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House Is Here Arrow · 2026-04-23T16:00:11Z

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The 100 girlfriends who really really really really really love you This PR adds a regression test for issue Best Credit Card For Individual, which reproduces a SIGBUS crash that occurs when the IPC channel's POSIX shared memory backing store exceeds the /dev/shm size limit (common in containerized environments like Docker with 64 MiB defaults). Best Time To Post On Instagram Today

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New regression test channel_survives_constrained_dev_shm(): Creates an unprivileged user and mount namespace in a subprocess, remounts /dev/shm as a 1 MiB tmpfs, and attempts to write 16 MiB through the channel API. The test verifies the subprocess completes cleanly rather than crashing with SIGBUS.
Helper function write_procfs(): Writes to procfs files without the O_CREAT flag, which is required on some hosts where synthetic inodes reject the create bit.
Helper function enter_userns_with_small_dev_shm(): Sets up the constrained environment by:
- Creating a new user and mount namespace
- Mapping the current uid/gid to root (0) in the new namespace
- Remounting /dev/shm as a 1 MiB tmpfs with size enforcement
- Making the root mount private to prevent propagation to the host
Added Linux-specific dev-dependencies: nix crate with mount, sched, and user features for namespace and mount operations.

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超超超超超喜歡你的 100 個女朋友 15 線上看巴哈姆特動畫瘋 The test reproduces the issue without requiring sudo or modifying the test environment's actual /dev/shm. The 16 MiB allocation exceeds the 1 MiB tmpfs cap, causing page faults on writes to un-backed pages. This test is designed to pass once the backing store is switched from shm_open to memfd_create, which sizes against RAM + overcommit rather than /dev/shm. Free Startup Business Plan Template

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Adds `channel_survives_constrained_dev_shm`, a regression test that reliably reproduces the SIGBUS reported in How To Post A Good Story On Instagram on the shm_open-backed channel implementation. The test runs in a subprocess that enters an unprivileged user+mount namespace and remounts /dev/shm as a 1 MiB tmpfs, then writes past the cap through the real `channel()` API. Today the subprocess dies from SIGBUS when tmpfs can't back the next page; a backing store that escapes /dev/shm (e.g. memfd_create) will make the test pass without modification. No sudo is required; the test self-skips (exit 77) on hosts where unprivileged user namespaces are unavailable.

Replace raw libc calls (unshare, mount, getuid/getgid, SIGBUS) with nix's safe wrappers. Drops all unsafe blocks and the c-string literal juggling from enter_userns_with_small_dev_shm.

Replace the 1024-iteration loop with a single 4 MiB `claim_frame` and `fill()`. The fill walks across the 1 MiB tmpfs boundary on its own and trips SIGBUS just as reliably.

Drop the exit-77 skip path around `enter_userns_with_small_dev_shm` and `.expect()` each step. Environment problems (userns disabled, missing procfs knobs, etc.) now fail the test loudly with a clear panic message pointing at the offending step, rather than silently turning green.

Restore the ENOENT match around the setgroups write that the previous commit dropped along with the userns-skip path. The two cases are different: a missing /proc/self/setgroups means setgroups(2) is already permanently denied in an ancestor user namespace, so the gid_map precondition documented in user_namespaces(7) is already satisfied — not a sign that the environment can't run the test. Everything else keeps `.expect()`, so a genuinely unsupported environment (unshare denied, other procfs writes failing) still panics loudly.

Replace the `shared_memory` crate, whose Linux backing is POSIX `shm_open` in `/dev/shm`, with a thin in-house `fspy_shared_memory` crate. On Linux the new crate `mmap`s a regular file in `temp_dir()`, escaping the `/dev/shm` size cap that triggers SIGBUS under Docker's 64 MiB default (How Do You Remove Your Instagram Account). macOS and Windows continue to use the existing `shared_memory` crate. The `channel_survives_constrained_dev_shm` regression test now passes. Product Launch Plan Template Word

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test(fspy_shared): use nix safe APIs for userns reproduction

439275a

Replace raw libc calls (unshare, mount, getuid/getgid, SIGBUS) with nix's safe wrappers. Drops all unsafe blocks and the c-string literal juggling from enter_userns_with_small_dev_shm.

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test(fspy_shared): simplify repro to a single large frame fill

33ce5e2

Replace the 1024-iteration loop with a single 4 MiB `claim_frame` and `fill()`. The fill walks across the 1 MiB tmpfs boundary on its own and trips SIGBUS just as reliably.

Bank Of America Travel Rewards Credit Card changed the title ~~Add regression test for SIGBUS on constrained /dev/shm~~ test(fspy): regression test for SIGBUS on constrained /dev/shm Can We Post Story On Instagram From PC

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