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Re: [Libevent-users] select() call overflow from libevent for different OS

To: libevent-users@xxxxxxxxxxxxx
Subject: Re: [Libevent-users] select() call overflow from libevent for different OS
From: Nicholas Marriott <nicholas.marriott@xxxxxxxxx>
Date: Sun, 2 Jun 2013 12:05:03 +0100
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It is unlikely to be enough just to increase FD_SETSIZE in a header. You
will probably need to change other places and rebuild many things.

I recommend you don't try to do this and use poll() instead which is
designed to avoid this limitation and should work on all the platforms
you have mentioned (IIRC only Windows lacks it).


On Sun, Jun 02, 2013 at 01:47:05PM +0300, Roman Florea wrote:
> Hi Nicholas,
> 
> Thanks for your attention.
> 
> Did I understand that correctly that increasing the FD_SETSIZE should bring
> select() back to normal behaviour?
> 
> I tried setting it to 65535 from the typesizes.h and rechecked that
> from my code by printing __FD_SETSIZE and FD_SETSIZE, but still no
> luck to have 2000 idle connections to the server.
> 
> 
> Quoting Nicholas Marriott <nicholas.marriott@xxxxxxxxx>:
> 
> >Hi
> >
> >libevent uses the FD_* macros to manipulate the fd_set arguments. SUSv3
> >says regarding FD_SET and the other macros:
> >
> >"The behavior of these macros is undefined if the fd argument is less
> >than 0 or greater than or equal to FD_SETSIZE..."
> >
> >So it is acceptable for an implementation to crash your program.
> >
> >Even if you don't use the macros, select() itself may fail with EINVAL
> >if nfds > FD_SETSIZE.
> >
> >If you have more than FD_SETSIZE file descriptors and need to be
> >portable, you can't use select.
> >
> >
> >
> >On Sun, Jun 02, 2013 at 11:59:52AM +0300, Roman Florea wrote:
> >>Hello,
> >>
> >>while using libevent for some benchmarking tests I have encountered
> >>an issue that I cant tell if its a bug or a feature.
> >>
> >>The attempt to call select() on more than 1024 descriptors crashes
> >>on Ubuntu server and OpenSolaris with buffer overflow,
> >>while on Centos and FreeBSD it can hanlde them.
> >>
> >>I know select is not supposed to work with that amount of fd's but
> >>then why it does so selectively for some platforms.
> >>
> >>For the setup I use a slightly modified http-server code from
> >>libevent samples (modified with that it binds to a certain port,
> >>and has additional command line parameter to choose the event
> >>dispatch mechanism) and the client just spawns a requested number of
> >>idle
> >>open sockets to the server port, without transferring any data. The
> >>hardware is the same for all OS'es, and in all cases the OS is kept
> >>as
> >>default as possible (the limits on open files are set to be higher,
> >>no firewall and no selinux).
> >>
> >>So I wonder if libevent has to do anything with this, or is it OS feature?
> >>I tried to change the __FD_SETSIZE in
> >>/usr/include/x86_64-linux-gnu/bits/typesizes.h (the select.c seems
> >>to use this value)
> >>and recompile libevent and server code but with no effect.
> >>A comment in libevent's select.c shows that something similar was
> >>already there:
> >>#ifdef __APPLE__
> >>/* Apple wants us to define this if we might ever pass more than
> >> * FD_SETSIZE bits to select(). */
> >>#define _DARWIN_UNLIMITED_SELECT
> >>#endif
> >>Could it be used on platforms other than Apple?
> >>
> >>I would appreciate any opinion or explanation on that issue.
> >>
> >>Thank you.
> >>
> >>Kind Regards,
> >>Roman Florea.
> >>
> >>------- The output---
> >>
> >>
> >>Running on FreeBSD:  truss bin/httpserver /tmp -select
> >>...
