gnome-calculator crashed with SIGABRT in mpfr_assert_fail → mpfr_init2 → mpc_init3 → mpc_pow_usi_naive → mpc_pow_usi

[fcole90]

I cannot launch gnome-calculator because of the following:

```
../../src/init2.c:52: MPFR assertion failed: p >= 2 && p <= ((mpfr_prec_t)((mpfr_uprec_t)(~(mpfr_uprec_t)0)>>1))
Aborted (core dumped)
```

errors.u.c:
https://errors.ubuntu.com/problem/40a6712b7f663d518c85d34a30891ff7629f9041

ProblemType: Crash
DistroRelease: Ubuntu 18.04
Package: gnome-calculator 1:3.26.0-0ubuntu1
ProcVersionSignature: Ubuntu 4.14.0-13.15-generic 4.14.7
Uname: Linux 4.14.0-13-generic x86_64
ApportVersion: 2.20.8-0ubuntu6
Architecture: amd64
CurrentDesktop: GNOME
Date: Wed Jan 24 19:13:49 2018
ExecutablePath: /usr/bin/gnome-calculator
InstallationDate: Installed on 2017-08-21 (156 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170820)
ProcCmdline: gnome-calculator
Signal: 6
SourcePackage: gnome-calculator
StacktraceTop:
 mpfr_assert_fail () at /usr/lib/x86_64-linux-gnu/libmpfr.so.4
 mpfr_init2 () at /usr/lib/x86_64-linux-gnu/libmpfr.so.4
 () at /usr/lib/x86_64-linux-gnu/libmpc.so.3
 mpc_pow_usi () at /usr/lib/x86_64-linux-gnu/libmpc.so.3
 number_xpowy_integer () at /usr/lib/x86_64-linux-gnu/gnome-calculator/libcalculator.so
Title: gnome-calculator crashed with SIGABRT in mpfr_assert_fail()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

[Apport retracing service (apport)]

StacktraceTop:
 mpfr_assert_fail (filename=filename@entry=0x7fe4f8b5d6b0 "../../src/init2.c", linenum=linenum@entry=52, expr=expr@entry=0x7fe4f8b5d098 "p >= 2 && p <= ((mpfr_prec_t)((mpfr_uprec_t)(~(mpfr_uprec_t)0)>>1))") at ../../src/mpfr-gmp.c:305
 mpfr_init2 (x=x@entry=0x7fffef865540, p=p@entry=1) at ../../src/init2.c:52
 mpc_init3 (x=x@entry=0x7fffef865520, prec_re=prec_re@entry=64, prec_im=prec_im@entry=1) at init3.c:27
 mpc_pow_usi_naive (z=z@entry=0x55f8ffbc8400, x=x@entry=0x55f8ffbc8460, y=y@entry=3, sign=sign@entry=-1, rnd=rnd@entry=0) at pow_ui.c:31
 mpc_pow_usi (z=0x55f8ffbc8400, x=0x55f8ffbc8460, y=3, sign=-1, rnd=0) at pow_ui.c:77

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Jean-Baptiste Lallement (jibel)]

Thanks for your report.

I noticed that you're using libmpc3 1.1.0-1 from bionic-proposed. Could you revert to the version in bionic to check if it fixes your issue?

Thanks.

[Jean-Baptiste Lallement (jibel)]

confirmed by installating libmpc3 1.1.0-1 from bionic-proposed;

[Jean-Baptiste Lallement (jibel)]

This is because the precision is set to 1 in libmpfr 4.0.0 (in bionic-proposed) and 2 in libmpfr 3.1.6

mpfr4-4.0.0/src/mpfr.h:#define MPFR_PREC_MIN 1
mpfr4-3.1.6/src/mpfr.h:#define MPFR_PREC_MIN 2

Please downgrade to the versions in bionic until the publication of all the dependent packages in proposed is done.

[Raghavan Santhanam (geekie12)]

Hello,

I encountered this abort/crash with gnome-calculator and finally got rid of it as under.

I manually built and installed the latest mpfr/mpfc/gmp source code and binaries for
building gcc-7.3 which turned out to be extremely frustrating and energy-draining.
So, after installing those hand-built mpfr/mpfc/gmp binaries, I happened to launch the calculator(gnome-calculator) from the quick launch side-bar(yes, I still have Unity on
17.10!) and its icon was animating as usual for few seconds and nothing was happening
after that. So, I tried to launch it from terminal - it showed the abort/crash error
that this bug reports :
"../../src/init2.c:52: MPFR assertion failed: p >= 2 && p <= ((mpfr_prec_t)((mpfr_uprec_t)(~(mpfr_uprec_t)0)>>1))".

After searching for the above error, I stumbled upon this bug report, and I tried to
downgrade back to the default Ubuntu-repo version via "apt install" - that didn't solve
the issue. I tried to build and install mpfr-4.0.0 version - didn't change the crash behavior.
Tried building and installing mpfr-3.1.6/5 - didn't work. Manually removed the installed
libraries(libmpfr*) from /usr/lib/* and /usr/local/lib/* and redid the installation - both
"apt install" and build-install method from source for the reported mpfr-3.1.6 - didn't help.
I had also tried to modify mpfr-4.0.1's source code to use precision 2 instead of 1 and also
bunch of the other assert-macros logic for disabling the assertion(abort) - didn't help.

