Re: Linux 4.2-rc1

[Shuah Khan]

On Sun, Jul 5, 2015 at 2:22 PM, Linus Torvalds
<torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
> It's Sunday, two weeks have passed, and the merge window is closed. I
> just pushed out the tag to the git trees, and tar-balls and patches
> should be mirroring out too.
>
> I thought this release would be one of the biggest ones ever, but it
> turns out that it will depend on how you count. Just counting pure
> commits, it is indeed one of the bigger rc1's in recent history, but
> 3.10-rc1 was almost as big, and then the final 3.10 grew from that
> more than most. I doubt we'll match the 3.10 release, since we have
> been getting progressively better at *not* merging tons of stuff after
> -rc1.
>
>

I am seeing the following NULL pointer dereference on my test system:

[    3.640599] BUG: unable to handle kernel NULL pointer dereference
at 0000000000000080
[    3.640609] IP: [<ffffffff814f1463>] firmware_uevent+0x23/0x80
[    3.640616] PGD 0
[    3.640620] Oops: 0000 [#1] SMP
[    3.640625] Modules linked in: iwlwifi snd_hda_intel snd_hda_codec
eeepc_wmi asus_wmi sparse_keymap drm_kms_helper snd_hda_core drm
crct10dif_pclmul snd_hwdep btusb crc32_pclmul btrtl
ghash_clmulni_intel cfg80211 btbcm snd_pcm btintel bluetooth
snd_seq_midi snd_seq_midi_event aesni_intel snd_rawmidi aes_x86_64 lrw
snd_seq dm_multipath gf128mul glue_helper scsi_dh ablk_helper cryptd
snd_seq_device snd_timer mei_me snd microcode mei serio_raw lpc_ich
shpchp soundcore i2c_algo_bit video wmi mac_hid parport_pc ppdev lp
parport autofs4 btrfs xor raid6_pq psmouse r8169 ahci dm_mirror
libahci mii dm_region_hash dm_log
[    3.640677] CPU: 6 PID: 362 Comm: systemd-udevd Not tainted 4.2.0-rc1+ #2
[    3.640681] Hardware name: System76, Inc. Wild Dog
Performance/H87-PLUS, BIOS 0705 12/05/2013
[    3.640687] task: ffff8800d82d0000 ti: ffff88040cba0000 task.ti:
ffff88040cba0000
[    3.640692] RIP: 0010:[<ffffffff814f1463>]  [<ffffffff814f1463>]
firmware_uevent+0x23/0x80
[    3.640699] RSP: 0018:ffff88040cba3c78  EFLAGS: 00010282
[    3.640703] RAX: 0000000000000000 RBX: ffff8800d80a7000 RCX: 0000000000000000
[    3.640707] RDX: 0000000000000000 RSI: ffffffff81ae290f RDI: ffff8800d80a7000
[    3.640710] RBP: ffff88040cba3c88 R08: 0000000000019d80 R09: ffff8800d80a7000
[    3.640714] R10: 0000000000000022 R11: 0000000000000246 R12: ffff8803f3681408
[    3.640717] R13: ffff8800d80a7000 R14: ffff8803f3681408 R15: 0000000000000001
[    3.640721] FS:  00007f3c3e7ba880(0000) GS:ffff88041fb80000(0000)
knlGS:0000000000000000
[    3.640726] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    3.640730] CR2: 0000000000000080 CR3: 00000003f29b3000 CR4: 00000000001407e0
[    3.640734] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[    3.640738] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[    3.640741] Stack:
[    3.640744]  ffff8803f3681418 0000000000000000 ffff88040cba3cd8
ffffffff814dd876
[    3.640750]  ffff88040cba3dd8 0000000000000920 ffff8803f2c20e80
ffff88040f1ef960
[    3.640757]  0000000000000000 ffff8800d80a4000 ffff8800d80a7000
ffff8803f3681418
[    3.640763] Call Trace:
[    3.640769]  [<ffffffff814dd876>] dev_uevent+0xb6/0x290
[    3.640773]  [<ffffffff814dc6d4>] uevent_show+0x94/0x100
[    3.640778]  [<ffffffff814dbbe0>] dev_attr_show+0x20/0x50
[    3.640783]  [<ffffffff8176ffe6>] ? mutex_lock+0x16/0x40
[    3.640788]  [<ffffffff8124fe4a>] sysfs_kf_seq_show+0xaa/0x120
[    3.640793]  [<ffffffff8124e6e0>] kernfs_seq_show+0x20/0x30
[    3.640798]  [<ffffffff811fad4d>] seq_read+0xcd/0x370
[    3.640803]  [<ffffffff8124ee77>] kernfs_fop_read+0x107/0x160
[    3.640808]  [<ffffffff811d78b8>] __vfs_read+0x28/0xd0
[    3.640813]  [<ffffffff81316273>] ? security_file_permission+0xa3/0xc0
[    3.640817]  [<ffffffff811d7de3>] ? rw_verify_area+0x53/0xf0
[    3.640821]  [<ffffffff811d7f0a>] vfs_read+0x8a/0x130
[    3.640825]  [<ffffffff811d8d06>] SyS_read+0x46/0xa0
[    3.640829]  [<ffffffff81772172>] entry_SYSCALL_64_fastpath+0x16/0x75
[    3.640833] Code: 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89
e5 41 54 53 48 8b 87 c0 02 00 00 48 89 f3 49 89 fc 48 c7 c6 0f 29 ae
81 48 89 df <48> 8b 90 80 00 00 00 31 c0 e8 5f cf ea ff 85 c0 75 39 8b
15 ed
[    3.640865] RIP  [<ffffffff814f1463>] firmware_uevent+0x23/0x80
[    3.640871]  RSP <ffff88040cba3c78>
[    3.640874] CR2: 0000000000000080
[    3.640878] ---[ end trace 0df1af0431b2ec1a ]---
[    3.703087] snd_hda_codec_realtek hdaudioC1D0: autoconfig for
ALC887-VD: line_outs=1 (0x14/0x0/0x0/0x0/0x0) type:line
[    3.703092] snd_hda_codec_realtek hdaudioC1D0:    speaker_outs=0
(0x0/0x0/0x0/0x0/0x0)
[    3.703095] snd_hda_codec_realtek hdaudioC1D0:    hp_outs=1
(0x1b/0x0/0x0/0x0/0x0)
[    3.703098] snd_hda_codec_realtek hdaudioC1D0:    mono: mono_out=0x0
[    3.703100] snd_hda_codec_realtek hdaudioC1D0:    dig-out=0x11/0x0
[    3.703102] snd_hda_codec_realtek hdaudioC1D0:    inputs:
[    3.703104] snd_hda_codec_realtek hdaudioC1D0:      Front Mic=0x19
[    3.703106] snd_hda_codec_realtek hdaudioC1D0:      Rear Mic=0x18
[    3.703108] snd_hda_codec_realtek hdaudioC1D0:      Line=0x1a

I can send config and full dmesg if you would like to see it.

thanks,
-- Shuah
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