> >>accept(5,{ AF_INET 130.230.141.41:5313 },0x7fffffffd82c) = 2003 (0x7d3)
> >>fcntl(2003,F_SETFD,FD_CLOEXEC)			 = 0 (0x0)
> >>fcntl(2003,F_SETFL,O_NONBLOCK)			 = 0 (0x0)
> >>accept(5,{ AF_INET 130.230.141.41:5314 },0x7fffffffd82c) = 2004 (0x7d4)
> >>fcntl(2004,F_SETFD,FD_CLOEXEC)			 = 0 (0x0)
> >>fcntl(2004,F_SETFL,O_NONBLOCK)			 = 0 (0x0)
> >>accept(5,{ AF_INET 130.230.141.41:5315 },0x7fffffffd82c) = 2005 (0x7d5)
> >>fcntl(2005,F_SETFD,FD_CLOEXEC)			 = 0 (0x0)
> >>fcntl(2005,F_SETFL,O_NONBLOCK)			 = 0 (0x0)
> >>accept(5,0x7fffffffd7a0,0x7fffffffd82c)		 ERR#35 'Resource
> >>temporarily unavailable'
> >>select(2006,{5 6 7 8 9 10 11 12 13 14 --CUT OUTPUT OF
> >>CONSECUTIVE FD NUMBERS--
> >>1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996
> >>1997 1998 1999 2000 2001 2002 2003 2004 2005},{},0x0,0x0) = 1 (0x1)
> >>clock_gettime(4,{5765029.847206292 })		 = 0 (0x0)
> >>gettimeofday({1370160860.074904 },0x0)		 = 0 (0x0)
> >>accept(5,{ AF_INET 130.230.141.45:34819 },0x7fffffffd82c) = 2006 (0x7d6)
> >>...
> >>
> >>
> >>The result on Ubuntu: strace bin/httpserver /tmp -select
> >>...
> >>accept4(5, 0x7fff87a677d0, [128], SOCK_CLOEXEC|SOCK_NONBLOCK) = -1
> >>EAGAIN (Resource temporarily unavailable)
> >>
> >>select(1023, [5 6 7 8 9 10 11 12 13 14 15 16 17 18 --CUT OUTPUT OF
> >>CONSECUTIVE FD NUMBERS-- 1019 1020 1021 1022], [], NULL, NULL) = 1
> >>(in [5])
> >>
> >>accept4(5, {sa_family=AF_INET, sin_port=htons(26236),
> >>sin_addr=inet_addr("192.168.141.41")}, [16],
> >>SOCK_CLOEXEC|SOCK_NONBLOCK) = 1023
> >>accept4(5, {sa_family=AF_INET, sin_port=htons(26237),
> >>sin_addr=inet_addr("192.168.141.41")}, [16],
> >>SOCK_CLOEXEC|SOCK_NONBLOCK) = 1024
> >>open("/dev/tty", O_RDWR|O_NOCTTY|O_NONBLOCK) = 1025
> >>
> >>writev(1025, [{"*** ", 4}, {"buffer overflow detected", 24}, {" ***:
> >>", 6}, {"bin/httpserver", 14}, {" terminated\n", 12}], 5*** buffer
> >>overflow detected ***: bin/httpserver terminated
> >>) = 60
> >>
> >>mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS,
> >>-1, 0) = 0x7f4ce5a06000
> >>open("/opt/tlt-bench/lib/libgcc_s.so.1", O_RDONLY|O_CLOEXEC) = -1
> >>ENOENT (No such file or directory)
> >>open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 1026
> >>fstat(1026, {st_mode=S_IFREG|0644, st_size=19195, ...}) = 0
> >>mmap(NULL, 19195, PROT_READ, MAP_PRIVATE, 1026, 0) = 0x7f4ce59fa000
> >>close(1026)                             = 0
