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Grzegorz Junka
16a284b1cd
Since80c7315d17("Restore signal mask in epoll_pwait.") the caller's signal mask is saved in a local variable, but TDP_OLDMASK is still set and the TDA_SIGSUSPEND AST is still scheduled. On return to user mode that AST, or postsig() if a signal is delivered, then installs td_oldsigmask, which this code never writes and which holds whatever mask the thread had at its last sigsuspend(2), pselect(2) or ppoll(2). As a result every epoll_pwait(2)/epoll_pwait2(2) call with a non-NULL sigmask can leave the thread with a stale signal mask. In addition, the explicit restore at the end overwrote the return value, so EINTR (and any other error) was reported to user space as 0. Save the old mask in td_oldsigmask and let the AST restore it, as kern_pselect() and kern_poll_kfds() do: schedule TDA_SIGSUSPEND if the wait was interrupted, so the signal is delivered with the temporary mask in place, and TDA_PSELECT otherwise. This matches Linux, which restores the saved mask unless the syscall returns -EINTR. This deadlocks Bun-based programs such as Claude Code (>= 2.1.269) and opencode. JavaScriptCore suspends threads for conservative GC stack scanning by sending SIGPWR and waiting for the target's handler, which calls sigsuspend(2) with SIGPWR blocked. Afterwards td_oldsigmask contains SIGPWR, the event loop's next epoll_pwait2(2) (Bun always passes an empty sigmask) blocks SIGPWR on the main thread, and the next GC suspend request waits forever. PR: 298878 Fixes:80c7315d17("Restore signal mask in epoll_pwait.") MFC after: 1 week
FreeBSD Kernel Source:
This directory contains the source files and build glue that make up the FreeBSD kernel and its modules, including both original and contributed software.
Kernel configuration files are located in the conf/ subdirectory of each
architecture. GENERIC is the configuration used in release builds. NOTES
contains documentation of all possible entries. LINT is a compile-only
configuration used to maximize build coverage and detect regressions.
Documentation:
Source code documentation is maintained in a set of man pages, under section 9.
These pages are located in share/man/man9, from the
top-level of the src tree. Consult intro(9)
for an overview of existing pages.
Some additional high-level documentation of the kernel is maintained in the Architecture Handbook.
Source Roadmap:
| Directory | Description |
|---|---|
| amd64 | AMD64 (64-bit x86) architecture support |
| arm | 32-bit ARM architecture support |
| arm64 | 64-bit ARM (AArch64) architecture support |
| bsm | Basic Security Module headers - audit(4) and bsm(3) |
| cam | Common Access Method storage subsystem - cam(4) and ctl(4) |
| cddl | CDDL-licensed optional sources such as DTrace |
| compat | Linux compatibility layer, FreeBSD 32-bit compatibility |
| conf | kernel build glue |
| contrib | 3rd-party imported software such as OpenZFS |
| crypto | crypto drivers |
| ddb | interactive kernel debugger - ddb(4) |
| dev | device drivers and other arch independent code |
| dts | FreeBSD-specific device tree sources |
| fs | most filesystems, excluding UFS, NFS, and ZFS |
| gdb | kernel remote GDB stub - gdb(4) |
| geom | GEOM framework - geom(4) |
| gnu | GPL-licensed sources |
| i386 | i386 (32-bit x86) architecture support |
| isa | PC ISA bus implementation |
| kern | main part of the kernel |
| kgssapi | kernel-space GSSAPI implementation |
| libkern | libc-like and other support functions for kernel use |
| modules | kernel module infrastructure |
| net | core networking code |
| net80211 | wireless networking (IEEE 802.11) - net80211(4) |
| netgraph | graph-based networking subsystem - netgraph(4) |
| netinet | IPv4 protocol implementation - inet(4) |
| netinet6 | IPv6 protocol implementation - inet6(4) |
| netipsec | IPsec protocol implementation - ipsec(4) |
| netlink | kernel network configuration protocol - netlink(4) |
| netpfil | packet filters - ipfw(4), pf(4), and ipfilter(4) |
| netsmb | Server Message Block protocol implementation |
| nfs | common code and headers for Network File System |
| nfsclient | NFS client implementation for mounting and stats |
| nfsserver | NFS server implementation for exporting local filesystems to network |
| nlm | Network Lock Management protocol implementation |
| ofed | OpenFabrics Enterprise Distribution implementation |
| opencrypto | OpenCrypto framework - crypto(7) |
| powerpc | PowerPC/POWER (32 and 64-bit) architecture support |
| riscv | 64-bit RISC-V architecture support |
| rpc | Open Network Computing Remote Procedure Call implementation - rpc(3) |
| security | security facilities - audit(4) and mac(4) |
| sys | kernel headers |
| teken | terminal emulation interface implementation - teken(3) |
| tests | kernel unit tests |
| tools | kernel build scripts and utilities |
| ufs | Unix File System - ffs(4) |
| vm | virtual memory system |
| x86 | code shared by AMD64 and i386 architectures |
| xdr | External Data Representation implementation - xdr(3) |
| xen | Xen hypervisor support - xen(4) |