Date: Thu, 15 Jul 2004 10:24:39 -0400 (EDT) From: Robert Watson <rwatson@FreeBSD.org> To: current@FreeBSD.org Subject: 5.3-RELEASE TODO Message-ID: <200407151424.i6FEOdoq060881@fledge.watson.org>
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This is an automated bi-weekly mailing of the FreeBSD 5.3 open issues list.
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Automated mailing of this list will continue through the release of
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FreeBSD 5.3 Open Issues
Open Issues
This is a list of open issues that need to be resolved for FreeBSD 5.3. If
you have any updates for this list, please e-mail re@FreeBSD.org.
Show stopper defects for 5.3-RELEASE
+------------------------------------------------------------------------+
| Issue | Status | Responsible | Description |
|----------------+----------+--------------+-----------------------------|
| | | | The kernel random number |
| | | | generator requires either |
| | | | the yarrow subsystem to |
| | | | start or the user to tap on |
| /dev/random | | | the keyboard before it will |
| stalls single | | | deliver data to |
| user and | Unknown | Mark Murray | /dev/random. This results |
| sysinstall | | | in confusing behavior and |
| | | | strange messages when in |
| | | | single user mode, and makes |
| | | | sysinstall stall. |
| | | | Non-blocking behavior must |
| | | | be restored for 5.3. |
|----------------+----------+--------------+-----------------------------|
| | | | The current gcc snapshot |
| | | | includes regressions in |
| | | | alignment of floating point |
| | | | arguments, resulting in a |
| gcc 3.3 | | | substantial performance |
| floating point | Not done | | degradation. Newer gcc |
| alignment | | | 3.3.3 snapshots fix this, |
| regression | | | and must be imported before |
| | | | 5.3-RELEASE. If gcc-3.4 is |
| | | | imported instead, it must |
| | | | be checked for this |
| | | | regression. |
|----------------+----------+--------------+-----------------------------|
| | | | Recent re-introduction of |
| | | | PREEMPTION has resulted in |
| | | | reports of frequent hangs. |
| | | | This may be a combination |
| PREEMPTION | | | of bugs in scheduling and |
| triggers | Not done | John Baldwin | context switching, as well |
| frequent hangs | | | as existing bugs triggered |
| | | | by preemption. These |
| | | | problems must be corrected |
| | | | for 5.3-RELEASE (and |
| | | | ideally long before). |
+------------------------------------------------------------------------+
Required features for 5.3-RELEASE
+------------------------------------------------------------------------+
| Issue | Status | Responsible | Description | |
|----------------+-------------+-------------+-----------------------| |
| | | | GCC 3.4 is needed to | |
| | | | support TLS on all | |
| | | | our our Tier-1 | |
| GCC 3.4 for | | Alexander | platforms. It also is | |
| all platforms | In progress | Kabaev | likely to be better | |
| | | | maintained by the FSF | |
| | | | during the lifespan | |
| | | | on 5.x than GCC 3.3 | |
| | | | is. | |
|----------------+-------------+-------------+-----------------------| |
| GDB 6.1 kernel | | | GDB 6.1.1 import does | |
| debugging | In progress | Marcel | not include FreeBSD | |
| support | | Moolenaar | kernel debugging | |
| | | | support. | |
|----------------+-------------+-------------+-----------------------| |
| BIND9 import | | | BIND9 must be | |
| into 5-CURRENT | In progress | Doug Barton | imported for | |
| | | | 5.3-RELEASE. | |
|----------------+-------------+-------------+-----------------------| |
| | | | Kernel bits | |
| KSE support | | | implemented, userland | |
| for sparc64 | -- | -- | not implemented. | |
| | | | Required for | |
| | | | 5.3-RELEASE. | |
|----------------+-------------+-------------+-----------------------| |
| | | | Significant parts of | |
| | | | the network stack | |
| | | | (especially IPv4, | |
| | | | UNIX domain IPC, and | |
| | | | sockets) now have | |
| | | | fine-grained locking | |
| | | | of their data | |
| | | | structures. It's | |
| | | | possible to run many | |
| | | | common network | |
| | | | subsystems and | |
| | | | services without the | |
| Fine-grained | | | Giant lock. However, | |
| network stack | In progress | Robert | a number of device | |
| locking | | Watson | drivers and less | |
| without Giant | | | mainstream network | |
| | | | subsystems are | |
| | | | currently not MPSAFE. | |
| | | | By 5.3-RELEASE, it is | |
| | | | necessary to have the | |
| | | | vast majority of | |
| | | | network code running | |
| | | | without Giant, | |
| | | | including sockets, | |
| | | | permitting complete | |
| | | | local<->remote | |
