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 0008
[ 109.592071] pgd = c0004000
[ 109.594879] [0008] *pgd=
[ 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: 0Tainted: 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: 6113
[ 109.643737] sp : c079bfd0 ip : 00773612 fp :
[ 109.655700] r10: r9 : 411fc092 r8 : 80034680
[ 109.661163] r7 : c07ab0cc r6 : c003702c r5 : r4 : c079a000
[ 109.667938] r3 : r2 : r1 : r0 : c0037030
[ 109.674743] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment
kernel
[ 109.682373] Control: 10c53c7d Table: a6fc804a DAC: 0015
[ 109.688354] Process swapper (pid: 0, stack limit = 0xc079a2f8)
[ 109.694427] Stack: (0xc079bfd0 to 0xc079c000)
[ 109.698974] bfc0: c0853844 c0008c98
c0008f00
[ 109.707489] bfe0: 271beb3f c0037030 10c53c7d c07f5ae0 80008080
[ 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 []
(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
c079a000
[ 109.825775] bfa0: c003702c c07ab0cc 80034680 411fc092
00773612 c079bfd0
[ 109.834655] bfc0: c0045270 c0445288 6113
[ 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 []
(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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