php
Segfault when using FrankenPHP with Laravel
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
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).
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)
