Public bug reported:

Qemu fails silently with exit code 1 when using daemonize and the
sandbox option elevateprivileges=deny. This behavior got introduced by
0546c0609cb5a8d90c1cbac8e0d64b5a048bbb19  where the sandbox options gets
parsed and enforced *before* daemonizing. Since the os_daemonize libc-
call uses the syscall setsid, qemu gets killed by the signal 13
(SIGSYS).

What I expected:
- a hint in the documentation of the flags that elevateprivileges AND daemonize 
contradict -or-
- working combination

Reproducer:
$ qemu-system-x86_64 -sandbox on,elevateprivileges=deny -daemonize

Package: 1:6.2+dfsg-2ubuntu5
Ubuntu Version: 22.04 (Jammy Jellyfish)
dmesg:
[  181.064898] audit: type=1326 audit(1646924855.830:13): auid=0 uid=0 gid=0 
ses=1 subj=? pid=3622 comm="qemu-system-x86" exe="/usr/bin/qemu-system-x86_64" 
sig=31 arch=c000003e syscall=112 compat=0 ip=0x7f725964f40b code=0x80000000
Coredump:

           PID: 4402 (qemu-system-x86)
           UID: 0 (root)
           GID: 0 (root)
        Signal: 31 (SYS)
     Timestamp: Thu 2022-03-10 15:10:37 UTC (37s ago)
  Command Line: qemu-system-x86_64 -sandbox on,elevateprivileges=deny -daemonize
    Executable: /usr/bin/qemu-system-x86_64
 Control Group: /user.slice/user-0.slice/session-1.scope
          Unit: session-1.scope
         Slice: user-0.slice
       Session: 1
     Owner UID: 0 (root)
       Boot ID: 3cdf72ff261640e3a3f9e887d159bb2a
    Machine ID: 72874f2d047d4c87887abbc727924413
      Hostname: raphael-20220310-145731
       Storage: 
/var/lib/systemd/coredump/core.qemu-system-x86.0.3cdf72ff261640e3a3f9e887d159bb2a.4402.1646925037000000.zst
 (present)
     Disk Size: 405.6K
       Message: Process 4402 (qemu-system-x86) of user 0 dumped core.

