[Gluster-devel] [Gluster-users] Crash in glusterfs!!!

Pranith Kumar Karampuri pkarampu at redhat.com
Tue Sep 25 08:57:03 UTC 2018


On Tue, Sep 25, 2018 at 2:17 PM ABHISHEK PALIWAL <abhishpaliwal at gmail.com>
wrote:

> I don't have the step to reproduce, but its a race condition where it
> seems cleanup_and_exit() is accessing the data structure which are not yet
> initialised (as gluster is in starting phase), due to SIGTERM/SIGINT is
> sent in between.
>

But the crash happened inside exit() code for which will be in libc which
doesn't access any data structures in glusterfs.


>
> Regards,
> Abhishek
>
> On Mon, Sep 24, 2018 at 9:11 PM Pranith Kumar Karampuri <
> pkarampu at redhat.com> wrote:
>
>>
>>
>> On Mon, Sep 24, 2018 at 5:16 PM ABHISHEK PALIWAL <abhishpaliwal at gmail.com>
>> wrote:
>>
>>> Hi Pranith,
>>>
>>> As we know this problem is getting triggered at startup of the glusterd
>>> process when it received the SIGTERM.
>>>
>>> I think there is a problem in glusterfs code, if at startup someone sent
>>> the SIGTERM the exit handler should not be crash instead it should with
>>> some information.
>>>
>>> Could please let me know the possibility to fix it from glusterfs side?
>>>
>>
>> I am not as confident as you about the RC you provided. If you could give
>> the steps to re-create, I will be happy to confirm that the RC is correct
>> and then I will send out the fix.
>>
>>
>>>
>>> Regards,
>>> Abhishek
>>>
>>> On Mon, Sep 24, 2018 at 3:12 PM Pranith Kumar Karampuri <
>>> pkarampu at redhat.com> wrote:
>>>
>>>>
>>>>
>>>> On Mon, Sep 24, 2018 at 2:09 PM ABHISHEK PALIWAL <
>>>> abhishpaliwal at gmail.com> wrote:
>>>>
>>>>> Could you please let me know about the bug in libc which you are
>>>>> talking.
>>>>>
>>>>
>>>> No, I mean, if you give the steps to reproduce, we will be able to pin
>>>> point if the issue is with libc or glusterfs.
>>>>
>>>>
>>>>>
>>>>> On Mon, Sep 24, 2018 at 2:01 PM Pranith Kumar Karampuri <
>>>>> pkarampu at redhat.com> wrote:
>>>>>
>>>>>>
>>>>>>
>>>>>> On Mon, Sep 24, 2018 at 1:57 PM ABHISHEK PALIWAL <
>>>>>> abhishpaliwal at gmail.com> wrote:
>>>>>>
>>>>>>> If you see the source code in cleanup_and_exit() we are getting the
>>>>>>> SIGSEGV crash when 'exit(0)' is triggered.
>>>>>>>
>>>>>>
>>>>>> yes, that is what I was mentioning earlier. It is crashing in libc.
>>>>>> So either there is a bug in libc (glusterfs actually found 1 bug so far in
>>>>>> libc, so I wouldn't rule out that possibility) or there is something that
>>>>>> is happening in glusterfs which is leading to the problem.
>>>>>> Valgrind/address-sanitizer would help find where the problem could be in
>>>>>> some cases, so before reaching out libc developers, it is better to figure
>>>>>> out where the problem is. Do you have steps to recreate it?
>>>>>>
>>>>>>
>>>>>>>
>>>>>>> On Mon, Sep 24, 2018 at 1:41 PM Pranith Kumar Karampuri <
>>>>>>> pkarampu at redhat.com> wrote:
>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> On Mon, Sep 24, 2018 at 1:36 PM ABHISHEK PALIWAL <
>>>>>>>> abhishpaliwal at gmail.com> wrote:
>>>>>>>>
>>>>>>>>> Hi Sanju,
>>>>>>>>>
>>>>>>>>> Do you have any update on this?
