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Haproxy 2.0.3 segfaulted

After working for several hours it’s segfaulted:

Aug  1 12:03:50 use1-proxy-02 kernel: [179489.157333] haproxy[14928]: segfault at 38 ip 000000000040b6f9 sp 00007fff9d1e5440 error 6 in haproxy[400000+1a0000]
[root@use1-proxy-02 log]# haproxy -vv
HA-Proxy version 2.0.3 2019/07/23 - https://haproxy.org/
Build options :
  TARGET  = linux-glibc
  CPU     = generic
  CC      = gcc
  CFLAGS  = -O2 -g -fno-strict-aliasing -Wdeclaration-after-statement -fwrapv -Wno-unused-label -Wno-sign-compare -Wno-unused-parameter -Wno-old-style-declaration -Wno-ignored-qualifiers -Wno-clobbered -Wno-missing-field-initializers -Wtype-limits
  OPTIONS = USE_PCRE=1 USE_THREAD=1 USE_REGPARM=1 USE_LINUX_TPROXY=1 USE_OPENSSL=1 USE_ZLIB=1 USE_TFO=1 USE_NS=

Feature list : +EPOLL -KQUEUE -MY_EPOLL -MY_SPLICE +NETFILTER +PCRE -PCRE_JIT -PCRE2 -PCRE2_JIT +POLL -PRIVATE_CACHE +THREAD -PTHREAD_PSHARED +REGPARM -STATIC_PCRE -STATIC_PCRE2 +TPROXY +LINUX_TPROXY +LINUX_SPLICE +LIBCRYPT +CRYPT_H -VSYSCALL +GETADDRINFO +OPENSSL -LUA +FUTEX +ACCEPT4 -MY_ACCEPT4 +ZLIB -SLZ +CPU_AFFINITY +TFO -NS +DL +RT -DEVICEATLAS -51DEGREES -WURFL -SYSTEMD -OBSOLETE_LINKER +PRCTL +THREAD_DUMP -EVPORTS

Default settings :
  bufsize = 16384, maxrewrite = 1024, maxpollevents = 200

Built with multi-threading support (MAX_THREADS=64, default=1).
Built with OpenSSL version : OpenSSL 1.0.1e-fips 11 Feb 2013
Running on OpenSSL version : OpenSSL 1.0.1e-fips 11 Feb 2013
OpenSSL library supports TLS extensions : yes
OpenSSL library supports SNI : yes
OpenSSL library supports : SSLv3 TLSv1.0 TLSv1.1 TLSv1.2
Built with transparent proxy support using: IP_TRANSPARENT IPV6_TRANSPARENT IP_FREEBIND
Built with zlib version : 1.2.3
Running on zlib version : 1.2.8
Compression algorithms supported : identity("identity"), deflate("deflate"), raw-deflate("deflate"), gzip("gzip")
Built with PCRE version : 7.8 2008-09-05
Running on PCRE version : 8.21 2011-12-12
PCRE library supports JIT : no (USE_PCRE_JIT not set)
Encrypted password support via crypt(3): yes

Available polling systems :
      epoll : pref=300,  test result OK
       poll : pref=200,  test result OK
     select : pref=150,  test result OK
Total: 3 (3 usable), will use epoll.

Available multiplexer protocols :
(protocols marked as <default> cannot be specified using 'proto' keyword)
              h2 : mode=HTX        side=FE|BE     mux=H2
              h2 : mode=HTTP       side=FE        mux=H2
       <default> : mode=HTX        side=FE|BE     mux=H1
       <default> : mode=TCP|HTTP   side=FE|BE     mux=PASS

Available services : none

Available filters :
        [SPOE] spoe
        [COMP] compression
        [CACHE] cache
        [TRACE] trace

[root@use1-proxy-02 log]# uname -r
4.14.133-88.105.amzn1.x86_64

Nothing in haproxy logs.

For crash bugs, a stack trace is necessary to understand what happens. If you have a core file, please run it through gdb and issue a thread apply all bt.

finally got the core dump.

