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[Tim Gardner <tim.gardner@xxxxxxxxxxxxx>]

** Also affects: linux-ti-omap4 (Ubuntu Maverick)
   Importance: Undecided
       Status: New

** Also affects: linux-ti-omap4 (Ubuntu Natty)
   Importance: Medium
     Assignee: Paolo Pisati (p-pisati)
       Status: In Progress

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https://bugs.launchpad.net/bugs/707003

Title:
  Kernel panic when trying to offline CPU1

Status in “linux-ti-omap4” package in Ubuntu:
  In Progress
Status in “linux-ti-omap4” source package in Maverick:
  New
Status in “linux-ti-omap4” source package in Natty:
  In Progress

Bug description:
  Running Maverick with the kernel from the TI OMAP trunk PPA (linux-ti-
  omap4 2.6.35-980.1release9), there is a kernel panic shortly after
  trying to offline CPU1:

  $ echo 0 | sudo tee /sys/devices/system/cpu/cpu1/online

  -->

  [  109.583618] Unable to handle kernel NULL pointer dereference at virtual address 00000008
  [  109.592071] pgd = c0004000
  [  109.594879] [00000008] *pgd=00000000
  [  109.598632] Internal error: Oops: 17 [#1] PREEMPT SMP
  [  109.603881] last sysfs file: /sys/devices/system/cpu/cpu1/online
  [  109.610137] Modules linked in: fuse omap_gpu dm_crypt bt_drv(C) st_drv(C) rfcomm tiwlan_drv l2cap sco bluetooth rfkill twl4030_pwrbutton sdio dm_mirror dm_region_hash dm_log btrfs
  [  109.626892] CPU: 0    Tainted: G         C   (2.6.35-980-omap4 #1release9-Ubuntu)
  [  109.634735] PC is at snd_ctl_elem_list+0x180/0x24c
  [  109.639739] LR is at cpu_idle+0x4c/0xd0
  [  109.643737] pc : [<c0445288>]    lr : [<c0045270>]    psr: 60000113
  [  109.643737] sp : c079bfd0  ip : 00773612  fp : 00000000
  [  109.655700] r10: 00000000  r9 : 411fc092  r8 : 80034680
  [  109.661163] r7 : c07ab0cc  r6 : c003702c  r5 : 00000000  r4 : c079a000
  [  109.667938] r3 : 00000000  r2 : 00000000  r1 : 00000000  r0 : c0037030
  [  109.674743] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment kernel
  [  109.682373] Control: 10c53c7d  Table: a6fc804a  DAC: 00000015
  [  109.688354] Process swapper (pid: 0, stack limit = 0xc079a2f8)
  [  109.694427] Stack: (0xc079bfd0 to 0xc079c000)
  [  109.698974] bfc0:                                     c0853844 c0008c98 c0008f00 00000000
  [  109.707489] bfe0: 271beb3f c0037030 00000000 10c53c7d c07f5ae0 80008080 00000000 00000000
  [  109.716033] [<c0445288>] (snd_ctl_elem_list+0x180/0x24c) from [<c009b740>] (run_timer_softirq+0x0/0x224)
  [  109.725921] [<c009b740>] (run_timer_softirq+0x0/0x224) from [<00000000>] (0x0)
  [  109.733459] Code: e3c13d7f e3c3303f e59d0014 e1a02302 (e5933008) 
  [  109.740478] ---[ end trace 3ab1d51f9e4c3baa ]---
  [  109.745300] Kernel panic - not syncing: Attempted to kill the idle task!
  [  109.752319] [<c004a7ac>] (unwind_backtrace+0x0/0xe4) from [<c05829e4>] (panic+0x58/0xe4)
  [  109.760803] [<c05829e4>] (panic+0x58/0xe4) from [<c0090e30>] (do_exit+0x70/0x344)
  [  109.768615] [<c0090e30>] (do_exit+0x70/0x344) from [<c0047b94>] (die+0xe8/0xfc)
  [  109.776245] [<c0047b94>] (die+0xe8/0xfc) from [<c004dd2c>] (__do_kernel_fault+0x64/0x84)
  [  109.784729] [<c004dd2c>] (__do_kernel_fault+0x64/0x84) from [<c0587d50>] (do_page_fault+0x27c/0x2a4)
  [  109.794250] [<c0587d50>] (do_page_fault+0x27c/0x2a4) from [<c00433e8>] (do_DataAbort+0x34/0x98)
  [  109.803344] [<c00433e8>] (do_DataAbort+0x34/0x98) from [<c0585aec>] (__dabt_svc+0x4c/0x60)
  [  109.811950] Exception stack(0xc079bf88 to 0xc079bfd0)
  [  109.817230] bf80:                   c0037030 00000000 00000000 00000000 c079a000 00000000
  [  109.825775] bfa0: c003702c c07ab0cc 80034680 411fc092 00000000 00000000 00773612 c079bfd0
  [  109.834655] bfc0: c0045270 c0445288 60000113 ffffffff
  [  109.839904] [<c0585aec>] (__dabt_svc+0x4c/0x60) from [<c0445288>] (snd_ctl_elem_list+0x180/0x24c)
  [  109.849182] [<c0445288>] (snd_ctl_elem_list+0x180/0x24c) from [<c009b740>] (run_timer_softirq+0x0/0x224)
  [  109.859069] [<c009b740>] (run_timer_softirq+0x0/0x224) from [<00000000>] (0x0)