On Mon, Feb 4, 2019 at 1:47 PM Nitesh Narayan Lal <nit...@redhat.com> wrote:
>
> The following patch-set proposes an efficient mechanism for handing freed
> memory between the guest and the host. It enables the guests with no page
> cache to rapidly free and reclaims memory to and from the host respectively.
>
> Benefit:
> With this patch-series, in our test-case, executed on a single system and
> single NUMA node with 15GB memory, we were able to successfully launch
> atleast 5 guests
> when page hinting was enabled and 3 without it. (Detailed explanation of the
> test procedure is provided at the bottom).
>
> Changelog in V8:
> In this patch-series, the earlier approach [1] which was used to capture and
> scan the pages freed by the guest has been changed. The new approach is
> briefly described below:
>
> The patch-set still leverages the existing arch_free_page() to add this
> functionality. It maintains a per CPU array which is used to store the pages
> freed by the guest. The maximum number of entries which it can hold is
> defined by MAX_FGPT_ENTRIES(1000). When the array is completely filled, it is
> scanned and only the pages which are available in the buddy are stored. This
> process continues until the array is filled with pages which are part of the
> buddy free list. After which it wakes up a kernel per-cpu-thread.
> This kernel per-cpu-thread rescans the per-cpu-array for any re-allocation
> and if the page is not reallocated and present in the buddy, the kernel
> thread attempts to isolate it from the buddy. If it is successfully isolated,
> the page is added to another per-cpu array. Once the entire scanning process
> is complete, all the isolated pages are reported to the host through an
> existing virtio-balloon driver.
>
> Known Issues:
> * Fixed array size: The problem with having a fixed/hardcoded array
> size arises when the size of the guest varies. For example when the guest
> size increases and it starts making large allocations fixed size limits this
> solution's ability to capture all the freed pages. This will result in less
> guest free memory getting reported to the host.
>
> Known code re-work:
> * Plan to re-use Wei's work, which communicates the poison value to
> the host.
> * The nomenclatures used in virtio-balloon needs to be changed so
> that the code can easily be distinguished from Wei's Free Page Hint code.
> * Sorting based on zonenum, to avoid repetitive zone locks for the
> same zone.
>
> Other required work:
> * Run other benchmarks to evaluate the performance/impact of this
> approach.
>
> Test case:
> Setup:
> Memory-15837 MB
> Guest Memory Size-5 GB
> Swap-Disabled
> Test Program-Simple program which allocates 4GB memory via malloc, touches it
> via memset and exits.
> Use case-Number of guests that can be launched completely including the
> successful execution of the test program.
> Procedure:
> The first guest is launched and once its console is up, the test allocation
> program is executed with 4 GB memory request (Due to this the guest occupies
> almost 4-5 GB of memory in the host in a system without page hinting). Once
> this program exits at that time another guest is launched in the host and the
> same process is followed. We continue launching the guests until a guest gets
> killed due to low memory condition in the host.
>
> Result:
> Without Hinting-3 Guests
> With Hinting-5 to 7 Guests(Based on the amount of memory freed/captured).
>
> [1] https://www.spinics.net/lists/kvm/msg170113.html
So I tried reproducing your test and I am not having much luck.
According to the sysctl in the guest I am seeing
"vm.guest-page-hinting = 1" which is supposed to indicate that the
hinting is enabled in both QEMU and the guest right? I'm just wanting
to verify that this is the case before I start doing any debugging.
I'm assuming you never really ran any multi-threaded tests on a
multi-CPU guest did you? With the patches applied I am seeing
stability issues. If I enable a VM with multiple CPUs and run
something like the page_fault1 test from the will-it-scale suite I am
seeing multiple traces being generated by the guest kernel and it
ultimately just hangs.
I have included the traces below. There end up being 3 specific
issues, a double free that is detected, the RCU stall, and then starts
complaining about a soft lockup.
Thanks.
