** Description changed:
[Impact]
The radosgw beast frontend in ceph nautilus might hit coroutine stack
corruption on startup and requests.
This is usually observed right at the startup of the ceph-radosgw systemd
unit; sometimes 1 minute later.
But it might occur any time handling requests, depending on
coroutine/request's function path/stack size.
The symptoms are usually a crash with stack trace listing TCMalloc
(de)allocate/release to central cache,
but less rare signs are large allocs in the _terabytes_ range (pointer to
stack used as allocation size)
and stack traces showing function return addresses (RIP) that are actually
pointers to an stack address.
This is not widely hit in Ubuntu as most deployments use the ceph-radosgw
charm that hardcodes 'civetweb'
as rgw frontend, which is _not_ affected; custom/cephadm deployments that
choose 'beast' might hit this.
- @ charm-ceph-radosgw/templates/ceph.conf
- rgw frontends = civetweb port={{ port }}
+ @ charm-ceph-radosgw/templates/ceph.conf
+ rgw frontends = civetweb port={{ port }}
Let's report this LP bug for documentation and tracking purposes until
UCA gets the fixes.
[Fix]
This has been reported by an Ubuntu Advantage user, and another user in ceph
tracker #47910 [1].
This had been reported and fixed in Octopus [2] (confirmed by UA user; no
longer affected.)
The Nautilus backport has recently been merged [3, 4] and should be
- available in v14.2.19.
+ available in v14.2.20.
[Test Case]
The conditions to trigger the bug aren't clear, but apparently related to EC
pools w/ very large buckets,
and of course the radosgw frontend beast being enabled (civetweb is not
affected.)
[Where problems could occur]
The fixes are restricted to the beast frontend, specifically to the
coroutines used to handle requests.
So problems would probably be seen in request handling only with the beast
frontend.
Workarounds thus include switching back to the civetweb frontend.
This changes core/base parts of the RGW beast frontend code, but are in place
from Octopus released.
The other user/reporter in the ceph tracker has been using the patches for
weeks with no regression;
the ceph tests have passed and likely serious issues would be caught by ceph
CI upstream.
[1] https://tracker.ceph.com/issues/47910 report tracker (nautilus)
[2] https://tracker.ceph.com/issues/43739 master tracker (octopus)
[3] https://tracker.ceph.com/issues/43921 backport tracker (nautilus)
[4] https://github.com/ceph/ceph/pull/39947 github PR
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https://bugs.launchpad.net/bugs/1921749
Title:
nautilus: ceph radosgw beast frontend coroutine stack corruption
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