From: "Toralf Förster" <toralf.foerster@gmx.de>
To: richard -rw- weinberger <richard.weinberger@gmail.com>
Cc: "user-mode-linux-devel@lists.sourceforge.net"
<user-mode-linux-devel@lists.sourceforge.net>
Subject: Re: [uml-devel] WARNING: at mm/mmap.c:2757 exit_mmap+0x161/0x170()
Date: Wed, 15 May 2013 21:06:15 +0200 [thread overview]
Message-ID: <5193DCA7.1070708@gmx.de> (raw)
In-Reply-To: <CAFLxGvx-saWcJ+JCubUBAVT70OSMZDYNETqiNijJgXeqCPwwUA@mail.gmail.com>
On 05/13/2013 09:12 AM, richard -rw- weinberger wrote:
> This looks like another issue.
> Are you testing process_vm_writev() with trinity?
> Looks like it managed to overwrite the stub page of a process, which
> is not good.
nope, it is the mremap syscall.
A command like
$>trinity -c mremap -N 10
immediately after starting a 32 bit Gentoo linux guest with current kernel 3.10-rc1-... +
strnlen + stub4 patch works, but later a
$>trinity -c mremap -N 1000
yields into
2013-05-15T21:02:04.061+02:00 trinity kernel: Stub registers -
2013-05-15T21:02:04.061+02:00 trinity kernel: 0 - 100000
2013-05-15T21:02:04.061+02:00 trinity kernel: 1 - 300000
2013-05-15T21:02:04.061+02:00 trinity kernel: 2 - 0
2013-05-15T21:02:04.061+02:00 trinity kernel: 3 - 0
2013-05-15T21:02:04.061+02:00 trinity kernel: 4 - 0
2013-05-15T21:02:04.061+02:00 trinity kernel: 5 - 0
2013-05-15T21:02:04.061+02:00 trinity kernel: 6 - 0
2013-05-15T21:02:04.061+02:00 trinity kernel: 7 - 7b
2013-05-15T21:02:04.061+02:00 trinity kernel: 8 - 7b
2013-05-15T21:02:04.065+02:00 trinity kernel: 9 - 0
2013-05-15T21:02:04.065+02:00 trinity kernel: 10 - 33
2013-05-15T21:02:04.065+02:00 trinity kernel: 11 - ffffffff
2013-05-15T21:02:04.065+02:00 trinity kernel: 12 - 1000c3
2013-05-15T21:02:04.065+02:00 trinity kernel: 13 - 73
2013-05-15T21:02:04.065+02:00 trinity kernel: 14 - 10206
2013-05-15T21:02:04.065+02:00 trinity kernel: 15 - 101028
2013-05-15T21:02:04.065+02:00 trinity kernel: 16 - 7b
2013-05-15T21:02:04.065+02:00 trinity kernel: wait_stub_done : failed to wait for SIGTRAP, pid = 15692, n = 15692, errno = 0, status = 0xb7f
and now that process can't be killed - I had to stop the UML guest.
--
MfG/Sincerely
Toralf Förster
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next prev parent reply other threads:[~2013-05-15 19:06 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-12 15:47 [uml-devel] WARNING: at mm/mmap.c:2757 exit_mmap+0x161/0x170() Toralf Förster
2013-05-12 15:58 ` richard -rw- weinberger
2013-05-12 16:08 ` Toralf Förster
2013-05-12 16:10 ` richard -rw- weinberger
2013-05-12 16:31 ` richard -rw- weinberger
2013-05-12 18:13 ` Toralf Förster
2013-05-12 18:45 ` Toralf Förster
2013-05-12 19:45 ` richard -rw- weinberger
2013-05-12 19:53 ` Toralf Förster
2013-05-12 19:56 ` richard -rw- weinberger
2013-05-12 20:29 ` Toralf Förster
2013-05-12 20:31 ` richard -rw- weinberger
2013-05-12 21:28 ` richard -rw- weinberger
2013-05-12 22:13 ` Toralf Förster
2013-05-13 7:12 ` richard -rw- weinberger
2013-05-13 18:00 ` Toralf Förster
2013-05-15 19:06 ` Toralf Förster [this message]
2013-05-15 19:11 ` richard -rw- weinberger
2013-05-15 19:30 ` Toralf Förster
2013-05-15 19:35 ` richard -rw- weinberger
2013-05-17 10:00 ` richard -rw- weinberger
2013-05-17 12:22 ` richard -rw- weinberger
2013-05-17 14:28 ` Toralf Förster
2013-05-17 14:50 ` Richard RW. Weinberger
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