- Alex
-- This looks like a page complaining about a double add when added to
the LRU --
[ 50.479635] list_add double add: new=fffff64480000008,
prev=ffffa000fffd50c0, next=fffff64480000008.
[ 50.481066] ------------[ cut here ]------------
[ 50.481753] kernel BUG at lib/list_debug.c:31!
[ 50.482448] invalid opcode: 0000 [#1] SMP PTI
[ 50.483108] CPU: 1 PID: 852 Comm: hinting/1 Not tainted
5.0.0-rc7-next-20190219-baseline+ #50
[ 50.486362] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS Bochs 01/01/2011
[ 50.487881] RIP: 0010:__list_add_valid+0x4b/0x70
[ 50.488623] Code: 00 00 c3 48 89 c1 48 c7 c7 d8 70 10 9e 31 c0 e8
4f db c8 ff 0f 0b 48 89 c1 48 89 fe 31 c0 48 c7 c7 88 71 10 9e e8 39
db c8 ff <0f> 0b 48 89 d1 48 c7 c7 30 71 10 9e 48 89 f2 48 89 c6 31 c0
e8 20
[ 50.492626] RSP: 0018:ffffb9a8c3b4bdf0 EFLAGS: 00010246
[ 50.494189] RAX: 0000000000000058 RBX: ffffa000fffd50c0 RCX: 0000000000000000
[ 50.496308] RDX: 0000000000000000 RSI: ffffa000df85e6c8 RDI: ffffa000df85e6c8
[ 50.497876] RBP: ffffa000fffd50c0 R08: 0000000000000273 R09: 0000000000000005
[ 50.498981] R10: 0000000000000000 R11: ffffb9a8c3b4bb70 R12: fffff64480000008
[ 50.500077] R13: fffff64480000008 R14: fffff64480000000 R15: ffffa000fffd5000
[ 50.501184] FS: 0000000000000000(0000) GS:ffffa000df840000(0000)
knlGS:0000000000000000
[ 50.502432] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 50.503325] CR2: 00007ffff6e47000 CR3: 000000080f76c002 CR4: 0000000000160ee0
[ 50.504431] Call Trace:
[ 50.505464] free_one_page+0x2b5/0x470
[ 50.506070] hyperlist_ready+0xa9/0xc0
[ 50.506662] hinting_fn+0x1db/0x3c0
[ 50.507220] smpboot_thread_fn+0x10e/0x160
[ 50.507868] kthread+0xf8/0x130
[ 50.508371] ? sort_range+0x20/0x20
[ 50.508934] ? kthread_bind+0x10/0x10
[ 50.509520] ret_from_fork+0x35/0x40
[ 50.510098] Modules linked in: ip6t_rpfilter ip6t_REJECT
nf_reject_ipv6 xt_conntrack ip_set nfnetlink ebtable_nat
ebtable_broute bridge stp llc ip6table_nat nf_nat_ipv6 ip6table_mangle
ip6table_raw ip6table_security iptable_nat nf_nat_ipv4 nf_nat
nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 iptable_mangle iptable_raw
iptable_security ebtable_filter ebtables ip6table_filter ip6_tables
sunrpc sb_edac crct10dif_pclmul crc32_pclmul ghash_clmulni_intel
kvm_intel kvm ppdev irqbypass parport_pc joydev virtio_balloon
pcc_cpufreq i2c_piix4 pcspkr parport xfs libcrc32c cirrus
drm_kms_helper ttm drm e1000 crc32c_intel virtio_blk ata_generic
floppy serio_raw pata_acpi qemu_fw_cfg
[ 50.519202] ---[ end trace 141fe2acdf2e3818 ]---
[ 50.519935] RIP: 0010:__list_add_valid+0x4b/0x70
[ 50.520675] Code: 00 00 c3 48 89 c1 48 c7 c7 d8 70 10 9e 31 c0 e8
4f db c8 ff 0f 0b 48 89 c1 48 89 fe 31 c0 48 c7 c7 88 71 10 9e e8 39
db c8 ff <0f> 0b 48 89 d1 48 c7 c7 30 71 10 9e 48 89 f2 48 89 c6 31 c0
e8 20
