Segfault: git show-branch --reflog refs/pullreqs/1

Hi all,

Does anyone see a segfault on `git show-branch --reflog refs/pullreqs/1`?

It seems files_reflog_path() creates a wrong path with the above command using REF_WORKTREE_SHARED.

refs/pullreqs is from GitHub if you have the following line in .git/config:

fetch = +refs/pull/*/head:refs/pullreqs/*

(gdb) bt
#0  __pthread_kill_implementation (threadid=<optimized out>,
signo=signo@entry=6, no_tid=no_tid@entry=0)
    at ./nptl/pthread_kill.c:44
#1  0x00007ffff7e101cf in __pthread_kill_internal (signo=6,
threadid=<optimized out>) at ./nptl/pthread_kill.c:78
#2  0x00007ffff7dc2472 in __GI_raise (sig=sig@entry=6) at
../sysdeps/posix/raise.c:26
#3  0x00007ffff7dac4b2 in __GI_abort () at ./stdlib/abort.c:79
#4  0x00007ffff7dad1ed in __libc_message (fmt=fmt@entry=0x7ffff7f1f78c
"%s\n") at ../sysdeps/posix/libc_fatal.c:150
#5  0x00007ffff7e19ae5 in malloc_printerr
(str=str@entry=0x7ffff7f1d22c "free(): invalid pointer") at
./malloc/malloc.c:5658
#6  0x00007ffff7e1b864 in _int_free (av=<optimized out>, p=<optimized
out>, have_lock=have_lock@entry=0) at ./malloc/malloc.c:4432
#7  0x00007ffff7e1e1df in __GI___libc_free (mem=<optimized out>) at
./malloc/malloc.c:3367
#8  0x0000555555625ae2 in cmd_show_branch (ac=<optimized out>,
av=<optimized out>, prefix=<optimized out>)
    at builtin/show-branch.c:801
#9  0x0000555555572250 in run_builtin (argv=0x7fffffffe080, argc=3,
p=0x5555558ca198 <commands+2712>) at git.c:469
#10 handle_builtin (argc=3, argv=0x7fffffffe080) at git.c:724
#11 0x00005555555731b4 in run_argv (argcp=argcp@entry=0x7fffffffde6c,
argv=argv@entry=0x7fffffffde60) at git.c:788
#12 0x0000555555573d38 in cmd_main (argc=<optimized out>,
argc@entry=4, argv=<optimized out>, argv@entry=0x7fffffffe078)
    at git.c:923
#13 0x0000555555571f10 in main (argc=4, argv=0x7fffffffe078) at common-main.c:62

Best,