>>>>>>>>>
>>>>>>>>
>>>>>>>> This seems to happen while the process is dying, in libc. I am not
>>>>>>>> completely sure if there is anything glusterfs is contributing to it from
>>>>>>>> the bt at the moment. Do you have any steps to re-create this problem? It
>>>>>>>> is probably better to run the steps with valgrind/address-sanitizer and see
>>>>>>>> if it points to the problem in glusterfs.
>>>>>>>>
>>>>>>>>
>>>>>>>>>
>>>>>>>>> Regards,
>>>>>>>>> Abhishek
>>>>>>>>>
>>>>>>>>> On Fri, Sep 21, 2018 at 4:07 PM ABHISHEK PALIWAL <
>>>>>>>>> abhishpaliwal at gmail.com> wrote:
>>>>>>>>>
>>>>>>>>>> Hi Sanju,
>>>>>>>>>>
>>>>>>>>>> Output of 't a a bt full'
>>>>>>>>>>
>>>>>>>>>> (gdb) t a a bt full
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> Thread 7 (LWP 1743):
>>>>>>>>>>
>>>>>>>>>> #0  0x00003fffa3ea7e88 in __lll_lock_wait (futex=0x0, private=0)
>>>>>>>>>> at lowlevellock.c:43
>>>>>>>>>>
>>>>>>>>>>         r4 = 128
>>>>>>>>>>
>>>>>>>>>>         r7 = 0
>>>>>>>>>>
>>>>>>>>>>         arg2 = 128
>>>>>>>>>>
>>>>>>>>>>         r5 = 2
>>>>>>>>>>
>>>>>>>>>>         r8 = 1
>>>>>>>>>>
>>>>>>>>>>         r0 = 221
>>>>>>>>>>
>>>>>>>>>>         r3 = 0
>>>>>>>>>>
>>>>>>>>>>         r6 = 0
>>>>>>>>>>
>>>>>>>>>>         arg1 = 0
>>>>>>>>>>
>>>>>>>>>>         __err = 221
>>>>>>>>>>
>>>>>>>>>>         __ret = 0
>>>>>>>>>>
>>>>>>>>>> #1  0x00003fffa3e9ef64 in __GI___pthread_mutex_lock
>>>>>>>>>> (mutex=0x100272a8) at ../nptl/pthread_mutex_lock.c:81
>>>>>>>>>>
>>>>>>>>>>         __futex = 0x100272a8
>>>>>>>>>>
>>>>>>>>>>         __PRETTY_FUNCTION__ = "__pthread_mutex_lock"
>>>>>>>>>>
>>>>>>>>>>         type = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         id = <optimized out>
>>>>>>>>>>
>>>>>>>>>> #2  0x00003fffa3f6ce8c in _gf_msg (domain=0x3fff98006c90
>>>>>>>>>> "c_glusterfs-client-0", file=0x3fff9fb34de0 "client.c",
>>>>>>>>>> function=0x3fff9fb34cd8 <__FUNCTION__.18849> "notify",
>>>>>>>>>>
>>>>>>>>>>     line=<optimized out>, level=<optimized out>,
>>>>>>>>>> errnum=<optimized out>, trace=<optimized out>, msgid=114020,
>>>>>>>>>>
>>>>>>>>>>     fmt=0x3fff9fb35350 "parent translators are ready, attempting
>>>>>>>>>> connect on transport") at logging.c:2058
>>>>>>>>>>
>>>>>>>>>>         ret = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         msgstr = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         ap = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         this = 0x3fff980061f0
>>>>>>>>>>
>>>>>>>>>>         ctx = 0x10027010
>>>>>>>>>>
>>>>>>>>>>         callstr = '\000' <repeats 4095 times>
>>>>>>>>>>
>>>>>>>>>>         passcallstr = 0
>>>>>>>>>>
>>>>>>>>>>         log_inited = 0
>>>>>>>>>>
>>>>>>>>>>         __PRETTY_FUNCTION__ = "_gf_msg"
>>>>>>>>>>
>>>>>>>>>> #3  0x00003fff9fb084ac in notify (this=0x3fff980061f0,
>>>>>>>>>> event=<optimized out>, data=0x3fff98008c50) at client.c:2116
>>>>>>>>>>
>>>>>>>>>>         conf = 0x3fff98056dd0
>>>>>>>>>>
>>>>>>>>>>         __FUNCTION__ = "notify"
>>>>>>>>>>
