Date: Mon, 13 Aug 2012 18:59:51 +0200 From: Juergen Lock <nox@jelal.kn-bremen.de> To: Konstantin Belousov <kostikbel@gmail.com> Cc: current@freebsd.org, Juergen Lock <nox@jelal.kn-bremen.de>, freebsd-ports@freebsd.org, gljennjohn@googlemail.com Subject: Re: Segfault in rtld - dlopen RTLD_LAZY (was: Re: CFT: vlc 2.0.3 - want to know where it works and where only partly) Message-ID: <20120813165951.GA64229@triton8.kn-bremen.de> In-Reply-To: <20120813103047.GD2352@deviant.kiev.zoral.com.ua> References: <20120802205625.GA43980@triton8.kn-bremen.de> <20120803142711.1cb981b3@ernst.jennejohn.org> <501BE795.8070407@gwdg.de> <20120803163633.GA2046@triton8.kn-bremen.de> <20120804110952.4f3a9cfd@ernst.jennejohn.org> <201208051531.q75FVJjO087729@triton8.kn-bremen.de> <20120805161353.GF2676@deviant.kiev.zoral.com.ua> <20120805173811.GA91260@triton8.kn-bremen.de> <20120812231335.GA35313@triton8.kn-bremen.de> <20120813103047.GD2352@deviant.kiev.zoral.com.ua>
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On Mon, Aug 13, 2012 at 01:30:47PM +0300, Konstantin Belousov wrote: > On Mon, Aug 13, 2012 at 01:13:35AM +0200, Juergen Lock wrote: > > On Sun, Aug 05, 2012 at 07:38:11PM +0200, Juergen Lock wrote: > > > On Sun, Aug 05, 2012 at 07:13:53PM +0300, Konstantin Belousov wrote: > > > > On Sun, Aug 05, 2012 at 05:31:19PM +0200, Juergen Lock wrote: > > > > > Hi kib, -current, seems we have a segfault in rtld when updating > > > > > the multimedia/vlc port from the version currently in ports to the > > > > > 2.0.3 CFT version from here: > > > > > > > > > > http://people.freebsd.org/~nox/tmp/vlc-2.0.3-006.patch > > > > > > > > > > (If you test the LIVEMEDIA knob you also need this update: > > > > > > > > > > http://people.freebsd.org/~nox/tmp/livemedia-20120404-001.patch > > > > > > > > > > ) > > > > Please do two things. > > > > > > > > 1. Provide me the output of readelf -a for the module that was loaded. > > > > > > > > 2. Recompile rtld with debug symbols and redo the build to get the useful > > > > backtrace from core: > > > > cd /usr/src/libexec/rtld-elf > > > > make clean > > > > make all install DEBUG_FLAGS=-g > > > > > > > Ok, someone who got the crash will have to do this as I couln't > > > reproduce it here (sorry forgot to say...) > > > > > I just learned that the missing piece in reproducing this is the > > pulseaudio knob, now I finally have a bt: > > > > [...] > > Loaded symbols for /libexec/ld-elf.so.1 > > #0 symlook_obj (req=0x7fffffffbf40, obj=0x800640400) at /d3t/d3t/home/nox/src10b/src/libexec/rtld-elf/rtld.c:3847 > > 3847 for (symnum = obj->buckets[req->hash % obj->nbuckets]; > > [New Thread 802406400 (LWP 100159/vlc-cache-gen)] > > (gdb) bt > > #0 symlook_obj (req=0x7fffffffbf40, obj=0x800640400) at /d3t/d3t/home/nox/src10b/src/libexec/rtld-elf/rtld.c:3847 > > #1 0x0000000800608ae7 