bug#38417: 26.3; crash when opening help for tramp-password-prompt-regexp

[Maximilian]

Whenever I try to describe-variable tramp-password-prompt-regexp, Emacs 
crashes (even with -q).

gdb bt full output:

Thread 1 "emacs" received signal SIGABRT, Aborted.
0x00007ffff59e67b5 in raise () from /usr/lib/libpthread.so.0
(gdb) bt full
#0  0x00007ffff59e67b5 in raise () at /usr/lib/libpthread.so.0
#1  0x00000000004f513e in  ()
#2  0x000000000050fc84 in  ()
#3  0x00000000005dc3bf in  ()
#4  0x00007ffff5bf04b4 in mflt_run () at /usr/lib/libm17n-flt.so.0
#5  0x00000000005ddcc0 in  ()
#6  0x00000000005e171f in  ()
#7  0x000000000057e86a in  ()
#8  0x000000000056d78d in  ()
#9  0x00000000005ac1d1 in  ()
#10 0x00000000005700c4 in  ()
#11 0x000000000056d70b in  ()
#12 0x000000000056ca93 in  ()
#13 0x000000000042c81e in  ()
#14 0x0000000000439172 in  ()
#15 0x00000000005cdb01 in  ()
#16 0x00000000005d1c40 in  ()
#17 0x000000000044534d in  ()
#18 0x0000000000443365 in  ()
#19 0x00000000004405a9 in  ()
#20 0x00000000004459ea in  ()
#21 0x000000000044efcb in  ()
#22 0x0000000000471874 in  ()
#23 0x000000000056d78d in  ()
#24 0x00000000005ac1d1 in  ()
#25 0x00000000005700c4 in  ()
#26 0x000000000056d70b in  ()
#27 0x00000000005ac1d1 in  ()
#28 0x00000000005700c4 in  ()
#29 0x000000000056d70b in  ()
#30 0x00000000005ac1d1 in  ()
#31 0x000000000056d70b in  ()
--Type <RET> for more, q to quit, c to continue without paging--
#32 0x00000000005ac1d1 in  ()
#33 0x000000000056d70b in  ()
#34 0x00000000005ac1d1 in  ()
#35 0x000000000056d70b in  ()
#36 0x00000000005ac1d1 in  ()
#37 0x000000000056d70b in  ()
#38 0x00000000005ac1d1 in  ()
#39 0x000000000056d70b in  ()
#40 0x000000000056a040 in  ()
#41 0x000000000056d78d in  ()
#42 0x000000000056f4dc in  ()
#43 0x000000000056a5d6 in  ()
#44 0x000000000056d78d in  ()
#45 0x00000000005ac1d1 in  ()
#46 0x000000000056d70b in  ()
#47 0x000000000056d84a in  ()
#48 0x0000000000504376 in  ()
#49 0x000000000056c8bf in  ()
#50 0x00000000004f5545 in  ()
#51 0x000000000056c82e in  ()
#52 0x00000000004f54dd in  ()
#53 0x00000000004fa728 in  ()
#54 0x00000000004faa68 in  ()
#55 0x0000000000415d04 in  ()
#56 0x00007ffff5721153 in __libc_start_main () at /usr/lib/libc.so.6
#57 0x0000000000416abe in  ()