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tg-libc_rwlock_recursive.diff
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> --- sysdeps/mach/libc-lock.h | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-) --- a/sysdeps/mach/libc-lock.h +++ b/sysdeps/mach/libc-lock.h @@ -151,15 +151,15 @@ typedef cthread_key_t __libc_key_t; __libc_lock_unlock_recursive (NAME) /* XXX for now */ -#define __libc_rwlock_define __libc_lock_define -#define __libc_rwlock_define_initialized __libc_lock_define_initialized -#define __libc_rwlock_init __libc_lock_init -#define __libc_rwlock_fini __libc_lock_fini -#define __libc_rwlock_rdlock __libc_lock_lock -#define __libc_rwlock_wrlock __libc_lock_lock -#define __libc_rwlock_tryrdlock __libc_lock_trylock -#define __libc_rwlock_trywrlock __libc_lock_trylock -#define __libc_rwlock_unlock __libc_lock_unlock +#define __libc_rwlock_define __libc_lock_define_recursive +#define __libc_rwlock_define_initialized __libc_lock_define_initialized_recursive +#define __libc_rwlock_init __libc_lock_init_recursive +#define __libc_rwlock_fini __libc_lock_fini_recursive +#define __libc_rwlock_rdlock __libc_lock_lock_recursive +#define __libc_rwlock_wrlock __libc_lock_lock_recursive +#define __libc_rwlock_tryrdlock __libc_lock_trylock_recursive +#define __libc_rwlock_trywrlock __libc_lock_trylock_recursive +#define __libc_rwlock_unlock __libc_lock_unlock_recursive struct __libc_cleanup_frame {