                Found module linux-vdso.so.1 with build-id: 
aea445f382fbc134b3bc979d61dd291e78bea882
                Found module libcrypto.so.3 with build-id: 
16bbb788a98f53a5cd5ce19936946a279603f77a
                Found module liblzma.so.5 with build-id: 
3eeacec54c1e109d7486961e9b56c01023dd492e
                Found module libpcre2-8.so.0 with build-id: 
730c613f1746c1ddfca8a4420385ac363e86e2a2
                Found module libblkid.so.1 with build-id: 
cdf95a964e3302bb356fefc4b801fae8c4340b31
                Found module libkmod.so.2 with build-id: 
c8ac4bc8d0fe03ceb8cad8d24484c5cbad9daf5a
                Found module libuuid.so.1 with build-id: 
64c0d0cb22fa2bdeca075a0c0418ba5ff314b220
                Found module libnl-route-3.so.200 with build-id: 
0d1ec15c789fe7cc860df8d8d2004a6c7b03c2a3
                Found module libnl-3.so.200 with build-id: 
63256316bd1135d4745d740781b42ca55f77a24f
                Found module libpcre.so.3 with build-id: 
56ddb828685e501f1498130d1cc7f51c242554c1
                Found module libffi.so.8 with build-id: 
59c2a6b204f74f358ca7711d2dfd349d88711f6a
                Found module libselinux.so.1 with build-id: 
2195967b677f320e35e0cdafe08a4713bc2a95e8
                Found module libmount.so.1 with build-id: 
eeb33f2b4b9c3eb0a29575eb9932ef08663bd836
                Found module libdaxctl.so.1 with build-id: 
f7dfbca3d72bc7ba36d6b60a28119269f2504db2
                Found module libndctl.so.6 with build-id: 
22fb97cc03c9bc2e81c12c5e1f82973cfea86338
                Found module libgmp.so.10 with build-id: 
f110719303ddbea25a5e89ff730fec520eed67b0
                Found module libhogweed.so.6 with build-id: 
01a0b20878b525a7a33197fc23b738654682f3c4
                Found module libtasn1.so.6 with build-id: 
efacd0b1b8ccb481fcb501cf76cf07cb2c444d45
                Found module libunistring.so.2 with build-id: 
ca5149da8d5a298b8f286ffca3d6e2402ec0fe01
                Found module libidn2.so.0 with build-id: 
f477d28cad4d54daee0070cd4949f0487ac93afc
                Found module libp11-kit.so.0 with build-id: 
6e579cbca24932056e99bb54557cd5a1234811ea
                Found module ld-linux-x86-64.so.2 with build-id: 
c83a452679d23179c2ddd07c5c25d182e54908df
                Found module libc.so.6 with build-id: 
094a2d85f72e893d0c15a66812d51d5493e30860
                Found module libgcc_s.so.1 with build-id: 
443a1e5dd16a55fd142e5e5fcdc544ba2052dda0
                Found module libm.so.6 with build-id: 
a9832e9d3a777fc99a89d92e359eec6395deca29
                Found module libaio.so.1 with build-id: 
a21eb19f17dd68947804f035aa6c27cd73a70439
                Found module libfuse3.so.3 with build-id: 
d45830188e873e270f28ab91f11e6fc7d7b2159c
                Found module libnettle.so.8 with build-id: 
89ee6d2af3edfaf90640d96b94afcef1e43d74a2
                Found module libgmodule-2.0.so.0 with build-id: 
d64002b7a12e58f579eecf952daeb61435f8f343
                Found module liburing.so.2 with build-id: 
976771a582fd2e5c62faff76c026b09eaf3335a0
                Found module libudev.so.1 with build-id: 
ffd1278cf71c4c9c09bac7cdefac3d58b9e1d1f8
                Found module libslirp.so.0 with build-id: 
ccb8518051352845e15c5702d534bfb703b683d3
                Found module libzstd.so.1 with build-id: 
b5600f7bc62e7915ed7199c8c486e3ff3af0ce16
                Found module libibverbs.so.1 with build-id: 
b562c2bac28667351afdd7bd49ac534d118c4f6e
                Found module librdmacm.so.1 with build-id: 
72f988fe1f74a0241f65f4cd16ed26df6279920c
                Found module libglib-2.0.so.0 with build-id: 
fb79c175ac99bf40796a1e2c66c4e2bd24aaeeaa
                Found module libgobject-2.0.so.0 with build-id: 
bb28703f64aac29648fdf9ee790291dc2e8f309d
                Found module libgio-2.0.so.0 with build-id: 
8061f2c2287fdb8e35f0dcd0d8cd37f1628478f8
                Found module libnuma.so.1 with build-id: 
0bc332b68b3900db9579c7e29fd534de7250b43e
                Found module libfdt.so.1 with build-id: 
6f636bd87d7fabc7e33e0bb5f813e9c457f65095
                Found module libseccomp.so.2 with build-id: 
50e714eb138a4a1a38f41f084aefb51d6a9ebf1c
                Found module libpmem.so.1 with build-id: 
dee04fd8f01a6c80d81a2e9eec986a30c459ab32
                Found module libsasl2.so.2 with build-id: 
562c038e4a5a2196c9c085cd1f9276e3641399a6
                Found module libgnutls.so.30 with build-id: 
843b60988232157225bc1f0a293321992abd107b
                Found module libjpeg.so.8 with build-id: 
c54abff9294357e28532a76a049a4cb2542fc15b
                Found module libpng16.so.16 with build-id: 
44f16132c2457c1289f64093e541ed4036be19ec
                Found module libz.so.1 with build-id: 
ef650611451904165e9caf6080ecbaad50b84d3f
                Found module libpixman-1.so.0 with build-id: 
da7de7a61faeedaec7d25546ac1b0a9d4f141651
                Found module qemu-system-x86_64 with build-id: 
5cb2521c24e8f3bd7d22a87f13fafc0ba539a8b4
                Stack trace of thread 4402:
                #0  0x00007faf4337d40b setsid (libc.so.6 + 0xf040b)
                #1  0x000055afe3467128 os_daemonize (qemu-system-x86_64 + 
0x848128)
                #2  0x000055afe3314fe3 qemu_init (qemu-system-x86_64 + 0x6f5fe3)
                #3  0x000055afe3008fdd main (qemu-system-x86_64 + 0x3e9fdd)
                #4  0x00007faf432bad90 n/a (libc.so.6 + 0x2dd90)
                #5  0x00007faf432bae40 __libc_start_main (libc.so.6 + 0x2de40)
                #6  0x000055afe300b955 _start (qemu-system-x86_64 + 0x3ec955)