>>>>>>>>>> #4  0x00003fffa3f68ca0 in xlator_notify (xl=0x3fff980061f0,
>>>>>>>>>> event=<optimized out>, data=<optimized out>) at xlator.c:491
>>>>>>>>>>
>>>>>>>>>>         old_THIS = 0x3fff98008c50
>>>>>>>>>>
>>>>>>>>>>         ret = 0
>>>>>>>>>>
>>>>>>>>>> #5  0x00003fffa3f87700 in default_notify (this=0x3fff98008c50,
>>>>>>>>>> event=<optimized out>, data=<optimized out>) at defaults.c:2302
>>>>>>>>>>
>>>>>>>>>>         list = 0x3fff9800a340
>>>>>>>>>>
>>>>>>>>>> #6  0x00003fff9fac922c in afr_notify (this=0x3fff98008c50,
>>>>>>>>>> event=1, data=0x3fff9800a4c0, data2=<optimized out>) at afr-common.c:3967
>>>>>>>>>>
>>>>>>>>>>         priv = 0x3fff98010050
>>>>>>>>>>
>>>>>>>>>>         i = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         up_children = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         down_children = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         propagate = 1
>>>>>>>>>>
>>>>>>>>>>         had_heard_from_all = <optimized out>
>>>>>>>>>>
>>>>>>>>>> ---Type <return> to continue, or q <return> to quit---
>>>>>>>>>>
>>>>>>>>>>         have_heard_from_all = 0
>>>>>>>>>>
>>>>>>>>>>         idx = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         ret = 0
>>>>>>>>>>
>>>>>>>>>>         call_psh = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         input = 0x0
>>>>>>>>>>
>>>>>>>>>>         output = 0x0
>>>>>>>>>>
>>>>>>>>>>         had_quorum = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         has_quorum = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         __FUNCTION__ = "afr_notify"
>>>>>>>>>>
>>>>>>>>>> #7  0x00003fff9fad4994 in notify (this=<optimized out>,
>>>>>>>>>> event=<optimized out>, data=<optimized out>) at afr.c:38
>>>>>>>>>>
>>>>>>>>>>         ret = -1
>>>>>>>>>>
>>>>>>>>>>         ap = 0x3fffa034cc58 ""
>>>>>>>>>>
>>>>>>>>>>         data2 = <optimized out>
>>>>>>>>>>
>>>>>>>>>> #8  0x00003fffa3f68ca0 in xlator_notify (xl=0x3fff98008c50,
>>>>>>>>>> event=<optimized out>, data=<optimized out>) at xlator.c:491
>>>>>>>>>>
>>>>>>>>>>         old_THIS = 0x3fff9800a4c0
>>>>>>>>>>
>>>>>>>>>>         ret = 0
>>>>>>>>>>
>>>>>>>>>> #9  0x00003fffa3f87700 in default_notify (this=0x3fff9800a4c0,
>>>>>>>>>> event=<optimized out>, data=<optimized out>) at defaults.c:2302
>>>>>>>>>>
>>>>>>>>>>         list = 0x3fff9800b710
>>>>>>>>>>
>>>>>>>>>> #10 0x00003fff9fa6b1e4 in notify (this=<optimized out>,
>>>>>>>>>> event=<optimized out>, data=<optimized out>) at io-stats.c:3064
>>>>>>>>>>
>>>>>>>>>>         ret = 0
>>>>>>>>>>
>>>>>>>>>>         args = {type = IOS_DUMP_TYPE_NONE, u = {logfp = 0x0, dict
>>>>>>>>>> = 0x0}}
>>>>>>>>>>
>>>>>>>>>>         op = 0
>>>>>>>>>>
>>>>>>>>>>         list_cnt = 0
>>>>>>>>>>
>>>>>>>>>>         throughput = 0
>>>>>>>>>>
>>>>>>>>>>         time = 0
>>>>>>>>>>
>>>>>>>>>>         is_peek = _gf_false
>>>>>>>>>>
>>>>>>>>>>         ap = 0x3fffa034ce68 ""
>>>>>>>>>>
>>>>>>>>>>         __FUNCTION__ = "notify"
>>>>>>>>>>
