karmic has seen the end of its life and is no longer receiving any
updates. Marking the karmic task for this ticket as "Won't Fix".
** Changed in: linux-mvl-dove (Ubuntu Karmic)
Status: Triaged => Won't Fix
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karmic has seen the end of its life and is no longer receiving any
updates. Marking the karmic task for this ticket as "Won't Fix".
** Changed in: linux-fsl-imx51 (Ubuntu Karmic)
Status: Triaged => Won't Fix
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** Branch linked: lp:ubuntu/linux-fsl-imx51
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ARM architecture lacks support for pselect() and ppoll()
https://bugs.launchpad.net/bugs/319729
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This bug was fixed in the package linux-fsl-imx51 - 2.6.31-605.9
---
linux-fsl-imx51 (2.6.31-605.9) lucid; urgency=low
[ Andy Whitcroft ]
* Revert "include modules.builtin in the binary debs"
* include modules.builtin in the binary debs
[ Bryan Wu ]
* SAUCE: IMX51: skip A
Re-assigning it to Bryan
** Changed in: linux-fsl-imx51 (Ubuntu)
Milestone: lucid-alpha-1 => None
** Changed in: linux-fsl-imx51 (Ubuntu)
Assignee: Amit Kucheria (amitk) => Bryan Wu (cooloney)
** Changed in: linux-mvl-dove (Ubuntu)
Milestone: lucid-alpha-1 => None
** Changed in: li
Scott mentioned that upstart is not as dependent on ppoll/pselect as it
once was so it shouldn't be a problem anymore.
The ppoll/pselect patch is now upstream in 2.6.32
(369842658a36bcea28ecb643ba4bdb53919330dd). If we feel the need, it can
be cherry-picked into the Karmic ARM kernels (Marvell and
Are there any plans for an SRU here since Karmic should still benefit
from this?
** Changed in: linux-fsl-imx51 (Ubuntu Karmic)
Importance: Undecided => Wishlist
** Changed in: linux-fsl-imx51 (Ubuntu Karmic)
Status: New => Triaged
** Changed in: linux-mvl-dove (Ubuntu Karmic)
Impor
Marking won't fix for Jaunty. This will be in Lucid from a different
patch from upstream.
** Changed in: linux (Ubuntu Jaunty)
Status: In Progress => Won't Fix
** Changed in: linux-fsl-imx51 (Ubuntu)
Status: In Progress => Won't Fix
** Changed in: linux-fsl-imx51 (Ubuntu Jaunty)
Attached a new testcase. Rather than use the libc pselect() wrapper, the
new testcase has its own wrapper for pselect.
Compile with:
gcc -o childspin -DUSE_PSELECT_WRAPPER -Wall childspin.c
Running this on a patched kernel (from Amit's comment 16), the program
does not show the blocking behavio
On Tue, 2009-10-13 at 13:27 +, Amit Kucheria wrote:
> We've survived this far w/o the patch. Now Jeremy is looking at the
> glibc side as well. Marking down the importance.
>
udev is a lot less sensitive to this now, the side effect won't be a
stuck boot, just a bunch of zombie worker process
We've survived this far w/o the patch. Now Jeremy is looking at the
glibc side as well. Marking down the importance.
** Changed in: linux-mvl-dove (Ubuntu Jaunty)
Importance: High => Undecided
** Changed in: linux-mvl-dove (Ubuntu)
Importance: High => Wishlist
** Changed in: linux-fsl-imx5
Looks like the glibc syscall wrapper is getting in the way here; the
test run in my previous comment was still using select() even though
pselect is available. Once I get hold of some hardware, will do some
hacking with the wrapper components.
--
ARM architecture lacks support for pselect() and p
Just tried the attached build, and the childspin example still hangs.
However, it looks like it's waiting somewhere in do_exit, rather than
the previous deadlock, which seems to be waiting in
poll_schedule_timeout
Will see if I can find more about what's happening here.
--
ARM architecture lacks
The bug does not exist in the Karmic 'master' branch since arm support
is in soc-specific topic branches in Karmic.
** Changed in: linux (Ubuntu)
Status: In Progress => Invalid
** Changed in: linux (Ubuntu)
Milestone: jaunty-updates => None
** Also affects: linux-mvl-dove (Ubuntu)
Jaunty does not have support for the Marvell Dove platform
** Changed in: linux-mvl-dove (Ubuntu Jaunty)
Status: New => Invalid
** Changed in: linux-fsl-imx51 (Ubuntu)
Status: New => In Progress
** Changed in: linux-fsl-imx51 (Ubuntu Jaunty)
Status: New => In Progress
** Ch
Number one priority obviously got reprioritized :-/
Anyways, I finally have a patch that I would appreciate some testing on.