                Stack trace of thread 4403:
                #0  0x00007faf433b7b6d n/a (libc.so.6 + 0x12ab6d)

** Affects: qemu (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "coredump"
   
https://bugs.launchpad.net/bugs/1964488/+attachment/5567734/+files/core.qemu-system-x86.0.3cdf72ff261640e3a3f9e887d159bb2a.4402.1646925037000000

** Description changed:

  Qemu fails silently with exit code 1 when using daemonize and the
  sandbox option elevateprivileges=deny. This behavior got introduced by
  0546c0609cb5a8d90c1cbac8e0d64b5a048bbb19  where the sandbox options gets
  parsed and enforced *before* daemonizing. Since the os_daemonize libc-
  call uses the syscall setsid, qemu gets killed by the signal 13
  (SIGSYS).
  
  What I expected:
- - a hint in the documentation of the flags -or-
+ - a hint in the documentation of the flags that elevateprivileges AND 
daemonize contradict -or-
  - working combination
  
  Reproducer:
  $ qemu-system-x86_64 -sandbox on,elevateprivileges=deny -daemonize
  
  Package: 1:6.2+dfsg-2ubuntu5
  Ubuntu Version: 22.04 (Jammy Jellyfish)
  dmesg:
  [  181.064898] audit: type=1326 audit(1646924855.830:13): auid=0 uid=0 gid=0 
ses=1 subj=? pid=3622 comm="qemu-system-x86" exe="/usr/bin/qemu-system-x86_64" 
sig=31 arch=c000003e syscall=112 compat=0 ip=0x7f725964f40b code=0x80000000
  Coredump:
  