| | | | delivery without | |
| | | | grabbing Giant. | |
|----------------+-------------+-------------+-----------------------| |
| | | | KLDs work when loaded | |
| | | | from userland, but | |
| | | David | not from the loader. | |
| kld support | In progress | O'Brien | kldxref might also | |
| for amd64 | | Peter Wemm | need work. Required | |
| | | | for amd64 to be | |
| | | | promoted to tier-1 | |
| | | | status. | |
|----------------+-------------+-------------+-----------------------| |
| | | | With improved support | |
| | | | for threading | |
| | | | primitives, support | |
| | | | is now required to | |
| GDB thread | | David | ease debugging of | |
| support | In progress | Xu,Marcel | threaded | |
| | | Moolenaar | applications. | |
| | | | Ideally, this support | |
| | | | will work for both | |
| | | | libthr and libkse | |
| | | | threading models. | |
|----------------+-------------+-------------+-----------------------| |
| | | | Currently, two | |
| | | | schedulers are | |
| | | | present: SCHED_ULE | |
| | | | (default), an | |
| | | | SMP-optimized | |
| | | | scheduler created as | |
| | | | part of SMPng, and | |
| | | | SCHED_4BSD, an | |
| | | | SMP-adapted version | |
| | | | of the original 4BSD | |
| | | | scheduler. They have | |
| | | | quite different | |
| | | | performance | |
| | | | properties, with ULE | |
| | | | providing strong | |
| | | | interactivity | |
| Scheduler | | | characteristics, and | |
| cleanup and | In progress | -- | performing quite well | |
| resolution | | | in a number of | |
| | | | benchmarks, and 4BSD | |
| | | | showing greater | |
| | | | strength in IPC | |
| | | | intensive user space | |
| | | | benchmarks, such as | |
| | | | databases. One of | |
| | | | these schedulers must | |
| | | | be the default for | |
| | | | 5.3, and whichever | |
| | | | one it is, it | |
| | | | requires careful | |
| | | | measurement, | |
| | | | analysis, and | |
| | | | optimization before | |
| | | | the release in order | |
| | | | to address its | |
| | | | defficiences. | |
|----------------+-------------+-------------+-----------------------+---|
| | | | There have been | |
| | | | several reports that | |
| | | | growfs(8) works | |
| | | | improperly with large | |
| Reports of | | | disk sizes, and other | |
| UFS2 "large | In progress | Scott Long | size-related nits in | > |
| disk" problems | | | the current disk and | |
| | | | label management tool | |
| | | | set. These must be | |
| | | | resolved for | |
| | | | 5.3-RELEASE. | |
+------------------------------------------------------------------------+
Desired features for 5.3-RELEASE
+------------------------------------------------------------------------+
| Issue | Status | Responsible | Description |
|-----------------+-------------+----------------+-----------------------|
| | | | All platforms but |
| | | | IA64 have |
| | | | modifications to |
| | | | support |
| | | | /libexec/ld.so in the |
| Completed | | | gcc base source tree; |
| compiler | | Alexander | changes for all |
| support for | -- | Kabaev and | FreeBSD platforms |
| dynamic root | | David O'Brien | have been merged back |
| | | | into the FSF 3.4 |
| | | | tree. They should be |
| | | | brought into FreeBSD |
| | | | on the vendor branch |
| | | | with a 3.4 import for |
| | | | 5.3-RELEASE. |
|-----------------+-------------+----------------+-----------------------|
| | | | Almost all process |
| | | | debugging tools have |
| | | | been updated to use |
| | | | non-procfs kernel |
| | | | primitives, with the |
| | | | exception of |
| | | | truss(1). As procfs |
| | | | is considered |
| | | | deprecated due to its |
| | | | inherent security |
| truss support | | | risks, it is highly |
| for ptrace | -- | -- | desirable to update |
| | | | truss to operate in a |
| | | | post-procfs world. |
| | | | Dag-Erling Smorgrav |
| | | | had prototype |
| | | | patches; |
| | | | Robert Drehmel is |
| | | | developing and |
| | | | testing patches now. |
| | | | Support for system |
| | | | call tracing has been |
| | | | added to ptrace(). |
|-----------------+-------------+----------------+-----------------------|
| | | | To complete support |
| | | | for thread-local |
| | | | storage on FreeBSD, |
| Per-platform | | Doug Rabson, | per-architecture |
| Thread-Local | In progress | Marcel | changes must be made. |
| Storage | | Moolenaar | Currently pending |
| | | | platforms are amd64, |
| | | | alpha, ia64, i386, |
| | | | sparc64, and powerpc. |
|-----------------+-------------+----------------+-----------------------|
| | | | FAST_IPSEC currently |
| | | | cannot be used |
| | | | directly with the |
| | | | KAME IPv6 |
| | | | implementation, |
