Konstantin Belousov

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[Konstantin Belousov @kostikbel2]

@zoneminder Unlocking in non-owning thread is UB.

[Konstantin Belousov @kostikbel2]

@freebsdfndation

[Konstantin Belousov @kostikbel2]

@disruptnhandlr cmovcc of course

[Konstantin Belousov @kostikbel2]

@disruptnhandlr Do movcc to unmapped address, for instance. AFAIR traps in the transactional region are suppressed, but transactions are aborted.

[Konstantin Belousov @kostikbel2]

@cperciva @kaevans91 @markjdb2 @FrameworkPuter Ah right it is cninit() to bring up console early, for boot -d.

[Konstantin Belousov @kostikbel2]

@kaevans91 @markjdb2 @cperciva @FrameworkPuter It is very strange, kbd controller should not be touched that early.

[Konstantin Belousov @kostikbel2]

@kaevans91 @cperciva @FrameworkPuter How much memory do you have? If a lot, it is most likely vm_page_array[] initialization.

[Konstantin Belousov @kostikbel2]

@DarkainMX @freebsd Well, you can run even 1.0 binaries on amd64. And you do not need a jail for that, in fact.

[Konstantin Belousov @kostikbel2]

@awesomekling ARMv8 8.7 List of LD* instructions goes from C6.2.98 to C6.2.177. Then ST* are in C6.2.248 to C6.2.311. Total 144.

[Konstantin Belousov @kostikbel2]

Esp. if you start counting from the first change (~10 years ago) when trampolines were moved from stack to dedicated shared pages (to allow stacks be nx).

[Konstantin Belousov @kostikbel2]

Signal trampolines on FreeBSD/amd64 (both 64bit and 32bit) are now proper shared libs. This is one of the most complicated NOPs I ever implemented.

[Konstantin Belousov @kostikbel2]

@klarainc @vermaden # cc -v
gcc version 2.7.2.1

[Konstantin Belousov @kostikbel2]

@__phantomderp @bgianf Each return from kernel mode to userspace checks for pending signals and deliver them. Not only runtime calls, but also returns from hw interrupts (think timers). Look for e.g. setitimer(2) to get periodic nudge.

[Konstantin Belousov @kostikbel2]

@bsdimp Can we have this as devfs aliases, e.g. symlinks under /dev/UEFI/ ?

[Konstantin Belousov @kostikbel2]

@ed_maste only SIGKILL, ^C wouldn't work

[Konstantin Belousov @kostikbel2]

@joshbloch Is it something about class init procedure? The class of the lambda is inner, so it waits for init lock of Oddity, while rules allow it continue if lambda class is nestingly inited in the same thread that Oddity.

[Konstantin Belousov @kostikbel2]

I was pleasantly surprised that this took less than a week from user report to actual fix https://t.co/7EqIurSlJB

[Konstantin Belousov @kostikbel2]

https://t.co/PCd3vhBbqW remote TLB shootdown

[Konstantin Belousov @kostikbel2]

@MOS_8502 0f 45 ... is cmovne, which is pentiumpro and later. K6-2 did not have that instructions. FreeBSD 13 (actually clang) compiles i386 code for ppro.

[Konstantin Belousov @kostikbel2]

@MengTangmu @thatcks You are mixing vnode locks and range locks. In fact, on 13, if all pages to be read are resident, UFS does not take vnode lock for read at all (so not affected by e.g. fsync). But range lock is taken to guarantee atomicity.