in symlook_list (req=0x7fffffffc120, objlist=Variable "objlist" is not available. > > ) at /d3t/d3t/home/nox/src10b/src/libexec/rtld-elf/rtld.c:3611 > > #2 0x000000080060911b in symlook_default (req=0x7fffffffc1c0, refobj=Variable "refobj" is not available. > > ) at /d3t/d3t/home/nox/src10b/src/libexec/rtld-elf/rtld.c:3569 > > #3 0x000000080060939d in find_symdef (symnum=15, refobj=0x8006fd000, defobj_out=0x7fffffffc260, flags=0, cache=0x80061d000, lockstate=0x7fffffffc300) > > at /d3t/d3t/home/nox/src10b/src/libexec/rtld-elf/rtld.c:1541 > > #4 0x0000000800603690 in reloc_non_plt (obj=0x8006fd000, obj_rtld=Variable "obj_rtld" is not available. > > ) at /d3t/d3t/home/nox/src10b/src/libexec/rtld-elf/amd64/reloc.c:204 > > #5 0x0000000800606ae8 in relocate_object (obj=0x8006fd000, bind_now=0 '\0', rtldobj=0x800819d00, flags=0, lockstate=0x7fffffffc300) > > at /d3t/d3t/home/nox/src10b/src/libexec/rtld-elf/rtld.c:2433 > > #6 0x00000008006084a8 in dlopen_object (name=0x80243ec80 "../modules/access/.libs/libpulsesrc_plugin.so", fd=Variable "fd" is not available. > > ) > > at /d3t/d3t/home/nox/src10b/src/libexec/rtld-elf/rtld.c:2392 > > #7 0x0000000800608f67 in rtld_dlopen (name=0x80243ec80 "../modules/access/.libs/libpulsesrc_plugin.so", fd=-1, mode=1) > > at /d3t/d3t/home/nox/src10b/src/libexec/rtld-elf/rtld.c:2761 > > #8 0x0000000800ad377d in vlc_timer_create () from /usr/ports/multimedia/vlc-203a/work/vlc-2.0.3/src/.libs/libvlccore.so.6 > > #9 0x0000000800ab9998 in module_gettext () from /usr/ports/multimedia/vlc-203a/work/vlc-2.0.3/src/.libs/libvlccore.so.6 > > #10 0x0000000800aba0aa in module_list_get () from /usr/ports/multimedia/vlc-203a/work/vlc-2.0.3/src/.libs/libvlccore.so.6 > > #11 0x0000000800ab9db1 in module_list_get () from /usr/ports/multimedia/vlc-203a/work/vlc-2.0.3/src/.libs/libvlccore.so.6 > > #12 0x0000000800ab9db1 in module_list_get () from /usr/ports/multimedia/vlc-203a/work/vlc-2.0.3/src/.libs/libvlccore.so.6 > > #13 0x0000000800aba17d in module_list_get () from /usr/ports/multimedia/vlc-203a/work/vlc-2.0.3/src/.libs/libvlccore.so.6 > > #14 0x0000000800aba631 in module_list_get () from /usr/ports/multimedia/vlc-203a/work/vlc-2.0.3/src/.libs/libvlccore.so.6 > > #15 0x0000000800a52573 in libvlc_InternalInit () from /usr/ports/multimedia/vlc-203a/work/vlc-2.0.3/src/.libs/libvlccore.so.6 > > #16 0x00000008008227a7 in libvlc_new () from /usr/ports/multimedia/vlc-203a/work/vlc-2.0.3/lib/.libs/libvlc.so.8 > > #17 0x0000000000400cd4 in main () > > (gdb) p obj->buckets > > $1 = (const Elf_Hashelt *) 0x804de0160 > > (gdb) p req->hash % obj->nbuckets > > $2 = 399 > > (gdb) p obj->buckets[req->hash % obj->nbuckets] > > Cannot access memory at address 0x804de079c > > (gdb) p obj->nbuckets > > $3 = 521 > Can you show the output of "p *obj" there ? Here it comes... #0 