| | | | requiring an |
| | | | additional level of |
| | | | IP tunnel indirection |
| | | | to protect IPv6 |
| | | | packets when using |
| FAST_IPSEC and | | | hardware crypto |
| KAME | Not done | -- | acceleration. This |
| compatibility | | | issue must be |
| | | | resolved so that the |
| | | | two services may more |
| | | | easily be used |
| | | | together. Among other |
| | | | things, this will |
| | | | require a careful |
| | | | review of the |
| | | | handling of mbuf |
| | | | header copying and |
| | | | m_tag support in the |
| | | | KAME IPv6 code. |
|-----------------+-------------+----------------+-----------------------|
| | | | A process cannot be |
| | | | interrupted while |
| | | | waiting on a lock. |
| rpc.lockd(8) | | | Fixing this requires |
| stability | -- | -- | that the RPC code be |
| | | | taught how to deal |
| | | | with lock |
| | | | cancellation and |
| | | | interruption events. |
|-----------------+-------------+----------------+-----------------------|
| | | | Kernel modules are |
| | | | currently built |
| | | | independently from a |
| | | | kernel configuration, |
| | | | and independently |
| | | | from one another, |
| | | | resulting in |
| | | | substantially |
| | | | redundant compilation |
| | | | of objects, as well |
| | | | as the inability to |
| | | | easily manage |
| | | | compile-time options |
| | | | for kernel objects |
| Revised kld | | | (such as MAC, PAE, |
| build | Not done | Peter Wemm | etc) that may require |
| infrastructure | | | conditional |
| | | | compilation in the |
| | | | kernel modules. In |
| | | | order to improve |
| | | | build performance and |
| | | | better support |
| | | | options of this sort, |
| | | | the KLD build |
| | | | infrastructure needs |
| | | | to be revamped. Peter |
| | | | Wemm has done some |
| | | | initial prototyping, |
| | | | and should be |
| | | | contacted before |
| | | | starting on this |
| | | | work. |
|-----------------+-------------+----------------+-----------------------|
| | | | Apple's Darwin |
| | | | operating system has |
| | | | fairly extensive |
| Merge of Darwin | | | improvements to |
| msdosfs, other | Not done | -- | msdosfs and other |
| fixes | | | kernel services; |
| | | | these fixes must be |
| | | | reviewed and merged |
| | | | to the FreeBSD tree. |
|-----------------+-------------+----------------+-----------------------|
| | | | Truss appears to |
| | | | contain a race |
| | | | condition during the |
| | | | start-up of |
| | | | debugging, which can |
| | | | result in truss |
| | | | failing to attach to |
| | | | the process before it |
| | | | exits. The symptom is |
| | | | that truss reports |
| | | | that it cannot open |
| | | | the procfs node |
| | | | supporting the |
| | | | process being |
| | | | debugged. A bug also |
| Race conditions | Errata | | appears to exist |
| in truss | candidate | Robert Drehmel | where in truss will |
| | | | hang if execve() |
| | | | returns ENOENT. A |
| | | | further race appears |
| | | | to exist in which |
| | | | truss will return |
| | | | "PIOCWAIT: |
| | | | Input/output error" |
| | | | occasionally on |
| | | | startup. The fix for |
| | | | this sufficiently |
| | | | changes process |
| | | | execution handling |
| | | | that we will defer |
| | | | the fix to post-5.0 |
| | | | and consider this |
| | | | errata. |
|-----------------+-------------+----------------+-----------------------|
| | | | Many systems |
| | | | supporting POSIX.1e |
| | | | ACLs permit a minor |
| | | | violation to that |
| | | | specification, in |
| | | | which the ACL_MASK |
| ACL_MASK | | | entry overrides the |
| override of | Not done | Robert Watson | umask, rather than |
| umask support | | | being intersected |
| in UFS | | | with it. The |
| | | | resulting semantics |
| | | | can be useful in |
| | | | group-oriented |
| | | | environments, and as |
| | | | such would be very |
| | | | helpful on FreeBSD. |
|-----------------+-------------+----------------+-----------------------|
| | | | The LOR reported in |
| | | | PR kern/55175 needs |
| filedesc LOR | Not done | -- | to be fixed. Filedesc |
| | | | locking needs to be |
| | | | heavily reviewed in |
| | | | general. |
|-----------------+-------------+----------------+-----------------------|
| | | | Currently, MAC |
| | | | protections are |
| | | | enforced only on |
| | | | locally originated |
| | | | file system |
| | | | operations (VOPs), |
| | | | and not on RPCs |
| | | | generated via the NFS |
| | | | server. Improvements |
| MAC support for | Not done | Robert Watson | in NFS server |
| NFS Server | | | credential handling |
| | | | are required to |
| | | | correct this problem, |
| | | | as well as the |
