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Date: Mon, 4 Jun 2012 05:18:47 -0500
From: Robin Holt <holt@....com>
To: Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Ingo Molnar <mingo@...e.hu>
Cc: linux-kernel@...r.kernel.org
Subject: 2048 CPU system panic while sitting idle.
I had a 1024 core / 2048 thread system which had been running aim7 more
than an hour before sitting idle.
###30286.149797 (28156.419861)| BUG: unable to handle kernel NULL pointer dereference at 000000000000008d
30286.169399 ( 0.019602)| IP: [<ffffffff8105f071>] load_balance+0xb0/0xfa2
30286.169515 ( 0.000116)| PGD 0
30286.169547 ( 0.000032)| Oops: 0002 [#1] SMP
30286.169604 ( 0.000057)| xpc : all partitions have deactivated
30286.179717 ( 0.010113)| CPU 1246
30286.179763 ( 0.000046)| Modules linked in:
30286.179812 ( 0.000049)|
30286.179830 ( 0.000018)| Pid: 0, comm: swapper/1246 Not tainted 3.4.0-holt-09547-gfb21aff-dirty #26 Intel Corp. Stoutland Platform
30286.189405 ( 0.009575)| RIP: 0010:[<ffffffff8105f071>] [<ffffffff8105f071>] load_balance+0xb0/0xfa2
30286.199995 ( 0.010590)| RSP: 0018:ffff8b5ffedc3c10 EFLAGS: 00010206
30286.200113 ( 0.000118)| RAX: 00000000000004de RBX: ffff8b5ff8bce400 RCX: 0000000000000012
30286.200260 ( 0.000147)| RDX: ffff8b5ffedd1480 RSI: ffffffff81a7fe7e RDI: ffff88207daabcee
30286.209437 ( 0.009177)| RBP: ffff8b5ffedc3e50 R08: ffff8b5ffedc3e84 R09: ffff8b5ffedc3e38
30286.219981 ( 0.010544)| R10: ffff88203f12be58 R11: 0000000000000010 R12: 0000000000000000
30286.220134 ( 0.000153)| R13: 000000010088ccc1 R14: 0000000000000000 R15: ffff8b5ff8bce400
30286.229418 ( 0.009284)| FS: 0000000000000000(0000) GS:ffff8b5ffedc0000(0000) knlGS:0000000000000000
30286.239960 ( 0.010542)| CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
30286.249945 ( 0.009985)| CR2: 000000000000008d CR3: 0000000001a0b000 CR4: 00000000000007e0
30286.250090 ( 0.000145)| DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
30286.259423 ( 0.009333)| DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
30286.259562 ( 0.000139)| Process swapper/1246 (pid: 0, threadinfo ffff88203f12a000, task ffff88203f128280)
30286.270024 ( 0.010462)| Stack:
30286.270176 ( 0.000152)| ffff8b5ffedc3c20 0000000000011480 0000000000011480 0000000000011480
30286.270335 ( 0.000159)| 0000000000011478 fffffffffffffff8 ffff8b5ffedc3c40 ffff8b5ffedc3c40
30286.309938 ( 0.039603)| ffff8b5ffedc3c70 ffffffff81008f64 00000000000004de ffff8b5ffedd1e80
30286.310090 ( 0.000152)| Call Trace:
30286.310128 ( 0.000038)| <IRQ>
30286.310157 ( 0.000029)| [<ffffffff81008f64>] ? native_sched_clock+0x40/0x8b
30286.310262 ( 0.000105)| [<ffffffff81008fc6>] ? sched_clock+0x17/0x1b
30286.310354 ( 0.000092)| [<ffffffff8105ecea>] ? enqueue_task_fair+0x2a8/0x3f8
30286.310461 ( 0.000107)| [<ffffffff8105bad0>] ? wake_up_process+0x10/0x12
30286.310560 ( 0.000099)| [<ffffffff81008fc6>] ? sched_clock+0x17/0x1b
30286.319949 ( 0.009389)| [<ffffffff81060049>] rebalance_domains+0xe6/0x156
30286.330017 ( 0.010068)| [<ffffffff810603e3>] run_rebalance_domains+0x47/0x164
30286.330184 ( 0.000167)| [<ffffffff8103cf84>] __do_softirq+0x9a/0x147
30286.330282 ( 0.000098)| [<ffffffff81473a4c>] call_softirq+0x1c/0x30
30286.339961 ( 0.009679)| [<ffffffff81004489>] do_softirq+0x61/0xbf
30286.340132 ( 0.000171)| [<ffffffff8103ccd4>] irq_exit+0x43/0xb0
30286.349978 ( 0.009846)| [<ffffffff8101da3a>] smp_apic_timer_interrupt+0x86/0x94
30286.350177 ( 0.000199)| [<ffffffff814730fa>] apic_timer_interrupt+0x6a/0x70
30286.360010 ( 0.009833)| <EOI>
30286.360093 ( 0.000083)| [<ffffffff8105c604>] ? sched_clock_cpu+0xd3/0xde
Disassembly of section .text:
00000000000026f1 <load_balance>:
load_balance():
/data/lwork/gulag1b/holt/nate-test/uv/linux-2.6/linux/kernel/sched/fair.c:4216
26f1: 55 push %rbp
...
