Package: libmpfr6
Version: 4.1.0-3
Severity: normal
X-Debbugs-Cc:
I was fooling around with Arb and it seems that this program causes
an assertion failure in MPFR, although ASan and UBSan don't point to
any misusage by Arb. (Curiously if you change the numerical string
from "0" to "0.5" then Arb does segfault outright, but I think that's
unrelated.)
One can build the program below with -lflint-arb to link:
#include <arb.h>
#include <stdlib.h>
int main(void) {
arb_t x;
arb_init(x);
if(arb_set_str(x, "0", WORD_MAX)) {
exit(EXIT_FAILURE);
} else {
arb_printd(x, WORD_MAX);
arb_clear(x);
}
}
and this causes
../../src/init2.c:52: MPFR assertion failed: ((p) >= 1 && (p) <= ((mpfr_prec_t)
((((mpfr_uprec_t) -1) >> 1) - 256)))
Aborted
It seems this is related to the WORD_MAX limit in arb_printd(). Replacing
it with WORD_MAX/8 one gets (in GMP)
GNU MP: Cannot allocate memory (size=479903576292600072)
Aborted
-- System Information:
Debian Release: bullseye/sid
APT prefers testing
APT policy: (500, 'testing'), (2, 'unstable'), (1, 'testing-debug'), (1,
'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386
Kernel: Linux 5.9.0-1-amd64 (SMP w/2 CPU threads)
Kernel taint flags: TAINT_USER, TAINT_FIRMWARE_WORKAROUND
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
Versions of packages libmpfr6 depends on:
ii libc6 2.31-4
ii libgmp10 2:6.2.0+dfsg-6
libmpfr6 recommends no packages.
libmpfr6 suggests no packages.
-- no debconf information
