One more instance of if_input being called outside of
interrupt, by means of msk_handle_events.
Differential Revision: https://reviews.freebsd.org/D23379
The PR reported a crash that occurred when a file was removed while
client(s) were actively doing lock operations on it.
Since nfsvno_getvp() will return NULL when the file does not exist,
the bug was obvious and easy to fix via this patch. It is a little
surprising that this wasn't found sooner, but I guess the above
case rarely occurs.
Tested by: iron.udjin@gmail.com
PR: 242768
Reported by: iron.udjin@gmail.com
MFC after: 2 weeks
These should not be any functional change. While the change in
emul10kx-pcm.c looks like a real bug fix (as opposed to inconsistent
whitespace), the extra statements were not harmful.
Reviewed by: kib
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D23363
Originally, hack.c was compiled into a shard object with just -shared
-nostdlib. This assumed that ${CC} did not require any additional
flags for ABIs, cross-building, etc.
When kern.post.mk was created in r89509 by reducing duplication in
kernel Makefile.<arch> files, the -shared flag was moved into a
HACK_EXTRA_FLAGS variable so that sparc64 could override it with
-Wl,-shared. The sparc64 hack was removed in r111650, but
HACK_EXTRA_FLAGS was left in place. Over time, we have started
support toolchains that require flags to support alternate ABIs on
MIPS and PowerPC and started (ab)using HACK_EXTRA_FLAGS to set only
those flags.
I need to fix risc-v to pass -mno-relax to the hack.c build for lld in
llvm 10, and the patches to support cross-build from non-FreeBSD hosts
need to include -target for clang in CFLAGS for hack.c. Rather than
adding more hacks into HACK_EXTRA_FLAGS, just use the full set of
CFLAGS with hack.c.
Reviewed by: kib, arichardson
MFC after: 1 month
Sponsored by: DARPA
Differential Revision: https://reviews.freebsd.org/D23362
Calls to vop_bypass pass the same argument, but type casted to something else.
Thus by replacing NULL routines with vop_bypass we avoid a runtime check.
Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D23357
vdbatch_process leaves the critical section too early, openign a time
window where another thread can get scheduled and modify vd->freevnodes.
Once it the preempted thread gets back it overrides the value with 0.
Just move critical_exit to the end of the function.
This mostly eliminates the requirement that vput never unlocks the vnode
before calling VOP_INACTIVE. Note it may still be present for other
filesystems.
See r356126 for an example bug.
Note vput stopped doing early unlock in r357070 thus this change does
not affect correctness as it is.
Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D23215
and not only for the DCTCP congestion control.
Submitted by: Richard Scheffenegger
Reviewed by: rgrimes, tuexen@, Cheng Cui
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D23119
recovery. This is required by RFC 3168.
Submitted by: Richard Scheffenegger
Reviewed by: rgrimes@, tuexen@, Cheng Cui
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D23118
indicates that ECN should be negotiated for the client side.
Submitted by: Richard Scheffenegger
Reviewed by: rgrimes@, tuexen@
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D23228
The existing AF_UNIX socket garbage collector destroys any socket
which may potentially be in a cycle, as indicated by its file reference
count being equal to its enqueue count. However, this can produce false
positives for in-flight sockets which aren't part of a cycle but are
part of one or more SCM_RIGHTS mssages and which have been closed
on the sending side. If the garbage collector happens to run at
exactly the wrong time, destruction of these sockets will render them
unusable on the receiving side, such that no previously-written data
may be read.
This change rewrites the garbage collector to precisely detect cycles:
1. The existing check of msgcount==f_count is still used to determine
whether the socket is potentially in a cycle.
2. The socket is now placed on a local "dead list", which is used to
reduce iteration time (and therefore contention on the global
unp_link_rwlock).
3. The first pass through the dead list removes each potentially-dead
socket's outgoing references from the graph of potentially-dead
sockets, using a gc-specific copy of the original reference count.
4. The second series of passes through the dead list removes from the
list any socket whose remaining gc refcount is non-zero, as this
indicates the socket is actually accessible outside of any possible
cycle. Iteration is repeated until no further sockets are removed
from the dead list.
5. Sockets remaining in the dead list are destroyed as before.
PR: 227285
Submitted by: jan.kokemueller@gmail.com (prior version)
Reviewed by: markj
Differential Revision: https://reviews.freebsd.org/D23142
This allows the data sender to increase the CWND faster.
Submitted by: Richard Scheffenegger
Reviewed by: rgrimes@, tuexen@, Cheng Cui
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D22670
including user data in the SYN-ACK. When DSACK support was added in
r347382, an immediate ACK was sent even for the received SYN with
user data. This patch fixes that and allows again to send user data with
the SYN-ACK.
Reported by: Jeremy Harris
Reviewed by: Richard Scheffenegger, rrs@
MFC after: 1 week
Sponsored by: Netflix, Inc.
Differential Revision: https://reviews.freebsd.org/D23212
In libalias, a new flag PKT_ALIAS_UNREGISTERED_RFC6598 is added.
This is like PKT_ALIAS_UNREGISTERED_ONLY, but also is RFC 6598 aware.
