[lttng-dev] LTTng: problem with lttng-sessiond.

[Henrik Hautakoski]

After running a gdb backtrace. the problem was that the function
_uatomic_add_return() in urcu/uatomic.h was passed a length of 8.
But urcu was compiled for length 4 (32bit).

The source of the problem was that the `current` member in `struct
state` in lttng-tools/.../lttng-sessiond/health.h
the size of this datatype is later passed to _uatomic_add_return().
But the type was uint64_t undependant of arch.

Commit 139ac87245fd1ca18d60a0efca32b50e4c1d8730 in lttng-tools fixed
this issue. Thanks ;)
( And we started crosscompiling one day before this patch was commited :/ )

On Mon, Aug 13, 2012 at 10:51 PM, David Goulet <dgoulet at efficios.com> wrote:
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> Oh my! This is a good one haha!
>
> So, first of all, I think a gdb backtrace would be useful to know
> exactly where there is an illegal instruction.
>
> Also, on which arch and OS version are you running this.
>
> Thanks!
> David
>
> Mathieu Desnoyers:
>> CCing David Goulet, maintainer of lttng-tools. He will look into
>> your issue.
>>
>> Thanks,
>>
>> Mathieu
>>
>> * Henrik Hautakoski (henrik at fiktivkod.org) wrote:
>>> Hi, We have some problems with spawning a session daemon. running
>>> the command "lttng-sessiond --vvv --no-kernel" and get "Illegal
>>> instruction" See output:
>>>
>>> DEBUG3: Creating LTTng run directory: /var/run/lttng [in
>>> create_lttng_rundir() at main.c:5323] DEBUG2: Kernel consumer err
>>> path: /var/run/lttng/kconsumerd/error [in main() at main.c:5571]
>>> DEBUG2: Kernel consumer cmd path:
>>> /var/run/lttng/kconsumerd/command [in main() at main.c:5573]
>>> DEBUG1: Client socket path /var/run/lttng/client-lttng-sessiond
>>> [in main() at main.c:5626] DEBUG1: Application socket path
>>> /var/run/lttng/apps-lttng-sessiond [in main() at main.c:5627]
>>> DEBUG1: LTTng run directory path: /var/run/lttng [in main() at
>>> main.c:5628] DEBUG2: UST consumer 32 bits err path:
>>> /var/run/lttng/ustconsumerd32/error [in main() at main.c:5637]
>>> DEBUG2: UST consumer 32 bits cmd path:
>>> /var/run/lttng/ustconsumerd32/command [in main() at main.c:5639]
>>> DEBUG2: UST consumer 64 bits err path:
>>> /var/run/lttng/ustconsumerd64/error [in main() at main.c:5648]
>>> DEBUG2: UST consumer 64 bits cmd path:
>>> /var/run/lttng/ustconsumerd64/command [in main() at main.c:5650]
>>> DEBUG3: Created hashtable size 4 at 0x10064080 of type 1 [in
>>> lttng_ht_new() at hashtable.c:96] DEBUG3: Created hashtable size
>>> 4 at 0x10064168 of type 1 [in lttng_ht_new() at hashtable.c:96]
>>> DEBUG2: Creating consumer directory: /var/run/lttng/kconsumerd
>>> [in set_consumer_sockets() at main.c:5365] DEBUG2: Creating
>>> consumer directory: /var/run/lttng/ustconsumerd64 [in
>>> set_consumer_sockets() at main.c:5365] DEBUG2: Creating consumer
>>> directory: /var/run/lttng/ustconsumerd32 [in
>>> set_consumer_sockets() at main.c:5365] DEBUG1: Signal handler set
>>> for SIGTERM, SIGPIPE and SIGINT [in set_signal_handler() at
>>> main.c:5457] DEBUG1: All permissions are set [in
>>> set_permissions() at main.c:5310] DEBUG1: epoll set max size is
>>> 180337 [in compat_epoll_set_max_size() at compat-epoll.c:224]
>>> Illegal instruction
>>>
>>> What to do? :P
>>>
>>> -- Henrik Hautakoski henrik at fiktivkod.org
>>
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-- 
Henrik Hautakoski
henrik at fiktivkod.org