| | | | introduction of new |
| | | | entry points to |
| | | | properly label NFS |
| | | | credentials and |
| | | | perform enforcement |
| | | | properly. |
|-----------------+-------------+----------------+-----------------------|
| | | | All PCI drivers must |
| | | | use busdma for DMA; |
| busdma in all | | | no use of vtophys() |
| PCI drivers | In progress | -- | will be permitted for |
| | | | any recent device |
| | | | driver. ISA drivers |
| | | | may be exempt. |
|-----------------+-------------+----------------+-----------------------|
| KSE support for | | Marcel | Userland bits |
| alpha | In progress | Moolenaar | implemented, kernel |
| | | | bits not implemented. |
|-----------------+-------------+----------------+-----------------------|
| | | | For kernel API/ABI |
| | | | compatibility |
| | | | reasons, it would be |
| CAM locking | In progress | Scott Long | desirable to have the |
| | | | CAM locking strategy |
| | | | determined and |
| | | | loosely implemented |
| | | | for 5.3. |
+------------------------------------------------------------------------+
Documentation items that must be resolved for 5.3
+------------------------------------------------------------------------+
| Issue | Status | Responsible | Description |
|-------------------+-------------+-------------+------------------------|
| | | | The installation |
| | | | documentation doesn't |
| | | | take into account the |
| i386 Floppy | Not done | -- | new floppy images |
| Installation Docs | | | (with a full kernel |
| | | | split across multiple |
| | | | disks). This should be |
| | | | updated. |
|-------------------+-------------+-------------+------------------------|
| | | | Finish removing |
| | | | mention of individual |
| | | | devices in the |
| Finish hardware | | | hardware notes; |
| notes trimming | In progress | -- | hardware notes |
| | | | listings should refer |
| | | | to device listings in |
| | | | individual manual |
| | | | pages. |
+------------------------------------------------------------------------+
Testing focuses for 5.3-RELEASE
+------------------------------------------------------------------------+
| Issue | Status | Responsible | Description |
|-----------------+---------------+---------------+----------------------|
| | | | SCHED_ULE provides |
| | | | better |
| | | | interactivity, |
| SCHED_ULE as | | | higher performance, |
| the default | Needs testing | Jeff Roberson | and the ability to |
| scheduler | | | support pinning and |
| | | | affinity. Basic HTT |
| | | | scheduling policies |
| | | | should be in place |
| | | | for 5.3 also. |
|-----------------+---------------+---------------+----------------------|
| | | | Attempts to use |
| | | | make(1) with KQueues |
| | | | appears to result in |
| | | | a kernel hang under |
| | | | "heavy load". It |
| | | | would be desirable |
| | | | to fix this both |
| | | | from the perspective |
| | | | of building FreeBSD |
| make | | | quickly as a |
| -DUSE_KQUEUE | | Brian | developer, but also |
| causes lockup | Needs testing | Feldman, | because it's an |
| with buildworld | | John-Mark | instability that |
| -jBIGNUM | | Gurney | could show up under |
| | | | other high load and |
| | | | heavy use of |
| | | | KQueues. See PR |
| | | | kern/57945 for a |
| | | | proposed patch and |
| | | | details. This appear |
| | | | to be the product of |
| | | | a locking problem, |
| | | | and must be fixed |
| | | | for 5.3. |
|-----------------+---------------+---------------+----------------------|
| | | | KSE has matured to |
| | | | the point of being |
| | | | more stable and |
| | | | POSIX-compliant than |
| | | | the traditional |
| | | | libc_r. All Tier-1 |
| | | | platforms MUST have |
| KSE as the | | David Xu, | stable KSE support |
| default threads | Needs testing | Daniel | for 5.3 in order to |
| library | | Eischen | support a consistent |
| | | | transition. |
| | | | Additionally, all |
| | | | ports that depend on |
| | | | the pthreads API |
| | | | must be modified to |
| | | | properly detect and |
| | | | support the default |
| | | | threading library. |
|-----------------+---------------+---------------+----------------------|
| | | | Binutils needs |
| Updated | | | updating in order to |
| binutils for | Needs testing | David O'Brien | support new |
| all platforms | | | platforms, newer GDB |
| | | | versions, and Thread |
| | | | Local Storage. |
+------------------------------------------------------------------------+
----------------------------------------------------------------------
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Last modified: 2004/07/15 13:26:38
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