UserAgent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:50.0) Gecko/20100101 Firefox/50.0

Steps to reproduce the problem:
1. Open chrome://plugins/ in tab
2. Disable/Enable Flash plugin
3. Open another tab
4. Close tab in which chrome://plugins/ is opened

What is the expected behavior?
Should not cause heap-use-after-free

What went wrong?
==1136==ERROR: AddressSanitizer: heap-use-after-free on address 0x0920ff44 at pc 0x12c28ed9 bp 0x00d7e65c sp 0x00d7e650
READ of size 4 at 0x0920ff44 thread T0
    #0 0x12c28ed8  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x133f8ed8)
    #1 0x18452950  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x18c22950)
    #2 0x1ce35d56  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x1d605d56)
    #3 0x16640d2a  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x16e10d2a)
    #4 0x14e33fbb  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x15603fbb)
    #5 0x14e3412d  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x1560412d)
    #6 0x14c20fcd  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x153f0fcd)
    #7 0x14c1e6ea  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x153ee6ea)
    #8 0x1c87bc6c  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x1d04bc6c)
    #9 0x18d445f0  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x195145f0)
    #10 0x1c827e88  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x1cff7e88)
    #11 0x14a721b7  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x152421b7)
    #12 0x14a73a4f  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x15243a4f)
    #13 0x14a71d04  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x15241d04)
    #14 0xf8311d7  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x100011d7)
    #15 0x6a5ab  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome.exe+0x40a5ab)
    #16 0x61b27  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome.exe+0x401b27)
    #17 0x4cca8c  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome.exe+0x86ca8c)
    #18 0x77513389  (C:\Windows\syswow64\kernel32.dll+0x7dd73389)
    #19 0x77af9901  (C:\Windows\SysWOW64\ntdll.dll+0x7dea9901)
    #20 0x77af98d4  (C:\Windows\SysWOW64\ntdll.dll+0x7dea98d4)

0x0920ff44 is located 3396 bytes inside of 17648-byte region [0x0920f200,0x092136f0)
freed by thread T0 here:
    #0 0x4b0d78  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome.exe+0x850d78)
    #1 0x12c15cf5  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x133e5cf5)
    #2 0x1845526c  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x18c2526c)
    #3 0x193ca6c5  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x19b9a6c5)
    #4 0x193cadcf  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x19b9adcf)
    #5 0x193c6dc3  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x19b96dc3)
    #6 0x1925eeb3  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x19a2eeb3)
    #7 0x1c87bc1a  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x1d04bc1a)
    #8 0x18d445f0  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x195145f0)
    #9 0x1c827e88  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x1cff7e88)
    #10 0x14a721b7  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x152421b7)
    #11 0x14a73a4f  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x15243a4f)
    #12 0x14a71d04  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x15241d04)
    #13 0xf8311d7  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x100011d7)
    #14 0x6a5ab  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome.exe+0x40a5ab)
    #15 0x61b27  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome.exe+0x401b27)
    #16 0x4cca8c  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome.exe+0x86ca8c)
    #17 0x77513389  (C:\Windows\syswow64\kernel32.dll+0x7dd73389)
    #18 0x77af9901  (C:\Windows\SysWOW64\ntdll.dll+0x7dea9901)
    #19 0x77af98d4  (C:\Windows\SysWOW64\ntdll.dll+0x7dea98d4)

previously allocated by thread T0 here:
    #0 0x4b0e5c  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome.exe+0x850e5c)
    #1 0x1fd6f4d2  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x2053f4d2)
    #2 0x1180b105  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x11fdb105)
    #3 0x18454d5d  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x18c24d5d)
    #4 0x18454b3c  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x18c24b3c)
    #5 0x193c9d8b  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x19b99d8b)
    #6 0x193ca75a  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x19b9a75a)
    #7 0x193c5a71  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x19b95a71)
    #8 0x1925eba5  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x19a2eba5)
    #9 0x1c874d1e  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x1d044d1e)
    #10 0x1c870df0  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x1d040df0)
    #11 0x1c86fe8f  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x1d03fe8f)
    #12 0x1c86f213  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x1d03f213)
    #13 0x1c827d2a  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x1cff7d2a)
    #14 0x14a721b7  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x152421b7)
    #15 0x14a73a4f  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x15243a4f)
    #16 0x14a71d04  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x15241d04)
    #17 0xf8311d7  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x100011d7)
    #18 0x6a5ab  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome.exe+0x40a5ab)
    #19 0x61b27  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome.exe+0x401b27)
    #20 0x4cca8c  (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome.exe+0x86ca8c)
    #21 0x77513389  (C:\Windows\syswow64\kernel32.dll+0x7dd73389)
    #22 0x77af9901  (C:\Windows\SysWOW64\ntdll.dll+0x7dea9901)
    #23 0x77af98d4  (C:\Windows\SysWOW64\ntdll.dll+0x7dea98d4)

SUMMARY: AddressSanitizer: heap-use-after-free (D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome_child.dll+0x133f8ed8)
Shadow bytes around the buggy address:
  0x31241f90: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x31241fa0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x31241fb0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x31241fc0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x31241fd0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
=>0x31241fe0: fd fd fd fd fd fd fd fd[fd]fd fd fd fd fd fd fd
  0x31241ff0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x31242000: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x31242010: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x31242020: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x31242030: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07
  Heap left redzone:       fa
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
==1136==ABORTING

Did this work before? N/A 

Chrome version: Chromium	57.0.2927.0 (Developer Build) (32-bit) Revision	02691189bd4100f6fb137625730deb528285e3a8-refs/heads/master@{#433514} OS	Windows  JavaScript	V8 5.7.3 Flash	22.0.0.209 User Agent	Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2927.0 Safari/537.36 Command Line	chrome.exe --no-sandbox --flag-switches-begin --flag-switches-end Executable Path	D:\win32-release_asan-win32-release-433514\asan-win32-release-433514\chrome.exe Profile Path	C:\Users\Die-Hard\AppData\Local\Chromium\User Data\Default Variations	90757ebb-3f4a17df b3888d8d-afba0f91 74785582-3f4a17df 241fff6c-ca7d8d80 1e528f0f-15305a2 2a33b90e-3f4a17df cdd7eadf-f5ae51c9 ba3f87da-a6404135 775ebbd7-3f4a17df 76b48ab8-a2567007 9d315c2-ca7d8d80 5274eb09-3f4a17df 8ca44045-3f4a17df 9773d3bd-3f4a17df 93731dca-3f4a17df 2e109477-e2e291f1 1d3ad72e-3f4a17df 9e243dd-3f4a17df 64cbdfc2-3f4a17df 6b121ae7-3f4a17df 5139837c-3f4a17df 7f8176d9-3f4a17df f79cb77b-3d47f4f4 b7786474-d93a0620 23a898eb-e0e2610f 7382e39a-3f4a17df 868bda90-3f4a17df 630a1b64-3f4a17df 4ea303a6-3f4a17df ce152c12-3f4a17df 3a007b7-3f4a17df 9736de91-3f4a17df dbffab5d-f51b51 64005e71-fb487281 3326cd71-3f4a17df b2612322-8a9180b2 ca314179-ea08a3f2 c5073fab-3f4a17df 867c4c68-3f4a17df 7fc902e8-3f4a17df d747916f-d747916f 477f6800-72c07fe0 6844d8aa-669a04e0 fe05be5f-4ad60575 828a5926-d8f52f32 Compiler	clang  Channel: n/a
OS Version: 6.1 (Windows 7, Windows Server 2008 R2)
Flash Version: Flash	22.0.0.209

This probably not security issue but still flagged for safe side.