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Date: Mon, 28 Jul 2008 14:48:59 -0700
From: Dave Hansen <dave@...ux.vnet.ibm.com>
To: Andi Kleen <andi@...stfloor.org>
Cc: Greg Kroah-Hartman <gregkh@...e.de>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: sched-powersave causes oops on 2.6.26-08037-g8cd362a
This oops just happens on startup for me.
$ uname -a
Linux nimitz 2.6.26-08037-g8cd362a #69 SMP Mon Jul 28 14:12:00 PDT 2008 i686 GNU/Linux
$ addr2line -e vmlinux c0126866
linux-2.6.git/kernel/sched.c:7660
static ssize_t sched_power_savings_store(const char *buf, size_t count, int smt)
{
int ret;
HERE--> if (buf[0] != '0' && buf[0] != '1')
return -EINVAL;
if (smt)
sched_smt_power_savings = (buf[0] == '1');
else
sched_mc_power_savings = (buf[0] == '1');
ret = arch_reinit_sched_domains();
return ret ? ret : count;
}
Looks to me like someone managed to get a null 'buf' into there.
Although, it is a bit odd that the actual deref is at 00000002.
I'm assuming that this is coming from: 4a0b2b4dbe1335b8b9886ba3dc85a145d5d938ed.
[ 167.635123] mtrr: type mismatch for e0000000,10000000 old: write-back new: write-combining
[ 168.590082] iwl4965 0000:03:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
[ 168.590256] iwl4965 0000:03:00.0: restoring config space at offset 0x1 (was 0x100102, writing 0x40100106)
[ 168.590335] firmware: requesting iwlwifi-4965-2.ucode
[ 168.596984] iwl4965: iwlwifi-4965-2.ucode firmware file req failed: Reason -2
[ 168.611276] iwl4965: Could not read microcode: -2
[ 168.620708] iwl4965 0000:03:00.0: PCI INT A disabled
[ 186.857870] iwl4965 0000:03:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
[ 186.858083] iwl4965 0000:03:00.0: restoring config space at offset 0x1 (was 0x100102, writing 0x40100106)
[ 186.858161] firmware: requesting iwlwifi-4965-2.ucode
[ 186.861756] iwl4965: iwlwifi-4965-2.ucode firmware file req failed: Reason -2
[ 186.876051] iwl4965: Could not read microcode: -2
[ 186.885509] iwl4965 0000:03:00.0: PCI INT A disabled
[ 189.159655] BUG: unable to handle kernel NULL pointer dereference at 00000002
[ 189.171417] IP: [<c0126866>] sched_power_savings_store+0x16/0x60
[ 189.183509] *pdpt = 000000000ac15001 *pde = 0000000000000000
[ 189.183513] Oops: 0000 [#1] SMP
[ 189.188602] Modules linked in: dummy rfcomm l2cap nls_iso8859_1 vfat fat kvm_intel kvm tun ppdev acpi_cpufreq cpufreq_stats cpufreq_ondemand freq_table cpufreq_powersave cpufreq_userspace cpufreq_conservative sbs container sbshc iptable_filter ip_tables x_tables deflate zlib_deflate des_generic cbc aes_generic xcbc sha256_generic sha1_generic af_key dm_crypt dm_mod lp snd_hda_intel snd_pcm_oss snd_pcm joydev snd_mixer_oss arc4 ecb crypto_blkcipher pcmcia snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq iwl4965 snd_timer snd_seq_device yenta_socket iwlcore rsrc_nonstatic usb_storage snd usbhid thinkpad_acpi mac80211 hid libusual psmouse rfkill parport_pc pcmcia_core video led_class soundcore parport serio_raw cfg80211 evdev button snd_page_alloc nvram ohci1394 ieee1394 ehci_hcd uhci_hcd usbcore thermal processor fan fuse
[ 189.188602]
[ 189.188602] Pid: 7113, comm: sched-powersave Not tainted (2.6.26-08037-g8cd362a #69)
[ 189.188602] EIP: 0060:[<c0126866>] EFLAGS: 00010292 CPU: 0
[ 189.188602] EIP is at sched_power_savings_store+0x16/0x60
[ 189.188602] EAX: 00000002 EBX: 00000000 ECX: ffffffea EDX: c04b73f8
[ 189.188602] ESI: c04b73f8 EDI: cac49000 EBP: cac7bf24 ESP: cac7bf1c
[ 189.188602] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
[ 189.188602] Process sched-powersave (pid: 7113, ti=cac7b000 task=cac8b000 task.ti=cac7b000)
[ 189.188602] Stack: c01268d0 c04b7704 cac7bf2c c01268df cac7bf40 c02a1ddb c04b73f8 f6c0b6f0
[ 189.188602] c04b7704 cac7bf6c c01d530b 00000002 080fc408 cb729800 cd84bc54 00000002
[ 189.188602] c04b73f8 cb729800 080fc408 00000002 cac7bf90 c018dba6 cac7bf9c cb729800
[ 189.188602] Call Trace:
[ 189.188602] [<c01268d0>] ? sched_mc_power_savings_store+0x0/0x20
[ 189.188602] [<c01268df>] ? sched_mc_power_savings_store+0xf/0x20
[ 189.188602] [<c02a1ddb>] ? sysdev_class_store+0x2b/0x40
[ 189.188602] [<c01d530b>] ? sysfs_write_file+0xbb/0x110
[ 189.188602] [<c018dba6>] ? vfs_write+0x96/0x130
[ 189.188602] [<c01d5250>] ? sysfs_write_file+0x0/0x110
[ 189.188602] [<c018e0cd>] ? sys_write+0x3d/0x70
[ 189.188602] [<c0103d3f>] ? sysenter_do_call+0x12/0x33
[ 189.188602] [<c0380000>] ? pci_bus_assign_resources+0x220/0x4c6
[ 189.188602] =======================
[ 189.188602] Code: c9 31 d2 e8 6d fd ff ff e8 58 61 00 00 31 c0 5d c3 8d 74 26 00 55 89 e5 83 ec 08 89 1c 24 89 cb b9 ea ff ff ff 89 74 24 04 89 d6 <0f> b6 10 8d 42 d0 3c 01 76 10 8b 1c 24 89 c8 8b 74 24 04 89 ec
[ 189.188602] EIP: [<c0126866>] sched_power_savings_store+0x16/0x60 SS:ESP 0068:cac7bf1c
[ 189.643173] ---[ end trace 9d31c0bef6b8b1a8 ]---
-- Dave
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