Dear Maintainer, tried to have a look and it seems that installwatch.so's initialize function was not yet called.
Attached are some details and a patch trying to call initialize just before the call to true_xstat64. Another patch would add a build-id to the shared object, so the build process can create a debug symbol package. Kind regards, Bernhard Location just before we end up with eip=0: (rr) reverse-stepi 0xb7edd1d8 in __xstat64 (version=<optimized out>, pathname=<optimized out>, info=<optimized out>) at installwatch.c:3731 3731 result=true_xstat64(version,pathname,info); 1: x/i $pc => 0xb7edd1d8 <__xstat64+88>: jmp *%eax (rr) print true_xstat64 $1 = (int (*)(int, const char *, struct stat64 *)) 0x0
Description: Force initialize for xstat64 Author: Bernhard Übelacker <bernha...@mailbox.org> Bug-Debian: https://bugs.debian.org/964458 Forwarded: no Last-Update: 2020-08-15 Index: checkinstall-1.6.2+git20170426.d24a630/installwatch/installwatch.c =================================================================== --- checkinstall-1.6.2+git20170426.d24a630.orig/installwatch/installwatch.c +++ checkinstall-1.6.2+git20170426.d24a630/installwatch/installwatch.c @@ -3728,6 +3728,8 @@ int __xstat64(int version,const char *pa /* We were asked to work in "real" mode */ if( !(__instw.gstatus & INSTW_INITIALIZED) || !(__instw.gstatus & INSTW_OKWRAP) ) { + if (!true_xstat64) + initialize(); result=true_xstat64(version,pathname,info); return result; }
Description: Add build-id to enable automatic generation of dbgsym package. Author: Bernhard Übelacker <bernha...@mailbox.org> Forwarded: no Last-Update: 2020-08-15 Index: checkinstall-1.6.2+git20170426.d24a630/installwatch/Makefile =================================================================== --- checkinstall-1.6.2+git20170426.d24a630.orig/installwatch/Makefile +++ checkinstall-1.6.2+git20170426.d24a630/installwatch/Makefile @@ -16,7 +16,7 @@ LIBDIR=$(PREFIX)/lib all: installwatch.so installwatch.so: installwatch.o - ld -znow -shared -o installwatch.so installwatch.o -ldl -lc + ld -znow -shared --build-id -o installwatch.so installwatch.o -ldl -lc installwatch.o: installwatch.c localdecls.h gcc $(CPPFLAGS) $(CFLAGS) $(LDFLAGS) -Wall -c -g -D_GNU_SOURCE -DPIC -fPIC -D_REENTRANT -DVERSION=\"$(VERSION)\" installwatch.c
# Unstable i386 qemu VM 2020-08-14 apt update apt dist-uprade apt install systemd-coredump gdb git fakeroot mc checkinstall libgnutls30-dbgsym apt build-dep libgnutls30 apt build-dep rr apt build-dep checkinstall echo 1 > /proc/sys/kernel/perf_event_paranoid mkdir /home/benutzer/source/libgnutls30/orig -p cd /home/benutzer/source/libgnutls30/orig apt source libgnutls30 cd # unfortunately no checkinstall-dbgsym package available ... mkdir /home/benutzer/source/checkinstall/orig -p cd /home/benutzer/source/checkinstall/orig apt source checkinstall cd cd /home/benutzer/source/checkinstall cp orig try1 -a cd try1/checkinstall-1.6.2+git20170426.d24a630/ DEB_BUILD_OPTIONS=nostrip dpkg-buildpackage dpkg -i /home/benutzer/source/checkinstall/try1/checkinstall_1.6.2+git20170426.d24a630-2_i386.deb ############ mkdir /home/benutzer/source/rr/git -p cd /home/benutzer/source/rr/git git clone https://github.com/mozilla/rr.git cd cd /home/benutzer/source/rr/git/rr/ mkdir obj && cd obj cmake ../rr make -j4 ############ touch CMakeLists.txt cmake . installwatch cmake . $ installwatch cmake . INFO : Using a default root directory : /tmp/tmp.2yZ1I6G54F /usr/bin/installwatch: Zeile 338: 3465 Speicherzugriffsfehler (Speicherabzug geschrieben) "$@" dmesg: [Sa Aug 15 01:32:54 2020] cmake[3465]: segfault at 0 ip 00000000 sp bfd2951c error 14 in cmake[4bf000+10000] [Sa Aug 15 01:32:54 2020] Code: Bad RIP value. root@debian:~# coredumpctl list TIME PID UID GID SIG COREFILE EXE Sat 2020-08-15 01:32:55 CEST 3465 1000 1000 11 present /usr/bin/cmake root@debian:~# coredumpctl gdb 3465 ... Core was generated by `cmake .'