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Date:   Sun, 19 May 2019 23:46:17 -0400 (EDT)
From:   Pankaj Gupta <pagupta@...hat.com>
To:     Jakub StaroĊ„ <jstaron@...gle.com>
Cc:     cohuck@...hat.com, jack@...e.cz, kvm@...r.kernel.org,
        mst@...hat.com, jasowang@...hat.com, david@...morbit.com,
        qemu-devel@...gnu.org, virtualization@...ts.linux-foundation.org,
        adilger kernel <adilger.kernel@...ger.ca>, smbarber@...gle.com,
        zwisler@...nel.org, aarcange@...hat.com,
        dave jiang <dave.jiang@...el.com>, linux-nvdimm@...ts.01.org,
        vishal l verma <vishal.l.verma@...el.com>, david@...hat.com,
        willy@...radead.org, hch@...radead.org, linux-acpi@...r.kernel.org,
        jmoyer@...hat.com, linux-ext4@...r.kernel.org, lenb@...nel.org,
        kilobyte@...band.pl, riel@...riel.com,
        yuval shaia <yuval.shaia@...cle.com>, stefanha@...hat.com,
        imammedo@...hat.com, dan j williams <dan.j.williams@...el.com>,
        lcapitulino@...hat.com, kwolf@...hat.com, nilal@...hat.com,
        tytso@....edu, xiaoguangrong eric <xiaoguangrong.eric@...il.com>,
        darrick wong <darrick.wong@...cle.com>, rjw@...ysocki.net,
        linux-kernel@...r.kernel.org, linux-xfs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, pbonzini@...hat.com
Subject: Re: [Qemu-devel] [PATCH v9 2/7] virtio-pmem: Add virtio pmem driver


> On 5/16/19 10:35 PM, Pankaj Gupta wrote:
> > Can I take it your reviewed/acked-by? or tested-by tag? for the virtio
> > patch :)I don't feel that I have enough expertise to give the reviewed-by
> > tag, but you can
> take my acked-by + tested-by.
> 
> Acked-by: Jakub Staron <jstaron@...gle.com>
> Tested-by: Jakub Staron <jstaron@...gle.com>
> 
> No kernel panics/stalls encountered during testing this patches (v9) with
> QEMU + xfstests.

Thank you for testing and confirming the results. I will add your tested &
acked-by in v10.

> Some CPU stalls encountered while testing with crosvm instead of QEMU with
> xfstests
> (test generic/464) but no repro for QEMU, so the fault may be on the side of
> crosvm.

yes, looks like crosvm related as we did not see any of this in my and your
testing with Qemu. 

