Re: git: 8a62a2a5659d - main - zfs: merge openzfs/zfs@f8e5af53e

On Sat, Mar 21, 2026 at 09:04:17AM +0100, A FreeBSD User wrote:
> Am Tage des Herren Fri, 20 Mar 2026 23:27:20 -0400
> Charlie Li <vishwin@freebsd.org> schrieb:
> 
> > Shawn Webb wrote:
> > > On Tue, Mar 17, 2026 at 04:52:16PM +0000, Shawn Webb wrote:  
> > >> On Tue, Mar 17, 2026 at 10:44:59AM -0600, Warner Losh wrote:  
> > >>> On Tue, Mar 17, 2026 at 10:36 AM Shawn Webb <shawn.webb@hardenedbsd.org>
> > >>> wrote:
> > >>>  
> > >>>> Hey Martin,
> > >>>>
> > >>>> On Sat, Mar 14, 2026 at 01:26:23PM +0000, Martin Matuska wrote:  
> > >>>>> The branch main has been updated by mm:
> > >>>>>
> > >>>>> URL:  
> > >>>> https://cgit.FreeBSD.org/src/commit/?id=8a62a2a5659d1839d8799b4274c04469d7f17c78  
> > >>>>>
> > >>>>> commit 8a62a2a5659d1839d8799b4274c04469d7f17c78
> > >>>>> Merge: f91464171d61 f8e5af53e92f
> > >>>>> Author:     Martin Matuska <mm@FreeBSD.org>
> > >>>>> AuthorDate: 2026-03-14 12:14:56 +0000
> > >>>>> Commit:     Martin Matuska <mm@FreeBSD.org>
> > >>>>> CommitDate: 2026-03-14 12:14:56 +0000
> > >>>>>
> > >>>>> [snip for brevity]
> > >>>>>
> > >>>>>      Obtained from:  OpenZFS
> > >>>>>      OpenZFS commit: f8e5af53e92fa7c03393fbd4922cb9c1d0c15920  
> > >>>>
> > >>>> This commit seems to cause issues when building boot loader related
> > >>>> code:
> > >>>>
> > >>>> ==== BEGIN LOG ====
> > >>>> 114232 bytes available
> > >>>> btxld -v -f aout -e 0x200000 -o loader_simp -l
> > >>>> /usr/obj/usr/src/amd64.amd64/stand/i386/btx/btxldr/btxldr  -b
> > >>>> /usr/obj/usr/src/amd64.amd64/stand/i386/btx/btx/btx loader_simp.bin
> > >>>> kernel: ver=1.02 size=690 load=9000 entry=9010 map=16M pgctl=0:58
> > >>>> client: fmt=elf size=5e2e8 text=57930 data=514c bss=7470 entry=0
> > >>>> output: fmt=aout size=61000 text=1000 data=5f000 org=200000 entry=200000  
> > >>>> ===> stand/i386/pxeldr (all)  
> > >>>> -560 bytes available
> > >>>> *** Error code 1
> > >>>>  
> > >>>
> > >>> What all do you have enabled? The defaults aren't even close to running out
> > >>> of space (though I've not looked at this).  
> > >>
> > >> Hey Warner,
> > >>
> > >> Thanks for reaching out! I've uploaded `make showconfig` here:
> > >> https://hardenedbsd.org/~shawn/2026-03-17_srcconf-r01.txt
> > >>
> > >> The following options are specific to HardenedBSD (in no particular
> > >> order):
> > >>
> > >> 1. MK_HBSD_UPDATE
> > >> 2. MK_HBSDCONTROL
> > >> 3. MK_PIE
> > >> 4. MK_RELRO
> > >> 5. MK_SHLIBRANDOM
> > >> 6. MK_ZERO_REGS
> > >> 7. MK_SPECTREV1_FIX
> > >> 8. MK_SAFESTACK
> > >> 9. MK_RETPOLINE
> > >> 10. MK_LTOLIB
> > >> 11. MK_CFI  
> > > 
> > > MK_RETPOLINE was the culprit. Something about this ZFS commit causes
> > > LLVM to emit more retpoline entries than before--too many for a little
> > > bootloader. That might be something to investigate later, but only to
> > > satisfy a curious mind, not to actuall fix anything (since nothing's
> > > actually broken.)
> > > 
> > > Since it doesn't really make sense to apply speculative execution
> > > mitigations to a bootloader, I disabled retpoline for a components
> > > in stand/.
> > > 
> > > Good to go.
> > >   
> > Also just got bit by this, albeit during the lua loader, since I have 
> > WITH_RETPOLINE in my src.conf.
> > 
> 
> Hello,
> 
> I do not have WITH_RETPOLINE in my /etc/src.conf, but since I got this mysterious error about
> not enough bytes left, I use WITHOUT_LOADER_PXEBOOT= YES (due to issues with WITH_BEARSSL=YES
> also used).
> Despite not using any WITH_RETPOLINE I also catch the error ...

Something about this ZFS commit causes the boot laoder to be too big.
I guess the first sign of trouble was with retpolines, but there seem
to now be additional signs.

What's the process for filing a bug report against OpenzFS for
something like this? (Not asking you directly, just a general question
for the thread.)

Thanks,

-- 
Shawn Webb
Cofounder / Security Engineer
HardenedBSD

Signal Username:  shawn_webb.74
Tor-ified Signal: +1 303-901-1600 / shawn_webb_opsec.50
https://git.hardenedbsd.org/hardenedbsd/pubkeys/-/raw/master/Shawn_Webb/03A4CBEBB82EA5A67D9F3853FF2E67A277F8E1FA.pub.asc