RaiseOn suspends the target, reads its context and, while it is in host
code, resumes it and samples again after SwitchToThread. On a 16-core
Ryzen 9 5950X (Windows 11 22H2) that resampled the writer of
guest_raise_in_host_code about every 10 us before it could run: in the
raise that hung, 4,989 samples over 50 ms all found it in ucrtbase, so
the 50 ms host-code limit ran out and the handler was redirected into
fwrite, where it deadlocked on the stream lock (the test timed out at
30 s on every run). In a passing raise the samples sat at one RIP for
14,695 of 14,703 samples and the raise took 145 ms.
Spin for 20 us before each new host-code sample, so the target gets to
leave host code. With that, guest_raise_in_host_code passes 5 of 5 runs,
no raise is redirected in host code, and the longest raise is 0.46 to
0.53 ms. Other samples keep SwitchToThread.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
getpeername on a socketpair end returned the unnamed AF_UNIX address
even after the other end was closed. In FreeBSD 11, closing an end runs
uipc_detach, whose unp_disconnect and unp_drop clear SS_ISCONNECTED on
both stream and datagram ends, and kern_getpeername then fails with
ENOTCONN. Each end now keeps a weak reference to its peer's socket,
which expires when the peer's last descriptor, duplicates included, is
closed. shutdown leaves the ends connected, as soshutdown does.
FreeBSD 11.4's lookup() (sys/kern/vfs_lookup.c) fails with ENOTDIR when
a path with a trailing slash ends at something that is not a directory.
On Windows a mount alias dropped the slash, and the host calls do not
report ENOTDIR for "file\", so unlink, rename and open acted on the file
or failed with EINVAL. Guest path resolution now rejects an existing
non-directory named with a trailing slash with ENOTDIR on every host, and
a mount alias keeps the slash on Windows as it does on Linux and macOS.
FreeBSD keeps every character device on devfs, whose devfs_statfs reports
512-byte blocks, 2 blocks and nothing free. Windows threw for any console,
NUL or the guest random device, and Linux described the host's /dev mount.
A kqueue now returns EINVAL, as getvnode does.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Measured on firmware 13.60: the released range stays mapped with its
protection and contents, and a fixed no-overwrite map over it fails
with ENOMEM; a null or unaligned address, an unaligned length or a
range that wraps returns EINVAL, checked before a zero length, which
returns 0, as does a range with nothing mapped.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
Measured on firmware 13.60: the first poll or wait that reports a
finished request returns its plain state and later ones add bit
0x10000, while cancel returns the plain state and does not count as a
read; a request that fails completes with state 3 and the error in its
result, and the other requests of its batch still run.
Co-Authored-By: Claude Opus 5.5 <[email protected]>
