Ah, I made the same mistake... Sorry for the noise.
--
Eino Tuominen
> Ilya Dryomov <idryomov@xxxxxxxxx> kirjoitti 23.7.2015 kello 19.47:
>
>> On Thu, Jul 23, 2015 at 6:28 PM, Vedran Furač <vedran.furac@xxxxxxxxx> wrote:
>>> On 07/23/2015 05:25 PM, Ilya Dryomov wrote:
>>>> On Thu, Jul 23, 2015 at 6:02 PM, Vedran Furač <vedran.furac@xxxxxxxxx> wrote:
>>>> 4118 writev(377, [{"\5\356\307l\361"..., 4096}, {"\337\261\17<\257"...,
>>>> 4096}, {"\211&;s\310"..., 4096}, {"\370N\372:\252"..., 4096},
>>>> {"\202\311/\347\260"..., 4096}, ...], 33) = ? ERESTARTSYS (To be restarted)
>>>> 4118 --- SIGALRM (Alarm clock) @ 0 (0) ---
>>>> 4118 rt_sigreturn(0xe) = -1 EINTR (Interrupted system call)
>>>> 4118 gettid() = 4118
>>>> 4118 write(4, "2015/"..., 520) = 520
>>>> 4118 close(1206) = 0
>>>> 4118 unlink("/home/ceph/temp/45/45/5/0000154545") = 0
>>>
>>> Sorry, I misread your original email and missed the nginx part
>>> entirely. Looks like Zheng, who commented on IRC, was right:
>>>
>>> "the ERESTARTSYS is likely caused by some timeout mechanism in nginx
>>> signal handler for SIGALARM does not want to restart the write syscall"
>>
>> Knowing that this might be an nginx issues as well, I've asked the same
>> thing on their mailing list in parallel, their response was:
>>
>> "It more looks like a bug in cephfs. writev() should never return
>> ERESTARTSYS."
>
> To me this looks like a writev() interrupted by a SIGALRM. I think
> nginx guys read your original email the same way I did, which is "write
> syscall *returned* ERESTARTSYS", but I'm pretty sure that is not the
> case here.
>
> ERESTARTSYS shows up in strace output but it is handled by the kernel,
> userpace doesn't see it (but strace has to be able to see it, otherwise
> you wouldn't know if your system call has been restarted or not).
>
> You cut the output short - I asked for the entire output for a reason,
> please paste it somewhere.
>
> Thanks,
>
> Ilya
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