-            PID: 4402 (qemu-system-x86)
-            UID: 0 (root)
-            GID: 0 (root)
-         Signal: 31 (SYS)
-      Timestamp: Thu 2022-03-10 15:10:37 UTC (37s ago)
-   Command Line: qemu-system-x86_64 -sandbox on,elevateprivileges=deny 
-daemonize
-     Executable: /usr/bin/qemu-system-x86_64
-  Control Group: /user.slice/user-0.slice/session-1.scope
-           Unit: session-1.scope
-          Slice: user-0.slice
-        Session: 1
-      Owner UID: 0 (root)
-        Boot ID: 3cdf72ff261640e3a3f9e887d159bb2a
-     Machine ID: 72874f2d047d4c87887abbc727924413
-       Hostname: raphael-20220310-145731
-        Storage: 
/var/lib/systemd/coredump/core.qemu-system-x86.0.3cdf72ff261640e3a3f9e887d159bb2a.4402.1646925037000000.zst
 (present)
-      Disk Size: 405.6K
-        Message: Process 4402 (qemu-system-x86) of user 0 dumped core.
-                 
-                 Found module linux-vdso.so.1 with build-id: 
aea445f382fbc134b3bc979d61dd291e78bea882
-                 Found module libcrypto.so.3 with build-id: 
16bbb788a98f53a5cd5ce19936946a279603f77a
-                 Found module liblzma.so.5 with build-id: 
3eeacec54c1e109d7486961e9b56c01023dd492e
-                 Found module libpcre2-8.so.0 with build-id: 
730c613f1746c1ddfca8a4420385ac363e86e2a2
-                 Found module libblkid.so.1 with build-id: 
cdf95a964e3302bb356fefc4b801fae8c4340b31
-                 Found module libkmod.so.2 with build-id: 
c8ac4bc8d0fe03ceb8cad8d24484c5cbad9daf5a
-                 Found module libuuid.so.1 with build-id: 
64c0d0cb22fa2bdeca075a0c0418ba5ff314b220
-                 Found module libnl-route-3.so.200 with build-id: 
0d1ec15c789fe7cc860df8d8d2004a6c7b03c2a3
-                 Found module libnl-3.so.200 with build-id: 
63256316bd1135d4745d740781b42ca55f77a24f
-                 Found module libpcre.so.3 with build-id: 
56ddb828685e501f1498130d1cc7f51c242554c1
-                 Found module libffi.so.8 with build-id: 
59c2a6b204f74f358ca7711d2dfd349d88711f6a
-                 Found module libselinux.so.1 with build-id: 
2195967b677f320e35e0cdafe08a4713bc2a95e8
-                 Found module libmount.so.1 with build-id: 
eeb33f2b4b9c3eb0a29575eb9932ef08663bd836
-                 Found module libdaxctl.so.1 with build-id: 
f7dfbca3d72bc7ba36d6b60a28119269f2504db2
-                 Found module libndctl.so.6 with build-id: 
22fb97cc03c9bc2e81c12c5e1f82973cfea86338
-                 Found module libgmp.so.10 with build-id: 
f110719303ddbea25a5e89ff730fec520eed67b0
-                 Found module libhogweed.so.6 with build-id: 
01a0b20878b525a7a33197fc23b738654682f3c4
-                 Found module libtasn1.so.6 with build-id: 
efacd0b1b8ccb481fcb501cf76cf07cb2c444d45
-                 Found module libunistring.so.2 with build-id: 
ca5149da8d5a298b8f286ffca3d6e2402ec0fe01
-                 Found module libidn2.so.0 with build-id: 
f477d28cad4d54daee0070cd4949f0487ac93afc
-                 Found module libp11-kit.so.0 with build-id: 
6e579cbca24932056e99bb54557cd5a1234811ea
-                 Found module ld-linux-x86-64.so.2 with build-id: 
c83a452679d23179c2ddd07c5c25d182e54908df
-                 Found module libc.so.6 with build-id: 
094a2d85f72e893d0c15a66812d51d5493e30860
-                 Found module libgcc_s.so.1 with build-id: 
443a1e5dd16a55fd142e5e5fcdc544ba2052dda0