> 
> 
> The dump for the crosvm/xfstests stall:
> [ 2504.175276] rcu: INFO: rcu_sched detected stalls on CPUs/tasks:
> [ 2504.176681] rcu:     0-...!: (1 GPs behind) idle=9b2/1/0x4000000000000000
> softirq=1089198/1089202 fqs=0
> [ 2504.178270] rcu:     2-...!: (1 ticks this GP)
> idle=cfe/1/0x4000000000000002 softirq=1055108/1055110 fqs=0
> [ 2504.179802] rcu:     3-...!: (1 GPs behind) idle=1d6/1/0x4000000000000002
> softirq=1046798/1046802 fqs=0
> [ 2504.181215] rcu:     4-...!: (2 ticks this GP)
> idle=522/1/0x4000000000000002 softirq=1249063/1249064 fqs=0
> [ 2504.182625] rcu:     5-...!: (1 GPs behind) idle=6da/1/0x4000000000000000
> softirq=1131036/1131047 fqs=0
> [ 2504.183955]  (detected by 3, t=0 jiffies, g=1232529, q=1370)
> [ 2504.184762] Sending NMI from CPU 3 to CPUs 0:
> [ 2504.186400] NMI backtrace for cpu 0
> [ 2504.186401] CPU: 0 PID: 6670 Comm: 464 Not tainted 5.1.0+ #1
> [ 2504.186401] Hardware name: ChromiumOS crosvm, BIOS 0
> [ 2504.186402] RIP: 0010:queued_spin_lock_slowpath+0x1c/0x1e0
> [ 2504.186402] Code: e7 89 c8 f0 44 0f b1 07 39 c1 75 dc f3 c3 0f 1f 44 00 00
> ba 01 00 00 00 8b 07 85 c0 75 0a f0 0f b1 17 85 c0 75 f2 f3 c3 f3 90 <eb> ec
> 81 fe 00 01 00 00 0f 84 ab 00 00 00 81 e6 00 ff ff ff 75 44
> [ 2504.186403] RSP: 0018:ffffc90000003ee8 EFLAGS: 00000002
> [ 2504.186404] RAX: 0000000000000001 RBX: 0000000000000246 RCX:
> 0000000000404044
> [ 2504.186404] RDX: 0000000000000001 RSI: 0000000000000001 RDI:
> ffffffff8244a280
> [ 2504.186405] RBP: ffffffff8244a280 R08: 00000000000f4200 R09:
> 0000024709ed6c32
> [ 2504.186405] R10: 0000000000000000 R11: 0000000000000001 R12:
> ffffffff8244a280
> [ 2504.186405] R13: 0000000000000009 R14: 0000000000000009 R15:
> 0000000000000000
> [ 2504.186406] FS:  0000000000000000(0000) GS:ffff8880cc600000(0000)
> knlGS:0000000000000000
> [ 2504.186406] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 2504.186406] CR2: 00007efd6b0f15d8 CR3: 000000000260a006 CR4:
> 0000000000360ef0
> [ 2504.186407] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
> 0000000000000000
> [ 2504.186407] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
> 0000000000000400
> [ 2504.186407] Call Trace:
> [ 2504.186408]  <IRQ>
> [ 2504.186408]  _raw_spin_lock_irqsave+0x1d/0x30
> [ 2504.186408]  rcu_core+0x3b6/0x740
> [ 2504.186408]  ? __hrtimer_run_queues+0x133/0x280
> [ 2504.186409]  ? recalibrate_cpu_khz+0x10/0x10
> [ 2504.186409]  __do_softirq+0xd8/0x2e4
> [ 2504.186409]  irq_exit+0xa3/0xb0
> [ 2504.186410]  smp_apic_timer_interrupt+0x67/0x120
> [ 2504.186410]  apic_timer_interrupt+0xf/0x20
> [ 2504.186410]  </IRQ>
> [ 2504.186410] RIP: 0010:unmap_page_range+0x47a/0x9b0
> [ 2504.186411] Code: 0f 46 46 10 49 39 6e 18 49 89 46 10 48 89 e8 49 0f 43 46
> 18 41 80 4e 20 08 4d 85 c9 49 89 46 18 0f 84 68 ff ff ff 49 8b 51 08 <48> 8d
> 42 ff 83 e2 01 49 0f 44 c1 f6 40 18 01 75 38 48 ba ff 0f 00
