On Wed, 28 Jun 2006 14:03:33 +0200
"Rafael J. Wysocki" <[email protected]> wrote:
> On Tuesday 27 June 2006 10:52, Andrew Morton wrote:
> >
> > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.17/2.6.17-mm3/
>
> I have three problems with this kernel.
>
> First, there's a mutex lock warning as in the appended trace and my USB
> mouse doesn't work.
>
> Second, kpowersave is apparently unable to get the battery status,
> although the data in /proc/acpi/battery/BAT0/ seem to be correct
> (this also happened with 2.6.17-mm2, but it did not happen with
> 2.6.17-rc6-mm2).
>
> Finally, I'm still seeing slab corruptions in dmesg (eg. at the end of the
> appended trace).
>
> Greetings,
> Rafael
>
>
> usbdev2.4_ep81: ep_device_release called for usbdev2.4_ep81
> BUG: warning at kernel/mutex.c:132/__mutex_lock_common()
>
> Call Trace:
> [<ffffffff8020ab6f>] show_trace+0x9f/0x240
> [<ffffffff8020af45>] dump_stack+0x15/0x20
> [<ffffffff8047296b>] __mutex_lock_slowpath+0xab/0x280
> [<ffffffff80472b49>] mutex_lock+0x9/0x10
> [<ffffffff803ed909>] input_unregister_device+0x109/0x160
> [<ffffffff88157ab2>] :usbhid:hidinput_disconnect+0x72/0xa0
> [<ffffffff88153d3d>] :usbhid:hid_disconnect+0x9d/0x110
> [<ffffffff803dd85b>] usb_unbind_interface+0x5b/0xb0
> [<ffffffff803bb03d>] __device_release_driver+0x8d/0xb0
> [<ffffffff803bb324>] device_release_driver+0x34/0x50
> [<ffffffff803ba6af>] bus_remove_device+0xaf/0xe0
> [<ffffffff803b9067>] device_del+0x157/0x1a0
> [<ffffffff803dc548>] usb_disable_device+0x108/0x1a0
> [<ffffffff803d44e2>] usb_disconnect+0xd2/0x150
> [<ffffffff803d7c0f>] hub_thread+0x63f/0xff0
> [<ffffffff802435c9>] kthread+0xd9/0x110
> [<ffffffff8020a34a>] child_rip+0x8/0x12
I assume that is the second warning here:
#define spin_lock_mutex(lock, flags) \
do { \
struct mutex *l = container_of(lock, struct mutex, wait_lock); \
\
DEBUG_LOCKS_WARN_ON(in_interrupt()); \
local_irq_save(flags); \
__raw_spin_lock(&(lock)->raw_lock); \
DEBUG_LOCKS_WARN_ON(l->magic != l); \
} while (0)
(it's a bit awkward that both warnings are at the same line number).
This looks like the bug which Linus has been chasing. iirc, that's
half-fixed now.
> <3>Slab corruption: start=ffff810057d41000, len=4096
> 7e0: 6b 6b 6b 6b 6b 6b 6b 6b 00 00 00 00 6b 6b 6b 6b
> 8a0: 6b 6b 6b 6b 6b 6b 6b 6b 58 3b e8 37 00 81 ff ff
This might fix, not sure..
--- a/lib/vsprintf.c~vsnprintf-fix
+++ a/lib/vsprintf.c
@@ -259,7 +259,9 @@ int vsnprintf(char *buf, size_t size, co
int len;
unsigned long long num;
int i, base;
- char *str, *end, c;
+ char *str; /* Where we're writing to */
+ char *end; /* The last byte we can write to */
+ char c;
const char *s;
int flags; /* flags to number() */
@@ -283,12 +285,12 @@ int vsnprintf(char *buf, size_t size, co
}
str = buf;
- end = buf + size;
+ end = buf + size - 1;
/* Make sure end is always >= buf */
- if (end < buf) {
+ if (end < buf - 1) {
end = ((void *)-1);
- size = end - buf;
+ size = end - buf + 1;
}
for (; *fmt ; ++fmt) {
@@ -494,7 +496,6 @@ int vsnprintf(char *buf, size_t size, co
/* the trailing null byte doesn't count towards the total */
return str-buf;
}
-
EXPORT_SYMBOL(vsnprintf);
/**
_
-
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