• Email: markj@FreeBSD.org

Here are some lists of things.

These are things that I would like to eventually get done/fix. Please mail me if you'd like to work on them.

Merge fdescfs into devfs.

• needed for fexecve()+shebang
• expected by lots of third-party software
• default in other unix-like kernels
• considerations:
  • needs to appear in jails by default as well
  • need to sort out Capsicum integration

Early microcode loading on AMD

• lacking a convenient test system

TRIM for swap devices

• interrogate swap GEOM for candelete capability
• dispatch TRIMs asynchronously from swp_pager_freeswapspace()
• Doug is working on this in Review: D20863

IPv6 netdump(4)

• need to use Neighbour Discovery to find the first-hop router

Kernel dump regression testing

• doable with bhyve and expect after r346550

lockmgr(9), rmlock(9) and epoch(9) integration into lockstat

• lockmgr is mostly done now

sendmail hangs on boot if the hostname contains a single component

Better VM statistics

• Per-domain stats in vmstat -s output
• Add counters for the various branches in page daemon scanning (e.g., how many times did we skip a busy page?)
• Measure internal fragmentation in UMA zones
• Page table and PV chunk memory usage

syzbot reports

• https://syzkaller.appspot.com/freebsd (See also: KernelFuzzing Syzkaller)

Capsicumizing the base system

stress2 as a service

• False-positive WITNESS warnings. These confuse automation and new users alike.
  • Partial progress using the blessing table, but we need a more precise method (e.g., add a lock-specific NOWITNESS flag argument to lock operations).
• stack_chk_init: WARNING: Initializing stack protection with non-random cookies!
  • I don't know whether this is important or how to fix it.
• WARNING: attempt to domain_add(%s) after domainfinalize()
  • Printed when bluetooth modules are auto-loaded during boot.

Set a Kyua configuration variable from the command line:

• kyua -v test_suites.FreeBSD.allow_sysctl_side_effects=1 test

Resetting an arm64 CPU during early boot:

ldr x0, =(0x84000009)
smc #0

• Need to check the method for the PSCI device in the FDT, it should be “smc”

drivers printing stuff during probe:

WARNING: Device "kbd" is Giant locked and may be deleted before FreeBSD 14.0.
000.000049 [4350] netmap_init               netmap: loaded module
[ath_hal] loaded
mlx5en: Mellanox Ethernet driver 3.6.0 (December 2020)
nexus0
KTLS: Initialized 12 threads

Unactionable errors:

WARNING: Device "kbd" is Giant locked and may be deleted before FreeBSD 14.0.
unknown: memory range not supported

Printing lines per CPU:

hwpstate_intel0: <Intel Speed Shift> on cpu0
hwpstate_intel1: <Intel Speed Shift> on cpu1
hwpstate_intel2: <Intel Speed Shift> on cpu2
hwpstate_intel3: <Intel Speed Shift> on cpu3
...

ioat0: <HSW IOAT Ch0> mem 0xee130000-0xee133fff irq 31 at device 4.0 numa-domain 0 on pci2
ioat0: Capabilities: 2f7<PQ,Extended_APIC_ID,Block_Fill,Move_CRC,DCA,Marker_Skipping,CRC,Page_Break>
ioat1: <HSW IOAT Ch1> mem 0xee12c000-0xee12ffff irq 39 at device 4.1 numa-domain 0 on pci2
ioat1: Capabilities: 2f7<PQ,Extended_APIC_ID,Block_Fill,Move_CRC,DCA,Marker_Skipping,CRC,Page_Break>
ioat2: <HSW IOAT Ch2> mem 0xee128000-0xee12bfff irq 31 at device 4.2 numa-domain 0 on pci2
ioat2: Capabilities: f7<Extended_APIC_ID,Block_Fill,Move_CRC,DCA,Marker_Skipping,CRC,Page_Break>
...