----------------------------------------
> Date: Wed, 24 Jun 2015 17:04:05 -0400
> From: yehuda@xxxxxxxxxx
> To: yguang11@xxxxxxxxxxx
> CC: ceph-devel@xxxxxxxxxxxxxxx; ceph-users@xxxxxxxxxxxxxx
> Subject: Re: radosgw crash within libfcgi
>
>
>
> ----- Original Message -----
>> From: "GuangYang" <yguang11@xxxxxxxxxxx>
>> To: "Yehuda Sadeh-Weinraub" <yehuda@xxxxxxxxxx>
>> Cc: ceph-devel@xxxxxxxxxxxxxxx, ceph-users@xxxxxxxxxxxxxx
>> Sent: Wednesday, June 24, 2015 1:53:20 PM
>> Subject: RE: radosgw crash within libfcgi
>>
>> Thanks Yehuda for the response.
>>
>> We already patched libfcgi to use poll instead of select to overcome the
>> limitation.
>>
>> Thanks,
>> Guang
>>
>>
>> ----------------------------------------
>>> Date: Wed, 24 Jun 2015 14:40:25 -0400
>>> From: yehuda@xxxxxxxxxx
>>> To: yguang11@xxxxxxxxxxx
>>> CC: ceph-devel@xxxxxxxxxxxxxxx; ceph-users@xxxxxxxxxxxxxx
>>> Subject: Re: radosgw crash within libfcgi
>>>
>>>
>>>
>>> ----- Original Message -----
>>>> From: "GuangYang" <yguang11@xxxxxxxxxxx>
>>>> To: ceph-devel@xxxxxxxxxxxxxxx, ceph-users@xxxxxxxxxxxxxx,
>>>> yehuda@xxxxxxxxxx
>>>> Sent: Wednesday, June 24, 2015 10:09:58 AM
>>>> Subject: radosgw crash within libfcgi
>>>>
>>>> Hello Cephers,
>>>> Recently we have several radosgw daemon crashes with the same following
>>>> kernel log:
>>>>
>>>> Jun 23 14:17:38 xxx kernel: radosgw[68180]: segfault at f0 ip
>>>> 00007ffa069996f2 sp 00007ff55c432710 error 6 in
>
> error 6 is sigabrt, right? With invalid pointer I'd expect to get segfault. Is the pointer actually invalid?
With (ip - {address_load_the_sharded_library}) to get the instruction which caused this crash, the objdump shows the crash happened at instruction 46f2 (see below), which was to assign '-1' to the CGX_Request::ipcFd to -1, but I don't quite understand how/why it could crash there.
0000000000004690 <FCGX_Free>:
4690: 48 89 5c 24 f0 mov %rbx,-0x10(%rsp)
4695: 48 89 6c 24 f8 mov %rbp,-0x8(%rsp)
469a: 48 83 ec 18 sub $0x18,%rsp
469e: 48 85 ff test %rdi,%rdi
46a1: 48 89 fb mov %rdi,%rbx
46a4: 89 f5 mov %esi,%ebp
46a6: 74 28 je 46d0 <FCGX_Free+0x40>
46a8: 48 8d 7f 08 lea 0x8(%rdi),%rdi
46ac: e8 67 e3 ff ff callq 2a18 <FCGX_FreeStream@plt>
46b1: 48 8d 7b 10 lea 0x10(%rbx),%rdi
46b5: e8 5e e3 ff ff callq 2a18 <FCGX_FreeStream@plt>
46ba: 48 8d 7b 18 lea 0x18(%rbx),%rdi
46be: e8 55 e3 ff ff callq 2a18 <FCGX_FreeStream@plt>
46c3: 48 8d 7b 28 lea 0x28(%rbx),%rdi
46c7: e8 d4 f4 ff ff callq 3ba0 <FCGX_PutS+0x40>
46cc: 85 ed test %ebp,%ebp
46ce: 75 10 jne 46e0 <FCGX_Free+0x50>
46d0: 48 8b 5c 24 08 mov 0x8(%rsp),%rbx
46d5: 48 8b 6c 24 10 mov 0x10(%rsp),%rbp
46da: 48 83 c4 18 add $0x18,%rsp
46de: c3 retq
46df: 90 nop
46e0: 31 f6 xor %esi,%esi
46e2: 83 7b 4c 00 cmpl $0x0,0x4c(%rbx)
46e6: 8b 7b 30 mov 0x30(%rbx),%edi
46e9: 40 0f 94 c6 sete %sil
46ed: e8 86 e6 ff ff callq 2d78 <OS_IpcClose@plt>
46f2: c7 43 30 ff ff ff ff movl $0xffffffff,0x30(%rbx)
>
> Yehuda
>
>
>>>> libfcgi.so.0.0.0[7ffa06995000+a000] in libfcgi.so.0.0.0[7ffa06995000+a000]
>>>>
>>>> Looking at the assembly, it seems crashing at this point -
>>>> http://github.com/sknown/fcgi/blob/master/libfcgi/fcgiapp.c#L2035, which
>>>> confused me. I tried to see if there is any other reference holding the
>>>> FCGX_Request which release the handle without any luck.
>>>>
>>>> There are also other observations:
>>>> 1> Several radosgw daemon across different hosts crashed around the same
>>>> time.
>>>> 2> Apache's error log has some fcgi error complaining ##idle timeout##
>>>> during the time.
>>>>
>>>> Does anyone experience similar issue?
>>>>
>>>
>>> In the past we've had issues with libfcgi that were related to the number
>>> of open fds on the process (> 1024). The issue was a buggy libfcgi that
>>> was using select() instead of poll(), so this might be the issue you're
>>> noticing.
>>>
>>> Yehuda
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