[ 50.523570] RSP: 0018:ffffb9a8c3b4bdf0 EFLAGS: 00010246
[ 50.524399] RAX: 0000000000000058 RBX: ffffa000fffd50c0 RCX: 0000000000000000
[ 50.525516] RDX: 0000000000000000 RSI: ffffa000df85e6c8 RDI: ffffa000df85e6c8
[ 50.526634] RBP: ffffa000fffd50c0 R08: 0000000000000273 R09: 0000000000000005
[ 50.527754] R10: 0000000000000000 R11: ffffb9a8c3b4bb70 R12: fffff64480000008
[ 50.528872] R13: fffff64480000008 R14: fffff64480000000 R15: ffffa000fffd5000
[ 50.530004] FS: 0000000000000000(0000) GS:ffffa000df840000(0000)
knlGS:0000000000000000
[ 50.531276] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 50.532189] CR2: 00007ffff6e47000 CR3: 000000080f76c002 CR4: 0000000000160ee0
-- This appears to be a deadlock on the zone lock --
[ 156.436784] rcu: INFO: rcu_sched detected stalls on CPUs/tasks:
[ 156.439195] rcu: 0-...0: (0 ticks this GP)
idle=6ca/1/0x4000000000000000 softirq=10718/10718 fqs=2546
[ 156.440810] rcu: 1-...0: (1 GPs behind)
idle=8f2/1/0x4000000000000000 softirq=8233/8235 fqs=2547
[ 156.442320] rcu: 2-...0: (0 ticks this GP)
idle=ae2/1/0x4000000000000002 softirq=6779/6779 fqs=2547
[ 156.443910] rcu: 3-...0: (0 ticks this GP)
idle=456/1/0x4000000000000000 softirq=1616/1616 fqs=2547
[ 156.445454] rcu: (detected by 14, t=60109 jiffies, g=17493, q=31)
[ 156.446545] Sending NMI from CPU 14 to CPUs 0:
[ 156.448330] NMI backtrace for cpu 0
[ 156.448331] CPU: 0 PID: 1308 Comm: page_fault1_pro Tainted: G
D 5.0.0-rc7-next-20190219-baseline+ #50
[ 156.448331] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS Bochs 01/01/2011
[ 156.448332] RIP: 0010:queued_spin_lock_slowpath+0x21/0x1f0
[ 156.448332] Code: c0 75 ec c3 90 90 90 90 90 0f 1f 44 00 00 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 44 01 00 00 81 e6 00 ff ff ff
75 3e
[ 156.448333] RSP: 0000:ffffb9a8c3e83c10 EFLAGS: 00000002
[ 156.448339] RAX: 0000000000000001 RBX: 0000000000000007 RCX: 0000000000000001
[ 156.448340] RDX: 0000000000000001 RSI: 0000000000000001 RDI: ffffa000fffd6240
[ 156.448340] RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000006f36aa
[ 156.448341] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000081
[ 156.448341] R13: 0000000000100dca R14: 0000000000000000 R15: ffffa000fffd5d00
[ 156.448342] FS: 00007ffff7fec440(0000) GS:ffffa000df800000(0000)
knlGS:0000000000000000
[ 156.448342] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 156.448342] CR2: 00007fffefe2d000 CR3: 0000000695904004 CR4: 0000000000160ef0
[ 156.448343] Call Trace:
[ 156.448343] get_page_from_freelist+0x50f/0x1280
[ 156.448343] ? get_page_from_freelist+0xa44/0x1280
[ 156.448344] __alloc_pages_nodemask+0x141/0x2e0
[ 156.448344] alloc_pages_vma+0x73/0x180
[ 156.448344] __handle_mm_fault+0xd59/0x14e0
[ 156.448345] handle_mm_fault+0xfa/0x210
[ 156.448345] __do_page_fault+0x207/0x4c0
