Caja crash on "Safely remove drive"

[mikewhatever]

Caja segfaults on safely removing an external usb HDD.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: caja 1.20.2-4ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-72.81-generic 4.15.18
Uname: Linux 4.15.0-72-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.9-0ubuntu7.9
Architecture: amd64
CurrentDesktop: MATE
Date: Sun Dec 22 00:36:33 2019
InstallationDate: Installed on 2018-07-31 (508 days ago)
InstallationMedia: Ubuntu-MATE 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
SourcePackage: caja
UpgradeStatus: No upgrade log present (probably fresh install)

[mikewhatever (mikewhatever)]

The bug is easy to reproduce. Connect an external HDD, make sure it is mounted, then right click its icon in Caja's left panel and select "Safely remove". Ten seconds later Caja will close,and apport will pop its usual window. There are .crash files in /var/crash, and I'll add that info, as soon as I figure out how. Meanwhile, here is dmesg:

$ dmesg | tail
[14772.162385] sd 4:0:0:0: [sdb] Write Protect is off
[14772.162389] sd 4:0:0:0: [sdb] Mode Sense: 47 00 10 08
[14772.163512] sd 4:0:0:0: [sdb] No Caching mode page found
[14772.163521] sd 4:0:0:0: [sdb] Assuming drive cache: write through
[14772.295950] sdb: sdb1
[14772.304778] sd 4:0:0:0: [sdb] Attached SCSI disk
[14784.908680] EXT4-fs (sdb1): mounted filesystem with ordered data mode. Opts: (null)
[14798.453462] usb 2-2: USB disconnect, device number 2
[14798.484561] show_signal_msg: 5 callbacks suppressed
[14798.484567] caja[1148]: segfault at 4 ip 00005585c34665a4 sp 00007ffd024b6dd0 error 4 in caja[5585c33f5000+1cf000]

[mikewhatever (mikewhatever)]

There seems to be no way to add this report with apport, so I'll make an attachment.

[mikewhatever (mikewhatever)]

The report is quite big, and shows lots of gibberish, so don't just click it. Download the file and run <apport-cli -c _usr_bin_caja.1000.crash>.

[mikewhatever (mikewhatever)]

It looks like the same bug had been fixed in Dec 2018 https://github.com/mate-desktop/caja/issues/1046. Ubuntu-Mate 18.04 is apparently still broken.