https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104435
Bug ID: 104435
Summary: Infinite recursion in
rust_demangle(mangled="_RYAvB2_l", options=259)
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: demangler
Assignee: unassigned at gcc dot gnu.org
Reporter: teemperor at gmail dot com
Target Milestone: ---
Created attachment 52367
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52367&action=edit
POC
Calling rust_demangle with (mangled="_RYAvB2_l", options=259) results in
infinite recursion with the following backtrace (I truncated the repeating
frames):
```
frame #130956: 0x000055555573a139
objdump`demangle_const(rdm=0x00007fffffffd708) at rust-demangle.c:1158:11
frame #130957: 0x000055555573a139
objdump`demangle_const(rdm=0x00007fffffffd708) at rust-demangle.c:1158:11
frame #130958: 0x000055555573a139
objdump`demangle_const(rdm=0x00007fffffffd708) at rust-demangle.c:1158:11
frame #130959: 0x000055555573a139
objdump`demangle_const(rdm=0x00007fffffffd708) at rust-demangle.c:1158:11
frame #130960: 0x000055555573a139
objdump`demangle_const(rdm=0x00007fffffffd708) at rust-demangle.c:1158:11
frame #130961: 0x000055555573a139
objdump`demangle_const(rdm=0x00007fffffffd708) at rust-demangle.c:1158:11
frame #130962: 0x000055555573a139
objdump`demangle_const(rdm=0x00007fffffffd708) at rust-demangle.c:1158:11
frame #130963: 0x000055555573a139
objdump`demangle_const(rdm=0x00007fffffffd708) at rust-demangle.c:1158:11
frame #130964: 0x00005555557397c1
objdump`demangle_type(rdm=0x00007fffffffd708) at rust-demangle.c:938:11
frame #130965: 0x0000555555738e20
objdump`demangle_path(rdm=0x00007fffffffd708, in_value=1) at
rust-demangle.c:759:7
frame #130966: 0x0000555555737fba
objdump`rust_demangle_callback(mangled="_RYAvB2_l", options=259,
callback=(objdump`str_buf_demangle_callback at rust-demangle.c:1534),
opaque=0x00007fffffffd788) at rust-demangle.c:1438:7
frame #130967: 0x000055555573900f
objdump`rust_demangle(mangled="_RYAvB2_l", options=259) at
rust-demangle.c:1549:13
frame #130968: 0x0000555555722fd2
objdump`cplus_demangle(mangled="_RYAvB2_l", options=259) at cplus-dem.c:166:13
frame #130969: 0x000055555565291f
objdump`bfd_demangle(abfd=0x0000555555807bf0, name="_RYAvB2_l", options=3) at
bfd.c:2428:9
```
This is with objdump build from binutils-gdb at commit
2b1026f391d55070ae1e724c0770302d1c429611 . Side note: this is after commit
f10bec5ffa487ad3033ed5f38cfd0fc7d696deab that fixed the other rust demangler
infinite recursion (PR demangler/98886, PR demangler/99935). Searching bugzilla
hasn't turned up a similar backtrace, so I hope this isn't a dupe.
Can be reproduced via `objdump -C -D crashes_47.o`
