Hi Ingo,
On Sun, 2 Sep 2007, Ingo Molnar wrote:
>
> Thanks! Not sure how that bug slipped in, in my tree it does this:
>
> + struct pt_regs *regs;
> ...
> + regs = get_irq_regs();
You're very right indeed -- this bit was absent from -rc4-mm1's
softlockup-improve-debug-output.patch but now that I looked at your
original patch at http://lkml.org/lkml/2007/7/17/180, it becomes
obvious this was simply a mismerge issue after all :-)
[ Andrew, feel free to ignore my patch in case you just resolve
the mismerge by yourself. ]
BTW would something similar would be useful in __schedule_bug() too?
I sure think so -- I'm not sure if EIP holds anything useful there,
but CPU#, EFLAGS and the init_utsname() stuff would be definitely
helpful ...
[PATCH] sched: Use show_regs() to improve __schedule_bug() output
A full register dump along with stack backtrace would make the "scheduling
while atomic" message more helpful. Use show_regs() instead of dump_stack()
for this. We already know we're atomic in here (that is why this function
was called) so show_regs()'s atomicity expectations are guaranteed.
Also, modify the output of the "BUG: scheduling while atomic:" header a bit
to keep task->comm and task->pid together and preempt_count() after them.
Signed-off-by: Satyam Sharma <[email protected]>
---
kernel/sched.c | 14 +++++++++++---
1 files changed, 11 insertions(+), 3 deletions(-)
diff --git a/kernel/sched.c b/kernel/sched.c
index b533d6d..4fb07c1 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -63,6 +63,7 @@
#include <linux/unistd.h>
#include <asm/tlb.h>
+#include <asm/irq_regs.h>
/*
* Scheduler clock - returns current time in nanosec units.
@@ -3404,12 +3405,19 @@ EXPORT_SYMBOL(sub_preempt_count);
*/
static noinline void __schedule_bug(struct task_struct *prev)
{
- printk(KERN_ERR "BUG: scheduling while atomic: %s/0x%08x/%d\n",
- prev->comm, preempt_count(), prev->pid);
+ struct pt_regs *regs = get_irq_regs();
+
+ printk(KERN_ERR "BUG: scheduling while atomic: %s/%d/0x%08x\n",
+ prev->comm, prev->pid, preempt_count());
+
debug_show_held_locks(prev);
if (irqs_disabled())
print_irqtrace_events(prev);
- dump_stack();
+
+ if (regs)
+ show_regs(regs);
+ else
+ dump_stack();
}
/*
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
