Public bug reported:
There is a bug in libunwind in both 18.04 and 20.04 on arm64 where when
linked with libunwind instead of catching an exception, the program
crashes. This was first seen on mcrouter, but attached is a small
reproducer where `main_unwind` will crash. The libunwind shipping with
22.04 doesn't appear to have this problem, nor do unmodified upstream
versions (including the 1.2.1 which is the 18.04 and 20.04 version).
Attached is a small reproducer that demonstrates the problem.
Ubuntu 22.04:
```
$ ./main
int throws lib
int caught main
$ ./main_unwind
int throws lib
int caught main
```
Ubuntu 20.04:
```
$ ./main
int throws lib
int caught main
$ ./main_unwind
terminate called after throwing an instance of 'int'
terminate called recursively
Aborted (core dumped)
```
** Affects: libunwind (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "small reproducer"
https://bugs.launchpad.net/bugs/1999104/+attachment/5635122/+files/libunwind.tar.gz
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https://bugs.launchpad.net/bugs/1999104
Title:
libunwind causes crashes on arm64
Status in libunwind package in Ubuntu:
New
Bug description:
There is a bug in libunwind in both 18.04 and 20.04 on arm64 where
when linked with libunwind instead of catching an exception, the
program crashes. This was first seen on mcrouter, but attached is a
small reproducer where `main_unwind` will crash. The libunwind
shipping with 22.04 doesn't appear to have this problem, nor do
unmodified upstream versions (including the 1.2.1 which is the 18.04
and 20.04 version).
Attached is a small reproducer that demonstrates the problem.
Ubuntu 22.04:
```
$ ./main
int throws lib
int caught main
$ ./main_unwind
int throws lib
int caught main
```
Ubuntu 20.04:
```
$ ./main
int throws lib
int caught main
$ ./main_unwind
terminate called after throwing an instance of 'int'
terminate called recursively
Aborted (core dumped)
```
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/libunwind/+bug/1999104/+subscriptions
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