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Description of problem: on 4.5 beta system with and intel audio sound card may panic on boot. Specifically, i have model 82801G(ICH7) on a new kentsfield system. Version-Release number of selected component (if applicable): reproduces on 2.6.9-46.EL How reproducible: boot the box Steps to Reproduce: 1. 2. 3. Actual results: Unable to handle kernel NULL pointer dereference at 0000000000000000 RIP: <ffffffffa0148193>{:snd_hda_codec:snd_hda_input_mux_info+16} PML4 729b5067 PGD 76a8b067 PMD 0 Oops: 0000 [1] SMP CPU 0 Modules linked in: md5 ipv6 parport_pc lp parport autofs4 i2c_dev i2c_core sunrpc ds yenta_dPid: 3649, comm: alsactl Not tainted 2.6.9-45.ELsmp RIP: 0010:[<ffffffffa0148193>] <ffffffffa0148193>{:snd_hda_codec:snd_hda_input_mux_info+16} RSP: 0018:000001007292fb58 EFLAGS: 00010206 RAX: 000001007fdd4400 RBX: 000001007f19c2c0 RCX: 0000000000000000 RDX: 000001007f19c2c0 RSI: 000001007292fc28 RDI: 0000000000000000 RBP: 000001007fdd4d68 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 000001007292fc28 R13: 0000007fbffff2e0 R14: 000001007fdd4c00 R15: 000001007736b780 FS: 0000002a95e05140(0000) GS:ffffffff804ed500(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 0000000000000000 CR3: 0000000000101000 CR4: 00000000000006e0 Process alsactl (pid: 3649, threadinfo 000001007292e000, task 0000010076b507f0) Stack: 0000000000000000 ffffffffa00fcb2f 00000005db3863a8 00000100746ee030 0000010002142760 0000000000000000 000001007292fbb8 ffffffff80132a8f 0000000000000002 0000010002142760 Call Trace:<ffffffffa00fcb2f>{:snd:snd_ctl_ioctl+1180} <ffffffff80132a8f>{activate_task+124 <ffffffff801d22ec>{avc_has_perm+70} <ffffffff8016a65a>{do_no_page+1712} <ffffffff801d5632>{selinux_file_ioctl+711} <ffffffff801eba95>{__up_read+16} <ffffffff801247e9>{do_page_fault+577} <ffffffff801ee1b5>{strncpy_from_user+74} <ffffffff8018bbc5>{sys_ioctl+853} <ffffffff8011026a>{system_call+126} Code: 8b 07 49 89 f8 89 46 50 8b 17 48 8d 7e 58 8b 46 54 8d 4a ff RIP <ffffffffa0148193>{:snd_hda_codec:snd_hda_input_mux_info+16} RSP <000001007292fb58> CR2: 0000000000000000 <0>Kernel panic - not syncing: Oops Expected results: no panic Additional info:
Created attachment 147797 [details] patch to fix the problem
Also worth noting is that no sound comes out of the box on either U4 or U5 with the patch mentioned in comment #1. This patch is being proposed as a temporary solution. Upstream kernles produce sound, but this would require a more extensive backport to get working properly.
This system booted fine on U4, while U5 panics the system on boot.
Since Keyword Regression exists, this is a blocker, not an exception. Cleared exception flag. Set blocker flag."
This request was evaluated by Red Hat Product Management for inclusion in a Red Hat Enterprise Linux maintenance release. Product Management has requested further review of this request by Red Hat Engineering, for potential inclusion in a Red Hat Enterprise Linux Update release for currently deployed products. This request is not yet committed for inclusion in an Update release.
committed in stream U5 build 49. A test kernel with this patch is available from http://people.redhat.com/~jbaron/rhel4/
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on the solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHBA-2007-0304.html