One more kcrash file attached, also from mdhayter@.
He says he was watching free swap on top and it showed 5 Gb, but the crash dump has 0 swap free, so something ate it up really fast. 

Feedback link: https://feedback.corp.google.com/product/208/neutron?lView=rd&lReport=52931187990


<4>[ 1787.816153] DMA: 3*4kB (U) 0*8kB 1*16kB (U) 0*32kB 1*64kB (U) 1*128kB (U) 1*256kB (U) 0*512kB 1*1024kB (U) 1*2048kB (U) 3*4096kB (MR) = 15836kB
<4>[ 1787.816196] DMA32: 195*4kB (UE) 94*8kB (UE) 1899*16kB (UEM) 1020*32kB (UEM) 8*64kB (UEM) 2*128kB (E) 0*256kB 0*512kB 0*1024kB 0*2048kB 2*4096kB (R) = 73516kB
<4>[ 1787.816232] Normal: 9697*4kB (UEM) 2302*8kB (UEM) 116*16kB (UEM) 50*32kB (UEM) 2*64kB (E) 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 2*4096kB (R) = 68980kB
<4>[ 1787.816268] 30148 total pagecache pages
<4>[ 1787.816273] 680 pages in swap cache
<4>[ 1787.816279] Swap cache stats: add 1678472, delete 1677792, find 2210/113486
<4>[ 1787.816286] Free swap = 0kB
<4>[ 1787.816290] Total swap = 5771000kB
<4>[ 1787.816294] 1022443 pages RAM
<4>[ 1787.816299] 0 pages HighMem/MovableOnly
<4>[ 1787.816304] 37525 pages reserved
<6>[ 1787.816308] [ pid ] uid tgid total_vm rss nr_ptes swapents oom_score_adj name

Deleted: upload_file_kcrash-98870b5c80000000.kcrash 260 KB

upload_file_kcrash-98870b5c80000000.kcrash 260 KB Download

One more time from Alberto:

