Date: Tue, 22 Mar 2016 21:25:20 +0100 From: Peter Holm <peter@holm.cc> To: Nick Evans <nevans@talkpoint.com> Cc: freebsd-questions@freebsd.org, Konstantin Belousov <kostikbel@gmail.com> Subject: Re: Intel 750 Panic Unmounting During TRIM Message-ID: <20160322202520.GA32179@x2.osted.lan> In-Reply-To: <20160322125935.6be25e20@pleiades.nextvenue.com> References: <20160322125935.6be25e20@pleiades.nextvenue.com>
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On Tue, Mar 22, 2016 at 12:59:35PM -0400, Nick Evans wrote: > I've got a test system with a 400GB Intel 750 NVME SSD formatted UFS > 1mb/4k aligned > > http://www.intel.com/content/www/us/en/solid-state-drives/solid-state-drives-750-series.html > > I moved a 50 gigabyte directory off the drive so I could try another > drive configuration and while the drive was trimming, I ran umount on > the mounted device. umount sat there without returning to the prompt. On > another terminal, mount showed the drive unmounted, but after a minute > or so in this state with gstat running to show io, the system panicked. > > I tried to reproduce this a second time by generating a 100gb file from > /dev/zero. Deleted the file ran umount which hung again. This time > after a while it returned to the prompt stating the device was > busy so I tried to umount again while the drive was still trimming. > After a short while the system panicked. It seems the panic happens > when the TRIM finishes while umount is trying to do its thing. The > system is 10.2-RELEASE-p13, GENERIC kernel, Intel 4790K on a Asus Z97-A > motherboard, 32GB ram. I have a second Intel 750 drive in another PCI > Express slot but it's unused at the moment. > > Below are the dumps recorded after the system booted back up. This is a > test system so I can bring it up and down as needed to test fixes. The > second dump is from my reproduced test: > > > panic: losing buffer 1 > cpuid = 2 I see a different panic with this scenario: panic: Lock Per-Filesystem Softdep Lock not exclusively locked @ ../../../ufs/ffs/ffs_softdep.c:1950 https://people.freebsd.org/~pho/stress/log/trim7.txt - Peter
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