symlook_obj (req=0x7fffffffbf40, obj=0x800640400) at /d3t/d3t/home/nox/src10b/src/libexec/rtld-elf/rtld.c:3847 3847 for (symnum = obj->buckets[req->hash % obj->nbuckets]; [New Thread 802406400 (LWP 100159/vlc-cache-gen)] (gdb) p *obj $1 = {magic = 3578837114, version = 1, next = 0x80063f800, path = 0x8006434c0 "/usr/local/lib/libgconf-2.so.4", origin_path = 0x0, refcount = 1, dl_refcount = 0, mapbase = 0x804de0000 <Address 0x804de0000 out of bounds>, mapsize = 2342912, textsize = 229376, vaddrbase = 0, relocbase = 0x804de0000 <Address 0x804de0000 out of bounds>, dynamic = 0x805018620, entry = 0x804df14b0 <Address 0x804df14b0 out of bounds>, phdr = 0x804de0040, phsize = 280, interp = 0x0, stack_flags = 6, tlsindex = 0, tlsinit = 0x0, tlsinitsize = 0, tlssize = 0, tlsoffset = 0, tlsalign = 0, relro_page = 0x804de0000 <Address 0x804de0000 out of bounds>, relro_size = 0, pltgot = 0x805018ad8, rel = 0x0, relsize = 0, rela = 0x804de9040, relasize = 17256, pltrel = 0x0, pltrelsize = 0, pltrela = 0x804ded3a8, pltrelasize = 9960, symtab = 0x804de13d0, strtab = 0x804de5180 <Address 0x804de5180 out of bounds>, strsize = 14680, verneed = 0x804de9000, verneednum = 2, verdef = 0x0, verdefnum = 0, versyms = 0x804de8ad8, buckets = 0x804de0160, nbuckets = 521, chains = 0x804de0984, nchains = 658, nbuckets_gnu = 0, symndx_gnu = 0, maskwords_bm_gnu = 0, shift2_gnu = 0, dynsymcount = 658, bloom_gnu = 0x0, buckets_gnu = 0x0, chain_zero_gnu = 0x0, rpath = 0x804de8ac0 <Address 0x804de8ac0 out of bounds>, runpath = 0x0, needed = 0x0, needed_filtees = 0x0, needed_aux_filtees = 0x0, names = { stqh_first = 0x0, stqh_last = 0x8006405c0}, vertab = 0x80061e480, vernum = 4, init = 34441460368, fini = 34441575208, preinit_array = 0, init_array = 0, fini_array = 0, preinit_array_num = 0, init_array_num = 0, fini_array_num = 0, osrel = 0, mainprog = 0 '\0', rtld = 0 '\0', relocated = 1 '\001', ver_checked = 1 '\001', textrel = 0 '\0', symbolic = 0 '\0', bind_now = 0 '\0', traced = 0 '\0', jmpslots_done = 0 '\0', init_done = 1 '\001', tls_done = 0 '\0', phdr_alloc = 0 '\0', z_origin = 0 '\0', z_nodelete = 0 '\0', z_noopen = 0 '\0', z_loadfltr = 0 '\0', z_nodeflib = 0 '\0', ref_nodel = 0 '\0', init_scanned = 0 '\0', on_fini_list = 1 '\001', dag_inited = 0 '\0', filtees_loaded = 0 '\0', irelative = 0 '\0', gnu_ifunc = 0 '\0', crt_no_init = 0 '\0', valid_hash_sysv = 1 '\001', valid_hash_gnu = 0 '\0', linkmap = { l_addr = 0x804de0000 <Address 0x804de0000 out of bounds>, l_name = 0x8006434c0 "/usr/local/lib/libgconf-2.so.4", l_ld = 0x805018620, l_next = 0x80063fa20, l_prev = 0x800645620}, dldags = { stqh_first = 0x800701c80, stqh_last = 0x800701c80}, dagmembers = { stqh_first = 0x0, stqh_last = 0x800640658}, dev = 160, ino = 2042032, priv = 0x0} (gdb) Thanx! :) Juergen
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