> >>access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or
> >>directory)
> >>open("/lib/x86_64-linux-gnu/libgcc_s.so.1", O_RDONLY|O_CLOEXEC) = 1026
> >>read(1026,
> >>"\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\20*\0\0\0\0\0\0"...,
> >>832) = 832
> >>fstat(1026, {st_mode=S_IFREG|0644, st_size=88400, ...}) = 0
> >>mmap(NULL, 2184216, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE,
> >>1026, 0) = 0x7f4ce4b9f000
> >>mprotect(0x7f4ce4bb4000, 2093056, PROT_NONE) = 0
> >>mmap(0x7f4ce4db3000, 8192, PROT_READ|PROT_WRITE,
> >>MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 1026, 0x14000) = 0x7f4ce4db3000
> >>close(1026)                             = 0
> >>mprotect(0x7f4ce4db3000, 4096, PROT_READ) = 0
> >>munmap(0x7f4ce59fa000, 19195)           = 0
> >>futex(0x7f4ce5596e10, FUTEX_WAKE_PRIVATE, 2147483647) = 0
> >>futex(0x7f4ce4db41a4, FUTEX_WAKE_PRIVATE, 2147483647) = 0
> >>write(1025, "======= Backtrace: =========\n", 29======= Backtrace: =========
> >>) = 29
> >>writev(1025, [{"/lib/x86_64-linux-gnu/libc.so.6", 31}, {"(", 1},
> >>{"__fortify_fail", 14}, {"+0x", 3}, {"5c", 2}, {")", 1}, {"[0x", 3},
> >>{"7f4ce52e482c", 12}, {"]\n", 2}],
> >>9/lib/x86_64-linux-gnu/libc.so.6(__fortify_fail+0x5c)[0x7f4ce52e482c]
> >>) = 69
> >>writev(1025, [{"/lib/x86_64-linux-gnu/libc.so.6", 31}, {"(", 1},
> >>{"+0x", 3}, {"109700", 6}, {")", 1}, {"[0x", 3}, {"7f4ce52e3700",
> >>12}, {"]\n", 2}],
> >>8/lib/x86_64-linux-gnu/libc.so.6(+0x109700)[0x7f4ce52e3700]
> >>) = 59
> >>writev(1025, [{"/lib/x86_64-linux-gnu/libc.so.6", 31}, {"(", 1},
> >>{"+0x", 3}, {"10a7be", 6}, {")", 1}, {"[0x", 3}, {"7f4ce52e47be",
> >>12}, {"]\n", 2}],
> >>8/lib/x86_64-linux-gnu/libc.so.6(+0x10a7be)[0x7f4ce52e47be]
> >>) = 59
> >>writev(1025, [{"/opt/tlt-bench/lib/libevent-2.1."..., 36}, {"(", 1},
> >>{"+0x", 3}, {"27b0e", 5}, {")", 1}, {"[0x", 3}, {"7f4ce55c0b0e",
> >>12}, {"]\n", 2}],
> >>8/opt/tlt-bench/lib/libevent-2.1.so.3(+0x27b0e)[0x7f4ce55c0b0e]
> >>) = 63
> >>writev(1025, [{"/opt/tlt-bench/lib/libevent-2.1."..., 36}, {"(", 1},
> >>{"evmap_io_add_", 13}, {"+0x", 3}, {"1aa", 3}, {")", 1}, {"[0x", 3},
> >>{"7f4ce55bab9a", 12}, {"]\n", 2}], 9/opt/tlt-bench/lib/libevent-2.1.so.3(evmap_io_add_+0x1aa)[0x7f4ce55bab9a]
> >>) = 74
> >>writev(1025, [{"/opt/tlt-bench/lib/libevent-2.1."..., 36}, {"(", 1},
> >>{"event_add_nolock_", 17}, {"+0x", 3}, {"64e", 3}, {")", 1}, {"[0x",