[ 156.448345] do_page_fault+0x32/0x140
[ 156.448346] ? async_page_fault+0x8/0x30
[ 156.448346] async_page_fault+0x1e/0x30
[ 156.448346] RIP: 0033:0x401840
[ 156.448347] Code: 00 00 45 31 c9 31 ff 41 b8 ff ff ff ff b9 22 00
00 00 ba 03 00 00 00 be 00 00 00 08 e8 d9 f5 ff ff 48 83 f8 ff 74 2b
48 89 c2 <c6> 02 00 48 01 ea 48 83 03 01 48 89 d1 48 29 c1 48 81 f9 ff
ff ff
[ 156.448347] RSP: 002b:00007fffffffc0a0 EFLAGS: 00010293
[ 156.448348] RAX: 00007fffeee48000 RBX: 00007ffff7ff7000 RCX: 0000000000fe5000
[ 156.448348] RDX: 00007fffefe2d000 RSI: 0000000008000000 RDI: 0000000000000000
[ 156.448349] RBP: 0000000000001000 R08: ffffffffffffffff R09: 0000000000000000
[ 156.448349] R10: 0000000000000022 R11: 0000000000000246 R12: 00007fffffffc240
[ 156.448349] R13: 0000000000000000 R14: 0000000000610710 R15: 0000000000000005
[ 156.448355] Sending NMI from CPU 14 to CPUs 1:
[ 156.489676] NMI backtrace for cpu 1
[ 156.489677] CPU: 1 PID: 1309 Comm: page_fault1_pro Tainted: G
D 5.0.0-rc7-next-20190219-baseline+ #50
[ 156.489677] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS Bochs 01/01/2011
[ 156.489678] RIP: 0010:queued_spin_lock_slowpath+0x21/0x1f0
[ 156.489678] Code: c0 75 ec c3 90 90 90 90 90 0f 1f 44 00 00 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 44 01 00 00 81 e6 00 ff ff ff
75 3e
[ 156.489679] RSP: 0000:ffffb9a8c3b4bc10 EFLAGS: 00000002
[ 156.489679] RAX: 0000000000000001 RBX: 0000000000000007 RCX: 0000000000000001
[ 156.489680] RDX: 0000000000000001 RSI: 0000000000000001 RDI: ffffa000fffd6240
[ 156.489680] RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000006f36aa
[ 156.489680] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000081
[ 156.489681] R13: 0000000000100dca R14: 0000000000000000 R15: ffffa000fffd5d00
[ 156.489681] FS: 00007ffff7fec440(0000) GS:ffffa000df840000(0000)
knlGS:0000000000000000
[ 156.489682] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 156.489682] CR2: 00007ffff4608000 CR3: 000000081ddf6003 CR4: 0000000000160ee0
[ 156.489682] Call Trace:
[ 156.489683] get_page_from_freelist+0x50f/0x1280
[ 156.489683] ? get_page_from_freelist+0xa44/0x1280
[ 156.489683] __alloc_pages_nodemask+0x141/0x2e0
[ 156.489683] alloc_pages_vma+0x73/0x180
[ 156.489684] __handle_mm_fault+0xd59/0x14e0
[ 156.489684] handle_mm_fault+0xfa/0x210
[ 156.489684] __do_page_fault+0x207/0x4c0
[ 156.489685] do_page_fault+0x32/0x140
[ 156.489685] ? async_page_fault+0x8/0x30
[ 156.489685] async_page_fault+0x1e/0x30
[ 156.489686] RIP: 0033:0x401840
[ 156.489686] Code: 00 00 45 31 c9 31 ff 41 b8 ff ff ff ff b9 22 00
00 00 ba 03 00 00 00 be 00 00 00 08 e8 d9 f5 ff ff 48 83 f8 ff 74 2b
48 89 c2 <c6> 02 00 48 01 ea 48 83 03 01 48 89 d1 48 29 c1 48 81 f9 ff
ff ff
[ 156.489687] RSP: 002b:00007fffffffc0a0 EFLAGS: 00010293
