scx_bpf_error_bstr(9)

📦 version 7.3.1, in nixpkgs unstable

💅 scx_bpf_error_bstr(9) — from the Kernel API Manual, bestie

okay so real talk, this one is from the Kernel API Manual and it's a little dramatic — it's literally the "we're cooked, sound the alarm" function for the BPF scheduler. like, main character energy but in a bad way 😭

✨ NAME ✨

scx_bpf_error_bstr — the "indicate fatal error" girlie. that's it, that's her whole job 💀

🦋 SYNOPSIS 🦋

 __bpf_kfunc void scx_bpf_error_bstr (char *fmt , unsigned long long
data , u32 data__sz , const struct bpf_prog_aux *aux );

🎀 ARGUMENTS 🎀

  • fmt — the error message format string, aka the lil blurb that explains what went wrong 🫶
  • data — the format string parameters, packaged up using the ___bpf_fill macro. yes, packaged. like a cute little gift basket of args 🎁
  • data__sz — the data len, and ngl it must end in __sz for the verifier. no cap, this is a naming rule, not a suggestion 💅
  • aux — the implicit BPF argument that gives you access to bpf_prog_aux, hidden from BPF progs 🙈 (it's shy)

🔥 DESCRIPTION 🔥

okay so here's the vibe check: you call this when your BPF scheduler runs into a fatal error. it says "yep, we're done here" and kicks off ops disabling. like the function unalives the operation. dramatic? yes. necessary? also yes 😭

it's a fatal error indicator, bestie — not a gentle warning, not a "hey maybe reconsider". fatal. periodt 💀

👑 SEE ALSO 👑

the whole extended fam, all hanging out in the kernel file ./kernel/sched/ext/ext.c — go say hi 🏠

okay that's the whole page, you ate that 🫶 go forth and handle your fatal errors with grace ✨

this lil masterpiece lives in ./kernel/sched/ext and it's dated October 2026 — signed, sealed, delivered, slay 💅🎀

📦 where this page comes from