> >>3}, {"7f4ce55b5fae", 12}, {"]\n", 2}], 9/opt/tlt-bench/lib/libevent-2.1.so.3(event_add_nolock_+0x64e)[0x7f4ce55b5fae]
> >>) = 78
> >>writev(1025, [{"/opt/tlt-bench/lib/libevent-2.1."..., 36}, {"(", 1},
> >>{"event_add", 9}, {"+0x", 3}, {"3a", 2}, {")", 1}, {"[0x", 3},
> >>{"7f4ce55b653a", 12}, {"]\n", 2}],
> >>9/opt/tlt-bench/lib/libevent-2.1.so.3(event_add+0x3a)[0x7f4ce55b653a]
> >>) = 69
> >>writev(1025, [{"/opt/tlt-bench/lib/libevent-2.1."..., 36}, {"(", 1},
> >>{"+0x", 3}, {"19213", 5}, {")", 1}, {"[0x", 3}, {"7f4ce55b2213",
> >>12}, {"]\n", 2}],
> >>8/opt/tlt-bench/lib/libevent-2.1.so.3(+0x19213)[0x7f4ce55b2213]
> >>) = 63
> >>writev(1025, [{"/opt/tlt-bench/lib/libevent-2.1."..., 36}, {"(", 1},
> >>{"bufferevent_enable", 18}, {"+0x", 3}, {"5d", 2}, {")", 1}, {"[0x",
> >>3}, {"7f4ce55adbcd", 12}, {"]\n", 2}], 9/opt/tlt-bench/lib/libevent-2.1.so.3(bufferevent_enable+0x5d)[0x7f4ce55adbcd]
> >>) = 78
> >>writev(1025, [{"/opt/tlt-bench/lib/libevent-2.1."..., 36}, {"(", 1},
> >>{"+0x", 3}, {"19144", 5}, {")", 1}, {"[0x", 3}, {"7f4ce55b2144",
> >>12}, {"]\n", 2}],
> >>8/opt/tlt-bench/lib/libevent-2.1.so.3(+0x19144)[0x7f4ce55b2144]
> >>) = 63
> >>writev(1025, [{"/opt/tlt-bench/lib/libevent-2.1."..., 36}, {"(", 1},
> >>{"bufferevent_setfd", 17}, {"+0x", 3}, {"3b", 2}, {")", 1}, {"[0x",
> >>3}, {"7f4ce55ae20b", 12}, {"]\n", 2}], 9/opt/tlt-bench/lib/libevent-2.1.so.3(bufferevent_setfd+0x3b)[0x7f4ce55ae20b]
> >>) = 77
> >>writev(1025, [{"/opt/tlt-bench/lib/libevent-2.1."..., 36}, {"(", 1},
> >>{"+0x", 3}, {"38c53", 5}, {")", 1}, {"[0x", 3}, {"7f4ce55d1c53",
> >>12}, {"]\n", 2}],
> >>8/opt/tlt-bench/lib/libevent-2.1.so.3(+0x38c53)[0x7f4ce55d1c53]
> >>) = 63
> >>writev(1025, [{"/opt/tlt-bench/lib/libevent-2.1."..., 36}, {"(", 1},
> >>{"+0x", 3}, {"267bf", 5}, {")", 1}, {"[0x", 3}, {"7f4ce55bf7bf",
> >>12}, {"]\n", 2}],
> >>8/opt/tlt-bench/lib/libevent-2.1.so.3(+0x267bf)[0x7f4ce55bf7bf]
> >>) = 63
> >>writev(1025, [{"/opt/tlt-bench/lib/libevent-2.1."..., 36}, {"(", 1},
> >>{"+0x", 3}, {"1db09", 5}, {")", 1}, {"[0x", 3}, {"7f4ce55b6b09",
> >>12}, {"]\n", 2}],
> >>8/opt/tlt-bench/lib/libevent-2.1.so.3(+0x1db09)[0x7f4ce55b6b09]
> >>) = 63
> >>writev(1025, [{"/opt/tlt-bench/lib/libevent-2.1."..., 36}, {"(", 1},
> >>{"event_base_loop", 15}, {"+0x", 3}, {"407", 3}, {")", 1}, {"[0x",
> >>3}, {"7f4ce55b73f7", 12}, {"]\n", 2}], 9/opt/tlt-bench/lib/libevent-2.1.so.3(event_base_loop+0x407)[0x7f4ce55b73f7]
> >>) = 76
