Messages in this thread | | | Subject | 2.6.31-rc3 cpufreq bug (null pointer dereference) | From | Christophe Lermytte <> | Date | Tue, 21 Jul 2009 22:07:49 +0200 |
| |
Today, I tried to change the governor to conservative using the GNOME cpufreqd applet. The applet subsequently hangs and the following appears in the kernel traces:
[ 3067.249054] BUG: unable to handle kernel NULL pointer dereference at 00000020 [ 3067.249062] IP: [<c1302d23>] dbs_cpufreq_notifier+0x17/0x2b [ 3067.249074] *pde = 00000000 [ 3067.249078] Oops: 0000 [#1] SMP [ 3067.249083] last sysfs file: /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor [ 3067.249087] Modules linked in: cdc_wdm cdc_acm [ 3067.249093] [ 3067.249098] Pid: 1346, comm: kondemand/1 Not tainted (2.6.31-rc3 #2) Latitude D630 [ 3067.249103] EIP: 0060:[<c1302d23>] EFLAGS: 00010286 CPU: 1 [ 3067.249108] EIP is at dbs_cpufreq_notifier+0x17/0x2b [ 3067.249112] EAX: 00000000 EBX: f6959f00 ECX: 00000000 EDX: c278c300 [ 3067.249116] ESI: fffffffe EDI: 00000000 EBP: 00000000 ESP: f6959e78 [ 3067.249120] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 [ 3067.249124] Process kondemand/1 (pid: 1346, ti=f6958000 task=f69020a0 task.ti=f6958000) [ 3067.249128] Stack: [ 3067.249130] c161ba54 c1427067 f6959f00 00000000 c176d000 f6959f00 c176cfe4 00000000 [ 3067.249139] <0> c103a57e ffffffff 00000000 00000000 00000001 f64de590 f8416980 f6959f00 [ 3067.249149] <0> c103a59c ffffffff 00000000 c100f8b0 f6bcf240 ffffffea 00000003 00000000 [ 3067.249160] Call Trace: [ 3067.249166] [<c1427067>] ? notifier_call_chain+0x2a/0x47 [ 3067.249175] [<c103a57e>] ? __srcu_notifier_call_chain+0x32/0x47 [ 3067.249181] [<c103a59c>] ? srcu_notifier_call_chain+0x9/0xc [ 3067.249193] [<c100f8b0>] ? acpi_cpufreq_target+0x1a7/0x2b1 [ 3067.249197] [<c100f5ba>] ? get_measured_perf+0x1f/0x140 [ 3067.249201] [<c103db6d>] ? getnstimeofday+0x4d/0xd0 [ 3067.249205] [<c1300802>] ? cpufreq_register_driver+0xb1/0x15b [ 3067.249209] [<c100f709>] ? acpi_cpufreq_target+0x0/0x2b1 [ 3067.249213] [<c13008f5>] ? __cpufreq_driver_target+0x49/0x55 [ 3067.249217] [<c13029a0>] ? do_dbs_timer+0x262/0x2b8 [ 3067.249222] [<c1033b50>] ? worker_thread+0x137/0x1b3 [ 3067.249226] [<c130273e>] ? do_dbs_timer+0x0/0x2b8 [ 3067.249229] [<c1037042>] ? autoremove_wake_function+0x0/0x2d [ 3067.249233] [<c1033a19>] ? worker_thread+0x0/0x1b3 [ 3067.249236] [<c1036da6>] ? kthread+0x69/0x6e [ 3067.249240] [<c1036d3d>] ? kthread+0x0/0x6e [ 3067.249244] [<c100334f>] ? kernel_thread_helper+0x7/0x10 [ 3067.249246] Code: c7 44 24 18 ea ff ff ff 8b 44 24 18 83 c4 20 5b 5e 5f 5d c3 53 8b 01 ba 00 83 6c c1 89 cb 03 14 85 6c b9 66 c1 8b 4a 18 8b 42 60 <3b> 41 20 77 05 3b 41 1c 73 06 8b 43 08 89 42 60 31 c0 5b c3 53 [ 3067.249282] EIP: [<c1302d23>] dbs_cpufreq_notifier+0x17/0x2b SS:ESP 0068:f6959e78 [ 3067.249287] CR2: 0000000000000020 [ 3067.249296] ---[ end trace 5cb870966b6883a7 ]---
If you need more info, please let me now.
Regards, Christophe Lermytte
| |