> [ 2504.186411] RSP: 0018:ffffc900036cbcc8 EFLAGS: 00000282 ORIG_RAX:
> ffffffffffffff13
> [ 2504.186412] RAX: ffffffffffffffff RBX: 800000003751d045 RCX:
> 0000000000000001
> [ 2504.186413] RDX: ffffea0002e09288 RSI: 000000000269b000 RDI:
> ffff8880b6525e40
> [ 2504.186413] RBP: 000000000269c000 R08: 0000000000000000 R09:
> ffffea0000dd4740
> [ 2504.186413] R10: ffffea0001755700 R11: ffff8880cc62d120 R12:
> 0000000002794000
> [ 2504.186414] R13: 000000000269b000 R14: ffffc900036cbdf0 R15:
> ffff8880572434d8
> [ 2504.186414]  ? unmap_page_range+0x420/0x9b0
> [ 2504.186414]  ? release_pages+0x175/0x390
> [ 2504.186414]  unmap_vmas+0x7c/0xe0
> [ 2504.186415]  exit_mmap+0xa4/0x190
> [ 2504.186415]  mmput+0x3b/0x100
> [ 2504.186415]  do_exit+0x276/0xc10
> [ 2504.186415]  do_group_exit+0x35/0xa0
> [ 2504.186415]  __x64_sys_exit_group+0xf/0x10
> [ 2504.186416]  do_syscall_64+0x43/0x120
> [ 2504.186416]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
> [ 2504.186416] RIP: 0033:0x7efd6ae10618
> [ 2504.186416] Code: Bad RIP value.
> [ 2504.186417] RSP: 002b:00007ffcac9bde38 EFLAGS: 00000246 ORIG_RAX:
> 00000000000000e7
> [ 2504.186417] RAX: ffffffffffffffda RBX: 0000000000000000 RCX:
> 00007efd6ae10618
> [ 2504.186418] RDX: 0000000000000000 RSI: 000000000000003c RDI:
> 0000000000000000
> [ 2504.186418] RBP: 00007efd6b0ed8e0 R08: 00000000000000e7 R09:
> ffffffffffffff98
> [ 2504.186418] R10: 00007ffcac9bddb8 R11: 0000000000000246 R12:
> 00007efd6b0ed8e0
> [ 2504.186419] R13: 00007efd6b0f2c20 R14: 0000000000000060 R15:
> 000000000070e705
> [ 2504.186421] NMI backtrace for cpu 3
> [ 2504.226980] CPU: 3 PID: 6596 Comm: xfs_io Not tainted 5.1.0+ #1
> [ 2504.227661] Hardware name: ChromiumOS crosvm, BIOS 0
> [ 2504.228261] Call Trace:
> [ 2504.228552]  <IRQ>
> [ 2504.228795]  dump_stack+0x46/0x5b
> [ 2504.229180]  nmi_cpu_backtrace+0x89/0x90
> [ 2504.229649]  ? lapic_can_unplug_cpu+0x90/0x90
> [ 2504.230157]  nmi_trigger_cpumask_backtrace+0x82/0xc0
> [ 2504.230751]  rcu_dump_cpu_stacks+0x8b/0xb7
> [ 2504.231222]  rcu_sched_clock_irq+0x6f6/0x720
> [ 2504.231726]  ? tick_sched_do_timer+0x50/0x50
> [ 2504.232214]  update_process_times+0x23/0x50
> [ 2504.232693]  tick_sched_handle+0x2f/0x40
> [ 2504.233144]  tick_sched_timer+0x32/0x70
> [ 2504.233594]  __hrtimer_run_queues+0x103/0x280
> [ 2504.234092]  hrtimer_interrupt+0xe0/0x240
> [ 2504.234580]  smp_apic_timer_interrupt+0x5d/0x120
> [ 2504.235152]  apic_timer_interrupt+0xf/0x20
> [ 2504.235627]  </IRQ>
> [ 2504.235879] RIP: 0010:__memcpy_flushcache+0x4b/0x180
> [ 2504.236452] Code: 8d 5d e0 4c 8d 62 20 48 89 f7 48 29 d7 48 89 d9 48 83 e1
> e0 4c 01 e1 48 8d 04 17 4c 8b 02 4c 8b 4a 08 4c 8b 52 10 4c 8b 5a 18 <4c> 0f
> c3 00 4c 0f c3 48 08 4c 0f c3 50 10 4c 0f c3 58 18 48 83 c2
> [ 2504.238592] RSP: 0018:ffffc90003ae38e8 EFLAGS: 00010286 ORIG_RAX:
> ffffffffffffff13
> [ 2504.239467] RAX: ffff888341800000 RBX: 0000000000000fe0 RCX:
