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wire 2026-07-01
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KERNEL PROBES GET EMERGENCY FIXES AFTER NULL POINTER CRASHES

By RepoJournal · Filed · About Linux · Composed from the cited sources · methodology

The Linux kernel's dynamic tracing subsystem shipped critical fixes overnight to prevent general protection faults and crashes in fprobe handlers under concurrent registration.

A major NULL pointer dereference in fprobe_fgraph_entry() has been patched [1] [2]. The bug occurred when new fprobes registered on live instrumentation points became visible mid-operation, causing the shadow-stack fill walk to process exit handlers that the sizing walk never counted, writing past reserved bounds. This is not a theoretical race condition - it crashes production systems running concurrent kprobe registration. The kernel team also removed a WARN_ON_ONCE that users could trigger trivially [3], fixing developer experience when adding kprobe events with BTF parameters at raw addresses. In related fixes, the tracing subsystem now enforces mandatory $ prefix for comm access [4] to prevent ambiguity with event fields, and corrected a double-offset calculation bug in field dereference parsing [5] that corrupted memory access patterns. All five changes land in the probe fixes batch for v7.2-rc1.

Action items

References

  1. [1] Merge tag 'probes-fixes-v7.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace torvalds/linux ↗
  2. [2] tracing/fprobe: Fix NULL pointer dereference in fprobe_fgraph_entry() torvalds/linux ↗
  3. [3] tracing/probes: Remove WARN_ON_ONCE from parse_btf_arg torvalds/linux ↗
  4. [4] tracing/probes: Make the $ prefix mandatory for comm access torvalds/linux ↗
  5. [5] tracing/probes: Fix double addition of offset for @+FOFFSET torvalds/linux ↗

$ ls linux/reviews/ # the step-back reads

the week in review Omarchy polkit PAM stack skipped system-auth the month in review Linux 7.3 rc cycle fixes cgroup kill, SMB corruption
Full archive → Weekly reviews →

Quick answers

What shipped in Linux on July 1, 2026?
The Linux kernel's dynamic tracing subsystem shipped critical fixes overnight to prevent general protection faults and crashes in fprobe handlers under concurrent registration. In total, 7 commits landed.
What were the notable Linux updates?
Merge tag 'probes-fixes-v7.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace, tracing/fprobe: Fix NULL pointer dereference in fprobe_fgraph_entry(), and tracing/probes: Remove WARN_ON_ONCE from parse_btf_arg.
♥

$ log Linux --recent

drm-fixes backs out dma-buf debug, vfs closes pathwalk use-after-frees 29 shipped Netlink stops hashing the net pointer, stmmac clears a stuck RGMII interrupt 27 shipped Poly1305 carry fix lands, Omarchy locks down N1x laptops and idle fingerprint readers 23 shipped Omarchy copies agent logins over SSH, kernel queues 7.4 merges 106 shipped

$ log --all # elsewhere on the wire

Alignment & Post-training verl rejects conflicting vLLM engine_kwargs, open-instruct adds MILES OPD behind a Megatron learner Interpretability nnsight 0.8.0 cuts import time from 7.6s to 1.6s

$ ls showcases/

Safety Evals AI Red Teaming Agent Security Interpretability Alignment & Post-training

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