Hi, everybody!

Got multiple incidents of failure with 1.9.6:
Core was generated by `/usr/sbin/haproxy -Ws -f /etc/haproxy/haproxy.cfg -p
/var/run/haproxy'.
Program terminated with signal SIGFPE, Arithmetic exception.
#0  0x0000559afb73c533 in fwrr_update_position (grp=0x559afbd9fb68,
grp=0x559afbd9fb68, s=0x559afcc5f560) at src/lb_fwrr.c:498
498 HA_ATOMIC_ADD(&s->npos, (grp->next_weight / s->cur_eweight));
[Current thread is 1 (Thread 0x7f879677c700 (LWP 776412))]
(gdb) thread apply all bt

Thread 4 (Thread 0x7f879577a700 (LWP 776414)):
#0  0x00007f87981eba13 in epoll_wait () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x0000559afb605c1d in _do_poll (p=<optimized out>, exp=-507048085) at
src/ev_epoll.c:156
#2  0x0000559afb6a8571 in run_poll_loop () at src/haproxy.c:2675
#3  run_thread_poll_loop (data=<optimized out>) at src/haproxy.c:2707
#4  0x00007f879921b6ba in start_thread () from
/lib/x86_64-linux-gnu/libpthread.so.0
#5  0x00007f87981eb41d in clone () from /lib/x86_64-linux-gnu/libc.so.6

Thread 3 (Thread 0x7f8799a10180 (LWP 776411)):
#0  conn_fd_handler (fd=<optimized out>) at src/connection.c:136
#1  0x0000559afb72c783 in fdlist_process_cached_events (fdlist=<optimized
out>) at src/fd.c:443
#2  fd_process_cached_events () at src/fd.c:461
#3  0x0000559afb6a858d in run_poll_loop () at src/haproxy.c:2678
#4  run_thread_poll_loop (data=<optimized out>) at src/haproxy.c:2707
#5  0x0000559afb60368c in main (argc=<optimized out>, argv=<optimized out>)
at src/haproxy.c:3343

Thread 2 (Thread 0x7f8795f7b700 (LWP 776413)):
#0  0x00007f87981eba13 in epoll_wait () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x0000559afb605c1d in _do_poll (p=<optimized out>, exp=-507048086) at
src/ev_epoll.c:156
#2  0x0000559afb6a8571 in run_poll_loop () at src/haproxy.c:2675
#3  run_thread_poll_loop (data=<optimized out>) at src/haproxy.c:2707
#4  0x00007f879921b6ba in start_thread () from
/lib/x86_64-linux-gnu/libpthread.so.0
#5  0x00007f87981eb41d in clone () from /lib/x86_64-linux-gnu/libc.so.6

Thread 1 (Thread 0x7f879677c700 (LWP 776412)):
#0  0x0000559afb73c533 in fwrr_update_position (grp=0x559afbd9fb68,
grp=0x559afbd9fb68, s=0x559afcc5f560) at src/lb_fwrr.c:498
#1  fwrr_get_next_server (p=0x559afbd9ee40, srvtoavoid=srvtoavoid@entry=0x0)
at src/lb_fwrr.c:568
#2  0x0000559afb6eccb8 in assign_server (s=s@entry=0x7f8791135aa0) at
src/backend.c:673
#3  0x0000559afb6ed817 in assign_server_and_queue (s=s@entry=0x7f8791135aa0)
at src/backend.c:963
#4  0x0000559afb6f0b17 in assign_server_and_queue (s=0x7f8791135aa0) at
include/proto/freq_ctr.h:55
#5  srv_redispatch_connect (s=s@entry=0x7f8791135aa0) at src/backend.c:1621
#6  0x0000559afb66461c in sess_prepare_conn_req (s=0x7f8791135aa0) at
src/stream.c:1160
#7  process_stream (t=<optimized out>, context=0x7f8791135aa0,
state=<optimized out>) at src/stream.c:2307
#8  0x0000559afb73105d in process_runnable_tasks () at src/task.c:434
#9  0x0000559afb6a85a0 in run_poll_loop () at src/haproxy.c:2642
#10 run_thread_poll_loop (data=<optimized out>) at src/haproxy.c:2707
#11 0x00007f879921b6ba in start_thread () from
/lib/x86_64-linux-gnu/libpthread.so.0
#12 0x00007f87981eb41d in clone () from /lib/x86_64-linux-gnu/libc.so.6
(gdb) thread 1
[Switching to thread 1 (Thread 0x7f879677c700 (LWP 776412))]
#0  0x0000559afb73c533 in fwrr_update_position (grp=0x559afbd9fb68,
grp=0x559afbd9fb68, s=0x559afcc5f560) at src/lb_fwrr.c:498
498 HA_ATOMIC_ADD(&s->npos, (grp->next_weight / s->cur_eweight));
(gdb) print s->cur_eweight
$4 = 208
(gdb) print grp->next_weight
$5 = 36416
(gdb) print s->npos
$6 = 88637

# haproxy -vv
HA-Proxy version 1.9.6-1 2019/03/29 - https://haproxy.org/
Build options :
  TARGET  = linux2628
  CPU     = generic
  CC      = gcc
  CFLAGS  = -O2 -g -O2 -fPIE -fstack-protector-strong -Wformat
-Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2
-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_GETADDRINFO=1 USE_ZLIB=1 USE_REGPARM=1 USE_OPENSSL=1
USE_LUA=1 USE_SYSTEMD=1 USE_PCRE2=1 USE_PCRE2_JIT=1 USE_TFO=1 USE_NS=1

Default settings :
  maxconn = 2000, bufsize = 16384, maxrewrite = 1024, maxpollevents = 200

Built with OpenSSL version : OpenSSL 1.0.2g  1 Mar 2016
Running on OpenSSL version : OpenSSL 1.0.2g  1 Mar 2016
OpenSSL library supports TLS extensions : yes
OpenSSL library supports SNI : yes
OpenSSL library supports : TLSv1.0 TLSv1.1 TLSv1.2
Built with Lua version : Lua 5.3.1
Built with network namespace support.
Built with transparent proxy support using: IP_TRANSPARENT IPV6_TRANSPARENT
IP_FREEBIND
Built with zlib version : 1.2.8
Running on zlib version : 1.2.8
Compression algorithms supported : identity("identity"),
deflate("deflate"), raw-deflate("deflate"), gzip("gzip")
Built with PCRE2 version : 10.21 2016-01-12
PCRE2 library supports JIT : yes
Encrypted password support via crypt(3): yes
Built with multi-threading support.

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
              h2 : mode=HTTP       side=FE
       <default> : mode=HTX        side=FE|BE
       <default> : mode=TCP|HTTP   side=FE|BE

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

--
Best regards,
Maksim Kupriianov

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