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IDProjectCategoryView StatusLast Update
0000400AlmaLinux-8autofspublic2023-05-25 16:12
Reporterlantzer Assigned To 
PriorityhighSeveritycrashReproducibilityalways
Status newResolutionopen 
Platformx86_64OSAlma LinuxOS Version8.8
Summary0000400: Crash when restarting autofs when a direct map-ed directory is busy and cannot be unmounted
DescriptionAfter upgrading to Alma Linux 8.8, the autofs 1:5.1.4-93.el8 package now crashes when the autofs service is restarted while a direct mapped mount is in use. This problem did not happen with Alma Linux 8.7 and autofs 1:5.1.4-83.el8. This problem also does not happen for an indirect mount, as it appears to be directly related to the autofs virtual mount and the target mount using the same directory.
Steps To ReproduceCreate a direct map in autofs to mount an exported directory on an NFS server, change to that directory, then restart the autofs service. At this point the service crashes.

/etc/auto.master:
/- /etc/auto.home

/etc/auto.home:
/home nfsserver.local:/export

cd /home
systemctl restart autofs
# autofs crashes
Additional InformationMay 25 10:56:51 localhost systemd[1]: Stopping Automounts filesystems on demand...
May 25 10:56:53 localhost systemd[1]: autofs.service: Succeeded.
May 25 10:56:53 localhost systemd[1]: Stopped Automounts filesystems on demand.
May 25 10:56:53 localhost systemd[1]: Starting Automounts filesystems on demand...
May 25 10:56:53 localhost systemd[1]: tmp-autozPOEVP.mount: Succeeded.
May 25 10:56:53 localhost systemd[1]: tmp-autoYYS6Qj.mount: Succeeded.
May 25 10:56:53 localhost kernel: automount[2193290]: segfault at 28 ip 000055a2e7004b39 sp 00007ff7f2968970 error 4 in automount[55a2e6fdb000+4b000]
May 25 10:56:53 localhost kernel: Code: 01 00 31 c0 31 ed 48 8d 35 5d 5f 01 00 e8 af 18 00 00 41 83 fe 01 0f 84 d5 01 00 00 41 83 a4 24 90 00 00 00 fd 49 8b 44 24 30 <4c> 8b 40 28 41 80 38 2f 0f 84 99 01 00 00 4c 8d ac 24 00 01 00 00
May 25 10:56:53 localhost systemd[1]: Started Process Core Dump (PID 2193293/UID 0).
May 25 10:56:53 localhost systemd-coredump[2193294]: Process 2193284 (automount) of user 0 dumped core.

                                                                              Stack trace of thread 2193290:
                                                                              #0 0x000055a2e7004b39 try_remount (automount)
                                                                              #1 0x000055a2e6feeb0c do_mount_autofs_direct (automount)
                                                                              0000002 0x000055a2e6feef72 mount_autofs_direct (automount)
                                                                              0000003 0x000055a2e6feb738 handle_mounts (automount)
                                                                              0000004 0x00007ff7f6d3d1cf start_thread (libpthread.so.0)
                                                                              0000005 0x00007ff7f52dce73 __clone (libc.so.6)

                                                                              Stack trace of thread 2193286:
                                                                              #0 0x00007ff7f6d4345c pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
                                                                              #1 0x000055a2e7007ce4 alarm_handler (automount)
                                                                              0000002 0x00007ff7f6d3d1cf start_thread (libpthread.so.0)
                                                                              0000003 0x00007ff7f52dce73 __clone (libc.so.6)

                                                                              Stack trace of thread 2193284:
                                                                              #0 0x00007ff7f6d4345c pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
                                                                              #1 0x000055a2e6ff57cb master_mount_mounts (automount)
                                                                              0000002 0x000055a2e6ff5fcd master_read_master (automount)
                                                                              0000003 0x000055a2e6fe81d4 main (automount)
                                                                              0000004 0x00007ff7f52ddd85 __libc_start_main (libc.so.6)
                                                                              0000005 0x000055a2e6fe89ee _start (automount)

                                                                              Stack trace of thread 2193287:
                                                                              #0 0x00007ff7f6d4345c pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0)
                                                                              #1 0x000055a2e6ffdd3f st_queue_handler (automount)
                                                                              0000002 0x00007ff7f6d3d1cf start_thread (libpthread.so.0)
                                                                              0000003 0x00007ff7f52dce73 __clone (libc.so.6)
May 25 10:56:53 localhost systemd[1]: systemd-coredump@2-2193293-0.service: Succeeded.
May 25 10:56:53 localhost systemd[1]: autofs.service: Main process exited, code=killed, status=11/SEGV
May 25 10:56:53 localhost systemd[1]: autofs.service: Failed with result 'signal'.
May 25 10:56:53 localhost systemd[1]: Failed to start Automounts filesystems on demand.
TagsAlmaLinux, almalinux8, segfault
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Issue History

Date Modified Username Field Change
2023-05-25 16:12 lantzer New Issue
2023-05-25 16:12 lantzer Tag Attached: AlmaLinux
2023-05-25 16:12 lantzer Tag Attached: almalinux8
2023-05-25 16:12 lantzer Tag Attached: segfault