Re: ❌ FAIL: Test report for kernel 5.3.9-rc1-dfe283e.cki (stable)

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----- Original Message -----
> 
> Hello,
> 
> We ran automated tests on a recent commit from this kernel tree:
> 
>        Kernel repo:
>        git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
>             Commit: dfe283e9fdac - Linux 5.3.9-rc1
> 
> The results of these automated tests are provided below.
> 
>     Overall result: FAILED (see details below)
>              Merge: OK
>            Compile: OK
>              Tests: FAILED
> 
> All kernel binaries, config files, and logs are available for download here:
> 
>   https://artifacts.cki-project.org/pipelines/262380
> 
> One or more kernel tests failed:
> 
>     x86_64:
>      ❌ LTP lite
>

Not a 5.3 -stable regression.

Failure comes from test that sanity checks all /proc files by doing
1k read from each. There are couple issues it hits wrt. snd_hda_*.

Example reproducer:
  dd if=/sys/kernel/debug/regmap/hdaudioC0D3-hdaudio/access of=out.txt count=1 bs=1024 iflag=nonblock

It's slow and triggers soft lockups [1]. And it also requires lot
of memory, triggering OOMs on smaller VMs:
0x0000000024f0437b-0x000000001a32b1c8 1073745920 seq_read+0x131/0x400 pages=262144 vmalloc vpages N0=262144

I'm leaning towards skipping all regmap entries in this test.
Comments are welcomed.

Regards,
Jan

[1]
[15341.137116] watchdog: BUG: soft lockup - CPU#2 stuck for 22s! [dd:636573]
[15341.144141] Modules linked in: nls_utf8 isofs dummy minix binfmt_misc nfsv3 nfs_acl nfs lockd grace fscache sctp rds brd vfat fat btrfs xor zstd_compress raid6_pq zstd_decompress loop tu
n ip6table_nat ip6_tables xt_conntrack iptable_filter xt_MASQUERADE xt_comment iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 veth bridge stp llc overlay fuse snd_hda_codec_r
ealtek snd_hda_codec_generic sunrpc ledtrig_audio snd_hda_codec_hdmi snd_hda_intel snd_hda_codec edac_mce_amd kvm_amd snd_hda_core ccp snd_hwdep snd_pcm kvm snd_timer irqbypass joydev snd c
rct10dif_pclmul crc32_pclmul soundcore broadcom bcm_phy_lib ghash_clmulni_intel sp5100_tco fam15h_power k10temp tg3 wmi_bmof pcspkr i2c_piix4 acpi_cpufreq ip_tables xfs libcrc32c radeon ata
_generic i2c_algo_bit pata_acpi drm_kms_helper firewire_ohci ttm crc32c_intel serio_raw pata_atiixp firewire_core drm crc_itu_t wmi [last unloaded: can]
[15341.223635] CPU: 2 PID: 636573 Comm: dd Tainted: G             L    5.3.9-rc1-dfe283e.cki #1
[15341.232073] Hardware name: AMD Pike/Pike, BIOS RPK1506A 09/03/2014
[15341.238467] RIP: 0010:regmap_readable+0x15/0x60
[15341.242996] Code: 25 28 00 00 00 75 07 48 83 c4 10 5b 5d c3 e8 92 08 a6 ff 66 90 0f 1f 44 00 00 48 83 bf b0 01 00 00 00 74 31 8b 97 48 01 00 00 <39> f2 0f 92 c0 85 d2 0f 95 c2 20 d0 75 1
d 48 83 7f 70 00 74 01 c3
[15341.261765] RSP: 0018:ffffb3b100697dc8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
[15341.269330] RAX: 0000000000000000 RBX: ffff8d1a63773400 RCX: 0000000000000b41
[15341.276723] RDX: 000000000fffffff RSI: 000000000f3b4139 RDI: ffff8d1a63773400
[15341.283858] RBP: 000000000f3b4139 R08: 0000000000000000 R09: 0000000000000000
[15341.290989] R10: 000000000000000f R11: ffff8d19901fffff R12: 0000000000000079
[15341.298114] R13: 000000000f3b4139 R14: 00000000ffffffff R15: 000000000000006e
[15341.305501] FS:  00007f4e067a0580(0000) GS:ffff8d1a6aa80000(0000) knlGS:0000000000000000
[15341.313583] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[15341.319322] CR2: 00007f5083682dc0 CR3: 00000001287dc000 CR4: 00000000000406e0
[15341.326462] Call Trace:
[15341.328912]  regmap_volatile+0x4f/0xa0
[15341.332667]  regmap_access_show+0x70/0x100
[15341.336997]  seq_read+0xcd/0x400
[15341.340247]  full_proxy_read+0x57/0x70
[15341.343997]  vfs_read+0x9d/0x150
[15341.347231]  ksys_read+0x5f/0xe0
[15341.350473]  do_syscall_64+0x5f/0x1a0
[15341.354166]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[15341.359216] RIP: 0033:0x7f4e066823c2
[15341.362795] Code: c0 e9 c2 fe ff ff 50 48 8d 3d c2 0d 0a 00 e8 b5 f1 01 00 0f 1f 44 00 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 0f 05 <48> 3d 00 f0 ff ff 77 56 c3 0f 1f 44 00 0
0 48 83 ec 28 48 89 54 24
[15341.381852] RSP: 002b:00007ffc6ad30e88 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
[15341.389427] RAX: ffffffffffffffda RBX: 0000000000000400 RCX: 00007f4e066823c2
[15341.396568] RDX: 0000000000000400 RSI: 0000561bc69f0000 RDI: 0000000000000000
[15341.403979] RBP: 0000561bc69f0000 R08: 0000561bc69efb60 R09: 00000000000000c0
[15341.411111] R10: 0000561bc69f0000 R11: 0000000000000246 R12: ffffffffffffffff
[15341.418244] R13: 0000000000000000 R14: 0000000000000000 R15: ffffffffffffffff

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