2.6.17-rt1 : x86_64 oops
From: Dipankar Sarma
Date: Tue Jun 27 2006 - 16:52:06 EST
I used the attached patch below to work around the already known
compilation problem and a bunch of warnings in slab.c. In my
4-way x86_64 box, I get a few oops and then the machine panics.
Starting udevd
Creating devices
BUG: scheduling while atomic: udevd/0x00000001/1875
BUG: scheduling while atomic: swapper/0x00000001/0
Call Trace:
<ffffffff804fcd76>{__schedule+158}
<ffffffff804ffcdf>{_raw_spin_unlock_irqrestore+48}
<ffffffff8024998b>{task_blocks_on_rt_mutex+518}
<ffffffff80502986>{kprobe_flush_task+21}
<ffffffff80502986>{kprobe_flush_task+21}
<ffffffff804fdf0d>{schedule+236}
<ffffffff804fedb3>{rt_lock_slowlock+327}
<ffffffff80502986>{kprobe_flush_task+21}
<ffffffff804fdc57>{thread_return+177}
<ffffffff80208968>{mwait_idle+0}
<ffffffff80208958>{cpu_idle+232}
<ffffffff80217108>{start_secondary+1102}
---------------------------
| preempt count: 00000001 ]
| 1-level deep critical section nesting:
----------------------------------------
.. [<ffffffff804fcd8e>] .... __schedule+0xb6/0xece
.....[<00000000>] .. ( <= 0x0)
BUG: scheduling from the idle thread!
Call Trace:
<ffffffff804fcde5>{__schedule+269}
<ffffffff804ffcdf>{_raw_spin_unlock_irqrestore+48}
<ffffffff8024998b>{task_blocks_on_rt_mutex+518}
<ffffffff80502986>{kprobe_flush_task+21}
<ffffffff80502986>{kprobe_flush_task+21}
<ffffffff804fdf0d>{schedule+236}
<ffffffff804fedb3>{rt_lock_slowlock+327}
<ffffffff80502986>{kprobe_flush_task+21}
<ffffffff804fdc57>{thread_return+177}
<ffffffff80208968>{mwait_idle+0}
<ffffffff80208958>{cpu_idle+232}
<ffffffff80217108>{start_secondary+1102}
---------------------------
| preempt count: 00000002 ]
| 2-level deep critical section nesting:
----------------------------------------
Unable to handle kernel NULL pointer dereference at 0000000000000008 RIP:
<ffffffff8022739c>{dequeue_task+13}
PGD 21dfe2067 PUD 21d036067 PMD 0
Oops: 0002 [1] PREEMPT SMP
CPU 3
Modules linked in:
Pid: 0, comm: swapper Not tainted 2.6.17-rt1 #2
RIP: 0010:[<ffffffff8022739c>] <ffffffff8022739c>{dequeue_task+13}
RSP: 0000:ffff81022083bc30 EFLAGS: 00010086
RAX: ffff810084af6000 RBX: ffff810220834580 RCX: ffff8102208345b8
RDX: ffffffff807b1718 RSI: 0000000000000000 RDI: ffff810220834580
RBP: ffff81022083bc40 R08: 00000000ffffffff R09: ffff81022083b8a0
R10: 0000000000000001 R11: ffffffff8024aec4 R12: 0000000000000000
R13: ffffffff80502986 R14: ffff8100052a5600 R15: 0000000000000020
FS: 0000000000000000(0000) GS:ffff81022080cc40(0000) knlGS:0000000000000000
CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
CR2: 0000000000000008 CR3: 000000021dbad000 CR4: 00000000000006e0
Process swapper (pid: 0, threadinfo ffff81022083a000, task ffff810220834580)
Stack: ffff81022083bd30 ffff810220834580 ffff81022083bc60 ffffffff80227433
ffff81022083bd30 0000000010000040 ffff81022083bd30 ffffffff804fcf09
ffffffff806c1036 ffffffff806c1020
Call Trace:
<ffffffff80227433>{deactivate_task+25}
<ffffffff804fcf09>{__schedule+561}
<ffffffff804ffcdf>{_raw_spin_unlock_irqrestore+48}
<ffffffff8024998b>{task_blocks_on_rt_mutex+518}
<ffffffff80502986>{kprobe_flush_task+21}
<ffffffff80502986>{kprobe_flush_task+21}
<ffffffff804fdf0d>{schedule+236}
<ffffffff804fedb3>{rt_lock_slowlock+327}
<ffffffff80502986>{kprobe_flush_task+21}
<ffffffff804fdc57>{thread_return+177}
<ffffffff80208968>{mwait_idle+0}
<ffffffff80208958>{cpu_idle+232}
<ffffffff80217108>{start_secondary+1102}
---------------------------
| preempt count: 00000004 ]
| 4-level deep critical section nesting:
----------------------------------------
I am digging to see what is causing this, just a heads up.
