Bug 201735
| Summary: | zpool export fails after process accesses .zfs/snapshot directory | ||
|---|---|---|---|
| Product: | Base System | Reporter: | Marcus Reid <marcus> |
| Component: | kern | Assignee: | freebsd-fs (Nobody) <fs> |
| Status: | Open --- | ||
| Severity: | Affects Some People | ||
| Priority: | --- | ||
| Version: | CURRENT | ||
| Hardware: | Any | ||
| OS: | Any | ||
Not reproducible for me with OpenZFS in CURRENT. Below: * a first attempt to export was made very soon after changing directory * the second attempt, a few seconds later, succeeded. root@mowa219-gjp4-8570p-freebsd:~ # mount | grep Transcend Transcend on /media/t1000 (zfs, local, nfsv4acls) Transcend/VirtualBox on /media/t1000/VirtualBox (zfs, local, nfsv4acls) root@mowa219-gjp4-8570p-freebsd:~ # cd /media/t1000/.zfs/snapshot root@mowa219-gjp4-8570p-freebsd:/media/t1000/.zfs/snapshot # cd root@mowa219-gjp4-8570p-freebsd:~ # time zpool export Transcend cannot unmount '/media/t1000/VirtualBox': pool or dataset is busy 0.006u 0.006s 0:00.02 0.0% 0+0k 3+0io 3pf+0w root@mowa219-gjp4-8570p-freebsd:~ # date ; time ; zpool export Transcend Mon Sep 11 07:49:41 BST 2023 0.394u 1.228s 17:29:44.80 0.0% 389+199k 1304+0io 953pf+0w root@mowa219-gjp4-8570p-freebsd:~ # ---- % zfs version zfs-2.2.99-FreeBSD_g804414aad zfs-kmod-2.2.99-FreeBSD_g804414aad % zpool version zfs-2.2.99-FreeBSD_g804414aad zfs-kmod-2.2.99-FreeBSD_g804414aad % uname -aKU FreeBSD mowa219-gjp4-8570p-freebsd 15.0-CURRENT FreeBSD 15.0-CURRENT amd64 1500000 #11 main-n265135-07bc20e4740d-dirty: Sat Sep 2 19:40:08 BST 2023 grahamperrin@mowa219-gjp4-8570p-freebsd:/usr/obj/usr/src/amd64.amd64/sys/GENERIC-NODEBUG amd64 1500000 1500000 % |
This is broken: # zpool import derp # cd /derp/archive/archive/.zfs/snapshot # ls 20141204 20141227 20150209 20150708 20150720 # cd / # zpool export derp cannot unmount '/derp/archive/archive': Device busy This works: # zpool import derp cd# cd /derp/archive/archive/.zfs/snapshot # ls 20141204 20141227 20150209 20150708 20150720 # cd / # zfs unmount derp/archive/archive # zpool export derp # However, if you trigger the export bug first, the unmount is broken too. This might provide a clue as to where the problem is. # zpool import derp # cd /derp/archive/archive/.zfs/snapshot # ls 20141204 20141227 20150209 20150708 20150720 # cd / # zpool export derp cannot unmount '/derp/archive/archive': Device busy # zfs unmount derp/archive/archive cannot unmount '/derp/archive/archive': Device busy