[ 156.489687] RAX: 00007fffeee48000 RBX: 00007ffff7ff7080 RCX: 00000000057c0000
[ 156.489692] RDX: 00007ffff4608000 RSI: 0000000008000000 RDI: 0000000000000000
[ 156.489693] RBP: 0000000000001000 R08: ffffffffffffffff R09: 0000000000000000
[ 156.489693] R10: 0000000000000022 R11: 0000000000000246 R12: 00007fffffffc240
[ 156.489694] R13: 0000000000000000 R14: 000000000060f870 R15: 0000000000000005
[ 156.489696] Sending NMI from CPU 14 to CPUs 2:
[ 156.530601] NMI backtrace for cpu 2
[ 156.530602] CPU: 2 PID: 858 Comm: hinting/2 Tainted: G D
5.0.0-rc7-next-20190219-baseline+ #50
[ 156.530602] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS Bochs 01/01/2011
[ 156.530603] RIP: 0010:queued_spin_lock_slowpath+0x21/0x1f0
[ 156.530603] Code: c0 75 ec c3 90 90 90 90 90 0f 1f 44 00 00 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 44 01 00 00 81 e6 00 ff ff ff
75 3e
[ 156.530604] RSP: 0018:ffffa000df883e38 EFLAGS: 00000002
[ 156.530604] RAX: 0000000000000001 RBX: fffff644a05a0ec8 RCX: dead000000000200
[ 156.530605] RDX: 0000000000000001 RSI: 0000000000000001 RDI: ffffa000fffd6240
[ 156.530605] RBP: ffffa000df8af340 R08: ffffa000da2b2000 R09: 0000000000000100
[ 156.530606] R10: 0000000000000004 R11: 0000000000000005 R12: fffff6449fb5fb08
[ 156.530606] R13: ffffa000fffd5d00 R14: 0000000000000001 R15: 0000000000000001
[ 156.530606] FS: 0000000000000000(0000) GS:ffffa000df880000(0000)
knlGS:0000000000000000
[ 156.530607] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 156.530607] CR2: 00007ffff6e47000 CR3: 0000000813b34003 CR4: 0000000000160ee0
[ 156.530607] Call Trace:
[ 156.530608] <IRQ>
[ 156.530608] free_pcppages_bulk+0x1af/0x6d0
[ 156.530608] free_unref_page+0x54/0x70
[ 156.530608] tlb_remove_table_rcu+0x23/0x40
[ 156.530609] rcu_core+0x2b0/0x470
[ 156.530609] __do_softirq+0xde/0x2bf
[ 156.530609] irq_exit+0xd5/0xe0
[ 156.530610] smp_apic_timer_interrupt+0x74/0x140
[ 156.530610] apic_timer_interrupt+0xf/0x20
[ 156.530610] </IRQ>
[ 156.530611] RIP: 0010:_raw_spin_lock+0x10/0x20
[ 156.530611] Code: b8 01 00 00 00 c3 48 8b 3c 24 be 00 02 00 00 e8
f6 cf 77 ff 31 c0 c3 0f 1f 00 0f 1f 44 00 00 31 c0 ba 01 00 00 00 f0
0f b1 17 <0f> 94 c2 84 d2 74 02 f3 c3 89 c6 e9 d0 e8 7c ff 0f 1f 44 00
00 65
[ 156.530612] RSP: 0018:ffffb9a8c3bf3df0 EFLAGS: 00000246 ORIG_RAX:
ffffffffffffff13
[ 156.530612] RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000
[ 156.530613] RDX: 0000000000000001 RSI: fffff6449fd4aec0 RDI: ffffa000fffd6240
[ 156.530613] RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000002
[ 156.530613] R10: 0000000000000000 R11: 0000000000003bf3 R12: 00000000007f52bb
[ 156.530614] R13: 00000000007ecca4 R14: fffff6449fd4aec0 R15: ffffa000fffd5d00
[ 156.530614] free_one_page+0x32/0x470
[ 156.530614] ? __switch_to_asm+0x40/0x70