>>>>>>>>>> #11 0x00003fffa3f68ca0 in xlator_notify (xl=0x3fff9800a4c0,
>>>>>>>>>> event=<optimized out>, data=<optimized out>) at xlator.c:491
>>>>>>>>>>
>>>>>>>>>>         old_THIS = 0x3fffa402d290 <global_xlator>
>>>>>>>>>>
>>>>>>>>>>         ret = 0
>>>>>>>>>>
>>>>>>>>>> #12 0x00003fffa3fbd560 in glusterfs_graph_parent_up
>>>>>>>>>> (graph=<optimized out>) at graph.c:440
>>>>>>>>>>
>>>>>>>>>>         trav = 0x3fff9800a4c0
>>>>>>>>>>
>>>>>>>>>>         ret = <optimized out>
>>>>>>>>>>
>>>>>>>>>> #13 0x00003fffa3fbdb90 in glusterfs_graph_activate
>>>>>>>>>> (graph=0x3fff98000af0, ctx=0x10027010) at graph.c:688
>>>>>>>>>>
>>>>>>>>>>         ret = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         __FUNCTION__ = "glusterfs_graph_activate"
>>>>>>>>>>
>>>>>>>>>> #14 0x000000001000a49c in glusterfs_process_volfp
>>>>>>>>>> (ctx=0x10027010, fp=0x3fff98001cd0) at glusterfsd.c:2221
>>>>>>>>>>
>>>>>>>>>>         graph = 0x3fff98000af0
>>>>>>>>>>
>>>>>>>>>>         ret = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         trav = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         __FUNCTION__ = <error reading variable __FUNCTION__
>>>>>>>>>> (Cannot access memory at address 0x10010ec0)>
>>>>>>>>>>
>>>>>>>>>> #15 0x000000001000fd08 in mgmt_getspec_cbk (req=<optimized out>,
>>>>>>>>>> iov=<optimized out>, count=<optimized out>, myframe=0x3fffa2bea06c) at
>>>>>>>>>> glusterfsd-mgmt.c:1561
>>>>>>>>>>
>>>>>>>>>>         rsp = {op_ret = 1059, op_errno = 0,
>>>>>>>>>>
>>>>>>>>>>           spec = 0x3fff980018a0 "volume c_glusterfs-client-0\n
>>>>>>>>>> type protocol/client\n    option password
>>>>>>>>>> 5fd8d83d-99f3-4630-97c6-965d7a8ead62\n    option username
>>>>>>>>>> e65687aa-e135-445e-8778-48bb8fb19640\n    option transport-type tcp\n
>>>>>>>>>> "..., xdata = {xdata_len = 0, xdata_val = 0x0}}
>>>>>>>>>>
>>>>>>>>>> ---Type <return> to continue, or q <return> to quit---
>>>>>>>>>>
>>>>>>>>>>         frame = 0x3fffa2bea06c
>>>>>>>>>>
>>>>>>>>>>         ctx = 0x10027010
>>>>>>>>>>
>>>>>>>>>>         ret = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         size = 1059
>>>>>>>>>>
>>>>>>>>>>         tmpfp = 0x3fff98001cd0
>>>>>>>>>>
>>>>>>>>>>         volfilebuf = 0x0
>>>>>>>>>>
>>>>>>>>>>        __FUNCTION__ = <error reading variable __FUNCTION__
>>>>>>>>>> (Cannot access memory at address 0x10013570)>
>>>>>>>>>>
>>>>>>>>>> #16 0x00003fffa3f21ec4 in rpc_clnt_handle_reply (clnt=0x10089020,
>>>>>>>>>> pollin=0x3fff98001760) at rpc-clnt.c:775
>>>>>>>>>>
>>>>>>>>>>         conn = 0x10089050
>>>>>>>>>>
>>>>>>>>>>         saved_frame = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         ret = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         req = 0x1008931c
>>>>>>>>>>
>>>>>>>>>>         xid = 1
>>>>>>>>>>
>>>>>>>>>>         __FUNCTION__ = "rpc_clnt_handle_reply"
>>>>>>>>>>
>>>>>>>>>> #17 0x00003fffa3f223d0 in rpc_clnt_notify (trans=<optimized out>,
>>>>>>>>>> mydata=0x10089050, event=<optimized out>, data=<optimized out>) at