# haproxy -vv
HA-Proxy version 2.0.3 2019/07/23 - https://haproxy.org/
Build options :
  TARGET  = linux-glibc
  CPU     = generic
  CC      = gcc
  CFLAGS  = -O0 -g -fno-strict-aliasing
  OPTIONS = USE_PCRE=1 USE_THREAD=1 USE_REGPARM=1 USE_LINUX_TPROXY=1 USE_OPENSSL=1 USE_ZLIB=1 USE_TFO=1 USE_NS=

Feature list : +EPOLL -KQUEUE -MY_EPOLL -MY_SPLICE +NETFILTER +PCRE -PCRE_JIT -PCRE2 -PCRE2_JIT +POLL -PRIVATE_CACHE +THREAD -PTHREAD_PSHARED +REGPARM -STATIC_PCRE -STATIC_PCRE2 +TPROXY +LINUX_TPROXY +LINUX_SPLICE +LIBCRYPT +CRYPT_H -VSYSCALL +GETADDRINFO +OPENSSL -LUA +FUTEX +ACCEPT4 -MY_ACCEPT4 +ZLIB -SLZ +CPU_AFFINITY +TFO -NS +DL +RT -DEVICEATLAS -51DEGREES -WURFL -SYSTEMD -OBSOLETE_LINKER +PRCTL +THREAD_DUMP -EVPORTS

Default settings :
  bufsize = 16384, maxrewrite = 1024, maxpollevents = 200

Built with multi-threading support (MAX_THREADS=64, default=1).
Built with OpenSSL version : OpenSSL 1.0.1e-fips 11 Feb 2013
Running on OpenSSL version : OpenSSL 1.0.1e-fips 11 Feb 2013
OpenSSL library supports TLS extensions : yes
OpenSSL library supports SNI : yes
OpenSSL library supports : SSLv3 TLSv1.0 TLSv1.1 TLSv1.2
Built with transparent proxy support using: IP_TRANSPARENT IPV6_TRANSPARENT IP_FREEBIND
Built with zlib version : 1.2.3
Running on zlib version : 1.2.8
Compression algorithms supported : identity("identity"), deflate("deflate"), raw-deflate("deflate"), gzip("gzip")
Built with PCRE version : 7.8 2008-09-05
Running on PCRE version : 8.21 2011-12-12
PCRE library supports JIT : no (USE_PCRE_JIT not set)
Encrypted password support via crypt(3): yes

Available polling systems :
      epoll : pref=300,  test result OK
       poll : pref=200,  test result OK
     select : pref=150,  test result OK
Total: 3 (3 usable), will use epoll.

Available multiplexer protocols :
(protocols marked as <default> cannot be specified using 'proto' keyword)
              h2 : mode=HTX        side=FE|BE     mux=H2
              h2 : mode=HTTP       side=FE        mux=H2
       <default> : mode=HTX        side=FE|BE     mux=H1
       <default> : mode=TCP|HTTP   side=FE|BE     mux=PASS

Available services : none

Available filters :
        [SPOE] spoe
        [COMP] compression
        [CACHE] cache
        [TRACE] trace
# gdb ./haproxy core.7575
GNU gdb (GDB) Amazon Linux (7.6.1-64.33.amzn1)
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-amazon-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /root/haproxy...done.
[New LWP 7575]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Core was generated by `/usr/sbin/haproxy -d -f /etc/haproxy/haproxy.cfg -p /var/run/haproxy.pid'.
Program terminated with signal 11, Segmentation fault.
#0  ssl_unsubscribe (conn=0x270aee0, xprt_ctx=0x0, event_type=1, param=0x2d1d020) at src/ssl_sock.c:5599
5599    src/ssl_sock.c: No such file or directory.
(gdb) thread apply all bt

Thread 1 (Thread 0x7f01cc5e1ac0 (LWP 7575)):
#0  ssl_unsubscribe (conn=0x270aee0, xprt_ctx=0x0, event_type=1, param=0x2d1d020) at src/ssl_sock.c:5599
#1  0x0000000000521589 in mux_pt_attach (conn=0x270aee0, sess=<optimized out>) at src/mux_pt.c:149
#2  0x00000000004dcee3 in connect_server (s=0x2dad350) at src/backend.c:1437
#3  0x0000000000448463 in sess_update_stream_int (s=0x2dad350) at src/stream.c:1002
#4  0x000000000044b9ae in process_stream (t=0x29f0ea0, context=0x2dad350, state=<optimized out>) at src/stream.c:2398
#5  0x000000000051d8a3 in process_runnable_tasks () at src/task.c:412
#6  0x000000000048d868 in run_poll_loop () at src/haproxy.c:2516
#7  run_thread_poll_loop (data=<optimized out>) at src/haproxy.c:2637
#8  0x00000000004923b3 in main (argc=<optimized out>, argv=<optimized out>) at src/haproxy.c:3314

Is that all? Are you running with nbthread 1 or why is there only one thread in the stacktrace?

nbthread is not set in my config. stats frontend displays nbthread=1

Please file a bug on github with the informations from this thread.

Done: https://github.com/haproxy/haproxy/issues/211

1 Like