On 25/12/21 12:23, FreeBSD User wrote:
Am Fri, 24 Dec 2021 08:51:39 GMT
schrieb Doug Moore <do...@freebsd.org>:
The branch main has been updated by dougm:
URL:
https://cgit.FreeBSD.org/src/commit/?id=184c63db3c949d8ba766dc7b2bd2f082404e169d
commit 184c63db3c949d8ba766dc7b2bd2f082404e169d
Author: Doug Moore <do...@freebsd.org>
AuthorDate: 2021-12-24 08:47:21 +0000
Commit: Doug Moore <do...@freebsd.org>
CommitDate: 2021-12-24 08:47:21 +0000
Fix clerical error in page alloc
Fix a very recent change that introduced a page accounting error
in case of a reserveration being broken.
Reviewed by: alc
Fixes: fb38b29b5609 (page_alloc_br) vm_page: Remove extra test,
dup code from page alloc Differential Revision:
https://reviews.freebsd.org/D33645 ---
sys/vm/vm_page.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/sys/vm/vm_page.c b/sys/vm/vm_page.c
index c24da96f4312..03351b0ad3dd 100644
--- a/sys/vm/vm_page.c
+++ b/sys/vm/vm_page.c
@@ -2186,11 +2186,11 @@ vm_page_find_contig_domain(int domain, int
req, u_long npages, vm_paddr_t low, vm_page_t m_ret;
vmd = VM_DOMAIN(domain);
- if (!vm_domain_allocate(vmd, req, npages))
- return (NULL);
#if VM_NRESERVLEVEL > 0
again:
#endif
+ if (!vm_domain_allocate(vmd, req, npages))
+ return (NULL);
/*
* Try to allocate the pages from the free page queues.
*/
It seems that our hosts running with this patch are "dead" after a
while while under load (poudriere): ssh on both IPv4 and IPv6 are dead
as well as http/https on IPv4/IPv6 (remote site, no connection via ssh
anymore, but hosts respond to ping, nmap show several other services on
local network as reachable, but no ssh(22)/apache24(http/https).
Other hosts at OS level before this patch seem to be allright so far
(i.e. FreeBSD 14.0-CURRENT #39 main-n251899-fa255ab1b895: Thu Dec 23
13:48:41 CET 2021 amd64).
I have to admit its a wild guess that this patch is the culprit, but it
is strange that two out of four hosts with this patch applied are now
both unreachable on both ssh and http (lates www/apache24) while two
other hosts stuck with the version showed above seem to operate on
ssh/http.
Can investigate earliest after 26th of December.
I'm also seeing a strange behaviour related to memory and the VM
subsystem with recent (24th December) head . It was not happening with
head from mid November.
I'm seeing strange issues with virtualbox on recent head too. It fails
to launch VMs or VMs pause due to memory exhaustion, while the machine
has lots of free memory. Maybe the real issue is memory fragmentation
though.
I'm now testing updating to newer head including commit
0d5fac287294490ac488d74e598e019334610bdb (vm: alloc pages from reserv
before breaking it) which is definitely related and maybe fix this.
Anyway there is definitely something going on with recent changes to VM
subsystem that requires investigation.
I can reproduce this easily, just install virtualbox-ose, create a VM
with a non tiny memory footprint and run it, or run more than one. It is
easier to reproduce if some other software is already running on the
machine (this is why I suspect some memory fragmentation issue).
--
Guido Falsi <madpi...@freebsd.org>