[ 156.530615] hyperlist_ready+0xa9/0xc0
[ 156.530615] hinting_fn+0x1db/0x3c0
[ 156.530615] smpboot_thread_fn+0x10e/0x160
[ 156.530616] kthread+0xf8/0x130
[ 156.530616] ? sort_range+0x20/0x20
[ 156.530616] ? kthread_bind+0x10/0x10
[ 156.530616] ret_from_fork+0x35/0x40
[ 156.530619] Sending NMI from CPU 14 to CPUs 3:
[ 156.577112] NMI backtrace for cpu 3
[ 156.577113] CPU: 3 PID: 1311 Comm: page_fault1_pro Tainted: G
D 5.0.0-rc7-next-20190219-baseline+ #50
[ 156.577113] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS Bochs 01/01/2011
[ 156.577114] RIP: 0010:queued_spin_lock_slowpath+0x21/0x1f0
[ 156.577114] Code: c0 75 ec c3 90 90 90 90 90 0f 1f 44 00 00 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 44 01 00 00 81 e6 00 ff ff ff
75 3e
[ 156.577115] RSP: 0000:ffffb9a8c407fc10 EFLAGS: 00000002
[ 156.577115] RAX: 0000000000000001 RBX: 0000000000000007 RCX: 0000000000000001
[ 156.577116] RDX: 0000000000000001 RSI: 0000000000000001 RDI: ffffa000fffd6240
[ 156.577116] RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000006f36aa
[ 156.577121] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000081
[ 156.577122] R13: 0000000000100dca R14: 0000000000000000 R15: ffffa000fffd5d00
[ 156.577122] FS: 00007ffff7fec440(0000) GS:ffffa000df8c0000(0000)
knlGS:0000000000000000
[ 156.577122] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 156.577123] CR2: 00007ffff398a000 CR3: 000000081aa00003 CR4: 0000000000160ee0
[ 156.577123] Call Trace:
[ 156.577123] get_page_from_freelist+0x50f/0x1280
[ 156.577124] ? get_page_from_freelist+0xa44/0x1280
[ 156.577124] ? try_charge+0x637/0x860
[ 156.577124] __alloc_pages_nodemask+0x141/0x2e0
[ 156.577125] alloc_pages_vma+0x73/0x180
[ 156.577125] __handle_mm_fault+0xd59/0x14e0
[ 156.577125] handle_mm_fault+0xfa/0x210
[ 156.577126] __do_page_fault+0x207/0x4c0
[ 156.577126] do_page_fault+0x32/0x140
[ 156.577126] ? async_page_fault+0x8/0x30
[ 156.577127] async_page_fault+0x1e/0x30
[ 156.577127] RIP: 0033:0x401840
[ 156.577128] Code: 00 00 45 31 c9 31 ff 41 b8 ff ff ff ff b9 22 00
00 00 ba 03 00 00 00 be 00 00 00 08 e8 d9 f5 ff ff 48 83 f8 ff 74 2b
48 89 c2 <c6> 02 00 48 01 ea 48 83 03 01 48 89 d1 48 29 c1 48 81 f9 ff
ff ff
[ 156.577128] RSP: 002b:00007fffffffc0a0 EFLAGS: 00010293
[ 156.577129] RAX: 00007fffeee48000 RBX: 00007ffff7ff7180 RCX: 0000000004b42000
[ 156.577129] RDX: 00007ffff398a000 RSI: 0000000008000000 RDI: 0000000000000000
[ 156.577130] RBP: 0000000000001000 R08: ffffffffffffffff R09: 0000000000000000
[ 156.577130] R10: 0000000000000022 R11: 0000000000000246 R12: 00007fffffffc240
[ 156.577130] R13: 0000000000000000 R14: 000000000060db00 R15: 0000000000000005
-- After the above two it starts spitting this one out every 10 - 30
seconds or so --
[ 183.788386] watchdog: BUG: soft lockup - CPU#14 stuck for 23s!