Please apply the attached patch to a recent kernel (2.6.30+) and try the
test program (childspin.c) attached to this bug on an arm board. You
ought to be able to test this o
On 09 Jun 16, Dave Martin wrote:
> A clarification in relation to my historical comments on this thread
> (https://bugs.launchpad.net/ubuntu/+source/linux/+bug/319729/comments/11),
> the problem I observed where init sometimes stops respawning terminal
> logins is _not_ caused by a pselect-style ra
A clarification in relation to my historical comments on this thread
(https://bugs.launchpad.net/ubuntu/+source/linux/+bug/319729/comments/11),
the problem I observed where init sometimes stops respawning terminal
logins is _not_ caused by a pselect-style race. It's a separate issue
to do with hot
** Tags added: armel
** Tags removed: arm
--
ARM architecture lacks support for pselect() and ppoll()
https://bugs.launchpad.net/bugs/319729
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I can't start an installed versatile image in qemu; switching to
sysvinit fixes the problem for me.
--
ARM architecture lacks support for pselect() and ppoll()
https://bugs.launchpad.net/bugs/319729
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Added to the release notes:
Occasional hangs possible on ARM architecture
The ARM port currently does not support the ppoll() & pselect() system
syscalls, which will sometimes cause a failure to mount the root
filesystem on boot. This is a race condition, and retrying the boot will
usually clear
** Changed in: linux (Ubuntu Jaunty)
Status: New => In Progress
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ARM architecture lacks support for pselect() and ppoll()
https://bugs.launchpad.net/bugs/319729
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** Changed in: linux (Ubuntu Jaunty)
Status: Triaged => New
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ARM architecture lacks support for pselect() and ppoll()
https://bugs.launchpad.net/bugs/319729
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Note that epoll_pwait is also affected (fairly easy to spot in
asm/unistd.h)
I may have now experienced an occurrence of this race bug: namely, init
stopped respawning terminal logins for no obvious reason. init was
definitely waiting in select, but unfortunately I accidentally rebooted
the syste
Joseph S. Myers kindly pointed me at http://www.spinics.net/lists/arm-
kernel/msg38114.html which just one of the implementations which were
proposed for these syscalls. Can we consider its technical quality and
whether it helps passing the test case?
--
ARM architecture lacks support for pselec
** Tags added: arm
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ARM architecture lacks support for pselect() and ppoll()
https://bugs.launchpad.net/bugs/319729
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Sample release note text:
The ARM port currently does not support the ppoll() & pselect() system
syscalls. This will exhibit itself by failing to mount the root
filesystem. This is a race condition and retrying the boot will usually
clear the problem. The work to add the syscalls is currently unde
Decided to release as an update to Jaunty once the syscalls are
implemented.
** Changed in: linux (Ubuntu Jaunty)
Target: ubuntu-9.04-beta => jaunty-updates
--
ARM architecture lacks support for pselect() and ppoll()
https://bugs.launchpad.net/bugs/319729
You received this bug notificatio
As the program demonstrates, the biggest problem is missed SIGCHLDs.
I'm actually quite surprised by how fast the program demonstrates the
problem, I was actually expecting you to need to run it for a minute or
two before a hang happens. For me, it hangs within mere hundreds of
iterations.
The w
Sample program from Scott to trigger the problem
< Keybuk> http://people.ubuntu.com/~scott/childspin.c
< Keybuk> This will demonstrate the race
< Keybuk> on a machine with a properly implemented pselect(), you will just get
continuous .s
< Keybuk> on a machine with a race condition, it will hang
On Thu, 2009-02-19 at 12:54 +, Amit Kucheria wrote:
> Could we please have a sample program that will trigger this bug? That
> carries more weight when posting to the kernel lists than just asking
> why it isn't implemented.
>
It's a race condition. It's difficult to write a program guarante
Ohh, and I haven't received any reply to my query on the ARM lists yet.
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ARM architecture lacks support for pselect() and ppoll()
https://bugs.launchpad.net/bugs/319729
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Could we please have a sample program that will trigger this bug? That
carries more weight when posting to the kernel lists than just asking
why it isn't implemented.
/Amit
--
ARM architecture lacks support for pselect() and ppoll()
https://bugs.launchpad.net/bugs/319729
You received this bug no
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Amit Kucheria (amitk)
Target: None => ubuntu-9.04-beta
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ARM architecture lacks support for pselect() and ppoll()
https://bugs.launchpad.net/bugs/319729
You received this bug notification because you are a member of Ubuntu
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On Fri, 2009-01-23 at 21:52 +, Michael Casadevall wrote:
> glibc does not autodetect the presence of this call (possibly because
> depending on the architecture, the number of arguments change (since
> some arches can't hand 7 argument syscalls), so it will also have be
> modified to use the k
Taking a look at the kernel source, the syscall id numbers for both
ppoll and pselect are properly reserved for ARM. The pselect function
(sys_pselect7) is defined in fs/select.c; it is a C function with no
specific arch dependent bits, but does require the sigmask_set_restore
function to be availa
** Changed in: linux (Ubuntu)
Status: New => Triaged
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ARM architecture lacks support for pselect() and ppoll()
https://bugs.launchpad.net/bugs/319729
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