[Qemu-devel] [Bug 1823790] Re: QEMU mishandling of SO_PEERSEC forces systemd into tight loop

[Fritz Katze]

I patched linux-user/syscall.c (see below, branch stable-2.11) which works 
around my problem.
So far so good, but the qemu-arm that i compiled is terribly slow compared to 
the one that came with Ubuntu 18.04. Any hints?
I configured as this:
./configure --static --enable-kvm --target-list=arm-linux-user

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 74d56e2ee6..4fa9a09b12 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -3185,6 +3185,8 @@ static abi_long do_getsockopt(int sockfd, int level, int 
optname,
         case TARGET_SO_SNDTIMEO:
         case TARGET_SO_PEERNAME:
             goto unimplemented;
+        case TARGET_SO_PEERSEC: /* added to escape infinite loop */
+            goto unimplemented;
         case TARGET_SO_PEERCRED: {
             struct ucred cr;
             socklen_t crlen;

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https://bugs.launchpad.net/bugs/1823790

Title:
  QEMU mishandling of SO_PEERSEC forces systemd into tight loop

Status in QEMU:
  New

Bug description:
  While building Debian images for embedded ARM target systems I
  detected that QEMU seems to force newer systemd daemons into a tight
  loop.

  My setup is the following:

  Host machine: Ubuntu 18.04, amd64
  LXD container: Debian Buster, arm64, systemd 241
  QEMU: qemu-aarch64-static, 4.0.0-rc2 (custom build) and 3.1.0 (Debian 
1:3.1+dfsg-7)

  To easily reproduce the issue I have created the following repository:
  https://github.com/lueschem/edi-qemu

  The call where systemd gets looping is the following:
  2837 getsockopt(3,1,31,274891889456,274887218756,274888927920) = -1 errno=34 
(Numerical result out of range)

  Furthermore I also verified that the issue is not related to LXD.
  The same behavior can be reproduced using systemd-nspawn.

  This issue reported against systemd seems to be related:
  https://github.com/systemd/systemd/issues/11557

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