> >>writev(1025, [{"bin/httpserver", 14}, {"[0x", 3}, {"4025d8", 6},
> >>{"]\n", 2}], 4bin/httpserver[0x4025d8]
> >>) = 25
> >>writev(1025, [{"/lib/x86_64-linux-gnu/libc.so.6", 31}, {"(", 1},
> >>{"__libc_start_main", 17}, {"+0x", 3}, {"ed", 2}, {")", 1}, {"[0x",
> >>3}, {"7f4ce51fb76d", 12}, {"]\n", 2}], 9/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xed)[0x7f4ce51fb76d]
> >>) = 72
> >>writev(1025, [{"bin/httpserver", 14}, {"[0x", 3}, {"4017a9", 6},
> >>{"]\n", 2}], 4bin/httpserver[0x4017a9]
> >>) = 25
> >>write(1025, "======= Memory map: ========\n", 29======= Memory map: ========
> >>) = 29
> >>open("/proc/self/maps", O_RDONLY)       = 1026
> >>read(1026, "00400000-00403000 r-xp 00000000 "..., 1024) = 1024
> >>write(1025, "00400000-00403000 r-xp 00000000 "...,
> >>102400400000-00403000 r-xp 00000000 fc:00 150666
> >>/opt/tlt-bench/bin/httpserver
> >>00602000-00603000 r--p 00002000 fc:00 150666
> >>/opt/tlt-bench/bin/httpserver
> >>00603000-00604000 rw-p 00003000 fc:00 150666
> >>/opt/tlt-bench/bin/httpserver
> >>00803000-009f2000 rw-p 00000000 00:00 0
> >>[heap]
> >>7f4ce4b9f000-7f4ce4bb4000 r-xp 00000000 fc:00 1010
> >>/lib/x86_64-linux-gnu/libgcc_s.so.1
> >>7f4ce4bb4000-7f4ce4db3000 ---p 00015000 fc:00 1010
> >>/lib/x86_64-linux-gnu/libgcc_s.so.1
> >>7f4ce4db3000-7f4ce4db4000 r--p 00014000 fc:00 1010
> >>/lib/x86_64-linux-gnu/libgcc_s.so.1
> >>7f4ce4db4000-7f4ce4db5000 rw-p 00015000 fc:00 1010
> >>/lib/x86_64-linux-gnu/libgcc_s.so.1
> >>7f4ce4db5000-7f4ce4dcd000 r-xp 00000000 fc:00 1059
> >>/lib/x86_64-linux-gnu/libpthread-2.15.so
> >>7f4ce4dcd000-7f4ce4fcc000 ---p 00018000 fc:00 1059
> >>/lib/x86_64-) = 1024
> >>read(1026, "linux-gnu/libpthread-2.15.so\n7f4"..., 1024) = 1024
> >>write(1025, "linux-gnu/libpthread-2.15.so\n7f4"...,
> >>1024linux-gnu/libpthread-2.15.so
> >>7f4ce4fcc000-7f4ce4fcd000 r--p 00017000 fc:00 1059
> >>/lib/x86_64-linux-gnu/libpthread-2.15.so
> >>7f4ce4fcd000-7f4ce4fce000 rw-p 00018000 fc:00 1059
> >>/lib/x86_64-linux-gnu/libpthread-2.15.so
> >>7f4ce4fce000-7f4ce4fd2000 rw-p 00000000 00:00 0
> >>7f4ce4fd2000-7f4ce4fd9000 r-xp 00000000 fc:00 1065
> >>/lib/x86_64-linux-gnu/librt-2.15.so
> >>7f4ce4fd9000-7f4ce51d8000 ---p 00007000 fc:00 1065
> >>/lib/x86_64-linux-gnu/librt-2.15.so
> >>7f4ce51d8000-7f4ce51d9000 r--p 00006000 fc:00 1065
> >>/lib/x86_64-linux-gnu/librt-2.15.so
> >>7f4ce51d9000-7f4ce51da000 rw-p 00007000 fc:00 1065