https://feedback.corp.google.com/#/Report/53001330528


[17280.244180] Code: 48 89 e5 e8 ae ff ff ff 5d c3 0f 1f 44 00 00 55 65 ff 04 25 d0 a8 00 00 48 89 e5 65 8b 34 25 2c a0 00 00 66 66 90 0f ae e8 0f 31 <89> c1 66 66 90 0f ae e8 0f 31 89 c0 48 c1 e2 20 48 09 c2 89 d0 
[17280.244249] NMI backtrace for cpu 2
[17280.244265] CPU: 2 PID: 620 Comm: rs:main Q:Reg Not tainted 3.18.0-13527-gc2f2230 #1
[17280.244293] Hardware name: Google Caroline/Caroline, BIOS Google_Caroline.7820.254.0 01/18/2017
[17280.244322] task: ffff880075304900 ti: ffff880075390000 task.ti: ffff880075390000
[17280.244348] RIP: 0033:[<00007f0ff6aa8681>]  [<00007f0ff6aa8681>] 0x7f0ff6aa8681
[17280.244374] RSP: 002b:00007f0ff62d09e0  EFLAGS: 00000246
[17280.244395] RAX: 0000000000000001 RBX: 00007f0ff0003fe0 RCX: 0000000000000001
[17280.244421] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
[17280.244446] RBP: 00007f0ff62d0a20 R08: 00007f0ff0003fe0 R09: 0000000000000000
[17280.244472] R10: 000000000000001b R11: 00007f0ff0004010 R12: 00007f0ff62d0a40
[17280.244497] R13: 00007f0ff62d0a90 R14: 00007f0ff62d0a88 R15: 00007f0ff8869010
[17280.244523] FS:  00007f0ff62d1700(0000) GS:ffff88017ed00000(0000) knlGS:0000000000000000
[17280.244551] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[17280.244573] CR2: 00000fd447eb3008 CR3: 0000000074868000 CR4: 00000000003407e0
[17280.244597] 
[17280.244608] NMI backtrace for cpu 3
[17280.244624] CPU: 3 PID: 28221 Comm: chrome Not tainted 3.18.0-13527-gc2f2230 #1
[17280.244653] Hardware name: Google Caroline/Caroline, BIOS Google_Caroline.7820.254.0 01/18/2017
[17280.244682] task: ffff880116763fe0 ti: ffff880102e98000 task.ti: ffff880102e98000
[17280.244709] RIP: 0033:[<00007fbb68ab300a>]  [<00007fbb68ab300a>] 0x7fbb68ab300a
[17280.244734] RSP: 002b:00007ffcd267f078  EFLAGS: 00000202
[17280.244755] RAX: 00000bf69fc89d80 RBX: 0000000000000008 RCX: 0000000000000003
[17280.244781] RDX: 0000000000000000 RSI: 00000bf69fd15540 RDI: 00007fbb6eb0fe00
[17280.244808] RBP: 00007ffcd267f0f0 R08: 00000bf69fc89e40 R09: 00000bf69fc89e10
[17280.244833] R10: 00000bf69fc89e28 R11: 00000bf69fc89e40 R12: 00000000000000c0
[17280.244858] R13: 00000bf69fab00f8 R14: 00000bf69fab00f8 R15: 00000bf69fb88b00
[17280.244883] FS:  00007fbb66203740(0000) GS:ffff88017ed80000(0000) knlGS:0000000000000000
[17280.244911] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[17280.244933] CR2: 00000bf6a472e000 CR3: 0000000101574000 CR4: 00000000003407e0
[17280.244957] 
[17280.244970] Kernel panic - not syncing: hung_task: blocked tasks
[17280.244998] CPU: 1 PID: 31 Comm: khungtaskd Not tainted 3.18.0-13527-gc2f2230 #1
[17280.245025] Hardware name: Google Caroline/Caroline, BIOS Google_Caroline.7820.254.0 01/18/2017
[17280.245054]  0000000000000000 00000000af350848 ffff88017982bda8 ffffffffa729a727
[17280.245094]  0000000000000000 ffffffffa75a648a ffff88017982be28 ffffffffa72993d6
[17280.245133]  ffff880100000008 ffff88017982be38 ffff88017982bdd8 00000000af350848
[17280.245173] Call Trace:
[17280.245195]  [<ffffffffa729a727>] dump_stack+0x4e/0x71
[17280.245223]  [<ffffffffa72993d6>] panic+0xcd/0x1e3
[17280.245252]  [<ffffffffa6cddde6>] watchdog+0x282/0x300
[17280.245280]  [<ffffffffa6cddb64>] ? reset_hung_task_detector+0x15/0x15
[17280.245310]  [<ffffffffa6c7c3d2>] kthread+0x10e/0x116
[17280.245339]  [<ffffffffa6c7c2c4>] ? __kthread_parkme+0x67/0x67
[17280.245368]  [<ffffffffa729f8ac>] ret_from_fork+0x7c/0xb0
[17280.245396]  [<ffffffffa6c7c2c4>] ? __kthread_parkme+0x67/0x67
[17280.245432] Kernel Offset: 0x25c00000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
[17280.248000] gsmi: Log Shutdown Reason 0x02
[17280.277761] ACPI MEMORY or I/O RESET_REG.

Some more reports from aamir@'s machine: 
crash/78e376d580000000
crash/44f120ec80000000
crash/0f9120ec80000000

other reports from mdhayter@'s DUT
crash/9f6fe55c80000000
crash/98870b5c80000000
crash/137817fc80000000

Hung task from edoan

https://feedback.corp.google.com/#/Report/54292508754

sounds like  crbug.com/696055 

Observed on Kevin with version 9731.0.0, 61.0.3152.0
crash ID: 4a9e00be40000000

Kevin reboot due to hung tasks 9752.0.0, 61.0.3159.0
Crash id: 8143f74c88000000