> Date: Fri, 18 Sep 2020 20:00:49 -0700
> From: Colin Percival <[email protected]>
> Subject: Re: filesystem checksum problems on AWS EC2 instances
> To: ericr <[email protected]>, [email protected],
> Kirk McKusick <[email protected]>
>
> [Adding Kirk since this seems like a UFS issue...]
>
> On 2020-09-16 15:15, ericr wrote:
>> On Tue, Sep 15, 2020 at 6:24 PM Colin Percival <[email protected]> wrote:
>>> On 2020-09-15 14:30, ericr wrote:
>>>> Sep 1 20:50:15 <kern.crit> freebsd kernel: UFS /dev/gpt/rootfs (/)
>>>> cylinder checksum failed: cg 0, cgp: 0x9c14700e != bp: 0x27bfa3d0
>>>> Sep 1 20:50:15 <kern.crit> freebsd syslogd: last message repeated 1
>>> times
>>>> Sep 1 20:50:15 <kern.crit> freebsd kernel: UFS /dev/gpt/rootfs (/)
>>>> cylinder checksum failed: cg 7, cgp: 0x43ed3fa1 != bp: 0xe9b0182e
>>>>
>>>> and from there on, I get cylinder checksum errors pretty often.
>>>
>>> Do you get this if you launch from the non-Marketplace AMIs listed in the
>>> release announcement?
>>> https://www.freebsd.org/releases/12.1R/announce.html
>>
>>
>> Yes. I just tried both of these AMI's from the release notes:
>> us-east-1 region: ami-0de268ac2498ba33d
>> us-east-2 region: ami-0a44f10b2c6deb365
>>
>> I got the same errors.
>
> I've managed to reproduce this, with a filesystem which I've
> verified is clean (at least, which passes fsck) before resizing
> up to ~ 200 GB:
>
>> root@freebsd:/usr/home/ec2-user # fsck_ufs /dev/nvd1p2
>> ** /dev/nvd1p2
>> ** Last Mounted on
>> /releng/12-amd64-GENERIC-release/usr/obj/usr/src/amd64.amd64/release/cw-ec2/new
>> ** Phase 1 - Check Blocks and Sizes
>> ** Phase 2 - Check Pathnames
>> ** Phase 3 - Check Connectivity
>> ** Phase 4 - Check Reference Counts
>> ** Phase 5 - Check Cyl groups
>> 25701 files, 758977 used, 229774 free (9654 frags, 27515 blocks, 1.0%
>> fragmentation)
>>
>> ***** FILE SYSTEM IS CLEAN *****
>> root@freebsd:/usr/home/ec2-user # gpart recover /dev/nvd1
>> nvd1 recovered
>> root@freebsd:/usr/home/ec2-user # gpart resize -i 2 /dev/nvd1
>> nvd1p2 resized
>> root@freebsd:/usr/home/ec2-user # growfs -y /dev/nvd1p2
>> super-block backups (for fsck_ffs -b #) at:
>> [snip]
>> root@freebsd:/usr/home/ec2-user # fsck_ufs /dev/nvd1p2
>> ** /dev/nvd1p2
>> ** Last Mounted on
>> ** Phase 1 - Check Blocks and Sizes
>> ** Phase 2 - Check Pathnames
>> ** Phase 3 - Check Connectivity
>> ** Phase 4 - Check Reference Counts
>> ** Phase 5 - Check Cyl groups
>> CG 0: BAD CHECK-HASH 0x9c14700e vs 0xc9441f74
>> SUMMARY INFORMATION BAD
>> SALVAGE? [yn] n
>>
>> CG 7: BAD CHECK-HASH 0xad168305 vs 0x74ba48a
>> 25701 files, 758977 used, 50019285 free (9661 frags, 6251203 blocks, 0.0%
>> fragmentation)
>>
>> ***** FILE SYSTEM MARKED DIRTY *****
>>
>> ***** PLEASE RERUN FSCK *****
>
> This seems like a bug in UFS and/or growfs, but I'm not familiar enough
> with either to say any more.
>
> Kirk, are you aware of any issues on FreeBSD 12.1-RELEASE which can cause
> cylinder checksum errors after growfs? (On amd64 if it matters.) If it
> would help I can provide you with SSH access to an affected EC2 instance.
>
> --
> Colin Percival
> Security Officer Emeritus, FreeBSD | The power to serve
> Founder, Tarsnap | www.tarsnap.com | Online backups for the truly paranoid
I have managed to reproduce a similar problem in one of my rather
ancient 12.0 bhyve images that I have lying around:
FreeBSD 12.0-STABLE (GENERIC) #5 r350458M: Sat Oct 26 21:18:51 UTC 2019
The follow patch fixes it in that instance. Could you please try this
in the EC2 instance and see if it also resolves your problem.
Kirk McKusick
=-=-=
Index: sbin/growfs/growfs.c
===================================================================
--- sbin/growfs/growfs.c (revision 365971)
+++ sbin/growfs/growfs.c (working copy)
@@ -572,6 +572,7 @@ updjcg(int cylno, time_t modtime, int fsi, int fso
if (sblock.fs_magic == FS_UFS1_MAGIC)
acg.cg_old_ncyl = sblock.fs_old_cpg;
+ cgckhash(&acg);
wtfs(fsbtodb(&sblock, cgtod(&sblock, cylno)),
(size_t)sblock.fs_cgsize, (void *)&acg, fso, Nflag);
DBG_PRINT0("jcg written\n");
@@ -947,6 +948,7 @@ updcsloc(time_t modtime, int fsi, int fso, unsigne
* Now write the former cylinder group containing the cylinder
* summary back to disk.
*/
+ cgckhash(&acg);
wtfs(fsbtodb(&sblock, cgtod(&sblock, ocscg)),
(size_t)sblock.fs_cgsize, (void *)&acg, fso, Nflag);
DBG_PRINT0("oscg written\n");
@@ -1039,6 +1041,7 @@ updcsloc(time_t modtime, int fsi, int fso, unsigne
* Write the new cylinder group containing the cylinder summary
* back to disk.
*/
+ cgckhash(&acg);
wtfs(fsbtodb(&sblock, cgtod(&sblock, ncscg)),
(size_t)sblock.fs_cgsize, (void *)&acg, fso, Nflag);
DBG_PRINT0("nscg written\n");
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