Downgraded mpc* as well as gmp* to older versions by building from their sources and installing
them - didn't help.

So, basically, I tried to put my system back to the previous state before I started meddling
with the mpfr/gmp/mpc all for building gcc-7.3 from its source - huge cost paid!

Tried the extreme cases out though not relevant as I could already figure out but did them
anyway to get back the "calculator" : reinstalled the kernel(I know kernel has nothing
to do with mpfr!), rebooted the PC, and so on - didn't help.

Finally, I paid close attention to the error stating that this assertion was from "init2.c:52",
so I located this 52nd source code line inside mpfr-3.1.6/src/init2.c and *disabled* the
assertion by commenting it out as my last attempt to get back the system to successfully
launch gnome-calculator, rebuilt and installed it - boom! I got the gnome-calculator back.
Below is what I commented out. I thought this was not necessary as MPFR_PREC_MIN was already 2
and not 1 as mentioned here in this proposed bug report/fix. Anyway.

<snip>
  /* p=1 is not allowed since the rounding to nearest even rule requires at
     least two bits of mantissa: the neighbours of 3/2 are 1*2^0 and 1*2^1,
     which both have an odd mantissa */
  //MPFR_ASSERTN(p >= MPFR_PREC_MIN && p <= MPFR_PREC_MAX);
</snip>

I confirmed that MPFR_PREC_MIN was 2 as told in here in this bug report and not 1 as in 4.0.1.
But, even then the above assertion was failing causing abort/crash for gnome-calculator.
Below is what I have in mpfr-3.1.6/src/mpfr.h(unchanged).

<snip>
/* Definition of precision limits without needing <limits.h> */
/* Note: the casts allows the expression to yield the wanted behavior
   for _M...

[Raghavan Santhanam (geekie12)]

<< reposting my previous comment in the aligned format as there seems to
be no option to edit it >>

Hello,

I encountered this abort/crash with gnome-calculator and finally got rid
of it as under.

I manually built and installed the latest mpfr/mpfc/gmp source code and
binaries for building gcc-7.3 which turned out to be extremely
frustrating and energy-draining. So, after installing those hand-built
mpfr/mpfc/gmp binaries, I happened to launch the calculator(gnome-
calculator) from the quick launch side-bar(yes, I still have Unity on
17.10!) and its icon was animating as usual for few seconds and nothing
was happening after that. So, I tried to launch it from terminal - it
showed the abort/crash error that this bug reports :
"../../src/init2.c:52: MPFR assertion failed: p >= 2 && p <= ((mpfr_prec_t)((mpfr_uprec_t)(~(mpfr_uprec_t)0)>>1))".

After searching for the above error, I stumbled upon this bug report, and
I tried to downgrade back to the default Ubuntu-repo version via "apt
install" - that didn't solve the issue. I tried to build and install
mpfr-4.0.0 version - didn't change the crash behavior.

Tried building and installing mpfr-3.1.6/5 - didn't work. Manually
removed the installed libraries(libmpfr*) from /usr/lib/* and /usr/local
/lib/* and redid the installation - both "apt install" and build-install
method from source for the reported mpfr-3.1.6 - didn't help. I had also
tried to modify mpfr-4.0.1's source code to use precision 2 instead of 1
and also bunch of the other assert-macros logic for disabling the
assertion(abort) - didn't help.

Downgraded mpc* as well as gmp* to older versions by building from their
sources and installing them - didn't help.

So, basically, I tried to put my system back to the previous state before
I started meddling with the mpfr/gmp/mpc all for building gcc-7.3 from
its source - huge cost paid!

Tried the extreme cases out though not relevant as I could already figure
out but did them anyway to get back the "calculator" : reinstalled the
kernel(I know kernel has nothing to do with mpfr!), rebooted the PC, and
so on - didn't help.

Finally, I paid close attention to the error stating that this assertion
was from "init2.c:52", so I located this 52nd source code line inside
mpfr-3.1.6/src/init2.c and *disabled* the assertion by commenting it out
as my last attempt to get back the system to successfully launch gnome
-calculator, rebuilt and installed it - boom! I got the gnome-calculator
back.

Below is what I commented out. I thought this was not necessary as
MPFR_PREC_MIN was already 2 and not 1 as mentioned here in this proposed
bug report/fix. Anyway.

<snip>
  /* p=1 is not allowed since the rounding to nearest even rule requires at
     least two bits of mantissa: the neighbours of 3/2 are 1*2^0 and 1*2^1,
     which both have an odd mantissa */
  //MPFR_ASSERTN(p >= MPFR_PREC_MIN && p <= MPFR_PREC_MAX);
</snip>

I confirmed that MPFR_PREC_MIN was 2 as told in here in this bug report
and not 1 as in 4.0.1. But, even then the above assertion was failing
causing abort/crash for gnome-calculator. Below is what I have in
mpfr-3.1.6/src/mpfr.h(unchanged).

<snip>
/* Definition of precision limits wi...

[Sebastien Bacher (seb128)]

There are no report from 3.28 or newer, seems to be resolved