Also, we add a new NAT option to ipfw called unreg_cgn, which is like
unreg_only, but also is RFC 6598-aware. The reason for the new
flags/options is to avoid breaking existing networks, especially those
which rely on RFC 6598 as an external address.
Submitted by: Neel Chauhan <neel AT neelc DOT org>
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D22877
Both vm_object_scan_all_shadowed() and vm_object_collapse_scan() might
observe an invalid page left in the default backing object by the
fault handler that retried. Check for the condition and refuse to collapse.
Reported and tested by: pho
Reviewed by: jeff
Sponsored by: The FreeBSD Foundation
Differential revision: https://reviews.freebsd.org/D23331
o Make the pci_host_generic_acpi_attach() globally visible.
o Declare a new driver class.
These will be used by a new PCI root complex driver.
Sponsored by: DARPA, AFRL
This unbreaks Mono (mono-devel-4.6.2.7+dfsg-1ubuntu1 from Ubuntu Bionic);
previously would crash on "amd64_is_imm32" assert.
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D23306
an inline function vm_map_lookup_clip_start that invokes them both and
use it in places that invoke both. Drop a couple of local variables
made unnecessary by this function.
Reviewed by: markj
Tested by: pho
Differential Revision: https://reviews.freebsd.org/D22987
There is nothing to do but to bump the count even during said transition.
There are 2 places which can do it:
- vget only does this after locking the vnode, meaning there is no change in
contract versus inactive or reclamantion
- vref only ever did it with the interlock held which did not protect against
either (that is, it would always succeed)
VCHR vnodes retain special casing due to the need to maintain dev use count.
Reviewed by: jeff, kib
Tested by: pho (previous version)
Differential Revision: https://reviews.freebsd.org/D23185
vget is almost always called with LK_SHARED, meaning the flag (if present) is
almost guaranteed to get cleared. Stop handling it in the first place and
instead let the thread which wanted to do inactive handle the bumepd usecount.
Reviewed by: jeff
Tested by: pho
Differential Revision: https://reviews.freebsd.org/D23184
Doing so runs into races with filesystems which make half-constructed vnodes
visible to other users, while depending on the chain vput -> vinactive ->
vrecycle to be executed without dropping the vnode lock.
Impediments for making this work got cleared up (notably vop_unlock_post now
does not do anything and lockmgr stops touching the lock after the final
write). Stacked filesystems keep vhold/vdrop across unlock, which arguably can
now be eliminated.
Reviewed by: jeff
Differential Revision: https://reviews.freebsd.org/D23344
This evens it up with other locking primitives.
Note lock profiling still touches the lock, which again is in line with the
rest.
Reviewed by: jeff
Differential Revision: https://reviews.freebsd.org/D23343
DRIVER_MODULE does not actually define a MODULE_VERSION, which is required
to satisfy a MODULE_DEPENDency. Declare one explicitly in
hwpstate_intel(4).
Reported by: flo
X-MFC-With: r357002
If we have a 'set skip on <ifgroup>' rule this flag it set on the group
kif, but must also be set on all members. pfctl does this when the rules
are set, but if groups are added afterwards we must also apply the flags
to the new member. If not, new group members will not be skipped until
the rules are reloaded.
Reported by: dvl@
Reviewed by: glebius@
Differential Revision: https://reviews.freebsd.org/D23254
Instead of waiting for pc_curthread which is overwritten by
init_secondary_tail(), wait for non-NULL pc_curpcb, to be set by the
first context switch.
Assert that pc_curpcb is not set too early.
Reported and tested by: rlibby
Reviewed by: markj, rlibby
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D23330
ng_nat implements NAT for IPv4 traffic only. When connected to an
ng_ether node it erroneously handled IPv6 packets as well.
This change is not sufficient: ng_nat does not do any validation of IP
packets in this mode, even though they have not yet passed through
ip_input().
PR: 243096
Reported by: Robert James Hernandez <rob@sarcasticadmin.com>
Reviewed by: julian
Differential Revision: https://reviews.freebsd.org/D23080
A submap can only be created from an entry spanning the entire request
range. In particular, if vm_map_lookup_entry() returns false or the
returned entry contains "end".
Since the only use of submaps in FreeBSD is for the static pipe and
execve argument KVA maps, this has no functional effect.
Github PR: https://github.com/freebsd/freebsd/pull/420
Submitted by: Wuyang Chung <wuyang.chung1@gmail.com> (original)
Reviewed by: dougm, kib
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D23299
After r355784 we no longer hold a thread's thread lock when switching it
out. Preserve the previous synchronization protocol for td_oncpu by
setting it together with td_state, before dropping the thread lock
during a switch.
Reported and tested by: pho
Reviewed by: kib
Discussed with: jeff
Differential Revision: https://reviews.freebsd.org/D23270
Doing so can cause deadlocks or panics during boot, if an interrupt
handler accesses uninitialized per-CPU scheduler structures. This seems
to occur frequently when running under QEMU or AWS. The idle threads
are set up to release a spinlock section and enable interrupts in
fork_exit(), so there is no need to enable interrupts earlier.
Reviewed by: kib
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D23328