-                 Found module libm.so.6 with build-id: 
a9832e9d3a777fc99a89d92e359eec6395deca29
-                 Found module libaio.so.1 with build-id: 
a21eb19f17dd68947804f035aa6c27cd73a70439
-                 Found module libfuse3.so.3 with build-id: 
d45830188e873e270f28ab91f11e6fc7d7b2159c
-                 Found module libnettle.so.8 with build-id: 
89ee6d2af3edfaf90640d96b94afcef1e43d74a2
-                 Found module libgmodule-2.0.so.0 with build-id: 
d64002b7a12e58f579eecf952daeb61435f8f343
-                 Found module liburing.so.2 with build-id: 
976771a582fd2e5c62faff76c026b09eaf3335a0
-                 Found module libudev.so.1 with build-id: 
ffd1278cf71c4c9c09bac7cdefac3d58b9e1d1f8
-                 Found module libslirp.so.0 with build-id: 
ccb8518051352845e15c5702d534bfb703b683d3
-                 Found module libzstd.so.1 with build-id: 
b5600f7bc62e7915ed7199c8c486e3ff3af0ce16
-                 Found module libibverbs.so.1 with build-id: 
b562c2bac28667351afdd7bd49ac534d118c4f6e
-                 Found module librdmacm.so.1 with build-id: 
72f988fe1f74a0241f65f4cd16ed26df6279920c
-                 Found module libglib-2.0.so.0 with build-id: 
fb79c175ac99bf40796a1e2c66c4e2bd24aaeeaa
-                 Found module libgobject-2.0.so.0 with build-id: 
bb28703f64aac29648fdf9ee790291dc2e8f309d
-                 Found module libgio-2.0.so.0 with build-id: 
8061f2c2287fdb8e35f0dcd0d8cd37f1628478f8
-                 Found module libnuma.so.1 with build-id: 
0bc332b68b3900db9579c7e29fd534de7250b43e
-                 Found module libfdt.so.1 with build-id: 
6f636bd87d7fabc7e33e0bb5f813e9c457f65095
-                 Found module libseccomp.so.2 with build-id: 
50e714eb138a4a1a38f41f084aefb51d6a9ebf1c
-                 Found module libpmem.so.1 with build-id: 
dee04fd8f01a6c80d81a2e9eec986a30c459ab32
-                 Found module libsasl2.so.2 with build-id: 
562c038e4a5a2196c9c085cd1f9276e3641399a6
-                 Found module libgnutls.so.30 with build-id: 
843b60988232157225bc1f0a293321992abd107b
-                 Found module libjpeg.so.8 with build-id: 
c54abff9294357e28532a76a049a4cb2542fc15b
-                 Found module libpng16.so.16 with build-id: 
44f16132c2457c1289f64093e541ed4036be19ec
-                 Found module libz.so.1 with build-id: 
ef650611451904165e9caf6080ecbaad50b84d3f
-                 Found module libpixman-1.so.0 with build-id: 
da7de7a61faeedaec7d25546ac1b0a9d4f141651
-                 Found module qemu-system-x86_64 with build-id: 
5cb2521c24e8f3bd7d22a87f13fafc0ba539a8b4
-                 Stack trace of thread 4402:
-                 #0  0x00007faf4337d40b setsid (libc.so.6 + 0xf040b)
-                 #1  0x000055afe3467128 os_daemonize (qemu-system-x86_64 + 
0x848128)
-                 #2  0x000055afe3314fe3 qemu_init (qemu-system-x86_64 + 
0x6f5fe3)
-                 #3  0x000055afe3008fdd main (qemu-system-x86_64 + 0x3e9fdd)
-                 #4  0x00007faf432bad90 n/a (libc.so.6 + 0x2dd90)
-                 #5  0x00007faf432bae40 __libc_start_main (libc.so.6 + 0x2de40)
-                 #6  0x000055afe300b955 _start (qemu-system-x86_64 + 0x3ec955)
-                 
-                 Stack trace of thread 4403:
-                 #0  0x00007faf433b7b6d n/a (libc.so.6 + 0x12ab6d)
+            PID: 4402 (qemu-system-x86)
+            UID: 0 (root)
+            GID: 0 (root)
