From: Li Feng <fengli@smartx.com>
To: passt-user@passt.top
Subject: Re: qemu couldn't connect the unix domain socket
Date: Fri, 29 Oct 2021 13:27:44 +0800 [thread overview]
Message-ID: <CAHckoCzGHToxtgd_BeJDbD5xmv4-NDbejDPq5atE-Tn2VtRgog@mail.gmail.com> (raw)
In-Reply-To: <CAHckoCzVc9f3pQcOo-pCGH3v8xQ1D2MdYD90CgfXCuAxTkYXzQ@mail.gmail.com>
[-- Attachment #1: Type: text/plain, Size: 4589 bytes --]
Hi Stefano,
I got the coredump file, it reports the `fork` syscall is bad:
Program terminated with signal SIGSYS, Bad system call.
#0 __GI__Fork () at ../sysdeps/nptl/_Fork.c:50
50 return pid;
(gdb) bt
#0 __GI__Fork () at ../sysdeps/nptl/_Fork.c:50
#1 0x00007f8c04fdc02a in __libc_fork () at fork.c:73
#2 0x00007f8c05009f8b in daemon (nochdir=0, noclose=0) at daemon.c:48
#3 0x000000000040c1e9 in main (argc=1, argv=0x7ffd10b5cd78) at passt.c:368
quit)
Looks like the seccomp is still badly configured.
I have little knowledge about the seccomp.
I have tried to add the fork like this, but it doesn't work.
--- a/passt.c
+++ b/passt.c
@@ -278,7 +278,7 @@ static void pid_file(struct ctx *c) {
* #syscalls prlimit64 epoll_ctl epoll_create1 epoll_wait accept4 accept listen
* #syscalls socket bind connect getsockopt setsockopt recvfrom sendto shutdown
* #syscalls openat fstat fcntl lseek clone setsid exit_group getpid
- * #syscalls clock_gettime newfstatat
+ * #syscalls clock_gettime newfstatat fork
* #syscalls:pasta rt_sigreturn
*/
int main(int argc, char **argv)
Thanks,
Feng Li
On Fri, Oct 29, 2021 at 11:33 AM Li Feng <fengli(a)smartx.com> wrote:
>
> Hi Stefano,
>
> The previous test has included the fix.
> This is my repo HEAD:
> * 2c7431f - (HEAD -> master, origin/master, origin/HEAD) README:
> Feature list, links to lists, bugs, chat (6 days ago) <Stefano Brivio>
> * a77c5ef - README, perf_report: Markdown and CSS fixes (7 days ago)
> <Stefano Brivio>
> * 94c7c1d - slirp4netns.sh: Fix up usage, exit 0 on --help (7 days
> ago) <Stefano Brivio>
> * 1fc6416 - seccomp: Add newfstatat to list of allowed syscalls (7
> days ago) <Stefano Brivio>
> * d36e429 - netlink: Fix length of address attribute (7 days ago)
> <Stefano Brivio>
>
> My OS is Fedora 35, x64 version.
> I will try to dig it when I have some time.
>
> Thanks,
> Feng Li
>
> On Thu, Oct 28, 2021 at 3:30 PM Stefano Brivio <sbrivio(a)redhat.com> wrote:
> >
> > Hi Feng Li,
> >
> > On Thu, 28 Oct 2021 12:25:29 +0800
> > Li Feng <fengli(a)smartx.com> wrote:
> >
> > > Add cc.
> >
> > Sorry, I missed your email. It looks like on Mailman3, if I'm the owner
> > of a list, I'm not automatically a member receiving posts from the list
> > itself -- added myself as member, too.
> >
> > > On Tue, Oct 26, 2021 at 1:28 PM Li Feng <fengli(a)smartx.com> wrote:
> > > >
> > > > Hi,
> > > > I just tested the master code, the passt just exited without any error.
> > > >
> > > > ```
> > > > $ ./passt
> > > > Outbound interface: ens192
> > > > ARP:
> > > > address: 00:50:56:be:9d:1f
> > > > DHCP:
> > > > assign: 192.168.64.217
> > > > mask: 255.255.240.0
> > > > router: 192.168.64.1
> > > > search:
> > > > .
> > > > UNIX domain socket bound at /tmp/passt_1.socket
> > > >
> > > > You can now start qrap:
> > > > ./qrap 5 kvm ... -net socket,fd=5 -net nic,model=virtio
> > > > or directly qemu, patched with:
> > > > qemu/0001-net-Allow-also-UNIX-domain-sockets-to-be-used-as-net.patch
> > > > as follows:
> > > > kvm ... -net socket,connect=/tmp/passt_1.socket -net nic,model=virtio
> > > > 21-10-26 13:23:43 root(a)192.168.64.217:~/passt(master✗)
> >
> > passt will fork into background as soon as it gets a connection. Can
> > you retry running it as:
> >
> > ./passt -f -d
> >
> > so we can see if something strange is going on (-f stands for
> > --foreground, -d for --debug)? Because:
> >
> > > > ```
> > > > Another terminal:
> > > > ```
> > > > $ bash x.sh
> > > > recv: Connection reset by peer
> > > > Probe of /tmp/passt_1.socket failed
> > > > connect: No such file or directory
> > > > Probe of /tmp/passt_2.socket failed
> > > > connect: No such file or directory
> > > > Probe of /tmp/passt_3.socket failed
> > > > ...
> > > > ```
> >
> > ...well, this shouldn't happen. It's probing /tmp/passt_1.socket and
> > failing to get an answer.
> >
> > This just happened to another user, in that case seccomp was
> > terminating passt because on his system daemon() called a different set
> > of syscalls compared to my system:
> >
> > https://passt.top/passt/commit/?id=1fc6416cf9446cbf75818fd61772610e74709065
> >
> > and I expect some more issues like these at the beginning, I didn't
> > test it on different distributions yet.
> >
> > By the way, I'm working on adding tests for a few distributions right
> > now, so that we can catch those early.
> >
> > --
> > Stefano
> >
next prev parent reply other threads:[~2021-10-29 5:27 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-26 5:28 qemu couldn't connect the unix domain socket Li Feng
2021-10-28 4:25 ` Li Feng
2021-10-28 7:30 ` Stefano Brivio
2021-10-29 3:33 ` Li Feng
2021-10-29 5:27 ` Li Feng [this message]
2021-10-29 7:44 ` Stefano Brivio
2021-10-29 8:54 ` Li Feng
2021-10-29 9:34 ` Stefano Brivio
2021-10-29 11:02 ` Li Feng
2021-10-29 11:52 ` Stefano Brivio
2021-10-29 12:20 ` Li Feng
2022-02-03 20:47 ` Stefano Brivio
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CAHckoCzGHToxtgd_BeJDbD5xmv4-NDbejDPq5atE-Tn2VtRgog@mail.gmail.com \
--to=fengli@smartx.com \
--cc=passt-user@passt.top \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for IMAP folder(s).