Package: fakeroot
Version: 1.21-2
Severity: normal
Hello,
While investigating a hang with fakeroot on hurd-i386, I got the
following backtrace which is a concern for Linux too:
#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
What happens is that the fakeroot initialization gets triggered from an
__fxtstat64 call made by _nl_load_locale_from_archive. The issue is
that setlocale has locked __libc_setlocale_lock, and __dcigettext tries
to lock it again. On Linux, that just returns EDEADLK which is then
ignored. When __dcigettext unlocks __libc_setlocale_lock, it does get
unlocked, and execution can continue with _nl_load_locale_from_archive
doing its work with __libc_setlocale_lock unlocked, which is unsafe!
libfakeroot should not assume that the redirect calls it gets are made
in a context where anything can be done, and notably
load_library_symbols can't necessarily be done there, it should rather
be done from a library constructor or something like that.
Samuel
-- System Information:
Debian Release: stretch/sid
APT prefers testing
APT policy: (990, 'testing'), (500, 'unstable-debug'), (500,
'testing-debug'), (500, 'buildd-unstable'), (500, 'unstable'), (500, 'stable'),
(500, 'oldstable'), (1, 'experimental-debug'), (1, 'buildd-experimental'), (1,
'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386
Kernel: Linux 4.8.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
Versions of packages fakeroot depends on:
ii libc6 2.24-5
ii libfakeroot 1.21-2
fakeroot recommends no packages.
fakeroot suggests no packages.
-- no debconf information
--
Samuel
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