+         Signal: 31 (SYS)
+      Timestamp: Thu 2022-03-10 15:10:37 UTC (37s ago)
+   Command Line: qemu-system-x86_64 -sandbox on,elevateprivileges=deny 
-daemonize
+     Executable: /usr/bin/qemu-system-x86_64
+  Control Group: /user.slice/user-0.slice/session-1.scope
+           Unit: session-1.scope
+          Slice: user-0.slice
+        Session: 1
+      Owner UID: 0 (root)
+        Boot ID: 3cdf72ff261640e3a3f9e887d159bb2a
+     Machine ID: 72874f2d047d4c87887abbc727924413
+       Hostname: raphael-20220310-145731
+        Storage: 
/var/lib/systemd/coredump/core.qemu-system-x86.0.3cdf72ff261640e3a3f9e887d159bb2a.4402.1646925037000000.zst
 (present)
+      Disk Size: 405.6K
+        Message: Process 4402 (qemu-system-x86) of user 0 dumped core.
+ 
+                 Found module linux-vdso.so.1 with build-id: 
aea445f382fbc134b3bc979d61dd291e78bea882
+                 Found module libcrypto.so.3 with build-id: 
16bbb788a98f53a5cd5ce19936946a279603f77a
+                 Found module liblzma.so.5 with build-id: 
3eeacec54c1e109d7486961e9b56c01023dd492e
+                 Found module libpcre2-8.so.0 with build-id: 
730c613f1746c1ddfca8a4420385ac363e86e2a2
+                 Found module libblkid.so.1 with build-id: 
cdf95a964e3302bb356fefc4b801fae8c4340b31
+                 Found module libkmod.so.2 with build-id: 
c8ac4bc8d0fe03ceb8cad8d24484c5cbad9daf5a
+                 Found module libuuid.so.1 with build-id: 
64c0d0cb22fa2bdeca075a0c0418ba5ff314b220
+                 Found module libnl-route-3.so.200 with build-id: 
0d1ec15c789fe7cc860df8d8d2004a6c7b03c2a3
+                 Found module libnl-3.so.200 with build-id: 
63256316bd1135d4745d740781b42ca55f77a24f
+                 Found module libpcre.so.3 with build-id: 
56ddb828685e501f1498130d1cc7f51c242554c1
+                 Found module libffi.so.8 with build-id: 
59c2a6b204f74f358ca7711d2dfd349d88711f6a
+                 Found module libselinux.so.1 with build-id: 
2195967b677f320e35e0cdafe08a4713bc2a95e8
+                 Found module libmount.so.1 with build-id: 
eeb33f2b4b9c3eb0a29575eb9932ef08663bd836
+                 Found module libdaxctl.so.1 with build-id: 
f7dfbca3d72bc7ba36d6b60a28119269f2504db2
+                 Found module libndctl.so.6 with build-id: 
22fb97cc03c9bc2e81c12c5e1f82973cfea86338
+                 Found module libgmp.so.10 with build-id: 
f110719303ddbea25a5e89ff730fec520eed67b0
+                 Found module libhogweed.so.6 with build-id: 
01a0b20878b525a7a33197fc23b738654682f3c4
+                 Found module libtasn1.so.6 with build-id: 
efacd0b1b8ccb481fcb501cf76cf07cb2c444d45
+                 Found module libunistring.so.2 with build-id: 
ca5149da8d5a298b8f286ffca3d6e2402ec0fe01
+                 Found module libidn2.so.0 with build-id: 
f477d28cad4d54daee0070cd4949f0487ac93afc
+                 Found module libp11-kit.so.0 with build-id: 
6e579cbca24932056e99bb54557cd5a1234811ea
+                 Found module ld-linux-x86-64.so.2 with build-id: 
c83a452679d23179c2ddd07c5c25d182e54908df
+                 Found module libc.so.6 with build-id: 
094a2d85f72e893d0c15a66812d51d5493e30860
+                 Found module libgcc_s.so.1 with build-id: 
443a1e5dd16a55fd142e5e5fcdc544ba2052dda0
+                 Found module libm.so.6 with build-id: 
a9832e9d3a777fc99a89d92e359eec6395deca29
