Date: Mon, 1 Sep 2003 19:28:34 +0400 (MSD) From: Andrey Alekseyev <uitm@blackflag.ru> To: freebsd-hackers@freebsd.org Subject: ld-elf/libc problem? (was: php3/php4 problem) Message-ID: <200309011528.TAA00479@slt.oz>
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Hello,
Two months ago, after a thorough tracking of commits to STABLE, I've built
a 4.8-STABLE distribution. The distribution was built from sources cvsup'd
on Jul 06, 2003 and was targeted to be an upgrade package for a large
production site.
While the customer was testing this distribution, a serious compatibility
problem revealed. Namely, php3+php4 Apache dynamic modules combo stopped
working. Perfectly stable before, this configuration always caused Apache
to crash on 4.8-STABLE (Jul 06). Rebuilding Apache and php didn't help.
Even with the simpliest config, Apache always failed when php3 and php4 were
both enabled.
I spent long hours reading through commit logs since 4.6.2 and I found a
solution. It turns out that backing out the commits below and replacing
certain ld-elf and libc source files with the appropriate old versions
effectively solves php3+php4 dynamic modules configuration.
Frankly speaking, I'm extremely suprised just nobody noticed this problem.
All I could find were two postings from people in Germany. The customer
I worked for, contacted them only to find they had given up and thrown
their php3+php4 combo away.
Btw, this commit
"MFC: r1.69, support binaries with arbitrary number of PT_LOAD segments"
probably also needs suitable modifications to the kernel RLIMIT_VMEM mechanism.
Comments?
Old versions checkout list:
cvs co -r1.10.2.2 include/dlfcn.h
cvs co -r1.20.2.1 include/link.h
cvs co -r1.6 lib/libc/gen/dlfcn.c
cvs co -r1.43.2.11 libexec/rtld-elf/rtld.c
cvs co -r1.7 libexec/rtld-elf/map_object.c
cvs co -r1.3.2.2 libexec/rtld-elf/malloc.c
cvs co -r1.15.2.5 libexec/rtld-elf/rtld.h
cvs co -r1.73.2.12 sys/kern/imgact_elf.c
cvs co -r1.20.2.1 sys/sys/link_elf.h
cvs co -r1.16 sys/vm/vm.h
Commits backed out:
kan 2002/11/29 07:22:17 PST
Modified files: (Branch: RELENG_4)
libexec/rtld-elf rtld.c
Log:
MFC: r1.68 symbool lookup order change.
Revision Changes Path
1.43.2.12 +12 -12 src/libexec/rtld-elf/rtld.c
kan 2002/11/29 08:05:14 PST
Modified files: (Branch: RELENG_4)
libexec/rtld-elf map_object.c rtld.c
Log:
MFC: r1.69, support binaries with arbitrary number of PT_LOAD segments
Revision Changes Path
1.7.2.1 +57 -39 src/libexec/rtld-elf/map_object.c
1.43.2.13 +1 -5 src/libexec/rtld-elf/rtld.c
dillon 2002/12/28 11:49:41 PST
Modified files: (Branch: RELENG_4)
sys/vm vm.h
sys/kern imgact_elf.c
libexec/rtld-elf map_object.c
Log:
MFC ELF coredump handling fixes. Do not skip read-only pages unrelated
to the binary image. Use NOCORE to differentiate between the two.
Introduce a debug.elf_legacy_coredump sysctl which, if set, reverts to
the old behavior.
See the log message in sys/kern/imgact_elf.c 1.133.
PR: kern/45994
Revision Changes Path
1.7.2.2 +23 -6 src/libexec/rtld-elf/map_object.c
1.73.2.13 +31 -11 src/sys/kern/imgact_elf.c
1.16.2.1 +2 -1 src/sys/vm/vm.h
kan 2003/02/20 12:42:46 PST
Modified files: (Branch: RELENG_4)
include dlfcn.h link.h
lib/libc/gen dlfcn.c
libexec/rtld-elf malloc.c rtld.c rtld.h
sys/sys link_elf.h
Added files: (Branch: RELENG_4)
lib/libc/gen dlinfo.3
Log:
MFC: Properly remove unloaded objects from all lists.
Implement dlinfo function.
Aproved by: re (murray)
Revision Changes Path
1.10.2.3 +35 -1 src/include/dlfcn.h
1.20.2.2 +14 -3 src/include/link.h
1.6.2.1 +9 -1 src/lib/libc/gen/dlfcn.c
1.3.2.1 +266 -0 src/lib/libc/gen/dlinfo.3 (new)
1.3.2.3 +18 -1 src/libexec/rtld-elf/malloc.c
1.43.2.15 +288 -56 src/libexec/rtld-elf/rtld.c
1.15.2.6 +3 -3 src/libexec/rtld-elf/rtld.h
1.20.2.2 +14 -3 src/sys/sys/link_elf.h
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