The compilation and warning fix patch is below.
Thanks
Dipankar
Fix a compilation error in numa slab code. Also fixes warnings
due to slab_irq_disable().
Signed-off-by: Dipankar Sarma <dipankar@xxxxxxxxxx>
---
diff -puN mm/slab.c~fix-slab-numa mm/slab.c
--- linux-2.6.17-rt1-rcu/mm/slab.c~fix-slab-numa 2006-06-27 15:26:38.000000000 +0530
+++ linux-2.6.17-rt1-rcu-dipankar/mm/slab.c 2006-06-27 18:45:32.000000000 +0530
@@ -149,7 +149,8 @@
do { spin_unlock_irqrestore(lock, flags); } while (0)
#else
DEFINE_PER_CPU_LOCKED(int, slab_irq_locks) = { 0, };
-# define slab_irq_disable(cpu) get_cpu_var_locked(slab_irq_locks, &(cpu))
+# define slab_irq_disable(cpu) ({get_cpu_var_locked(slab_irq_locks, &(cpu));})
+
# define slab_irq_enable(cpu) put_cpu_var_locked(slab_irq_locks, cpu)
# define slab_irq_save(flags, cpu) \
do { slab_irq_disable(cpu); (void) (flags); } while (0)
@@ -3243,14 +3244,15 @@ __cache_free(struct kmem_cache *cachep,
if (unlikely(alien->avail == alien->limit)) {
STATS_INC_ACOVERFLOW(cachep);
__drain_alien_cache(cachep,
- alien, nodeid);
+ alien, nodeid,
+ this_cpu);
}
alien->entry[alien->avail++] = objp;
spin_unlock(&alien->lock);
} else {
spin_lock(&(cachep->nodelists[nodeid])->
list_lock);
- free_block(cachep, &objp, 1, nodeid);
+ free_block(cachep, &objp, 1, nodeid, this_cpu);
spin_unlock(&(cachep->nodelists[nodeid])->
list_lock);
}
diff -puN include/linux/spinlock_api_smp.h~fix-slab-numa include/linux/spinlock_api_smp.h
--- linux-2.6.17-rt1-rcu/include/linux/spinlock_api_smp.h~fix-slab-numa 2006-06-27 16:37:39.000000000 +0530
+++ linux-2.6.17-rt1-rcu-dipankar/include/linux/spinlock_api_smp.h 2006-06-27 16:38:46.000000000 +0530
@@ -37,6 +37,7 @@ unsigned long __lockfunc _raw_write_lock
int __lockfunc _raw_spin_trylock(raw_spinlock_t *lock);
int __lockfunc _raw_read_trylock(raw_rwlock_t *lock);
int __lockfunc _raw_write_trylock(raw_rwlock_t *lock);
+int __lockfunc _raw_spin_trylock_irq(raw_spinlock_t *lock);
int __lockfunc _raw_spin_trylock_irqsave(raw_spinlock_t *lock,
unsigned long *flags);
int __lockfunc _raw_spin_trylock_bh(raw_spinlock_t *lock);
_
-
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