Stuck on "making app single instance" in Linux Mint

[IF-Adin]

Bug Description

Since the last update, Signal fails to start:

Set Windows Application User Model ID (AUMID) { appUserModelId: 'org.whispersystems.signal-desktop' }

NODE_ENV production

NODE_CONFIG_DIR /opt/Signal/resources/app.asar/config

NODE_CONFIG {}

ALLOW_CONFIG_MUTATIONS undefined

HOSTNAME undefined

NODE_APP_INSTANCE undefined

SUPPRESS_NO_CONFIG_WARNING undefined

userData: /home/redacted/.config/Signal

config/get: Did not find user config file, cache is now empty object

config/get: Did not find ephemeral config file, cache is now empty object

making app single instance

I tried starting it with sudo, same result.

Steps to Reproduce

Start signal

Actual Result:

Signal fails to start

Expected Result:

Signal starts normally

Platform Info

Signal Version:

I can not start the app, so i can't know for sure, but i installed the latest update yesterday.
apt-cache reports:

signal-desktop:
Installed: 1.27.2
Candidate: 1.27.2

Operating System:
Linux Mint 19.2 Cinnamon
Kernel 5.1.3-050103-generic

[kibrovic]

I have the same issue on Debian 10 Buster. Checked /var/log/syslog and found:

debian kernel: [  234.040302] traps: signal-desktop[2684] trap int3 ip:557292d658c5 sp:7ffe61708550 error:0 in signal-desktop[557290de8000+531e000]

After downgrading to 1.26.2 Signal worked without any problems. Tried the Beta version too, same issue happened

[IF-Adin]

@kibrovic Sadly i can't even begin to imagine what that would mean. Is there a way to start it more verbosely or debug it?

[kibrovic]

I managed to solve my problem.

Steps

~$ signal-desktop --verbose
[16488:0913/165205.767249:FATAL:setuid_sandbox_host.cc(157)] The SUID sandbox helper binary was found, but is not configured correctly. Rather than run without sandboxing I'm aborting now. You need to make sure that /opt/Signal/chrome-sandbox is owned by root and has mode 4755.
Trace/breakpoint trap

Turns out, my /opt/Signal/chrome-sandbox was owned by root, but had 755 permissions (-rwxr-xr-x). Changed it, now works OK.

~$ sudo chmod 4755 /opt/Signal/chrome-sandbox

Hope it helps. Don't know why I didn't try verbose earlier -_-

[scottnonnenberg-signal]

Okay, so this is a duplicate to #3536

[IF-Adin]

Okay, so this is a duplicate to #3536

I'm sorry, but i tried both --no-sandbox and --verbose and i tried the fix suggested by @kibrovic but neither of these yielded any result. I have nothing in my syslog either.

The output of --verbose is precisely the same as in my first post.

[scottnonnenberg-signal]

@IF-Adin Okay, so it seems you do have a different issue than some of the folks who have commented here. My recommendation would be to use strace to figure out what Signal Desktop was trying to do when it stopped.

[IF-Adin]

socket(AF_UNIX, SOCK_STREAM, 0)         = 53
fcntl(53, F_GETFD)                      = 0
fcntl(53, F_SETFD, FD_CLOEXEC)          = 0
bind(53, {sa_family=AF_UNIX, sun_path="/tmp/.org.chromium.Chromium.grJSnJ/SS"}, 110) = 0
listen(53, 5)                           = 0
mprotect(0x21e2f8542000, 249856, PROT_READ|PROT_WRITE) = 0
mprotect(0x21e2f8542000, 249856, PROT_READ|PROT_EXEC) = 0
pread64(49, "const path = require('path');\nco"..., 1459, 11138669) = 1459
openat(AT_FDCWD, "/dev/null", O_RDONLY) = 54
rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], [], 8) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f13cdffc2d0) = 12099
rt_sigprocmask(SIG_SETMASK, [], ~[KILL STOP RTMIN RT_1], 8) = 0
close(54)                               = 0
getpid()                                = 11349
openat(AT_FDCWD, "/proc/12099/stat", O_RDONLY|O_CLOEXEC) = 54
stat("/proc/12099/stat", {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
fstat(54, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
read(54, "12099 (signal-desktop) R 11349 1"..., 65536) = 323
read(54, "", 64512)                     = 0
close(54)                               = 0
madvise(0x1935e0e9d000, 69632, MADV_DONTNEED) = 0
wait4(12099,

That's when it stops. It just seems to wait for something?

[scottnonnenberg-signal]

What it's trying to do at that point is look for other instances of Signal Desktop currently running. If it finds any, it will stop initializing and send a message to that other instance to focus itself.

It appears that the underlying mechanism used to find that other instance is causing problems?

[IF-Adin]

@scottnonnenberg I wish i could help more with this, but frankly i do not know what could possibly be causing this.

[IF-Adin]

Update: The snap version of signal-desktop seems to work just fine, even at the newest version.

[scottnonnenberg-signal]

Going back to your strace output - is that complete output? Is more than just Signal Desktop going into a hang there?

[IF-Adin]

@scottnonnenberg-signal The complete output was around 5000 lines.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This issue has been closed due to inactivity.