From: Nathan March <nathan@gt.net>
To: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>
Subject: Re: Creating a vm with a non-existent /dev/mapper/ tap2 device effectively hangs dom0 system
Date: Thu, 28 Jul 2011 12:00:53 -0700 [thread overview]
Message-ID: <4E31B1E5.5080500@gt.net> (raw)
In-Reply-To: <4E309F77.2040903@gt.net>
On 7/27/2011 4:29 PM, Nathan March wrote:
> Have an interesting one here, originally found on xen 4.1.0 but just
> upgraded to xen 4.1.1 and it's still here.
>
> Creating a VM with a tap2 device pointed at /dev/mapper/something,
> when that device doesn't exist, causes the tapdisk2 process to go into
> D mode and also manages to take out any process that queries it.
>
This also happens on proper shutdown of a VM, so I must have done
something crazy to the setup here since other people haven't been
complaining. If I start a VM, strace it's tapdisk2 and then send the VM
a shutdown, the strace shows tapdisk2 hanging here:
12037 gettimeofday({1311879426, 739622}, NULL) = 0
12037 gettimeofday({1311879426, 739717}, NULL) = 0
12037 select(8, [3 4 7], [], [], {600, 0}) = 1 (in [3], left {599, 993029})
12037 gettimeofday({1311879426, 746896}, NULL) = 0
12037 accept(3, 0, NULL) = 6
12037 gettimeofday({1311879426, 747079}, NULL) = 0
12037 gettimeofday({1311879426, 747169}, NULL) = 0
12037 gettimeofday({1311879426, 747257}, NULL) = 0
12037 select(8, [3 4 6 7], [], [], {600, 0}) = 1 (in [6], left {599,
999948})
12037 gettimeofday({1311879426, 747544}, NULL) = 0
12037 select(7, [6], NULL, NULL, {2, 0}) = 1 (in [6], left {1, 999998})
12037 read(6,
"\r\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0",
280) = 280
12037 gettimeofday({1311879426, 747932}, NULL) = 0
12037 sendto(5, "<30>Jul 28 11:57:06 tapdisk2[12036]: received 'close'
message (uuid = 0)\n", 73, MSG_NOSIGNAL, NULL, 0) = 73
12037 close(8) = 0
12037 gettimeofday({1311879426, 749118}, NULL) = 0
12037 sendto(5, "<30>Jul 28 11:57:06 tapdisk2[12036]: closed image
/dev/mapper/nathanxenuk1 (0 users, state: 0x00000000, type: 0)\n", 113,
MSG_NOSIGNAL, NULL, 0) = 113
12037 gettimeofday({1311879426, 749536}, NULL) = 0
12037 sendto(5, "<30>Jul 28 11:57:06 tapdisk2[12036]: sending 'close
response' message (uuid = 0)\n", 81, MSG_NOSIGNAL, NULL, 0) = 81
12037 select(7, NULL, [6], NULL, {2, 0}) = 1 (out [6], left {1, 999998})
12037 write(6,
"\16\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0",
280) = 280
12037 close(6) = 0
12037 gettimeofday({1311879426, 750295}, NULL) = 0
12037 gettimeofday({1311879426, 750384}, NULL) = 0
12037 select(8, [3 4 7], [], [], {600, 0}) = 1 (in [3], left {599, 999936})
12037 gettimeofday({1311879426, 750690}, NULL) = 0
12037 accept(3, 0, NULL) = 6
12037 gettimeofday({1311879426, 750801}, NULL) = 0
12037 gettimeofday({1311879426, 750854}, NULL) = 0
12037 gettimeofday({1311879426, 750905}, NULL) = 0
12037 select(8, [3 4 6 7], [], [], {600, 0}) = 1 (in [6], left {599,
999946})
12037 gettimeofday({1311879426, 751085}, NULL) = 0
12037 select(7, [6], NULL, NULL, {2, 0}) = 1 (in [6], left {1, 999998})
12037 read(6,
"\17\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0",
280) = 280
12037 gettimeofday({1311879426, 751550}, NULL) = 0
12037 sendto(5, "<30>Jul 28 11:57:06 tapdisk2[12036]: received 'detach'
message (uuid = 0)\n", 74, MSG_NOSIGNAL, NULL, 0) = 74
12037 close(7) = 0
12037 munmap(0x7ffc389d7000, 1445888
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
tapdisk2 12037 root cwd DIR 8,1 4096 2 /
tapdisk2 12037 root rtd DIR 8,1 4096 2 /
tapdisk2 12037 root txt REG 8,1 496268 180124
/usr/sbin/tapdisk2
tapdisk2 12037 root mem REG 8,1 1412272 268124
/lib64/libc-2.11.2.so
tapdisk2 12037 root mem REG 8,1 534648 267759
/lib64/libm-2.11.2.so
tapdisk2 12037 root mem REG 8,1 137732 267539
/lib64/libpthread-2.11.2.so
tapdisk2 12037 root mem REG 8,1 14512 267757
/lib64/libdl-2.11.2.so
tapdisk2 12037 root mem REG 8,1 164708 180168
/usr/lib64/libxenctrl.so.4.0.0
tapdisk2 12037 root mem REG 8,1 18832 267724
/lib64/libuuid.so.1.3.0
tapdisk2 12037 root mem REG 8,1 410267 180118
/usr/lib64/libvhd.so.1.0.0
tapdisk2 12037 root mem REG 8,1 88368 268110
/lib64/libz.so.1.2.3
tapdisk2 12037 root mem REG 8,1 35656 267750
/lib64/librt-2.11.2.so
tapdisk2 12037 root mem REG 8,1 128416 267762
/lib64/ld-2.11.2.so
tapdisk2 12037 root mem CHR 251,0 44028
/dev/xen/blktap-2/blktap0
tapdisk2 12037 root 0u CHR 1,3 0t0 1539 /dev/null
tapdisk2 12037 root 1u CHR 1,3 0t0 1539 /dev/null
tapdisk2 12037 root 2u CHR 1,3 0t0 1539 /dev/null
tapdisk2 12037 root 3u unix 0xffff880039c862c0 0t0 44033
/var/run/blktap-control/ctl12037
tapdisk2 12037 root 4u 0000 0,8 0 1000
anon_inode
tapdisk2 12037 root 5u unix 0xffff880039cbe840 0t0 44036 socket
tapdisk2 12037 root 7u CHR 251,0 0t0 44028
/dev/xen/blktap-2/blktap0
tapdisk2 12037 root 8u BLK 252,0 0t0 36899
/dev/mapper/nathanxenuk1
The /dev/mapper devices are coming from a dell md3200i, using open-iscsi
2.0.871 and multipath-tools-0.4.9-r2.
This is using the main xen 4.1.1 release, with jeremy's git dom0 kernel
(2.6.32.43).
Anyone have any idea what might be happening here?
- Nathan
next prev parent reply other threads:[~2011-07-28 19:00 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-27 23:29 Creating a vm with a non-existent /dev/mapper/ tap2 device effectively hangs dom0 system Nathan March
2011-07-28 19:00 ` Nathan March [this message]
2011-07-28 22:13 ` Nathan March
2011-07-29 16:23 ` Konrad Rzeszutek Wilk
2011-07-29 16:26 ` Nathan March
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4E31B1E5.5080500@gt.net \
--to=nathan@gt.net \
--cc=xen-devel@lists.xensource.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.