From: Sachin Sant <sachinp@xxxxxxxxxxxxx> Date: Tue, 28 Jun 2022 12:41:35 +0530 >>> I have attached dmesg log for reference. Let me know if any additional >>> Information is required. >> >> * Could you provide >> * dmesg and /var/log/messages on a successful case? (without the commit) >> * Unit file >> * repro steps > > I have attached the relevant log files. The attached tarball contains > dmesg, /var/log/messages and strace o/p for fprintd service collected > for working case and failure case. Thanks for your help! >> * Is it reproducible after login? (e.g. systemctl restart) >> * If so, please provide >> * the result of strace -t -ff >> > Yes, the problem can be recreated after login. I have collected the strace > logs. I confirmed fprintd failed to launch with this message on failure case. === ltcden8-lp6 fprintd[2516]: (fprintd:2516): fprintd-WARNING **: 01:56:45.705: Failed to open connection to bus: Could not connect: Connection refused === But in the strace log of both cases, only one socket is created and following connect() completes without an error. And the peer socket does not seem to be d-bus one. === $ cat working-case/strace-fprintd-service.log | grep "socket(" 01:52:08 socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 3 $ cat working-case/strace-fprintd-service.log | grep "socket(" -A 10 01:52:08 socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 3 ... 01:52:08 connect(3, {sa_family=AF_UNIX, sun_path="/run/systemd/private"}, 22) = 0 ... $ cat not-working-case/strace-fprintd-service.log | grep "socket(" 01:58:14 socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 3 $ cat not-working-case/strace-fprintd-service.log | grep "socket(" -A 10 01:58:14 socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0) = 3 ... 01:58:14 connect(3, {sa_family=AF_UNIX, sun_path="/run/systemd/private"}, 22) = 0 === So I think the error message part is not traced well. Could you try to strace directly for the command in ExecStart section of its unit file? >> * Does it happen on only powerpc? How about x86 or arm64? >> > I have attempted this only on powerpc. Don’t have access to arm or x86 > setup to attempt it. I tried on my machine but fprintd launched successfully in both cases. And few minutes later, it exited because there was no dedicated device for fprintd, I think. === $ sudo systemctl status fprintd ● fprintd.service - Fingerprint Authentication Daemon Loaded: loaded (/usr/lib/systemd/system/fprintd.service; static; vendor preset: disabled) Active: inactive (dead) Docs: man:fprintd(1) Jun 29 05:46:22 ip-10-0-0-163.ap-northeast-1.compute.internal systemd[1]: Starting Fingerprint Authentication Daemon... Jun 29 05:46:22 ip-10-0-0-163.ap-northeast-1.compute.internal systemd[1]: Started Fingerprint Authentication Daemon. Jun 29 05:46:22 ip-10-0-0-163.ap-northeast-1.compute.internal fprintd[1291]: Launching FprintObject Jun 29 05:46:22 ip-10-0-0-163.ap-northeast-1.compute.internal fprintd[1291]: D-Bus service launched with name: net.reactivated.Fprint Jun 29 05:46:22 ip-10-0-0-163.ap-northeast-1.compute.internal fprintd[1291]: entering main loop Jun 29 05:46:52 ip-10-0-0-163.ap-northeast-1.compute.internal fprintd[1291]: No devices in use, exit ===