load_balance():
/data/lwork/gulag1b/holt/nate-test/uv/linux-2.6/linux/kernel/sched/fair.c:4229
277b: 89 8d 68 ff ff ff mov %ecx,-0x98(%rbp)
bitmap_copy():
/data/lwork/gulag1b/holt/nate-test/uv/linux-2.6/linux/include/linux/bitmap.h:186
2781: 48 63 0d 00 00 00 00 movslq 0x0(%rip),%rcx # 2788 <load_balance+0x97>
load_balance():
/data/lwork/gulag1b/holt/nate-test/uv/linux-2.6/linux/kernel/sched/fair.c:4229
2788: 89 85 58 ff ff ff mov %eax,-0xa8(%rbp)
278e: 48 89 95 60 ff ff ff mov %rdx,-0xa0(%rbp)
bitmap_copy():
/data/lwork/gulag1b/holt/nate-test/uv/linux-2.6/linux/include/linux/bitmap.h:186
2795: 48 83 c1 3f add $0x3f,%rcx
2799: 48 c1 f9 03 sar $0x3,%rcx
279d: 48 83 e1 f8 and $0xfffffffffffffff8,%rcx
27a1: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi)
update_sg_lb_stats():
/data/lwork/gulag1b/holt/nate-test/uv/linux-2.6/linux/kernel/sched/fair.c:3642
27a3: 48 c7 c7 00 00 00 00 mov $0x0,%rdi
load_balance():
/data/lwork/gulag1b/holt/nate-test/uv/linux-2.6/linux/kernel/sched/fair.c:4233
27aa: 8b 85 4c fe ff ff mov -0x1b4(%rbp),%eax
27b0: 41 ff 44 87 70 incl 0x70(%r15,%rax,4)
update_sg_lb_stats():
/data/lwork/gulag1b/holt/nate-test/uv/linux-2.6/linux/kernel/sched/fair.c:3642
27b5: 48 89 bd d8 fd ff ff mov %rdi,-0x228(%rbp)
target_load():
fair.c:
4213 static int load_balance(int this_cpu, struct rq *this_rq,
4214 struct sched_domain *sd, enum cpu_idle_type idle,
4215 int *balance)
4216 {
4217 int ld_moved, active_balance = 0;
4218 struct sched_group *group;
4219 struct rq *busiest;
4220 unsigned long flags;
4221 struct cpumask *cpus = __get_cpu_var(load_balance_tmpmask);
4222
4223 struct lb_env env = {
4224 .sd = sd,
4225 .dst_cpu = this_cpu,
4226 .dst_rq = this_rq,
4227 .idle = idle,
4228 .loop_break = sched_nr_migrate_break,
4229 };
4230
4231 cpumask_copy(cpus, cpu_active_mask);
4232
4233 schedstat_inc(sd, lb_count[idle]);
I am just rushing out for the day and wanted to report this problem
before going.
My quick glance at it did not make any sense so I really have nothing
more to contribute at the time.
Thanks,
Robin
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