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[Stefan Bader <stefan.bader@xxxxxxxxxxxxx>]

There also was some case of a different panic which looked like below:

[   16.191583] BUG: unable to handle kernel NULL pointer dereference at 0000000000000148
[   16.201096] IP: [<ffffffff810a69f7>] check_preempt_wakeup+0x137/0x270
[   16.208349] PGD 0
[   16.211201] Oops: 0000 [#1] SMP
[   16.214877] Modules linked in: btrfs xor raid6_pq libcrc32c crct10dif_pclmul crc32_pclmul aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd igb ixgbe i2c_algo_bit ahci libahci dca ptp pps_core mdio megaraid_sas wmi
[   16.238385] CPU: 0 PID: 1 Comm: init Not tainted 3.13.0-88-generic #135-Ubuntu
[   16.246509] Hardware name: Dell Inc. PowerEdge R630/0CNCJW, BIOS 1.0.4 08/28/2014
[   16.254918] task: ffff883fd26b8000 ti: ffff881fd2aac000 task.ti: ffff881fd2aac000
[   16.263327] RIP: 0010:[<ffffffff810a69f7>]  [<ffffffff810a69f7>] check_preempt_wakeup+0x137/0x270
[   16.273317] RSP: 0018:ffff881fd2aad9e8  EFLAGS: 00010087
[   16.279280] RAX: 0000000000000002 RBX: 0000000000000000 RCX: 0000000000000000
[   16.287281] RDX: 0000000000000002 RSI: ffff881fce08b000 RDI: ffff881fff413200
[   16.295283] RBP: ffff881fd2aada20 R08: 0000000000000000 R09: 0000000000000000
[   16.303284] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
[   16.311285] R13: ffff883fd26b8000 R14: ffff881fff413180 R15: 0000000000000001
[   16.319292] FS:  00007fce8b255840(0000) GS:ffff881fff400000(0000) knlGS:0000000000000000
[   16.328379] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   16.334827] CR2: 0000000000000148 CR3: 0000001fd0fb7000 CR4: 00000000001407f0
[   16.342833] Stack:
[   16.345099]  ffff881fd2aada10 ffffffff8109fde5 ffff881fff413180 ffff881fce08b000
[   16.353487]  ffff881fff413180 0000000000000001 0000000000000000 ffff881fd2aada38
[   16.361884]  ffffffff8109aa25 ffff881fce08b000 ffff881fd2aada60 ffffffff8109aa59
[   16.370276] Call Trace:
[   16.373045]  [<ffffffff8109fde5>] ? sched_clock_cpu+0xb5/0x100
[   16.379606]  [<ffffffff8109aa25>] check_preempt_curr+0x85/0xa0
[   16.386154]  [<ffffffff8109aa59>] ttwu_do_wakeup+0x19/0xf0
[   16.392317]  [<ffffffff8109abdd>] ttwu_do_activate.constprop.75+0x5d/0x70
[   16.399935]  [<ffffffff8109d172>] try_to_wake_up+0x1d2/0x2c0
[   16.406287]  [<ffffffff8109d2b2>] default_wake_function+0x12/0x20
[   16.413135]  [<ffffffff811d5386>] pollwake+0x66/0x70
[   16.418715]  [<ffffffff8109d2a0>] ? wake_up_state+0x20/0x20
[   16.424982]  [<ffffffff810ad398>] __wake_up_common+0x58/0x90
[   16.431335]  [<ffffffff810ad945>] __wake_up_sync_key+0x45/0x60
[   16.437890]  [<ffffffff816165fa>] sock_def_readable+0x3a/0x70
[   16.444346]  [<ffffffff816c42e1>] unix_stream_sendmsg+0x1f1/0x400
[   16.451189]  [<ffffffff816139ab>] sock_sendmsg+0x8b/0xc0
[   16.457163]  [<ffffffff811524f3>] ? unlock_page+0x23/0x30
[   16.463237]  [<ffffffff8117afd2>] ? do_wp_page+0x392/0x7b0
[   16.469399]  [<ffffffff81613db9>] ___sys_sendmsg+0x389/0x3a0
[   16.475763]  [<ffffffff81735b44>] ? __do_page_fault+0x204/0x560
[   16.482411]  [<ffffffff811d7eec>] ? __dentry_kill+0x15c/0x1e0
[   16.488866]  [<ffffffff811d801d>] ? dput+0xad/0x180
[   16.494358]  [<ffffffff811e13e4>] ? mntput+0x24/0x40
[   16.499942]  [<ffffffff811c2cfe>] ? __fput+0x17e/0x260
[   16.505713]  [<ffffffff81614ba2>] __sys_sendmsg+0x42/0x80
[   16.511782]  [<ffffffff81614bf2>] SyS_sendmsg+0x12/0x20
[   16.517659]  [<ffffffff8173a4dd>] system_call_fastpath+0x1a/0x1f
[   16.524396] Code: 00 00 85 ff 0f 84 37 ff ff ff 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d c3 0f 1f 00 48 8b 9b 40 01 00 00 4d 8b a4 24 40 01 00 00 <48> 8b bb 48 01 00 00 49 3b bc 24 48 01 00 00 75 e0 44 89 45 d0
[   16.546779] RIP  [<ffffffff810a69f7>] check_preempt_wakeup+0x137/0x270
[   16.554113]  RSP <ffff881fd2aad9e8>
[   16.558035] CR2: 0000000000000148
[   16.561769] ---[ end trace d66b8aa0c23f3c89 ]---

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https://bugs.launchpad.net/bugs/1592597

Title:
  3.13.0-88-generic:amd64 fails to boot on Dell PowerEdge R630

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Trusty:
  Incomplete

Bug description:
  Following recent update to 3.13.0-88, R630 on Trusty panics on boot.
  Recovery boot just hangs.  3.13.0-87 was able to be booted normally
  once, then kernel panics on subsequent attempts.  Booting is
  successful with the previously running kernel, 3.13.0-61.

  will upload an sosreport.

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