>>>>>>>>>> rpc-clnt.c:933
>>>>>>>>>>
>>>>>>>>>>         conn = 0x10089050
>>>>>>>>>>
>>>>>>>>>>         clnt = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         ret = -1
>>>>>>>>>>
>>>>>>>>>>         req_info = 0x0
>>>>>>>>>>
>>>>>>>>>>         pollin = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         clnt_mydata = 0x0
>>>>>>>>>>
>>>>>>>>>>         old_THIS = 0x3fffa402d290 <global_xlator>
>>>>>>>>>>
>>>>>>>>>>         __FUNCTION__ = "rpc_clnt_notify"
>>>>>>>>>>
>>>>>>>>>> #18 0x00003fffa3f1d4fc in rpc_transport_notify (this=<optimized
>>>>>>>>>> out>, event=<optimized out>, data=<optimized out>) at rpc-transport.c:546
>>>>>>>>>>
>>>>>>>>>>         ret = -1
>>>>>>>>>>
>>>>>>>>>>         __FUNCTION__ = "rpc_transport_notify"
>>>>>>>>>>
>>>>>>>>>> #19 0x00003fffa0401d44 in socket_event_poll_in (this=this at entry=0x1008ab80)
>>>>>>>>>> at socket.c:2236
>>>>>>>>>>
>>>>>>>>>>         ret = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         pollin = 0x3fff98001760
>>>>>>>>>>
>>>>>>>>>>         priv = 0x1008b820
>>>>>>>>>>
>>>>>>>>>> #20 0x00003fffa040489c in socket_event_handler (fd=<optimized
>>>>>>>>>> out>, idx=<optimized out>, data=0x1008ab80, poll_in=<optimized out>,
>>>>>>>>>> poll_out=<optimized out>, poll_err=<optimized out>)
>>>>>>>>>>
>>>>>>>>>>     at socket.c:2349
>>>>>>>>>>
>>>>>>>>>>         this = 0x1008ab80
>>>>>>>>>>
>>>>>>>>>>         priv = 0x1008b820
>>>>>>>>>>
>>>>>>>>>>         ret = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         __FUNCTION__ = "socket_event_handler"
>>>>>>>>>>
>>>>>>>>>> #21 0x00003fffa3fe2874 in event_dispatch_epoll_handler
>>>>>>>>>> (event=0x3fffa034d6a0, event_pool=0x10045bc0) at event-epoll.c:575
>>>>>>>>>>
>>>>>>>>>>         handler = @0x3fffa041f620: 0x3fffa04046f0
>>>>>>>>>> <socket_event_handler>
>>>>>>>>>>
>>>>>>>>>>         gen = 1
>>>>>>>>>>
>>>>>>>>>>         slot = 0x1007cd80
>>>>>>>>>>
>>>>>>>>>>         data = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         ret = -1
>>>>>>>>>>
>>>>>>>>>>         fd = 9
>>>>>>>>>>
>>>>>>>>>>         ev_data = 0x3fffa034d6a8
>>>>>>>>>>
>>>>>>>>>>         idx = 1
>>>>>>>>>>
>>>>>>>>>> #22 event_dispatch_epoll_worker (data=0x1008bd50) at
>>>>>>>>>> event-epoll.c:678
>>>>>>>>>>
>>>>>>>>>> ---Type <return> to continue, or q <return> to quit---
>>>>>>>>>>
>>>>>>>>>>         event = {events = 1, data = {ptr = 0x100000001, fd = 1,
>>>>>>>>>> u32 = 1, u64 = 4294967297}}
>>>>>>>>>>
>>>>>>>>>>         ret = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         ev_data = 0x1008bd50
>>>>>>>>>>
>>>>>>>>>>         event_pool = 0x10045bc0
>>>>>>>>>>
>>>>>>>>>>         myindex = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         timetodie = 0
>>>>>>>>>>
>>>>>>>>>>         __FUNCTION__ = "event_dispatch_epoll_worker"
>>>>>>>>>>
>>>>>>>>>> #23 0x00003fffa3e9bb30 in start_thread (arg=0x3fffa034e160) at
>>>>>>>>>> pthread_create.c:462
>>>>>>>>>>
>>>>>>>>>>         pd = 0x3fffa034e160
>>>>>>>>>>
