Re: ceph node crashed with these errors "kernel: ceph: build_snap_context" (maybe now it is urgent?)

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On Mon, Dec 02, 2019 at 10:27:21AM +0100, Marc Roos wrote:
> 
> I have been asking before[1]. Since Nautilus upgrade I am having these, 
> with a total node failure as a result(?). Was not expecting this in my 
> 'low load' setup. Maybe now someone can help resolving this? I am also 
> waiting quite some time to get access at 
> https://tracker.ceph.com/issues. 
 
Just a wild guess: do you have a lot of snapshots (> ~400)?  If so,
that's probably the problem.  See [1] and [2].

[1] https://docs.ceph.com/docs/master/cephfs/experimental-features/#snapshots
[2] https://tracker.ceph.com/issues/21420

Cheers,
--
Luís

> 
> 
> Dec 1 03:14:36 c04 kernel: ceph: build_snap_context 100020c9287 
> ffff911a9a26bd00 fail -12
> Dec 1 03:14:36 c04 kernel: ceph: build_snap_context 100020c9283 
> ffff911d34e69d00 fail -12
> Dec 1 03:14:36 c04 kernel: ceph: build_snap_context 100020c9276 
> ffff911d34e69c00 fail -12
> Dec 1 03:14:36 c04 kernel: ceph: build_snap_context 100020c926c 
> ffff912068b92c00 fail -12
> Dec 1 03:14:36 c04 kernel: ceph: build_snap_context 100020c9268 
> ffff912068b93000 fail -12
> Dec 1 03:14:36 c04 kernel: ceph: build_snap_context 100020c926d 
> ffff912068b92900 fail -12
> Dec 1 03:14:36 c04 kernel: ceph: build_snap_context 100020c928a 
> ffff912118e5be00 fail -12
> Dec 1 03:14:36 c04 kernel: ceph: build_snap_context 100020c9272 
> ffff9119950d9500 fail -12
> Dec 1 03:14:36 c04 kernel: ceph: build_snap_context 100020c9269 
> ffff911940f3d000 fail -12
> Dec 1 03:14:36 c04 kernel: ceph: build_snap_context 100020c9270 
> ffff911748427c00 fail -12
> Dec 1 03:14:36 c04 kernel: ceph: build_snap_context 100020c926b 
> ffff91169b000600 fail -12
> Dec 1 03:14:36 c04 kernel: ceph: build_snap_context 100020c9281 
> ffff91169b000500 fail -12
> Dec 1 03:14:36 c04 kernel: ceph: build_snap_context 100020c9288 
> ffff9115844d2500 fail -12
> Dec 1 03:14:36 c04 kernel: ceph: build_snap_context 100020c927d 
> ffff9115844d2e00 fail -12
> Dec 1 03:14:36 c04 kernel: ceph: build_snap_context 100020c9280 
> ffff91186401b000 fail -12
> Dec 1 03:14:36 c04 kernel: ceph: build_snap_context 100020c9267 
> ffff9121535ecc00 fail -12
> Dec 1 03:14:36 c04 kernel: ceph: build_snap_context 100020c927c 
> ffff9121cecb1e00 fail -12
> Dec 1 03:14:36 c04 kernel: ceph: build_snap_context 100020c9271 
> ffff9121cecb0400 fail -12
> Dec 1 03:14:36 c04 kernel: ceph: build_snap_context 100020c9279 
> ffff911d26646300 fail -12
> Dec 1 03:14:36 c04 kernel: ceph: build_snap_context 100020c927f 
> ffff911d26646900 fail -12
> Dec 1 03:14:36 c04 kernel: ceph: build_snap_context 100020c9275 
> ffff9121cecb1700 fail -12
> Dec 1 03:14:36 c04 kernel: ceph: build_snap_context 100020c9259 
> ffff91170c9f6600 fail -12
> Dec 1 03:14:36 c04 kernel: ceph: build_snap_context 100020c9257 
> ffff9118ef2a8000 fail -12
> Dec 1 03:14:36 c04 kernel: ceph: build_snap_context 100020c924e 
> ffff911a1e091800 fail -12
> Dec 1 03:14:36 c04 kernel: ceph: build_snap_context 100020c9262 
> ffff911a1e090c00 fail -12
> Dec 1 03:14:36 c04 kernel: ceph: build_snap_context 100020c9266 
> ffff9115e3859500 fail -12
> Dec 1 03:14:36 c04 kernel: ceph: build_snap_context 100020c924f 
> ffff9118aefd1300 fail -12
> Dec 1 03:14:36 c04 kernel: ceph: build_snap_context 100020c925f 
> ffff91170c9f6100 fail -12
> Dec 1 03:14:36 c04 kernel: ceph: build_snap_context 100020c9252 
> ffff9115e3859800 fail -12
> Dec 1 03:14:36 c04 kernel: ceph: build_snap_context 100020c9256 
> ffff912045dc5300 fail -12
> Dec 1 03:14:36 c04 kernel: ceph: build_snap_context 100020c9254 
> ffff91170c9f6900 fail -12
> Dec 1 03:14:36 c04 kernel: ceph: build_snap_context 100020c9261 
> ffff91170c9f7100 fail -12
> Dec 1 03:14:36 c04 kernel: ceph: build_snap_context 100020d4ec4 
> ffff9118aefd0000 fail -12
> 
> [1]
> https://www.mail-archive.com/ceph-users@xxxxxxx/msg01088.html
> https://www.mail-archive.com/ceph-users@xxxxxxx/msg00969.html
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