Closed
Description
Description
The following code: not a specific code
Resulted in this output: -
But I expected this output instead: -
I got some random segfault in php-fpm. It occurs time to time. In the logs of php-fpm I see "child XXX exited on signal 11 (SIGSEGV - core dumped) after ...".
The code is running inside a kubernetes cluster, running some container.
The php extension : php -r 'foreach (get_loaded_extensions() as $extension) echo "$extension: " . phpversion($extension) . "\n";'
Core: 8.3.21
date: 8.3.21
libxml: 8.3.21
openssl: 8.3.21
pcre: 8.3.21
sqlite3: 8.3.21
zlib: 8.3.21
ctype: 8.3.21
curl: 8.3.21
dom: 20031129
fileinfo: 8.3.21
filter: 8.3.21
hash: 8.3.21
iconv: 8.3.21
json: 8.3.21
mbstring: 8.3.21
SPL: 8.3.21
session: 8.3.21
PDO: 8.3.21
pdo_sqlite: 8.3.21
standard: 8.3.21
posix: 8.3.21
random: 8.3.21
readline: 8.3.21
Reflection: 8.3.21
Phar: 8.3.21
SimpleXML: 8.3.21
tokenizer: 8.3.21
xml: 8.3.21
xmlreader: 8.3.21
xmlwriter: 8.3.21
mysqlnd: mysqlnd 8.3.21
apcu: 5.1.24
bcmath: 8.3.21
ds: 1.6.0
sockets: 8.3.21
exif: 8.3.21
gd: 8.3.21
grpc: 1.72.0
intl: 8.3.21
opentelemetry: 1.1.2
pcntl: 8.3.21
pdo_dblib: 8.3.21
pdo_mysql: 8.3.21
protobuf: 4.30.2
redis: 6.2.0
soap: 8.3.21
ev: 1.2.0
sodium: 8.3.21
zip: 1.22.3
Zend OPcache: 8.3.21
I got a trace of the segfault (open it using gdb, bt full)
e4045a668378:/srv/app# gdb /usr/local/sbin/php-fpm /toto/core.php-fpm.82.257cdc11538f4aabb7801c14049cacc9.3137728.1747058258000000/core.php-fpm.82.257cdc11538f4aabb7801c14049cacc9.3137728.1747058258000000
GNU gdb (GDB) 15.2
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Reading symbols from /usr/local/sbin/php-fpm...
(No debugging symbols found in /usr/local/sbin/php-fpm)
warning: Can't open file /dev/zero (deleted) during file-backed mapping note processing
[New LWP 11232]
[New LWP 11220]
Core was generated by `php-fpm:'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 a_crash () at ./arch/x86_64/atomic_arch.h:108
warning: 108 ./arch/x86_64/atomic_arch.h: No such file or directory
[Current thread is 1 (LWP 11232)]
(gdb) bt full
#0 a_crash () at ./arch/x86_64/atomic_arch.h:108
No locals.
#1 get_meta (p=p@entry=0x7f2ed840c0e0 "\300\0026\330.\177") at src/malloc/mallocng/meta.h:141
offset = 0
index = 31
base = 0x7f2ed840c0d0
meta = 0x7f2ed84d2800
area = <optimized out>
#2 0x00007f2eddffbb9f in __libc_free (p=0x7f2ed840c0e0) at src/malloc/mallocng/free.c:105
g = <optimized out>
idx = <optimized out>
stride = <optimized out>
start = <optimized out>
end = <optimized out>
self = <optimized out>
all = <optimized out>
mi = <optimized out>
base = <optimized out>
len = <optimized out>
e = <optimized out>
#3 0x00007f2edb820a20 in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20230831/grpc.so
No symbol table info available.
#4 0x00007f2edb830382 in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20230831/grpc.so
No symbol table info available.
#5 0x00007f2edb8337db in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20230831/grpc.so
No symbol table info available.
#6 0x00007f2edb5bb8ea in std::_Sp_counted_base<(__gnu_cxx::_Lock_policy)2>::_M_release_last_use_cold() () from /usr/local/lib/php/extensions/no-debug-non-zts-20230831/grpc.so
No symbol table info available.
#7 0x00007f2edb827de0 in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20230831/grpc.so
No symbol table info available.
#8 0x00007f2edb82c8c3 in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20230831/grpc.so
No symbol table info available.
#9 0x00007f2edb82c95b in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20230831/grpc.so
No symbol table info available.
#10 0x00007f2edb82cc8d in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20230831/grpc.so
No symbol table info available.
#11 0x00007f2edb849de3 in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20230831/grpc.so
No symbol table info available.
#12 0x00007f2edb84b918 in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20230831/grpc.so
No symbol table info available.
#13 0x00007f2edb84ba8e in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20230831/grpc.so
No symbol table info available.
#14 0x00007f2edba22b70 in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20230831/grpc.so
No symbol table info available.
#15 0x00007f2ede01c9d2 in start (p=0x7f2ed8360750) at src/thread/pthread_create.c:207
args = 0x7f2ed8360750
state = <optimized out>
#16 0x00007f2ede01e314 in __clone () at src/thread/x86_64/clone.s:22
--Type <RET> for more, q to quit, c to continue without paging--
No locals.
