Re: BUG: kvm crashing in void librbd::AioCompletion::complete_request

[Stefan Priebe <s.priebe@profihost.ag>]

Can i merge wip-rbd-read into master?

Stefan
Am 04.11.2012 15:06, schrieb Sage Weil:
> On Sun, 4 Nov 2012, Stefan Priebe wrote:
>> Hello,
>>
>> while benchmarking the new v2 rbd format i saw several crashes of KVM. First i
>> thought this was kernel related but i was just happening faster with one
>> kernel than the other.
>
> Can you try the wip-rbd-read branch?  It has a bunch of fixes that aren't
> in master yet.  I haven't seen this specific crash (I don't think), but I
> was reliable hitting other issues with master that wip-rbd-read reslves.
>
> Alternatively, you could cherry-pick
> b1d866efbdf7e8a7bc083b1f3ea56f24e10c8fcd, which I'm guessing is your
> problem.
>
> Thanks!
> sage
>
>
>>
>> The KVM crash / exit looks like this:
>> librbd/AioCompletion.cc: In function 'void
>> librbd::AioCompletion::complete_request(CephContext*, ssize_t)' thread
>> 7f73db67c780 time 2012-11-04 14:59:44.997009
>> librbd/AioCompletion.cc: 43: FAILED assert(bl.length() == read_buf_len)
>>   ceph version 0.53-585-ga01b112 (a01b112d71a0b6a1bb206d53867d13536d17bbf6)
>>   1: (librbd::AioCompletion::complete_request(CephContext*, long)+0xa89)
>> [0x7f73d9337319]
>>   2: (librbd::C_AioRead::finish(int)+0x174) [0x7f73d93374e4]
>>   3: (Context::complete(int)+0xa) [0x7f73d933796a]
>>   4: (librbd::C_CacheRead::finish(int)+0xe) [0x7f73d933683e]
>>   5: (Context::complete(int)+0xa) [0x7f73d933796a]
>>   6: (librbd::ImageCtx::aio_read_from_cache(object_t, ceph::buffer::list*,
>> unsigned long, unsigned long, Context*)+0x3a0) [0x7f73d9347bd0]
>>   7: (librbd::aio_read(librbd::ImageCtx*, std::vector<std::pair<unsigned long,
>> unsigned long>, std::allocator<std::pair<unsigned long, unsigned long> > >
>> const&, char*, ceph::buffer::list*, librbd::AioCompletion*)+0x765)
>> [0x7f73d9354995]
>>   8: (librbd::aio_read(librbd::ImageCtx*, unsigned long, unsigned long, char*,
>> ceph::buffer::list*, librbd::AioCompletion*)+0xa2) [0x7f73d9354f92]
>>   9: (()+0x9f2de) [0x7f73db73d2de]
>>   10: (()+0x9f490) [0x7f73db73d490]
>>   11: (()+0x83c45) [0x7f73db721c45]
>>   12: (()+0x850ea) [0x7f73db7230ea]
>>   NOTE: a copy of the executable, or `objdump -rdS <executable>` is needed to
>> interpret this.
>> terminate called after throwing an instance of 'ceph::FailedAssertion'
>>
>> Stefan
>> --
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>>