> >>/lib/x86_64-linux-gnu/librt-2.15.so
> >>7f4ce51da000-7f4ce538f000 r-xp 00000000 fc:00 990
> >>/lib/x86_64-linux-gnu/libc-2.15.so
> >>7f4ce538f000-7f4ce558e000 ---p 001b5000 fc:00 990
> >>/lib/x86_64-linux-gnu/libc-2.15.so
> >>7f4ce558e000-7f4ce5592000 r--p 001b4000 fc:00 990                 ) = 1024
> >>read(1026, "       /lib/x86_64-linux-gnu/lib"..., 1024) = 1024
> >>write(1025, "       /lib/x86_64-linux-gnu/lib"..., 1024
> >>/lib/x86_64-linux-gnu/libc-2.15.so
> >>7f4ce5592000-7f4ce5594000 rw-p 001b8000 fc:00 990
> >>/lib/x86_64-linux-gnu/libc-2.15.so
> >>7f4ce5594000-7f4ce5599000 rw-p 00000000 00:00 0
> >>7f4ce5599000-7f4ce55e5000 r-xp 00000000 fc:00 1276
> >>/opt/tlt-bench/lib/libevent-2.1.so.3.0.0
> >>7f4ce55e5000-7f4ce57e5000 ---p 0004c000 fc:00 1276
> >>/opt/tlt-bench/lib/libevent-2.1.so.3.0.0
> >>7f4ce57e5000-7f4ce57e6000 r--p 0004c000 fc:00 1276
> >>/opt/tlt-bench/lib/libevent-2.1.so.3.0.0
> >>7f4ce57e6000-7f4ce57e7000 rw-p 0004d000 fc:00 1276
> >>/opt/tlt-bench/lib/libevent-2.1.so.3.0.0
> >>7f4ce57e7000-7f4ce57e8000 rw-p 00000000 00:00 0
> >>7f4ce57e8000-7f4ce580a000 r-xp 00000000 fc:00 972
> >>/lib/x86_64-linux-gnu/ld-2.15.so
> >>7f4ce59ff000-7f4ce5a03000 rw-p 00000000 00:00 0
> >>7f4ce5a06000-7f4ce5a0a000 rw-p 00000000 00:00 0
> >>7f4ce5a0a000-7f4ce5a0b000 r--p 00022000 fc:00 972
> >>/lib/x86_64-linux-gnu/ld-2.15.so
> >>7f4ce5a0b0) = 1024
> >>read(1026, "00-7f4ce5a0d000 rw-p 00023000 fc"..., 1024) = 341
> >>write(1025, "00-7f4ce5a0d000 rw-p 00023000 fc"...,
> >>34100-7f4ce5a0d000 rw-p 00023000 fc:00 972
> >>/lib/x86_64-linux-gnu/ld-2.15.so
> >>7fff87a49000-7fff87a6a000 rw-p 00000000 00:00 0
> >>[stack]
> >>7fff87add000-7fff87ade000 r-xp 00000000 00:00 0
> >>[vdso]
> >>ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0
> >>[vsyscall]
> >>) = 341
> >>read(1026, "", 1024)                    = 0
> >>close(1026)                             = 0
> >>rt_sigprocmask(SIG_UNBLOCK, [ABRT], NULL, 8) = 0
> >>tgkill(31662, 31662, SIGABRT)           = 0
> >>--- SIGABRT (Aborted) @ 0 (0) ---
> >>+++ killed by SIGABRT (core dumped) +++
> >>Aborted (core dumped)
> >>
> >>
> >>
> >>
> >>***********************************************************************
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> >>unsubscribe libevent-users    in the body.
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> >
> 
> 
> 
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