Backtrace stopped: frame did not save the PC
(gdb) bt full
#0 a_crash () at ./arch/x86_64/atomic_arch.h:108
No locals.
#1 get_meta (p=p@entry=0x7f2ed840c0e0 "\300\0026\330.\177") at src/malloc/mallocng/meta.h:141
offset = 0
index = 31
base = 0x7f2ed840c0d0
meta = 0x7f2ed84d2800
area = <optimized out>
#2 0x00007f2eddffbb9f in __libc_free (p=0x7f2ed840c0e0) at src/malloc/mallocng/free.c:105
g = <optimized out>
idx = <optimized out>
stride = <optimized out>
start = <optimized out>
end = <optimized out>
self = <optimized out>
all = <optimized out>
mi = <optimized out>
base = <optimized out>
len = <optimized out>
e = <optimized out>
#3 0x00007f2edb820a20 in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20230831/grpc.so
No symbol table info available.
#4 0x00007f2edb830382 in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20230831/grpc.so
No symbol table info available.
#5 0x00007f2edb8337db in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20230831/grpc.so
No symbol table info available.
#6 0x00007f2edb5bb8ea in std::_Sp_counted_base<(__gnu_cxx::_Lock_policy)2>::_M_release_last_use_cold() () from /usr/local/lib/php/extensions/no-debug-non-zts-20230831/grpc.so
No symbol table info available.
#7 0x00007f2edb827de0 in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20230831/grpc.so
No symbol table info available.
#8 0x00007f2edb82c8c3 in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20230831/grpc.so
No symbol table info available.
#9 0x00007f2edb82c95b in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20230831/grpc.so
No symbol table info available.
#10 0x00007f2edb82cc8d in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20230831/grpc.so
No symbol table info available.
#11 0x00007f2edb849de3 in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20230831/grpc.so
No symbol table info available.
#12 0x00007f2edb84b918 in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20230831/grpc.so
No symbol table info available.
#13 0x00007f2edb84ba8e in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20230831/grpc.so
No symbol table info available.
#14 0x00007f2edba22b70 in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20230831/grpc.so
No symbol table info available.
#15 0x00007f2ede01c9d2 in start (p=0x7f2ed8360750) at src/thread/pthread_create.c:207
args = 0x7f2ed8360750
state = <optimized out>
#16 0x00007f2ede01e314 in __clone () at src/thread/x86_64/clone.s:22
--Type <RET> for more, q to quit, c to continue without paging--
No locals.
Backtrace stopped: frame did not save the PC
(gdb) bt full
#0 a_crash () at ./arch/x86_64/atomic_arch.h:108
No locals.
#1 get_meta (p=p@entry=0x7f2ed840c0e0 "\300\0026\330.\177") at src/malloc/mallocng/meta.h:141
offset = 0
index = 31
base = 0x7f2ed840c0d0
meta = 0x7f2ed84d2800
area = <optimized out>
#2 0x00007f2eddffbb9f in __libc_free (p=0x7f2ed840c0e0) at src/malloc/mallocng/free.c:105
g = <optimized out>
idx = <optimized out>
stride = <optimized out>
start = <optimized out>
end = <optimized out>
self = <optimized out>
all = <optimized out>
mi = <optimized out>
base = <optimized out>
len = <optimized out>
e = <optimized out>
#3 0x00007f2edb820a20 in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20230831/grpc.so
No symbol table info available.
#4 0x00007f2edb830382 in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20230831/grpc.so
No symbol table info available.
#5 0x00007f2edb8337db in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20230831/grpc.so
No symbol table info available.
#6 0x00007f2edb5bb8ea in std::_Sp_counted_base<(__gnu_cxx::_Lock_policy)2>::_M_release_last_use_cold() () from /usr/local/lib/php/extensions/no-debug-non-zts-20230831/grpc.so
No symbol table info available.
#7 0x00007f2edb827de0 in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20230831/grpc.so
No symbol table info available.
#8 0x00007f2edb82c8c3 in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20230831/grpc.so
No symbol table info available.
#9 0x00007f2edb82c95b in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20230831/grpc.so
No symbol table info available.
#10 0x00007f2edb82cc8d in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20230831/grpc.so
No symbol table info available.
#11 0x00007f2edb849de3 in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20230831/grpc.so
No symbol table info available.
#12 0x00007f2edb84b918 in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20230831/grpc.so
No symbol table info available.
#13 0x00007f2edb84ba8e in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20230831/grpc.so
No symbol table info available.
#14 0x00007f2edba22b70 in ?? () from /usr/local/lib/php/extensions/no-debug-non-zts-20230831/grpc.so
No symbol table info available.
#15 0x00007f2ede01c9d2 in start (p=0x7f2ed8360750) at src/thread/pthread_create.c:207
args = 0x7f2ed8360750
state = <optimized out>
#16 0x00007f2ede01e314 in __clone () at src/thread/x86_64/clone.s:22
Docker was built using the alpine image from docker hub php:8.3.21-fpm-alpine. It running in non-root user and is using apache through the socket file.
thanks
PHP Version
PHP 8.3.21 (cli) (built: May 9 2025 17:25:07) (NTS)
Copyright (c) The PHP Group
Zend Engine v4.3.21, Copyright (c) Zend Technologies
with Zend OPcache v8.3.21, Copyright (c), by Zend Technologies
Operating System
alpine