http://bugzilla.kernel.org/show_bug.cgi?id=9747
Summary: Oops on boot from laptop mode writing to
/proc/acpi/processor/CPU0/throttling
Product: ACPI
Version: 2.5
KernelVersion: 2.6.24-rc7
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Config-Processors
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
Latest working kernel version: Unsure. Later than 2.6.24-rc2
Earliest failing kernel version: 2.6.24-rc6 (possibly earlier)
Distribution: Debian
Hardware Environment: Toshiba Portege r500
Software Environment:
Problem Description:
When I boot laptop-mode fires up and tries to write to
/proc/acpi/processor/CPU0/throttling which contains <not supported>
I don't quite know what I've done to get it to contain <not supported> but
anyway that'll be more fun to track down I'm sure.
In any case, in this configuration I get this oops even if all I do is
echo stuff >/proc/acpi/processor/CPU0/throttling
[ 32.378673] Unable to handle kernel NULL pointer dereference at
0000000000000
000 RIP:
[ 32.378761] [<0000000000000000>] _stext+0x7fdf7000/0x1a
[ 32.378965] PGD 37bb3067 PUD 37b2a067 PMD 0
[ 32.379182] Oops: 0010 [1] SMP
[ 32.379350] CPU 0
[ 32.379466] Modules linked in: rfcomm l2cap bluetooth acpi_cpufreq
cpufreq_st
ats cpufreq_userspace cpufreq_powersave cpufreq_ondemand freq_table sg sr_mod
cd
rom loop arc4 ecb blkcipher snd_hda_intel snd_pcm_oss snd_pcm snd_mixer_oss
snd_
seq_dummy pcmcia snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event
iwl4965
snd_seq firmware_class sdhci snd_timer snd_seq_device mmc_core mac80211
yenta_s
ocket rsrc_nonstatic pcmcia_core snd psmouse soundcore cfg80211 snd_page_alloc
i
ntel_agp battery ac button evdev usb_storage ext3 jbd mbcache dm_mirror
dm_snaps
hot dm_mod ehci_hcd uhci_hcd e1000 sd_mod thermal processor fan
[ 32.382717] Pid: 3267, comm: laptop_mode Not tainted 2.6.24-rc7 #1
[ 32.382797] RIP: 0010:[<0000000000000000>] [<0000000000000000>]
_stext+0x7fd
f7000/0x1a
[ 32.382948] RSP: 0018:ffff81007b84de80 EFLAGS: 00010296
[ 32.383027] RAX: 0000000000000000 RBX: ffff81007d8c7800 RCX:
0000000000000000
[ 32.383110] RDX: ffff8100826b9000 RSI: 0000000000000000 RDI:
ffff81007d8c7800
[ 32.383193] RBP: fffffffffffffffb R08: 000000000000002d R09:
0000000000000000
[ 32.383276] R10: 740174016f017201 R11: ffffffff802d03ef R12:
0000000000000000
[ 32.383359] R13: 0000000000000003 R14: 0000000000000003 R15:
00000000005c5808
[ 32.383442] FS: 00002b6898b11dc0(0000) GS:ffffffff804cd000(0000)
knlGS:0000000000000000
[ 32.383545] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 32.383625] CR2: 0000000000000000 CR3: 000000007ba46000 CR4:
00000000000006e0
[ 32.383707] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[ 32.383790] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
0000000000000400
[ 32.383873] Process laptop_mode (pid: 3267, threadinfo ffff81007b84c000,
task ffff81007ba40040)
[ 32.383977] Stack: ffffffff88003c3d 0000000000000003 ffff81007d8c7800
ffff81007b84df50
[ 32.384314] ffffffff88003e43 00000000000a312d ffff810000000000
ffff81007d897cc0
[ 32.384603] fffffffffffffffb ffff81007ba57540 ffffffff802b717d
ffff81007ba57780
[ 32.384829] Call Trace:
[ 32.384973] [<ffffffff88003c3d>]
:processor:acpi_processor_set_throttling+0x37/0x52
[ 32.385083] [<ffffffff88003e43>]
:processor:acpi_processor_write_throttling+0x61/0x74
[ 32.385191] [<ffffffff802b717d>] proc_reg_write+0x7e/0x99
[ 32.385273] [<ffffffff8028205f>] vfs_write+0xc6/0x14f
[ 32.385354] [<ffffffff802825ad>] sys_write+0x45/0x6e
[ 32.385435] [<ffffffff8020beee>] system_call+0x7e/0x83
[ 32.385517]
[ 32.385585]
[ 32.385585] Code: Bad RIP value.
[ 32.385819] RIP [<0000000000000000>] _stext+0x7fdf7000/0x1a
[ 32.385947] RSP <ffff81007b84de80>
[ 32.386020] CR2: 0000000000000000
[ 32.386109] ---[ end trace 2ded1a5f4094ec80 ]---
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