Public bug reported:
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)
** Affects: linux-ti-omap4 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/707003
Title:
Kernel panic when trying to offline CPU1
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