Re: kernel bug (null pointer) in 2.6.27-rc1

[Ryan Hope]

This patch fixes this issue, it fixed it for me:

diff --git a/kernel/sched.c b/kernel/sched.c
index 3ba1199..d757da7 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -7713,35 +7713,34 @@ static ssize_t sched_power_savings_store(const
char *buf, size_t count, int smt)
 }

 #ifdef CONFIG_SCHED_MC
-static ssize_t sched_mc_power_savings_show(struct sys_device *dev,
-				struct sysdev_attribute *attr, char *page)
+static ssize_t sched_mc_power_savings_show(struct sysdev_class *class,
+                                            char *page)
 {
 	return sprintf(page, "%u\n", sched_mc_power_savings);
 }
-static ssize_t sched_mc_power_savings_store(struct sys_device *dev,
-					    struct sysdev_attribute *attr,
+static ssize_t sched_mc_power_savings_store(struct sysdev_class *class,
 					    const char *buf, size_t count)
 {
 	return sched_power_savings_store(buf, count, 0);
 }
-static SYSDEV_ATTR(sched_mc_power_savings, 0644, sched_mc_power_savings_show,
-		   sched_mc_power_savings_store);
+static SYSDEV_CLASS_ATTR(sched_mc_power_savings, 0644,
+                          sched_mc_power_savings_show,
+                          sched_mc_power_savings_store);
 #endif

 #ifdef CONFIG_SCHED_SMT
-static ssize_t sched_smt_power_savings_show(struct sys_device *dev,
-				struct sysdev_attribute *attr, char *page)
+static ssize_t sched_smt_power_savings_show(struct sysdev_class *dev,
+                                             char *page)
 {
 	return sprintf(page, "%u\n", sched_smt_power_savings);
 }
-static ssize_t sched_smt_power_savings_store(struct sys_device *dev,
-					     struct sysdev_attribute *attr,
+static ssize_t sched_smt_power_savings_store(struct sysdev_class *dev,
 					     const char *buf, size_t count)
 {
 	return sched_power_savings_store(buf, count, 1);
 }
-static SYSDEV_ATTR(sched_smt_power_savings, 0644, sched_smt_power_savings_show,
-		   sched_smt_power_savings_store);
+static SYSDEV_CLASS_ATTR(sched_smt_power_savings, 0644,
+                    sched_smt_power_savings_show,
 #endif

 int sched_create_sysfs_power_savings_entries(struct sysdev_class *cls)

On Tue, Jul 29, 2008 at 5:54 PM, Norbert Preining <preining@xxxxxxxx> wrote:
> Hi all,
>
> (pleace Cc)
>
> Got that just now ...
>
> BUG: unable to handle kernel NULL pointer dereference at 00000002
> IP: [<c011bad5>] sched_mc_power_savings_store+0x0/0x2c
> *pde = 00000000
> Oops: 0000 [#1] PREEMPT SMP
> Modules linked in: binfmt_misc nls_utf8 fuse dm_crypt dm_mod kvm_intel kvm coretemp tifm_7xx1 gspca_vc032x tifm_core gspca_main nsc_ircc joydev iwl3945 videodev v4l1_compat rfkill mac80211 irda crc_ccitt firewire_ohci firewire_core crc_itu_t
>
> Pid: 4144, comm: sched-powersave Not tainted (2.6.27-rc1 #1)
> EIP: 0060:[<c011bad5>] EFLAGS: 00010282 CPU: 0
> EIP is at sched_mc_power_savings_store+0x0/0x2c
> EAX: c0434498 EBX: c011bad5 ECX: 00000002 EDX: e9135000
> ESI: c04344bc EDI: e9135000 EBP: c04344bc ESP: e9133f48
>  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
> Process sched-powersave (pid: 4144, ti=e9132000 task=f7934810 task.ti=e9132000)
> Stack: c02300db c04341f8 f781fd1c f7e25400 c0195442 00000002 0849e408 e90784c0
>       f7e25414 c04341f8 00000002 e90784c0 c0195392 0849e408 c016433a e9133fa0
>       e90784c0 fffffff7 0849e408 e9132000 c016442a e9133fa0 00000000 00000000
> Call Trace:
>  [<c02300db>] sysdev_class_store+0x1e/0x22
>  [<c0195442>] sysfs_write_file+0xb0/0xdd
>  [<c0195392>] sysfs_write_file+0x0/0xdd
>  [<c016433a>] vfs_write+0x7e/0xd6
>  [<c016442a>] sys_write+0x3c/0x63
>  [<c0102dfe>] syscall_call+0x7/0xb
>  [<c0350000>] tg3_init_one+0xaf2/0x1010
>  =======================
> Code: c0 c3 31 c0 31 c9 31 d2 e8 bb fd ff ff b8 01 00 00 00 c3 e8 ce 4d 00 00 31 c0 31 c9 31 d2 e8 a5 fd ff ff e8 22 4f 00 00 31 c0 c3 <8a> 09 ba ea ff ff ff 8d 41 d0 3c 01 77 1b 31 c0 80 f9 31 0f 94
> EIP: [<c011bad5>] sched_mc_power_savings_store+0x0/0x2c SS:ESP 0068:e9133f48
> ---[ end trace f43d02115764e57e ]---
>
>
> kernel config and all other if one needs it.
>
> Best wishes
>
> Norbert
>
> -------------------------------------------------------------------------------
> Dr. Norbert Preining <preining@xxxxxxxx>        Vienna University of Technology
> Debian Developer <preining@xxxxxxxxxx>                         Debian TeX Group
> gpg DSA: 0x09C5B094      fp: 14DF 2E6C 0307 BE6D AD76  A9C0 D2BF 4AA3 09C5 B094
> -------------------------------------------------------------------------------
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