. Program terminated with signal SIGSEGV, Segmentation fault. #0 0x00000000 in ?? () (gdb) bt #0 0x00000000 in ?? () #1 0xb6a59c13 in ?? () from /usr/lib/i386-linux-gnu/libgnutls.so.30 #2 0xb6a6d535 in ?? () from /usr/lib/i386-linux-gnu/libgnutls.so.30 #3 0xb6a3f990 in ?? () from /usr/lib/i386-linux-gnu/libgnutls.so.30 #4 0xb7f3be9c in call_init (l=<optimized out>, argc=argc@entry=2, argv=argv@entry=0xbfd29694, env=0xbfd296a0) at dl-init.c:72 #5 0xb7f3bfa2 in call_init (env=0xbfd296a0, argv=0xbfd29694, argc=2, l=<optimized out>) at dl-init.c:30 #6 _dl_init (main_map=<optimized out>, argc=2, argv=0xbfd29694, env=0xbfd296a0) at dl-init.c:119 #7 0xb7f2c0fa in _dl_start_user () from /lib/ld-linux.so.2 (gdb) bt #0 0x00000000 in ?? () #1 0xb6a59c13 in stat64 (__statbuf=<optimized out>, __path=0xb6b572bb "/etc/gnutls/config") at /usr/include/i386-linux-gnu/sys/stat.h:455 #2 _gnutls_update_system_priorities () at ../../lib/priority.c:1309 #3 0xb6a6d535 in _gnutls_global_init (constructor=constructor@entry=1) at ../../lib/global.c:387 #4 0xb6a3f990 in lib_init () at ../../lib/global.c:511 #5 0xb7f3be9c in call_init (l=<optimized out>, argc=argc@entry=2, argv=argv@entry=0xbfd29694, env=0xbfd296a0) at dl-init.c:72 #6 0xb7f3bfa2 in call_init (env=0xbfd296a0, argv=0xbfd29694, argc=2, l=<optimized out>) at dl-init.c:30 #7 _dl_init (main_map=<optimized out>, argc=2, argv=0xbfd29694, env=0xbfd296a0) at dl-init.c:119 #8 0xb7f2c0fa in _dl_start_user () from /lib/ld-linux.so.2 (gdb) up #1 0xb6a59c13 in stat64 (__statbuf=<optimized out>, __path=0xb6b572bb "/etc/gnutls/config") at /usr/include/i386-linux-gnu/sys/stat.h:455 warning: Source file is more recent than executable. 455 return __xstat (_STAT_VER, __path, __statbuf); (gdb) print __path $1 = 0xb6b572bb "/etc/gnutls/config" (gdb) print __statbuf $2 = <optimized out> (gdb) list 450 /* Inlined versions of the real stat and mknod functions. */ 451 452 __extern_inline int 453 __NTH (stat (const char *__path, struct stat *__statbuf)) 454 { 455 return __xstat (_STAT_VER, __path, __statbuf); 456 } 457 458 # if defined __USE_MISC || defined __USE_XOPEN_EXTENDED 459 __extern_inline int (gdb) directory /home/benutzer/source/libgnutls30/orig/gnutls28-3.6.14/lib/includes Source directories searched: /home/benutzer/source/libgnutls30/orig/gnutls28-3.6.14/lib/includes:$cdir:$cwd (gdb) up #2 _gnutls_update_system_priorities () at ../../lib/priority.c:1309 1309 if (stat(system_priority_file, &sb) < 0) { (gdb) print system_priority_file $3 = 0xb6b572bb "/etc/gnutls/config" (gdb) print sb $4 = {st_dev = 13168605165528539074, __pad1 = 0, __st_ino = 2097734, st_mode = 582, st_nlink = 24, st_uid = 3066054816, st_gid = 3066055172, st_rdev = 13165550790959361556, __pad2 = 47744, st_size = 8461812105492824067, st_blksize = 1818588270, st_blocks = 155850206825, st_atim = {tv_sec = 38, tv_nsec = -1228906636}, st_mtim = {tv_sec = 1, tv_nsec = 0}, st_ctim = {tv_sec = -1228906636, tv_nsec = 1}, st_ino = 13168650293979643904} ############ benutzer@debian:~/test$ /home/benutzer/source/rr/git/obj/bin/rr installwatch cmake . rr: Saving execution to trace directory `/home/benutzer/.local/share/rr/installwatch-1'. INFO : Using a default root directory : /tmp/tmp.mzZzOVWo9S /usr/bin/installwatch: Zeile 338: 8117 Speicherzugriffsfehler (Speicherabzug geschrieben) "$@" benutzer@debian:~/test$ /home/benutzer/source/rr/git/obj/bin/rr ps /home/benutzer/.local/share/rr/installwatch-1 PID PPID EXIT CMD 8102 -- 1 installwatch cmake . 8103 8102 0 uname -m 8104 8102 0 basename /usr/bin/installwatch 8105 8102 0 getopt -a -n installwatch -o +r:e:o:d:v:tb -l root:,transl:,backup:,exclude:,logfile:,dbgfile:,dbglvl:,help,version,copyright -- cmake . 