[kworker/14:1:121]
[ 183.790003] Modules linked in: ip6t_rpfilter ip6t_REJECT
nf_reject_ipv6 xt_conntrack ip_set nfnetlink ebtable_nat
ebtable_broute bridge stp llc ip6table_nat nf_nat_ipv6 ip6table_mangle
ip6table_raw ip6table_security iptable_nat nf_nat_ipv4 nf_nat
nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 iptable_mangle iptable_raw
iptable_security ebtable_filter ebtables ip6table_filter ip6_tables
sunrpc sb_edac crct10dif_pclmul crc32_pclmul ghash_clmulni_intel
kvm_intel kvm ppdev irqbypass parport_pc joydev virtio_balloon
pcc_cpufreq i2c_piix4 pcspkr parport xfs libcrc32c cirrus
drm_kms_helper ttm drm e1000 crc32c_intel virtio_blk ata_generic
floppy serio_raw pata_acpi qemu_fw_cfg
[ 183.799984] CPU: 14 PID: 121 Comm: kworker/14:1 Tainted: G D
5.0.0-rc7-next-20190219-baseline+ #50
[ 183.801674] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS Bochs 01/01/2011
[ 183.803078] Workqueue: events netstamp_clear
[ 183.803873] RIP: 0010:smp_call_function_many+0x206/0x260
[ 183.804847] Code: e8 0f 97 7c 00 3b 05 bd d1 1e 01 0f 83 7c fe ff
ff 48 63 d0 48 8b 4d 00 48 03 0c d5 80 28 18 9e 8b 51 18 83 e2 01 74
0a f3 90 <8b> 51 18 83 e2 01 75 f6 eb c7 0f b6 4c 24 0c 48 83 c4 10 89
ef 5b
[ 183.808273] RSP: 0018:ffffb9a8c35a3d38 EFLAGS: 00000202 ORIG_RAX:
ffffffffffffff13
[ 183.809662] RAX: 0000000000000000 RBX: ffffa000dfba9d88 RCX: ffffa000df8301c0
[ 183.810971] RDX: 0000000000000001 RSI: 0000000000000100 RDI: ffffa000dfba9d88
[ 183.812268] RBP: ffffa000dfba9d80 R08: 0000000000000000 R09: 0000000000003fff
[ 183.813582] R10: 0000000000000000 R11: 000000000000000f R12: ffffffff9d02f690
[ 183.814884] R13: 0000000000000000 R14: ffffa000dfba9da8 R15: 0000000000000100
[ 183.816195] FS: 0000000000000000(0000) GS:ffffa000dfb80000(0000)
knlGS:0000000000000000
[ 183.817673] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 183.818729] CR2: 00007ffff704b080 CR3: 0000000814c48001 CR4: 0000000000160ee0
[ 183.820038] Call Trace:
[ 183.820510] ? netif_receive_skb_list+0x68/0x4a0
[ 183.821367] ? poke_int3_handler+0x40/0x40
[ 183.822126] ? netif_receive_skb_list+0x69/0x4a0
[ 183.822975] on_each_cpu+0x28/0x60
[ 183.823611] ? netif_receive_skb_list+0x68/0x4a0
[ 183.824467] text_poke_bp+0x68/0xe0
[ 183.825126] ? netif_receive_skb_list+0x68/0x4a0
[ 183.825983] __jump_label_transform+0x101/0x140
[ 183.826829] arch_jump_label_transform+0x26/0x40
[ 183.827687] __jump_label_update+0x56/0xc0
[ 183.828456] static_key_enable_cpuslocked+0x57/0x80
[ 183.829358] static_key_enable+0x16/0x20
[ 183.830085] process_one_work+0x16c/0x380
[ 183.830831] worker_thread+0x49/0x3e0
[ 183.831516] kthread+0xf8/0x130
[ 183.832106] ? rescuer_thread+0x340/0x340
[ 183.832848] ? kthread_bind+0x10/0x10
[ 183.833532] ret_from_fork+0x35/0x40
