Date: Fri, 25 Aug 2017 05:26:48 -0400 From: Mike Tancsa <mike@sentex.net> To: Shane Ambler <FreeBSD@ShaneWare.Biz>, FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org> Subject: Re: file system deadlock in RELENG_11 Message-ID: <d76fca24-1fe2-d2e9-5ad4-6b690c1c9c54@sentex.net> In-Reply-To: <d8de9997-40a0-14d1-7023-7273c4694af3@ShaneWare.Biz> References: <66b97b27-cbea-a3a8-374d-3f7c017b5418@sentex.net> <28c89f80-4797-7e95-a637-472ac7bc98a5@sentex.net> <4ec50e48-58a5-1f49-3acf-d3b21535c36e@sentex.net> <d8de9997-40a0-14d1-7023-7273c4694af3@ShaneWare.Biz>
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On 8/24/2017 9:33 PM, Shane Ambler wrote: > On 25/08/2017 05:40, Mike Tancsa wrote: >> On 8/24/2017 4:01 PM, Mike Tancsa wrote: >>> OK, this is fairly easy to repeat. If I start a sync of a snapshot via >>> zrep, it hangs the box. CTRL+T shows >>> >>> >>> DEBUG: overiding stale lock on zroot/chyves from pid 19378 >>> sending zroot/chyves@zrep_000010 to 10.151.9.2:zroot/chyves >>> cannot receive new filesystem stream: destination >>> 'zroot/chyves/guests/resi/disk1' exists >>> must specify -F to overwrite it > > Are you sending a snapshot from the host to the guest? > or is the guest sending to the host? sending a snapshot from an active host, to a guest. >> root 29683 0.0 0.0 7752 3824 5 DE+ 15:53 0:00.32 zfs >> send -R -I zroot/chyves@zrep_00000d zroot/chyves@zrep_000010 >> root 29690 0.0 0.0 7752 3492 5 D+ 15:53 0:00.00 zfs >> rename zroot/chyves@zrep_000010 zroot/chyves@zrep_000010_unsent >> > > Should be unrelated but several years ago there was a deadlock issue > when renaming a zvol, unless the fix got undone recently this may just > be a distraction or a hint of a solution... > > https://svnweb.freebsd.org/base?view=revision&revision=272474 Hmmm, that does sound familiar. I will try and recreate this next week on a non production box. ---Mike -- ------------------- Mike Tancsa, tel +1 519 651 3400 Sentex Communications, mike@sentex.net Providing Internet services since 1994 www.sentex.net Cambridge, Ontario Canada http://www.tancsa.com/
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