Segfault when using FrankenPHP with Laravel

[Muvikx]

What happened?

Segfault when spamming same page.

I use use FrankenPHP with octane insine a Docker

./frankenphp -v FrankenPHP v1.1.0 PHP 8.3.2 Caddy v2.7.6 h1:w0NymbG2m9PcvKWsrXO6EEkY9Ru4FJK8uQbYcev1p3A=

php -v Zend Engine v4.3.2, Copyright (c) Zend Technologies

Starting server with php artisan octane:start --server=frankenphp --host=0.0.0.0 --port=8000

Build Type

Official static build

Worker Mode

Yes

Operating System

GNU/Linux

CPU Architecture

x86_64

Relevant log output

app-1    | newfstatat(AT_FDCWD, "/var/www/html/vendor/composer/../laravel/framework/src/Illuminate/Support/Lottery.php", {st_mode=S_IFREG|0644, st_size=5791, ...}, AT_SYMLINK_NOFOLLOW) = 0
app-1    | openat(AT_FDCWD, "/var/www/html/vendor/laravel/framework/src/Illuminate/Support/Lottery.php", O_RDONLY) = 6
app-1    | newfstatat(6, "", {st_mode=S_IFREG|0644, st_size=5791, ...}, AT_EMPTY_PATH) = 0
app-1    | read(6, "<?php\n\nnamespace Illuminate\\Supp"..., 5791) = 5791
app-1    | close(6)                                = 0
app-1    | getrandom("\x28\x13\xc4\xce\x48\x3d\xd5\x10", 8, 0) = 8
app-1    | mmap(NULL, 65536, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f6be283f000
app-1    | getrandom("\xeb\xf2\x8f\xe3\x5d\xdc\xa5\xfb", 8, 0) = 8
app-1    | close(3)                                = 0
app-1    | rt_sigaction(SIGINT, {sa_handler=0x561de13f54e0, sa_mask=~[ILL TRAP ABRT BUS FPE KILL SEGV CONT STOP TSTP TTIN TTOU SYS RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_INTERRUPT|SA_SIGINFO, sa_restorer=0x7f6be561c050}, NULL, 8) = 0
app-1    | rt_sigprocmask(SIG_UNBLOCK, [INT], NULL, 8) = 0
app-1    | rt_sigaction(SIGTERM, {sa_handler=0x561de13f54e0, sa_mask=~[ILL TRAP ABRT BUS FPE KILL SEGV CONT STOP TSTP TTIN TTOU SYS RTMIN RT_1], sa_flags=SA_RESTORER|SA_ONSTACK|SA_INTERRUPT|SA_SIGINFO, sa_restorer=0x7f6be561c050}, NULL, 8) = 0
app-1    | rt_sigprocmask(SIG_UNBLOCK, [TERM], NULL, 8) = 0
app-1    | munmap(0x7f6be284f000, 65536)           = 0
app-1    | close(4)                                = 0
app-1    | sendto(5, "\1\0\0\0\1", 5, MSG_DONTWAIT, NULL, 0) = 5
app-1    | close(5)                                = 0
app-1    | munmap(0x7f6be2200000, 2097152)         = 0
app-1    | munmap(0x7f6be2000000, 2097152)         = 0
app-1    | munmap(0x7f6be1e00000, 2097152)         = 0
app-1    | munmap(0x7f6be1800000, 2097152)         = 0
app-1    | munmap(0x7f6be1c00000, 2097152)         = 0
app-1    | munmap(0x7f6be1400000, 2097152)         = 0
app-1    | munmap(0x7f6be1200000, 2097152)         = 0
app-1    | munmap(0x7f6be28be000, 111960)          = 0
app-1    | munmap(0x7f6be2864000, 365576)          = 0
app-1    | munmap(0x7f6be285f000, 16400)           = 0
app-1    | munmap(0x7f6be28da000, 33464)           = 0
app-1    | munmap(0x7f6be28e3000, 46000)           = 0
app-1    | munmap(0x7f6be2806000, 196608)          = 0
app-1    | munmap(0x7f6be1a00000, 2097152)         = 0
app-1    | munmap(0x7f6be0a00000, 2097152)         = 0
app-1    | munmap(0x7f6be0c00000, 2097152)         = 0
app-1    | munmap(0x7f6be0e00000, 2097152)         = 0
app-1    | munmap(0x7f6be1000000, 2097152)         = 0
app-1    | munmap(0x7f6be1600000, 2097152)         = 0
app-1    | munmap(0x7f6be0800000, 2097152)         = 0
app-1    | munmap(0x7f6be2600000, 2097152)         = 0
app-1    | munmap(0x7f6be25af000, 331776)          = 0
app-1    | futex(0x7f6be5f105d8, FUTEX_WAKE_PRIVATE, 2147483647) = 0
app-1    | exit_group(139)                         = ?
app-1    | +++ exited with 139 +++
app-1 exited with code 139

[withinboredom]

Looks like a segfault trying to get some random bits?

If you are using cryptographically random numbers and don't have enough entropy, I wonder if this could happen...

When spamming the page, and monitoring watch cat /proc/sys/kernel/random/entropy_avail, it should be well above 100, if it gets near 0 then random things are going to stop working (or at least block IIRC, but no idea how this would be handled in PHP or if it is handled correctly).

[Muvikx]

I tried to monitor with watch cat /proc/sys/kernel/random/entropy_avail but value is always 256, I tried localy without Docker and segfault appear randomly when i'm on the pulse panel (using livewire)

[Muvikx]

Looks like it won't crash without octane

[withinboredom]

I wonder if it is related to other livewire issues reported here?

[dunglas]

Would you be able to give me access to the crashing code, even privately?