>>>>>>>>>>         now = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         unwind_buf = {cancel_jmp_buf = {{jmp_buf =
>>>>>>>>>> {2380233324717718430, 70367199403008, 2380233324703897146, 0, 0,
>>>>>>>>>> 70367128645632, 70367137030688, 8388608, 70367199363104, 269008208,
>>>>>>>>>>
>>>>>>>>>>                 70368094386592, 70367199388632, 70367200825640,
>>>>>>>>>> 3, 0, 70367199388648, 70368094386240, 70368094386296, 4001536,
>>>>>>>>>> 70367199364120, 70367137027904, -3187653596,
>>>>>>>>>>
>>>>>>>>>>                 0 <repeats 42 times>}, mask_was_saved = 0}}, priv
>>>>>>>>>> = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0,
>>>>>>>>>> canceltype = 0}}}
>>>>>>>>>>
>>>>>>>>>>         not_first_call = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         pagesize_m1 = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         sp = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         freesize = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         __PRETTY_FUNCTION__ = "start_thread"
>>>>>>>>>>
>>>>>>>>>> #24 0x00003fffa3de60fc in .__clone () at
>>>>>>>>>> ../sysdeps/unix/sysv/linux/powerpc/powerpc64/clone.S:96
>>>>>>>>>>
>>>>>>>>>> No locals.
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> Thread 6 (LWP 1735):
>>>>>>>>>>
>>>>>>>>>> #0  0x00003fffa3ea3ccc in __pthread_cond_timedwait
>>>>>>>>>> (cond=0x10059a98, mutex=0x10059a70, abstime=0x3fffa141f670) at
>>>>>>>>>> pthread_cond_timedwait.c:198
>>>>>>>>>>
>>>>>>>>>>         r4 = 393
>>>>>>>>>>
>>>>>>>>>>         r7 = 0
>>>>>>>>>>
>>>>>>>>>>         arg5 = 0
>>>>>>>>>>
>>>>>>>>>>         arg2 = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         r5 = 2
>>>>>>>>>>
>>>>>>>>>>         r8 = 4294967295
>>>>>>>>>>
>>>>>>>>>>         arg6 = 4294967295
>>>>>>>>>>
>>>>>>>>>>         arg3 = 2
>>>>>>>>>>
>>>>>>>>>>         r0 = 221
>>>>>>>>>>
>>>>>>>>>>         r3 = 516
>>>>>>>>>>
>>>>>>>>>>         r6 = 70367154665072
>>>>>>>>>>
>>>>>>>>>>         arg4 = 70367154665072
>>>>>>>>>>
>>>>>>>>>>         arg1 = 268802716
>>>>>>>>>>
>>>>>>>>>>         __err = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         __ret = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         futex_val = 2
>>>>>>>>>>
>>>>>>>>>>         buffer = {__routine = @0x3fffa3ec0b50: 0x3fffa3ea3400
>>>>>>>>>> <__condvar_cleanup>, __arg = 0x3fffa141f540, __canceltype = 0, __prev = 0x0}
>>>>>>>>>>
>>>>>>>>>>         cbuffer = {oldtype = 0, cond = 0x10059a98, mutex =
>>>>>>>>>> 0x10059a70, bc_seq = 0}
>>>>>>>>>>
>>>>>>>>>>         result = 0
>>>>>>>>>>
>>>>>>>>>>         pshared = 0
>>>>>>>>>>
>>>>>>>>>>         pi_flag = 0
>>>>>>>>>>
>>>>>>>>>>         err = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         val = <optimized out>
>>>>>>>>>>
>>>>>>>>>> ---Type <return> to continue, or q <return> to quit---
>>>>>>>>>>
>>>>>>>>>>         seq = 0
>>>>>>>>>>
>>>>>>>>>> #1  0x00003fffa3fc0e74 in syncenv_task (proc=0x10053eb0) at
>>>>>>>>>> syncop.c:607
>>>>>>>>>>
>>>>>>>>>>         env = 0x10053eb0
