Issue #20592 has been reported by haukot (Dmitry Davydov). ---------------------------------------- Bug #20592: Interrupting Addrinfo causes Segmentation fault on alpine https://bugs.ruby-lang.org/issues/20592 * Author: haukot (Dmitry Davydov) * Status: Open * ruby -v: ruby 3.4.0preview1 (2024-05-16 master 9d69619623) [x86_64-linux-musl] * Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN ---------------------------------------- On Alpine 3.20 got a segfault when interrupting Addrinfo request which would resolve with error. Same on ruby 3.3.1 (2024-04-23 revision c56cd86388) [x86_64-linux-musl] Tried on docker image alpine3.20 and ruby:3.4.0-preview1-alpine. ```ruby # test.rb require 'socket' require 'timeout' begin Addrinfo.ip("1234.example.com") rescue StandardError => e puts e end sleep 10 # wait getaddrinfo to resolve and fail ``` ``` /app # ruby test.rb execution expired [BUG] Segmentation fault at 0x0000000000000028 ruby 3.4.0preview1 (2024-05-16 master 9d69619623) [x86_64-linux-musl] -- Machine register context ------------------------------------------------ RIP: 0x00007fefe4cd4886 RBP: 0x0000000000000001 RSP: 0x00007fefc95d3a10 RAX: 0x0000000000000001 RBX: 0x00007fefc94212e0 RCX: 0x00007fefc95d0b70 RDX: 0x0000000000000010 RDI: 0x0000000000000000 RSI: 0x00007fefc95d08f0 R8: 0x0000000000000000 R9: 0x0000000000000000 R10: 0x0000000000000000 R11: 0x0000000000000217 R12: 0x00007fefc9421340 R13: 0x00007fff5a0ec750 R14: 0x00007fefe4649b10 R15: 0x00007fefc95d3b38 EFL: 0x0000000000010202 -- Other runtime information ----------------------------------------------- ``` gdb logs ``` /app # gdb -q --args ruby test.rb (gdb) run Starting program: /usr/local/bin/ruby test.rb warning: Error disabling address space randomization: Operation not permitted [New LWP 36] [New LWP 37] [New LWP 38] execution expired Thread 4 "ruby" received signal SIGSEGV, Segmentation fault. [Switching to LWP 38] 0x00007f0a2c33b886 in freeaddrinfo (p=0x0) at src/network/freeaddrinfo.c:10 warning: 10 src/network/freeaddrinfo.c: No such file or directory (gdb) bt #0 0x00007f0a2c33b886 in freeaddrinfo (p=0x0) at src/network/freeaddrinfo.c:10 #1 0x00007f0a10c1e940 in do_getaddrinfo (ptr=0x7f0a10f61200) at raddrinfo.c:426 #2 0x00007f0a2c35c349 in start (p=0x7f0a10afaa88) at src/thread/pthread_create.c:207 #3 0x00007f0a2c35e95f in __clone () at src/thread/x86_64/clone.s:22 Backtrace stopped: frame did not save the PC (gdb) info args p = 0x0 ``` There are no errors if Addrinfo resolves with data ``` Timeout.timeout(0.01) { Addrinfo.ip("ruby-lang.org") } # finishes correctly ``` The problem is that freeaddrinfo on alpine does not accept a NULL pointer (ref https://git.musl-libc.org/cgit/musl/tree/src/network/freeaddrinfo.c) ---Files-------------------------------- segfault_gdb (1.56 KB) segfault (14.1 KB) -- https://bugs.ruby-lang.org/