bug#46829: Fresh install of 1.2.0 can't guix pull

[Leo Famulari <leo@famulari.name>]

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On Tue, Apr 13, 2021 at 10:12:13AM +0200, Ludovic Courtès wrote:
> Could you type ‘bt’ (backtrace) at the GDB prompt?

It goes like this:

------
Using host libthread_db library "/gnu/store/fa6wj5bxkj5ll1d7292a70knmyl7a0cr-glibc-2.31/lib/libthread_db.so.1".
Core was generated by `/gnu/store/66xwl53f9ws7gin8iaqkhg111gimw1li-profile/bin/guile ./build-aux/updat'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x0000000000000000 in ?? ()
[Current thread is 1 (Thread 0x7eff7d8cdb80 (LWP 70404))]
(gdb) bt
#0  0x0000000000000000 in ?? ()
#1  0x00007eff61d9d4c4 in git_buf_try_grow () from /gnu/store/2rwa9h8w3ha0hj3zkbnrq1p2z199s2hn-libgit2-1.1.0/lib/libgit2.so
#2  0x00007eff61d9d7a5 in git_buf_set () from /gnu/store/2rwa9h8w3ha0hj3zkbnrq1p2z199s2hn-libgit2-1.1.0/lib/libgit2.so
#3  0x00007eff61deffe7 in git_path_prettify () from /gnu/store/2rwa9h8w3ha0hj3zkbnrq1p2z199s2hn-libgit2-1.1.0/lib/libgit2.so
#4  0x00007eff61e043ad in find_repo () from /gnu/store/2rwa9h8w3ha0hj3zkbnrq1p2z199s2hn-libgit2-1.1.0/lib/libgit2.so
#5  0x00007eff61e0528b in git_repository_discover () from /gnu/store/2rwa9h8w3ha0hj3zkbnrq1p2z199s2hn-libgit2-1.1.0/lib/libgit2.so
#6  0x00007eff7de6166d in ffi_call_unix64 () from /gnu/store/bw15z9kh9c65ycc2vbhl2izwfwfva7p1-libffi-3.3/lib/libffi.so.7
#7  0x00007eff7de5fac0 in ffi_call_int () from /gnu/store/bw15z9kh9c65ycc2vbhl2izwfwfva7p1-libffi-3.3/lib/libffi.so.7
#8  0x00007eff7df4efbe in scm_i_foreign_call () from /gnu/store/m5iprcg6pb5ch86r9agmqwd8v6kp7999-guile-3.0.5/lib/libguile-3.0.so.1
#9  0x00007eff7dfbd904 in foreign_call () from /gnu/store/m5iprcg6pb5ch86r9agmqwd8v6kp7999-guile-3.0.5/lib/libguile-3.0.so.1
#10 0x00007eff7dfc4118 in vm_regular_engine () from /gnu/store/m5iprcg6pb5ch86r9agmqwd8v6kp7999-guile-3.0.5/lib/libguile-3.0.so.1
#11 0x00007eff7dfc55b5 in scm_call_n () from /gnu/store/m5iprcg6pb5ch86r9agmqwd8v6kp7999-guile-3.0.5/lib/libguile-3.0.so.1
#12 0x00007eff7df42d27 in scm_primitive_eval () from /gnu/store/m5iprcg6pb5ch86r9agmqwd8v6kp7999-guile-3.0.5/lib/libguile-3.0.so.1
#13 0x00007eff7df42d83 in scm_eval () from /gnu/store/m5iprcg6pb5ch86r9agmqwd8v6kp7999-guile-3.0.5/lib/libguile-3.0.so.1
#14 0x00007eff7df9b830 in scm_shell () from /gnu/store/m5iprcg6pb5ch86r9agmqwd8v6kp7999-guile-3.0.5/lib/libguile-3.0.so.1
#15 0x00007eff7df5a73d in invoke_main_func () from /gnu/store/m5iprcg6pb5ch86r9agmqwd8v6kp7999-guile-3.0.5/lib/libguile-3.0.so.1
#16 0x00007eff7df3cb0a in c_body () from /gnu/store/m5iprcg6pb5ch86r9agmqwd8v6kp7999-guile-3.0.5/lib/libguile-3.0.so.1
#17 0x00007eff7dfc4149 in vm_regular_engine () from /gnu/store/m5iprcg6pb5ch86r9agmqwd8v6kp7999-guile-3.0.5/lib/libguile-3.0.so.1
#18 0x00007eff7dfc55b5 in scm_call_n () from /gnu/store/m5iprcg6pb5ch86r9agmqwd8v6kp7999-guile-3.0.5/lib/libguile-3.0.so.1
#19 0x00007eff7df41bba in scm_call_2 () from /gnu/store/m5iprcg6pb5ch86r9agmqwd8v6kp7999-guile-3.0.5/lib/libguile-3.0.so.1
#20 0x00007eff7df433ba in scm_c_with_exception_handler () from /gnu/store/m5iprcg6pb5ch86r9agmqwd8v6kp7999-guile-3.0.5/lib/libguile-3.0.so.1
#21 0x00007eff7dfbac3d in scm_c_catch () from /gnu/store/m5iprcg6pb5ch86r9agmqwd8v6kp7999-guile-3.0.5/lib/libguile-3.0.so.1
#22 0x00007eff7df3d0b3 in scm_i_with_continuation_barrier () from /gnu/store/m5iprcg6pb5ch86r9agmqwd8v6kp7999-guile-3.0.5/lib/libguile-3.0.so.1
#23 0x00007eff7df3d145 in scm_c_with_continuation_barrier () from /gnu/store/m5iprcg6pb5ch86r9agmqwd8v6kp7999-guile-3.0.5/lib/libguile-3.0.so.1
#24 0x00007eff7dfb96df in with_guile () from /gnu/store/m5iprcg6pb5ch86r9agmqwd8v6kp7999-guile-3.0.5/lib/libguile-3.0.so.1
#25 0x00007eff7de97c78 in GC_call_with_stack_base () from /gnu/store/zg126cjicrpm2p6zc08ra5vh4ddag7ww-libgc-8.0.4/lib/libgc.so.1
#26 0x00007eff7dfb99f8 in scm_with_guile () from /gnu/store/m5iprcg6pb5ch86r9agmqwd8v6kp7999-guile-3.0.5/lib/libguile-3.0.so.1
#27 0x00007eff7df5a8b2 in scm_boot_guile () from /gnu/store/m5iprcg6pb5ch86r9agmqwd8v6kp7999-guile-3.0.5/lib/libguile-3.0.so.1
#28 0x0000000000401100 in main ()
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By the way, I can no longer reproduce the crash, now that I am using
`make update-guix-package` with a commit that has been pushed to
Savannah.

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