8106 8102 0 mktemp -q -d -p /tmp 8107 8102 0 (forked without exec) 8108 8107 0 (forked without exec) 8109 8107 0 sort -u 8110 8107 0 (forked without exec) 8111 8102 0 (forked without exec) 8112 8102 1 grep -qv ^/ 8113 8102 0 cat /dev/null 8114 8102 0 (forked without exec) 8115 8102 1 grep -qv ^/ 8116 8102 0 cat /dev/null 8117 8102 -11 cmake . /home/benutzer/source/rr/git/obj/bin/rr replay /home/benutzer/.local/share/rr/installwatch-1 -p 8117 directory /home/benutzer/source/libgnutls30/orig/gnutls28-3.6.14/lib/includes directory /home/benutzer/source/checkinstall/try1/checkinstall-1.6.2+git20170426.d24a630/installwatch set width 0 set pagination off display/i $pc cont reverse-stepi reverse-stepi benutzer@debian:~/test$ /home/benutzer/source/rr/git/obj/bin/rr replay /home/benutzer/.local/share/rr/installwatch-1 -p 8117 INFO : Using a default root directory : /tmp/tmp.mzZzOVWo9S GNU gdb (Debian 9.2-1) 9.2 Copyright (C) 2020 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 "i686-linux-gnu". Type "show configuration" for configuration details. For bug reporting instructions, please see: <http://www.gnu.org/software/gdb/bugs/>. Find the GDB manual and other documentation resources online at: <http://www.gnu.org/software/gdb/documentation/>. For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from /usr/bin/cmake... (No debugging symbols found in /usr/bin/cmake) Really redefine built-in command "restart"? (y or n) [answered Y; input not from terminal] Remote debugging using 127.0.0.1:8170 -------------------------------------------------- ---> Reached target process 8117 at event 3409. -------------------------------------------------- Reading symbols from /lib/ld-linux.so.2... Reading symbols from /usr/lib/debug/.build-id/c3/506778ae80f9d00e53b31eb690f8c0febb1d4a.debug... 0xb7ef20b0 in _start () from /lib/ld-linux.so.2 (rr) directory /home/benutzer/source/libgnutls30/orig/gnutls28-3.6.14/lib/includes Source directories searched: /home/benutzer/source/libgnutls30/orig/gnutls28-3.6.14/lib/includes:$cdir:$cwd (rr) directory /home/benutzer/source/checkinstall/try1/checkinstall-1.6.2+git20170426.d24a630/installwatch Source directories searched: /home/benutzer/source/checkinstall/try1/checkinstall-1.6.2+git20170426.d24a630/installwatch:/home/benutzer/source/libgnutls30/orig/gnutls28-3.6.14/lib/includes:$cdir:$cwd (rr) set width 0 (rr) set pagination off (rr) display/i $pc 1: x/i $pc => 0xb7ef20b0 <_start>: mov %esp,%eax (rr) cont Continuing. Program received signal SIGSEGV, Segmentation fault. 0x00000000 in ?? () 1: x/i $pc => 0x0: <error: Cannot access memory at address 0x0> (rr) reverse-stepi Program received signal SIGSEGV, Segmentation fault. 0x00000000 in ?? () 1: x/i $pc => 0x0: <error: Cannot access memory at address 0x0> (rr) reverse-stepi 0xb7edd1d8 in __xstat64 (version=<optimized out>, pathname=<optimized out>, info=<optimized out>) at installwatch.c:3731 warning: Source file is more recent than executable. 3731 result=true_xstat64(version,pathname,info); 1: x/i $pc => 0xb7edd1d8 <__xstat64+88>: jmp *%eax (rr) bt #0 0xb7edd1d8 in __xstat64 (version=<optimized out>, pathname=<optimized out>, info=<optimized out>) at installwatch.c:3731 #1 0xb6a0fc13 in stat64 (__statbuf=<optimized out>, __path=0xb6b0d2bb "/etc/gnutls/config") at /usr/include/i386-linux-gnu/sys/stat.h:455 #2 _gnutls_update_system_priorities () at ../../lib/priority.c:1309 #3 0xb6a23535 in _gnutls_global_init (constructor=constructor@entry=1) at ../../lib/global.c:387 #4 0xb69f5990 in lib_init () at ../../lib/global.c:511 #5 0xb7f01e9c in call_init (l=<optimized out>, argc=argc@entry=2, argv=argv@entry=0xbffa61e4, env=0xbffa61f0) at dl-init.c:72 #6 0xb7f01fa2 in call_init (env=0xbffa61f0, argv=0xbffa61e4, argc=2, l=<optimized out>) at dl-init.c:30 #7 _dl_init (main_map=<optimized out>, argc=2, argv=0xbffa61e4, env=0xbffa61f0) at dl-init.c:119 #8 0xb7ef20fa in _dl_start_user () from /lib/ld-linux.so.2 (rr) print true_xstat64 $1 = (int (*)(int, const char *, struct stat64 *)) 0x0 (rr) print &true_xstat64 $2 = (int (**)(int, const char *, struct stat64 *)) 0xb7eec064 <true_xstat64>
