app-compat: Assertion failed when running node with app-elfloader

[razvand]

Describe the bug

When using app-elfloader (via the run_app.sh script in run-app-elfloader) to run the node-musl static PIE build, an assertion appears.

Steps to reproduce

You can use the ./do.sh script in the unikraft-upb/scripts repository:

$ ./do.sh setup
$ ./do.sh build
$ ./do.sh run_built node_static_musl

Expected behavior

A Node server should start, waiting for connections.

Which architectures were you using or does this bug affect?

x86_64

Which platforms were you using or does this bug affect?

kvm

Relevant log output

mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, fd:-1, 0) = va:0x1000093000
eventfd2(0x0, 0x80800, ...) = Invalid argument (-22)
close(fd:6) = OK
close(fd:7) = OK
munmap(va:0x1000093000) = OK
getpid() = pid:0
../app-elfloader/build/app-elfloader_kvm-x86_64[0]: ../src/tracing/agent.cc:55:node::tracing::Agent::Agent()writev(0x2, 0x40008f790, ...) = 0x6c
: Assertion `(uv_loop_init(&tracing_loop_)) == (0)' failed.
writev(0x2, 0x40008f870, ...) = 0x3c
rt_sigprocmask(0x0, 0x474497888, ...) = 0x0
tkill(0x0, 0x6, ...) = 0x0
rt_sigprocmask(0x2, 0x40008fa40, ...) = 0x0
rt_sigprocmask(0x0, 0x474497890, ...) = 0x0
rt_sigaction(0x6, 0x40008faf0, ...) = 0x0
tkill(0x0, 0x6, ...) = 0x0
rt_sigprocmask(0x1, 0x40008fae8, ...) = 0x0

[flpostolache]

Hello, @razvand. I recreated the problem using the steps above. This specific problem comes from the failure of the eventfd2 syscall. These three PRs #754 #756 #798 added on top of Unikraft solve this issue. For the syscall to succeed only #754 is needed.

[flpostolache]

Update. I wasn't aware of PR #850. Because 9pfs_ioctl is not implemented, the fcntl function will fail and the assert in do_eventfd will stop the execution of the program.

[razvand]

So, @maniatro111, what is the state of it? I moved it for release 0.14 just in case.

[razvand]

Solved in #850