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From: Pavel Tatashin <pasha.tatashin@oracle.com>
Date: Thu, 4 Jan 2018 16:23:12 -0500
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Subject: Re: [PATCH 4.4 00/37] 4.4.110-stable review
To: Hugh Dickins <hughd@google.com>
Cc: Andy Lutomirski <luto@amacapital.net>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Thomas Voegtle <tv@lio96.de>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Guenter Roeck <linux@roeck-us.net>,
        Shuah Khan <shuahkh@osg.samsung.com>, patches@kernelci.org,
        Ben Hutchings <ben.hutchings@codethink.co.uk>,
        lkft-triage@lists.linaro.org, stable <stable@vger.kernel.org>
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I tried cherry picking
 435086b36f62 x86/vsyscall/64: Explicitly set _PAGE_USER in the
pagetable hierarchy

on top of 4.4.110-rc1, (needed to resolve a small 5level table to
4level page table conflict). Unfortunately, this does not solve the
panic/hanging problem I reported. For some reason I do not see the
panic message anymore. Machine hangs here:

[    5.023052] zswap: loaded using pool lzo/zbud
[    5.023063] page_owner is disabled
[    5.026492] Key type trusted registered
[    5.029325] Key type encrypted registered
[    5.029330] ima: No TPM chip found, activating TPM-bypass!
[    5.029365] evm: HMAC attrs: 0x1
[    5.034696] rtc_cmos 00:00: setting system clock to 2018-01-04
21:20:34 UTC (1515100834)
[    5.216862] Freeing unused kernel memory: 1856K
<hang>

And reboots after about half a minute.

Thank you,
Pavel