>>>>>>>>>>
>>>>>>>>>>         task = 0x0
>>>>>>>>>>
>>>>>>>>>>         sleep_till = {tv_sec = 1536845230, tv_nsec = 0}
>>>>>>>>>>
>>>>>>>>>>         ret = <optimized out>
>>>>>>>>>>
>>>>>>>>>> #2  0x00003fffa3fc1cdc in syncenv_processor (thdata=0x10053eb0)
>>>>>>>>>> at syncop.c:699
>>>>>>>>>>
>>>>>>>>>>         env = 0x10053eb0
>>>>>>>>>>
>>>>>>>>>>         proc = 0x10053eb0
>>>>>>>>>>
>>>>>>>>>>         task = <optimized out>
>>>>>>>>>>
>>>>>>>>>> #3  0x00003fffa3e9bb30 in start_thread (arg=0x3fffa1420160) at
>>>>>>>>>> pthread_create.c:462
>>>>>>>>>>
>>>>>>>>>>         pd = 0x3fffa1420160
>>>>>>>>>>
>>>>>>>>>>         now = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         unwind_buf = {cancel_jmp_buf = {{jmp_buf =
>>>>>>>>>> {2380233324731669406, 70367199403008, 2380233324703897146, 0, 0,
>>>>>>>>>> 70367146283008, 70367154668064, 8388608, 70367199363104, 268779184,
>>>>>>>>>>
>>>>>>>>>>                 268779184, 70367199388632, 70367200820192, 3, 0,
>>>>>>>>>> 70367199388648, 70368094386080, 70368094386136, 4001536, 70367199364120,
>>>>>>>>>> 70367154665280, -3187653564,
>>>>>>>>>>
>>>>>>>>>>                 0 <repeats 42 times>}, mask_was_saved = 0}}, priv
>>>>>>>>>> = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0,
>>>>>>>>>> canceltype = 0}}}
>>>>>>>>>>
>>>>>>>>>>         not_first_call = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         pagesize_m1 = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         sp = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         freesize = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         __PRETTY_FUNCTION__ = "start_thread"
>>>>>>>>>>
>>>>>>>>>> #4  0x00003fffa3de60fc in .__clone () at
>>>>>>>>>> ../sysdeps/unix/sysv/linux/powerpc/powerpc64/clone.S:96
>>>>>>>>>>
>>>>>>>>>> No locals.
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> Thread 5 (LWP 1746):
>>>>>>>>>>
>>>>>>>>>> #0  0x00003fffa3ea7e38 in __lll_lock_wait (futex=0x100272a8,
>>>>>>>>>> private=<optimized out>) at lowlevellock.c:46
>>>>>>>>>>
>>>>>>>>>>         r4 = 128
>>>>>>>>>>
>>>>>>>>>>         r7 = 0
>>>>>>>>>>
>>>>>>>>>>         r5 = 2
>>>>>>>>>>
>>>>>>>>>>         r8 = 1
>>>>>>>>>>
>>>>>>>>>>         arg3 = 2
>>>>>>>>>>
>>>>>>>>>>         r0 = 221
>>>>>>>>>>
>>>>>>>>>>         r3 = 512
>>>>>>>>>>
>>>>>>>>>>         r6 = 0
>>>>>>>>>>
>>>>>>>>>>         arg4 = 0
>>>>>>>>>>
>>>>>>>>>>         arg1 = 268595880
>>>>>>>>>>
>>>>>>>>>>         __err = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         __ret = <optimized out>
>>>>>>>>>>
>>>>>>>>>> #1  0x00003fffa3e9ef64 in __GI___pthread_mutex_lock
>>>>>>>>>> (mutex=0x100272a8) at ../nptl/pthread_mutex_lock.c:81
>>>>>>>>>>
>>>>>>>>>>         __futex = 0x100272a8
>>>>>>>>>>
>>>>>>>>>>         __PRETTY_FUNCTION__ = "__pthread_mutex_lock"
>>>>>>>>>>
>>>>>>>>>>         type = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         id = <optimized out>
>>>>>>>>>>
>>>>>>>>>> #2  0x00003fffa3f6ce8c in _gf_msg (domain=0x3fffa4009e38 "epoll",
