Andrew Morton wrote:
Petr Vandrovec <[email protected]> wrote:
Andrew Morton wrote:
Petr Vandrovec <[email protected]> wrote:
Andrew Morton wrote:
Petr Vandrovec <[email protected]> wrote:
so now once crashes on UP system were sorted out, I tried to
put new kernel on my SMP host - and sorry to say, but it does not
seem to work as advertised :-(
.config (again), please.
Any SMP with NUMA. One which I'm trying to debug now is attached.
It is available at http://vana.vc.cvut.cz/config as well.
I can get 2.6.14-rc1 to crash with your .config, but current -linus is OK.
It still dies for me, with current git (tree 7513cdadc661cfe0bd1625145a4876e54df191ca,
commit 6c0741fbdee5bd0f8ed13ac287c4ab18e8ba7d83). Config is available at
http://platan.vc.cvut.cz/config-vana.txt. Box is dual opteron Tyan K8W, S2885.
...
ide0: BM-DMA at 0xffa0-0xffa7, BIOS settings: hda:DMA, hdb:pio
ide1: BM-DMA at 0xffa8-0xffaf, BIOS settings: hdc:DMA, hdd:pio
----------- [cut here ] --------- [please bite here ] ---------
Kernel BUG at mm/slab.c:1849
invalid operand: 0000 [1] SMP
CPU 0
Modules linked in:
Pid: 8, comm: events/0 Not tainted 2.6.14-rc1-6c07 #1
RIP: 0010:[<ffffffff8016d316>] <ffffffff8016d316>{free_block+294}
RSP: 0000:ffff81007ff21d88 EFLAGS: 00010002
RAX: 0000000000000001 RBX: 0000000000000001 RCX: 0000000000000310
RDX: 0000000000000000 RSI: ffff81007ffddd10 RDI: ffff81007ffda080
RBP: ffff81007ffde000 R08: ffff81003ffa0d50 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000000 R12: ffff81007ffc9b50
R13: ffff81007ffde048 R14: ffff81007ffda080 R15: ffff81007ffda080
FS: 0000000000000000(0000) GS:ffffffff805f2800(0000) knlGS:0000000000000000
CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
CR2: 0000000000000000 CR3: 0000000000101000 CR4: 00000000000006e0
Process events/0 (pid: 8, threadinfo ffff81007ff20000, task ffff81003ff8c790)
Stack: 0000000000000000 0000000000000000 0000000000000292 hda: _NEC DVD_RW ND-3500AG, ATAPI CD/DVD-ROM drive
0000000200000000
ffff81007ffddd10 ffff81007ffddd10 ffff81007ffddce8 0000000000000002
0000000000000000 ffff81007ffda080
Call Trace:<ffffffff8016e8b7>{drain_array_locked+167} <ffffffff8016e9f7>{cache_reap+231}
<ffffffff80131e23>{__wake_up+67} <ffffffff8016e910>{cache_reap+0}
<ffffffff8014930c>{worker_thread+476} <ffffffff80131d60>{default_wake_function+0}
<ffffffff80131d60>{default_wake_function+0} <ffffffff80149130>{worker_thread+0}
<ffffffff8014db82>{kthread+146} <ffffffff8010ec22>{child_rip+8}
<ffffffff80149130>{worker_thread+0} <ffffffff8014daf0>{kthread+0}
<ffffffff8010ec1a>{child_rip+0}
Code: 0f 0b 68 9d 26 3d 80 c2 39 07 48 89 ee 4c 89 ff 4c 8d 75 30
RIP <ffffffff8016d316>{free_block+294} RSP <ffff81007ff21d88>
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
Well. The CPU_UP_CANCELED locking in cpuup_callback() looks borked to me -
it takes cachep->nodelists[node]->list_lock and then calls
drain_alien_cache() which appears to take the same lock. But that's not
the problem here.
The code in cache_reap() recalculates numa_node_id() multiple times, so if
the caller changes CPUs then this assertion will trigger. However it's
running under keventd here, which is pinned to a single CPU. Still, it
would be useful if you could try putting preempt_disable()s in
cache_reap(), or change cache_reap() to evaluate numa_node_id() just the
once, and cache that in a local variable.
I wonder why numa_node_id() uses raw_smp_processor_id()? That's just
asking for preempt non-atomicity bugs.
I've thought that this is problem, but as far as I can tell while this is
problem it does not happen here. Just free_block() finds that pointer it
got from caller belongs to the slab that belongs to the CPU#1/node#1
while caller obtained lock on CPU#0/node#0 structures. Which suggests
that drain_array_locked() was issued with node #0 while array_cache->entry
it got contains blocks which belong to node #1. Which I cannot explain.
Petr
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