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From: Samuel Thibault <samuel.thibault@ens-lyon.org>
Subject: [PATCH] XXX: make libc_rwlock recursive
Without making the rwlocks recursive, running fakeroot-tcp gets this:
#0 0x0106e91c in mach_msg_trap () at /usr/src/glibc-2.24/build-tree/hurd-i386-libc/mach/mach_msg_trap.S:2
#1 0x0106f090 in __mach_msg (msg=0x20034a0, option=3, send_size=64, rcv_size=32, rcv_name=421, timeout=0, notify=0) at msg.c:110
#2 0x0125a241 in __gsync_wait (task=1, addr=19101080, val1=2, val2=0, msec=0, flags=0)
at /usr/src/glibc-2.24/build-tree/hurd-i386-libc/mach/RPC_gsync_wait.c:175
#3 0x010b0743 in __dcigettext (domainname=0x8050740 <_libc_intl_domainname@@GLIBC_2.2.6> "libc",
msgid1=0x8051d88 "undefined symbol: acl_get_fd", msgid2=0x0, plural=0, n=0, category=5) at dcigettext.c:527
#4 0x010af776 in __dcgettext (domainname=0x8050740 <_libc_intl_domainname@@GLIBC_2.2.6> "libc",
msgid=0x8051d88 "undefined symbol: acl_get_fd", category=5) at dcgettext.c:47
#5 0x0124e427 in __dlerror () at dlerror.c:94
#6 0x01035ae3 in load_library_symbols () from /usr/lib/i386-gnu/libfakeroot/libfakeroot-tcp.so
#7 0x01035cc3 in tmp___fxstat64 () from /usr/lib/i386-gnu/libfakeroot/libfakeroot-tcp.so
#8 0x01036cd6 in __fxstat64 () from /usr/lib/i386-gnu/libfakeroot/libfakeroot-tcp.so
#9 0x010ad831 in _nl_load_locale_from_archive (category=category@entry=0, namep=namep@entry=0x200399c) at loadarchive.c:211
#10 0x010ac45b in _nl_find_locale (locale_path=0x0, locale_path_len=0, category=category@entry=0, name=0x200399c) at findlocale.c:154
#11 0x010abde7 in setlocale (category=0, locale=0x804c2e4 "") at setlocale.c:417
#12 0x0804947f in main (argc=2, argv=0x2003ad4) at programs/locale.c:191
That's very unfortunate: libfakeroot gets initialized from a section
where __libc_setlocale_lock is already locked, and thus the dlerror()
call hangs inside __dcigettext. It happens that Linux doesn't have
the problem probably because pthread_rwlock_wrlock returns a EDEADLK
error instead of hanging, and then the first unlock unlocks, and the
second unlock probably returns an EINVAL. This is all very unsafe, but
that's fakeroot-tcp's matter (see http://bugs.debian.org/845930 for the
follow-up)...
We only use it when constructing the debian installer for -s -r options
anyway.
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
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