>>>>>>>>>> file=0x3fffa4009e28 "event-epoll.c", function=0x3fffa4009db8
>>>>>>>>>> <__FUNCTION__.8510> "event_dispatch_epoll_worker",
>>>>>>>>>>
>>>>>>>>>>     line=<optimized out>, level=<optimized out>,
>>>>>>>>>> errnum=<optimized out>, trace=<optimized out>, msgid=101190,
>>>>>>>>>> fmt=0x3fffa4009f48 "Started thread with index %d") at logging.c:2058
>>>>>>>>>>
>>>>>>>>>>         ret = <optimized out>
>>>>>>>>>>
>>>>>>>>>> ---Type <return> to continue, or q <return> to quit---
>>>>>>>>>>
>>>>>>>>>>         msgstr = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         ap = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         this = 0x3fffa402d290 <global_xlator>
>>>>>>>>>>
>>>>>>>>>>         ctx = 0x10027010
>>>>>>>>>>
>>>>>>>>>>         callstr = '\000' <repeats 4095 times>
>>>>>>>>>>
>>>>>>>>>>         passcallstr = 0
>>>>>>>>>>
>>>>>>>>>>         log_inited = 0
>>>>>>>>>>
>>>>>>>>>>         __PRETTY_FUNCTION__ = "_gf_msg"
>>>>>>>>>>
>>>>>>>>>> #3  0x00003fffa3fe265c in event_dispatch_epoll_worker
>>>>>>>>>> (data=0x3fff9802ffd0) at event-epoll.c:631
>>>>>>>>>>
>>>>>>>>>>         event = {events = 0, data = {ptr = 0x0, fd = 0, u32 = 0,
>>>>>>>>>> u64 = 0}}
>>>>>>>>>>
>>>>>>>>>>         ret = -1
>>>>>>>>>>
>>>>>>>>>>         ev_data = 0x3fff9802ffd0
>>>>>>>>>>
>>>>>>>>>>         event_pool = 0x10045bc0
>>>>>>>>>>
>>>>>>>>>>         myindex = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         timetodie = 0
>>>>>>>>>>
>>>>>>>>>>         __FUNCTION__ = "event_dispatch_epoll_worker"
>>>>>>>>>>
>>>>>>>>>> #4  0x00003fffa3e9bb30 in start_thread (arg=0x3fff9f37d160) at
>>>>>>>>>> pthread_create.c:462
>>>>>>>>>>
>>>>>>>>>>         pd = 0x3fff9f37d160
>>>>>>>>>>
>>>>>>>>>>         now = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         unwind_buf = {cancel_jmp_buf = {{jmp_buf =
>>>>>>>>>> {2380233325439331230, 70367199403008, 2380233324703897146, 0, 269006880,
>>>>>>>>>> 70367112060928, 70367120445984, 8388608, 70367199363104,
>>>>>>>>>>
>>>>>>>>>>                 70366999543760, 70367137025008, 70367199388632,
>>>>>>>>>> 70367200825640, 3, 0, 70367199388648, 70367137024656, 70367137024712,
>>>>>>>>>> 4001536, 70367199364120, 70367120443200, -3183328188,
>>>>>>>>>>
>>>>>>>>>>                 0 <repeats 42 times>}, mask_was_saved = 0}}, priv
>>>>>>>>>> = {pad = {0x0, 0x0, 0x0, 0x0}, data = {prev = 0x0, cleanup = 0x0,
>>>>>>>>>> canceltype = 0}}}
>>>>>>>>>>
>>>>>>>>>>         not_first_call = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         pagesize_m1 = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         sp = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         freesize = <optimized out>
>>>>>>>>>>
>>>>>>>>>>         __PRETTY_FUNCTION__ = "start_thread"
>>>>>>>>>> <p
>>>>>>>>>> class="m_3924698905562214407m_-746409795816116485m_5332120683958399093m_691617268217482248
>>>>>>>>>>
>>>>>>>>>

-- 
Pranith
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