Apport failed to collect crash dump: PermissionError: [Errno 13] Permission denied: 'exe'

[jiangminghui]

ubuntu 20.04 can not collect app dump

ApportLog.txt shows:

```
ERROR: apport (pid 15077) Fri May 12 15:26:09 2023: Unhandled exception:
Traceback (most recent call last):
  File "/usr/share/apport/apport", line 666, in <module>
    exe_mtime = os.stat('exe', dir_fd=proc_pid_fd).st_mtime
PermissionError: [Errno 13] Permission denied: 'exe'
ERROR: apport (pid 15077) Fri May 12 15:26:09 2023: pid: 15077, uid: 0, gid: 0, euid: 0, egid: 0
ERROR: apport (pid 15077) Fri May 12 15:26:09 2023: environment: environ({'LC_CTYPE': 'C.UTF-8'})
```

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: apport 2.20.11-0ubuntu27.25
ProcVersionSignature: Ubuntu 5.13.0-30.33~20.04.1-generic 5.13.19
Uname: Linux 5.13.0-30-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.25
Architecture: amd64
CasperMD5CheckResult: skip
Date: Fri May 12 15:37:13 2023
InstallationDate: Installed on 2022-08-17 (268 days ago)
InstallationMedia: Ubuntu 20.04.4 LTS "Focal Fossa" - Release amd64 (20220223)
PackageArchitecture: all
SourcePackage: apport
UpgradeStatus: No upgrade log present (probably fresh install)

[Benjamin Drung (bdrung)]

Thank you for taking the time to report this bug and helping to make Ubuntu better.

ApportLog.txt shows:

```
ERROR: apport (pid 15077) Fri May 12 15:26:09 2023: Unhandled exception:
Traceback (most recent call last):
  File "/usr/share/apport/apport", line 666, in <module>
    exe_mtime = os.stat('exe', dir_fd=proc_pid_fd).st_mtime
PermissionError: [Errno 13] Permission denied: 'exe'
ERROR: apport (pid 15077) Fri May 12 15:26:09 2023: pid: 15077, uid: 0, gid: 0, euid: 0, egid: 0
ERROR: apport (pid 15077) Fri May 12 15:26:09 2023: environment: environ({'LC_CTYPE': 'C.UTF-8'})
```

Do you know which application crashed?

[Benjamin Drung (bdrung)]

Investigation so far
====================

The crashing Python code line:

```
exe_mtime = os.stat('exe', dir_fd=proc_pid_fd).st_mtime
```

I search my system for processes where /proc/<pid>/exe could not be read by running `sudo ls /proc/[0-9]*/exe` and looking for error messages. I found one process:

```
$ sudo LANG=C stat /proc/6157/exe
  File: /proc/6157/exe -> /snap/snapd/19122/usr/lib/snapd/snapd
  Size: 0 Blocks: 0 IO Block: 1024 symbolic link
Device: 0,22 Inode: 68395 Links: 1
Access: (0777/lrwxrwxrwx) Uid: (1000000/ UNKNOWN) Gid: (1000000/ UNKNOWN)
Access: 2023-05-15 10:35:02.600000873 +0200
Modify: 2023-05-15 10:35:02.584000872 +0200
Change: 2023-05-15 10:35:02.584000872 +0200
 Birth: -
$ sudo LANG=C stat /snap/snapd/19122/usr/lib/snapd/snapd
stat: cannot statx '/snap/snapd/19122/usr/lib/snapd/snapd': No such file or directory
```