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From: "Cédric Le Goater" <clg@kaod.org>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
	linuxppc-dev@lists.ozlabs.org, qemu-ppc@nongnu.org
Cc: tglx@linutronix.de, Paul Mackerras <paulus@samba.org>,
	Nicholas Piggin <npiggin@gmail.com>,
	David Gibson <david@gibson.dropbear.id.au>
Subject: Re: [Qemu-ppc] pseries on qemu-system-ppc64le crashes in doorbell_core_ipi()
Date: Wed, 27 Mar 2019 17:51:50 +0100	[thread overview]
Message-ID: <2bbc1490-400d-585e-d74b-924c570b4236@kaod.org> (raw)
In-Reply-To: <7d97f3c6-4614-ead7-179a-e7e223ea3997@kaod.org>

On 3/27/19 5:37 PM, Cédric Le Goater wrote:
> On 3/27/19 1:36 PM, Sebastian Andrzej Siewior wrote:
>> With qemu-system-ppc64le -machine pseries -smp 4 I get:
>>
>> |#  chrt 1 hackbench
>> |Running in process mode with 10 groups using 40 file descriptors each (== 400 tasks)
>> |Each sender will pass 100 messages of 100 bytes
>> | Oops: Exception in kernel mode, sig: 4 [#1]
>> | LE PAGE_SIZE=64K MMU=Hash PREEMPT SMP NR_CPUS=2048 NUMA pSeries
>> | Modules linked in:
>> | CPU: 0 PID: 629 Comm: hackbench Not tainted 5.1.0-rc2 #71
>> | NIP:  c000000000046978 LR: c000000000046a38 CTR: c0000000000b0150
>> | REGS: c0000001fffeb8e0 TRAP: 0700   Not tainted  (5.1.0-rc2)
>> | MSR:  8000000000089033 <SF,EE,ME,IR,DR,RI,LE>  CR: 42000874  XER: 00000000
>> | CFAR: c000000000046a34 IRQMASK: 1
>> | GPR00: c0000000000b0170 c0000001fffebb70 c000000000a6ba00 0000000028000000
>> …
>> | NIP [c000000000046978] doorbell_core_ipi+0x28/0x30
>> | LR [c000000000046a38] doorbell_try_core_ipi+0xb8/0xf0
>> | Call Trace:
>> | [c0000001fffebb70] [c0000001fffebba0] 0xc0000001fffebba0 (unreliable)
>> | [c0000001fffebba0] [c0000000000b0170] smp_pseries_cause_ipi+0x20/0x70
>> | [c0000001fffebbd0] [c00000000004b02c] arch_send_call_function_single_ipi+0x8c/0xa0
>> | [c0000001fffebbf0] [c0000000001de600] irq_work_queue_on+0xe0/0x130
>> | [c0000001fffebc30] [c0000000001340c8] rto_push_irq_work_func+0xc8/0x120
>> …
>> | Instruction dump:
>> | 60000000 60000000 3c4c00a2 384250b0 3d220009 392949c8 81290000 3929ffff
>> | 7d231838 7c0004ac 5463017e 64632800 <7c00191c> 4e800020 3c4c00a2 38425080
>> | ---[ end trace eb842b544538cbdf ]---
>>
>> and I was wondering whether this is a qemu bug or the kernel is using an
>> opcode it should rather not. If I skip doorbell_try_core_ipi() in
>> smp_pseries_cause_ipi() then there is no crash. The comment says "POWER9
>> should not use this handler" so…
> 
> I would say Linux is using a msgsndp instruction which is not implemented
> in QEMU TCG. But why have we started using dbells in Linux ? 

ah. It seems arch_local_irq_restore() / replay_interrupt() generated
some interrupt.

C.

  reply	other threads:[~2019-03-27 17:02 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-27 12:36 pseries on qemu-system-ppc64le crashes in doorbell_core_ipi() Sebastian Andrzej Siewior
2019-03-27 16:37 ` [Qemu-ppc] " Cédric Le Goater
2019-03-27 16:51   ` Cédric Le Goater [this message]
2019-03-29  5:20     ` Suraj Jitindar Singh
2019-03-29  8:32       ` Sebastian Andrzej Siewior
2019-03-29  9:13       ` Nicholas Piggin
2019-03-29 15:31         ` Steven Rostedt
2019-03-30  3:10           ` Nicholas Piggin
2019-04-01  8:38             ` Peter Zijlstra
2019-04-04 16:25               ` Nicholas Piggin
2019-04-05 14:47                 ` Sebastian Andrzej Siewior
2019-04-06  0:06               ` Frederic Weisbecker
2019-04-09  9:25                 ` Nicholas Piggin
2019-12-19 10:41                   ` Jason A. Donenfeld
2019-12-19 11:13                     ` Sebastian Andrzej Siewior
2019-12-19 11:19                       ` Jason A. Donenfeld
2019-12-19 12:45                     ` Michael Ellerman
2019-12-19 13:08                       ` Cédric Le Goater
2019-12-20  0:22                         ` David? Gibson
2019-12-20 11:32                         ` Jason A. Donenfeld
2019-12-20 12:21                           ` David? Gibson
2019-12-20 15:59                           ` Cédric Le Goater
2019-12-20  0:53                       ` Jason A. Donenfeld

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