Date: Mon, 27 Jul 2020 00:00:11 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 248286] ZFS deadlock when rename the volumes Message-ID: <bug-248286-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248286 Bug ID: 248286 Summary: ZFS deadlock when rename the volumes Product: Base System Version: 12.1-RELEASE Hardware: amd64 OS: Any Status: New Severity: Affects Many People Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: fbsd-bugzilla@aj.admwt.jp I use bhyve very heavily, and when I ran zfs rename to clean up the VM's disk image (ZFS Volume), the ZFS deadlocked inside the kernel. The procedure to recreate it is as follows. ========================== $ gpart add -s 20g -t freebsd-zfs -a 4k -l zdead1 ada0 ada0p9 added $ zpool create -O compression=lz4 -m none zbad ada0p9 $ zfs list -r zbad NAME USED AVAIL REFER MOUNTPOINT zbad 334K 18.9G 23K none $ xz -dc ~minmin/tmp/zfs/zfs-deadlock-volume.zfs.xz | zfs receive zbad/vm $ zfs list -r zbad NAME USED AVAIL REFER MOUNTPOINT zbad 2.84G 16.1G 23K none zbad/vm 2.83G 16.1G 23K none zbad/vm/debian10 975M 16.1G 961M - zbad/vm/freebsd32 977M 16.1G 977M - zbad/vm/idmdeb10 947M 16.1G 1.55G - $ zfs create zbad/vmn $ zfs list -r zbad NAME USED AVAIL REFER MOUNTPOINT zbad 2.84G 16.1G 23K none zbad/vm 2.83G 16.1G 23K none zbad/vm/debian10 975M 16.1G 961M - zbad/vm/freebsd32 977M 16.1G 977M - zbad/vm/idmdeb10 947M 16.1G 1.55G - zbad/vmn 23K 16.1G 23K none $ cat /var/tmp/zfs/deadlock pool=zbad zfs rename ${pool}/vm/idmdeb10 ${pool}/vmn/idmdeb10 zfs rename ${pool}/vm/freebsd32 ${pool}/vmn/freebsd32 $ sh -x /var/tmp/zfs/deadlock + pool=zbad + zfs rename zbad/vm/idmdeb10 zbad/vmn/idmdeb10 + zfs rename zbad/vm/freebsd32 zbad/vmn/freebsd32 ========================== The second rename operation is not finished. When sleep is placed between rename operations, deadlock does not occur and the operation ends normally. "debian10" and "freebsd32" are bhyve disk images and "idmdeb10" is a ZFS volume cloned from "debian10". I ran the same test on multiple systems and all of them had deadlocks. If you need it for the replication test, I can provide you with the "zfs-deadlock-volume.zfs.xz" image (about 1.5GB) that I used for the test. -- You are receiving this mail because: You are the assignee for the bug.help
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