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Date: Mon, 12 Sep 2016 15:01:25 +0200
From: Oleg Nesterov <oleg@redhat.com>
To: Nikolay Borisov <kernel@kyup.com>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
        linux-kernel@vger.kernel.org
Subject: Re: BUG_ON in rcu_sync_func triggered
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Hi Nikolay,

On 09/12, Nikolay Borisov wrote:
>
> [ 2213.610208] ------------[ cut here ]------------
> [ 2213.614243] kernel BUG at kernel/rcu/sync.c:152!
> [ 2213.618270] invalid opcode: 0000 [#1] SMP 
> [ 2213.696629] CPU: 5 PID: 0 Comm: swapper/5 Not tainted 4.4.2-clouder2 #1
> [ 2213.702891] Hardware name: Supermicro X9DRW/X9DRW, BIOS 1.0b 10/11/2012
> [ 2213.709155] task: ffff880276a24e00 ti: ffff880276a40000 task.ti: ffff880276a40000
> [ 2213.716391] RIP: 0010:[<ffffffff810a4af0>]  [<ffffffff810a4af0>] rcu_sync_func+0xa0/0xb0
> [ 2213.724407] RSP: 0018:ffff88047fc83da8  EFLAGS: 00010297
> [ 2213.729211] RAX: ffffffff810a4a50 RBX: ffff88025c6b22a0 RCX: 0000000180200018
> [ 2213.736056] RDX: 0000000180200019 RSI: ffffea0011ca1000 RDI: ffff88025c6b22a0
> [ 2213.742903] RBP: ffff88047fc83dd8 R08: ffffea0011ca1010 R09: 0000000000000000
> [ 2213.749750] R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000009
> [ 2213.756597] R13: ffff88025c6b2278 R14: 0000000000000000 R15: ffff880276a40008
> [ 2213.763445] FS:  0000000000000000(0000) GS:ffff88047fc80000(0000) knlGS:0000000000000000
> [ 2213.777149] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 2213.782533] CR2: 0000000003a04028 CR3: 0000000001c0a000 CR4: 00000000000406e0
> [ 2213.789379] Stack:
> [ 2213.790491]  0000000000000008 000000000000000a ffff88047fc83dd8 ffff8804749ec600
> [ 2213.797971]  0000000000000009 000000000000000a ffff88047fc83ec8 ffffffff810a9878
> [ 2213.805457]  ffff88047fc83de0 ffff88047fc8d178 ffff88047fc95580 0000000000000000
> [ 2213.812931] Call Trace:
> [ 2213.814519]  <IRQ> 
> [ 2213.815299]  [<ffffffff810a9878>] rcu_process_callbacks+0x2a8/0x720
> [ 2213.821704]  [<ffffffff8108be0d>] ? run_rebalance_domains+0x18d/0x290
> [ 2213.827776]  [<ffffffff81058ee0>] __do_softirq+0x120/0x320
> [ 2213.832780]  [<ffffffff810ae803>] ? hrtimer_interrupt+0x113/0x1e0
> [ 2213.838464]  [<ffffffff810591b5>] irq_exit+0x75/0x80
> [ 2213.842885]  [<ffffffff816394ba>] smp_apic_timer_interrupt+0x4a/0x60
> [ 2213.848857]  [<ffffffff81637c29>] apic_timer_interrupt+0x89/0x90
> [ 2213.854437]  <EOI> 
> [ 2213.855217]  [<ffffffff8152d912>] ? cpuidle_enter_state+0x152/0x2c0
> [ 2213.861620]  [<ffffffff8152d907>] ? cpuidle_enter_state+0x147/0x2c0
> [ 2213.867495]  [<ffffffff8107cb0d>] ? ttwu_do_wakeup+0x1d/0xe0
> [ 2213.872689]  [<ffffffff8152da97>] cpuidle_enter+0x17/0x20
> [ 2213.877594]  [<ffffffff81094188>] cpu_startup_entry+0x248/0x390
> [ 2213.883081]  [<ffffffff810ba802>] ? clockevents_register_device+0x102/0x160
> [ 2213.889736]  [<ffffffff810ba550>] ? clockevents_config+0x70/0xa0
> [ 2213.895320]  [<ffffffff810ba88c>] ? clockevents_config_and_register+0x2c/0x40
> [ 2213.902169]  [<ffffffff81034ec9>] start_secondary+0xf9/0x100
> [ 2213.933638] RIP  [<ffffffff810a4af0>] rcu_sync_func+0xa0/0xb0
> [ 2213.939118]  RSP <ffff88047fc83da8>
> 
> 
> The bug on in question is this: BUG_ON(rsp->gp_state != GP_PASSED);
> 
> Have you seen something like that before - the kernel is fairly old 4.4.2,

No... thanks, I'll try to look tomorrow.

Oleg.