+                 Found module libaio.so.1 with build-id: 
a21eb19f17dd68947804f035aa6c27cd73a70439
+                 Found module libfuse3.so.3 with build-id: 
d45830188e873e270f28ab91f11e6fc7d7b2159c
+                 Found module libnettle.so.8 with build-id: 
89ee6d2af3edfaf90640d96b94afcef1e43d74a2
+                 Found module libgmodule-2.0.so.0 with build-id: 
d64002b7a12e58f579eecf952daeb61435f8f343
+                 Found module liburing.so.2 with build-id: 
976771a582fd2e5c62faff76c026b09eaf3335a0
+                 Found module libudev.so.1 with build-id: 
ffd1278cf71c4c9c09bac7cdefac3d58b9e1d1f8
+                 Found module libslirp.so.0 with build-id: 
ccb8518051352845e15c5702d534bfb703b683d3
+                 Found module libzstd.so.1 with build-id: 
b5600f7bc62e7915ed7199c8c486e3ff3af0ce16
+                 Found module libibverbs.so.1 with build-id: 
b562c2bac28667351afdd7bd49ac534d118c4f6e
+                 Found module librdmacm.so.1 with build-id: 
72f988fe1f74a0241f65f4cd16ed26df6279920c
+                 Found module libglib-2.0.so.0 with build-id: 
fb79c175ac99bf40796a1e2c66c4e2bd24aaeeaa
+                 Found module libgobject-2.0.so.0 with build-id: 
bb28703f64aac29648fdf9ee790291dc2e8f309d
+                 Found module libgio-2.0.so.0 with build-id: 
8061f2c2287fdb8e35f0dcd0d8cd37f1628478f8
+                 Found module libnuma.so.1 with build-id: 
0bc332b68b3900db9579c7e29fd534de7250b43e
+                 Found module libfdt.so.1 with build-id: 
6f636bd87d7fabc7e33e0bb5f813e9c457f65095
+                 Found module libseccomp.so.2 with build-id: 
50e714eb138a4a1a38f41f084aefb51d6a9ebf1c
+                 Found module libpmem.so.1 with build-id: 
dee04fd8f01a6c80d81a2e9eec986a30c459ab32
+                 Found module libsasl2.so.2 with build-id: 
562c038e4a5a2196c9c085cd1f9276e3641399a6
+                 Found module libgnutls.so.30 with build-id: 
843b60988232157225bc1f0a293321992abd107b
+                 Found module libjpeg.so.8 with build-id: 
c54abff9294357e28532a76a049a4cb2542fc15b
+                 Found module libpng16.so.16 with build-id: 
44f16132c2457c1289f64093e541ed4036be19ec
+                 Found module libz.so.1 with build-id: 
ef650611451904165e9caf6080ecbaad50b84d3f
+                 Found module libpixman-1.so.0 with build-id: 
da7de7a61faeedaec7d25546ac1b0a9d4f141651
+                 Found module qemu-system-x86_64 with build-id: 
5cb2521c24e8f3bd7d22a87f13fafc0ba539a8b4
+                 Stack trace of thread 4402:
+                 #0  0x00007faf4337d40b setsid (libc.so.6 + 0xf040b)
+                 #1  0x000055afe3467128 os_daemonize (qemu-system-x86_64 + 
0x848128)
+                 #2  0x000055afe3314fe3 qemu_init (qemu-system-x86_64 + 
0x6f5fe3)
+                 #3  0x000055afe3008fdd main (qemu-system-x86_64 + 0x3e9fdd)
+                 #4  0x00007faf432bad90 n/a (libc.so.6 + 0x2dd90)
+                 #5  0x00007faf432bae40 __libc_start_main (libc.so.6 + 0x2de40)
+                 #6  0x000055afe300b955 _start (qemu-system-x86_64 + 0x3ec955)
+ 
+                 Stack trace of thread 4403:
+                 #0  0x00007faf433b7b6d n/a (libc.so.6 + 0x12ab6d)

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https://bugs.launchpad.net/bugs/1964488

Title:
  Qemu fails with daemonize and enabled elevateprivileges

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