> ffff88801bd22000
> [ 2504.240277] RDX: ffff88801bd21000 RSI: ffff888341800000 RDI:
> 0000000325adf000
> [ 2504.241092] RBP: 0000000000001000 R08: cdcdcdcdcdcdcdcd R09:
> cdcdcdcdcdcdcdcd
> [ 2504.241908] R10: cdcdcdcdcdcdcdcd R11: cdcdcdcdcdcdcdcd R12:
> ffff88801bd21020
> [ 2504.242751] R13: ffff8880b916b600 R14: ffff888341800000 R15:
> ffffea00006f4840
> [ 2504.243602]  write_pmem+0x61/0x90
> [ 2504.244002]  pmem_do_bvec+0x178/0x2c0
> [ 2504.244469]  ? chksum_update+0xe/0x20
> [ 2504.244908]  pmem_make_request+0xf7/0x270
> [ 2504.245509]  generic_make_request+0x199/0x3f0
> [ 2504.246179]  ? submit_bio+0x67/0x130
> [ 2504.246710]  submit_bio+0x67/0x130
> [ 2504.247117]  ext4_io_submit+0x44/0x50
> [ 2504.247556]  ext4_writepages+0x621/0xe80
> [ 2504.248028]  ? 0xffffffff81000000
> [ 2504.248418]  ? do_writepages+0x46/0xd0
> [ 2504.248880]  ? ext4_mark_inode_dirty+0x1d0/0x1d0
> [ 2504.249417]  do_writepages+0x46/0xd0
> [ 2504.249833]  ? release_pages+0x175/0x390
> [ 2504.250290]  ? __filemap_fdatawrite_range+0x7c/0xb0
> [ 2504.250879]  __filemap_fdatawrite_range+0x7c/0xb0
> [ 2504.251427]  ext4_release_file+0x67/0xa0
> [ 2504.251897]  __fput+0xb1/0x220
> [ 2504.252260]  task_work_run+0x79/0xa0
> [ 2504.252676]  do_exit+0x2ca/0xc10
> [ 2504.253063]  ? __switch_to_asm+0x40/0x70
> [ 2504.253530]  ? __switch_to_asm+0x34/0x70
> [ 2504.253995]  ? __switch_to_asm+0x40/0x70
> [ 2504.254446]  do_group_exit+0x35/0xa0
> [ 2504.254865]  get_signal+0x14e/0x7a0
> [ 2504.255281]  ? __switch_to_asm+0x34/0x70
> [ 2504.255749]  ? __switch_to_asm+0x40/0x70
> [ 2504.256224]  do_signal+0x2b/0x5e0
> [ 2504.256619]  ? __switch_to_asm+0x40/0x70
> [ 2504.257086]  ? __switch_to_asm+0x34/0x70
> [ 2504.257552]  ? __switch_to_asm+0x40/0x70
> [ 2504.258022]  ? __switch_to_asm+0x34/0x70
> [ 2504.258488]  ? __schedule+0x253/0x530
> [ 2504.258943]  ? __switch_to_asm+0x34/0x70
> [ 2504.259398]  exit_to_usermode_loop+0x87/0xa0
> [ 2504.259900]  do_syscall_64+0xf7/0x120
> [ 2504.260326]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
> [ 2504.260923] RIP: 0033:0x7faf347e28bd
> [ 2504.261348] Code: Bad RIP value.
> [ 2504.261727] RSP: 002b:00007faf33fc5f40 EFLAGS: 00000293 ORIG_RAX:
> 0000000000000022
> [ 2504.262594] RAX: fffffffffffffdfe RBX: 0000000000000000 RCX:
> 00007faf347e28bd
> [ 2504.263416] RDX: 8b9da1f4246cdb38 RSI: 0000000000000000 RDI:
> 0000000000000000
> [ 2504.264215] RBP: 0000000000000000 R08: 00007faf33fc6700 R09:
> 00007faf33fc6700
> [ 2504.265061] R10: 000000000000012d R11: 0000000000000293 R12:
> 00007ffdf142327e
> [ 2504.266082] R13: 00007ffdf142327f R14: 00007faf337c6000 R15:
> 0000000000000003
> 
> Arch: x86_64
> Kernel: stable top with virtio-pmem v9 patches applied
> Distro: Debian Stretch
> 
> But as I said, it may be just a problem with crosvm.
Right.

Thanks,
Pankaj
> 
> 
> Thank you,
> Jakub Staron
> 
> 

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