858/0xb88 <4>[ 16.275083] snd_soc_register_card+0xf8/0x120 <4>[ 16.279656] devm_snd_soc_register_card+0x40/0x90 <4>[ 16.284575] axg_card_probe+0x9dc/0xaf0 [snd_soc_meson_axg_sound_card] <4>[ 16.291299] platform_drv_probe+0x50/0xa0 <4>[ 16.295524] really_probe+0xd4/0x328 <4>[ 16.299319] driver_probe_device+0x54/0xe8 ... Guillaume On 01/05/2020 10:32, kernelci.org bot wrote: > * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * > * This automated bisection report was sent to you on the basis * > * that you may be involved with the breaking commit it has * > * found. No manual investigation has been done to verify it, * > * and the root cause of the problem may be somewhere else. * > * * > * If you do send a fix, please include this trailer: * > * Reported-by: "kernelci.org bot" <bot@xxxxxxxxxxxx> * > * * > * Hope this helps! * > * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * > > stable-rc/linux-5.4.y bisection: baseline.dmesg.alert on meson-g12a-x96-max > > Summary: > Start: 35bbc55d9e296 Linux 5.4.37-rc1 > Plain log: https://storage.kernelci.org/stable-rc/linux-5.4.y/v5.4.36-52-g35bbc55d9e29/arm64/defconfig/gcc-8/lab-baylibre/baseline-meson-g12a-x96-max.txt > HTML log: https://storage.kernelci.org/stable-rc/linux-5.4.y/v5.4.36-52-g35bbc55d9e29/arm64/defconfig/gcc-8/lab-baylibre/baseline-meson-g12a-x96-max.html > Result: 09f4294793bd3 ASoC: meson: axg-card: fix codec-to-codec link setup > > Checks: > revert: PASS > verify: PASS > > Parameters: > Tree: stable-rc > URL: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git > Branch: linux-5.4.y > Target: meson-g12a-x96-max > CPU arch: arm64 > Lab: lab-baylibre > Compiler: gcc-8 > Config: defconfig > Test case: baseline.dmesg.alert > > Breaking commit found: > > ------------------------------------------------------------------------------- > commit 09f4294793bd3e70d68fdab5b392dff18bff62ca > Author: Jerome Brunet <jbrunet@xxxxxxxxxxxx> > Date: Mon Apr 20 13:45:10 2020 +0200 > > ASoC: meson: axg-card: fix codec-to-codec link setup > > commit 1164284270779e1865cc2046a2a01b58a1e858a9 upstream. > > Since the addition of commit 9b5db059366a ("ASoC: soc-pcm: dpcm: Only allow > playback/capture if supported"), meson-axg cards which have codec-to-codec > links fail to init and Oops: > > Unable to handle kernel NULL pointer dereference at virtual address 0000000000000128 > Internal error: Oops: 96000044 [#1] PREEMPT SMP > CPU: 3 PID: 1582 Comm: arecord Not tainted 5.7.0-rc1 > pc : invalidate_paths_ep+0x30/0xe0 > lr : snd_soc_dapm_dai_get_connected_widgets+0x170/0x1a8 > Call trace: > invalidate_paths_ep+0x30/0xe0 > snd_soc_dapm_dai_get_connected_widgets+0x170/0x1a8 > dpcm_path_get+0x38/0xd0 > dpcm_fe_dai_open+0x70/0x920 > snd_pcm_open_substream+0x564/0x840 > snd_pcm_open+0xfc/0x228 > snd_pcm_capture_open+0x4c/0x78 > snd_open+0xac/0x1a8 > ... > > While initiliazing the links, ASoC treats the codec-to-codec links of this > card type as a DPCM backend. This error eventually leads to the Oops. > > Most of the card driver code is shared between DPCM backends and > codec-to-codec links. The property "no_pcm" marking DCPM BE was left set on > codec-to-codec links, leading to this problem. This commit fixes that. > > Fixes: 0a8f1117a680 ("ASoC: meson: axg-card: add basic codec-to-codec link support") > Signed-off-by: Jerome Brunet <jbrunet@xxxxxxxxxxxx> > Link: https://lore.kernel.org/r/20200420114511.450560-2-jbrunet@xxxxxxxxxxxx > Signed-off-by: Mark Brown <broonie@xxxxxxxxxx> > Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> > > diff --git a/sound/soc/meson/axg-card.c b/sound/soc/meson/axg-card.c > index 1f698adde506c..2b04ac3d8fd3b 100644 > --- a/sound/soc/meson/axg-card.c > +++ b/sound/soc/meson/axg-card.c > @@ -586,8 +586,10 @@ static int axg_card_add_link(struct snd_soc_card *card, struct device_node *np, > > if (axg_card_cpu_is_tdm_iface(dai_link->cpus->of_node)) > ret = axg_card_parse_tdm(card, np, index); > - else if (axg_card_cpu_is_codec(dai_link->cpus->of_node)) > + else if (axg_card_cpu_is_codec(dai_link->cpus->of_node)) { > dai_link->params = &codec_params; > + dai_link->no_pcm = 0; /* link is not a DPCM BE */ > + } > > return ret; > } > ------------------------------------------------------------------------------- > > > Git bisection log: > > ------------------------------------------------------------------------------- > git bisect start > # good: [aa73bcc376865c23e61dcebd467697b527901be8] Linux 5.4.36 > git bisect good aa73bcc376865c23e61dcebd467697b527901be8 > # bad: [35bbc55d9e296d37cf01555d415338b84a70d4c5] Linux 5.4.37-rc1 > git bisect bad 35bbc55d9e296d37cf01555d415338b84a70d4c5 > # bad: [924f1d37852ff357658c205dd114c70862865fc9] svcrdma: Fix trace point use-after-free race > git bisect bad 924f1d37852ff357658c205dd114c70862865fc9 > # good: [b848f65436665b5fe675fd3f645c1a458e49f60a] counter: 104-quad-8: Add lock guards - generic interface > git bisect good b848f65436665b5fe675fd3f645c1a458e49f60a > # bad: [04b53ed855129c1703d00d8494e4c61309714a99] drivers: soc: xilinx: fix firmware driver Kconfig dependency > git bisect bad 04b53ed855129c1703d00d8494e4c61309714a99 > # good: [ae886eae0318c71a6125347d6810a1578a83d262] ASoC: tas571x: disable regulators on failed probe > git bisect good ae886eae0318c71a6125347d6810a1578a83d262 > # bad: [2c0990070379284dda0b51304ce19c2b96e083a2] ASoC: wm8960: Fix wrong clock after suspend & resume > git bisect bad 2c0990070379284dda0b51304ce19c2b96e083a2 > # bad: [09f4294793bd3e70d68fdab5b392dff18bff62ca] ASoC: meson: axg-card: fix codec-to-codec link setup > git bisect bad 09f4294793bd3e70d68fdab5b392dff18bff62ca > # first bad commit: [09f4294793bd3e70d68fdab5b392dff18bff62ca] ASoC: meson: axg-card: fix codec-to-codec link setup > ------------------------------------------------------------------------------- >
