Re: [Starpu-devel] [LU factorisation: gdb debug output]

[Maxim Abalenkov <maxim.abalenkov@gmail.com>]

Hello Samuel,

Please find the full gdb backtrace attached.

—

Best wishes,

Maxim

(gdb) thread apply all bt full

Thread 5 (Thread 0x7fffedcdc700 (LWP 27645)):
#0  0x00007ffff31ca860 in raise () from /usr/lib/libc.so.6
No symbol table info available.
#1  0x00007ffff31cbec9 in abort () from /usr/lib/libc.so.6
No symbol table info available.
#2  0x00007ffff31c30bc in __assert_fail_base () from /usr/lib/libc.so.6
No symbol table info available.
#3  0x00007ffff31c3133 in __assert_fail () from /usr/lib/libc.so.6
No symbol table info available.
#4  0x00007ffff73bfafd in _starpu_create_data_request (handle=0x555555a1af00, 
src_replicate=0x555555a1aff8, dst_replicate=0x555555a1b040, handling_node=1, 
mode=STARPU_W, ndeps=0, is_prefetch=0, 
    is_write_invalidation=0) at datawizard/data_request.c:150
        r = 0x7fffd8000f60
        __PRETTY_FUNCTION__ = "_starpu_create_data_request"
        __func__ = "_starpu_create_data_request"
#5  0x00007ffff73bbfff in _starpu_create_request_to_fetch_data 
(handle=0x555555a1af00, dst_replicate=0x555555a1b040, mode=STARPU_W, 
is_prefetch=0, async=0, callback_func=0x0, callback_arg=0x0)
    at datawizard/coherency.c:634
        hop_dst_node = 1
        hop_dst_replicate = 0x555555a1b040
        r = 0x0
        hop_src_node = 0
        hop_handling_node = 1
        hop_src_replicate = 0x555555a1aff8
        ndeps = 0
        requesting_node = 1
        nwait = 0
        __func__ = "_starpu_create_request_to_fetch_data"
        __PRETTY_FUNCTION__ = "_starpu_create_request_to_fetch_data"
        src_node = -1
        src_nodes = {0, 32767, 0, 0}
        dst_nodes = {1, 0, 3989681248, 32767}
        handling_nodes = {1, 32767, 4294941599, 32767}
        write_invalidation = 0
        nhops = 1
        requests = {0x0}
        reused_requests = {0}
        hop = 0
#6  0x00007ffff73bc751 in _starpu_fetch_data_on_node (handle=0x555555a1af00, 
node=1, dst_replicate=0x555555a1b040, mode=STARPU_W, detached=0, 
is_prefetch=0, async=0, callback_func=0x0, callback_arg=0x0)
    at datawizard/coherency.c:754
        local_node = 0
        cpt = 0
        __func__ = "_starpu_fetch_data_on_node"
        r = 0x0
        ret = 0
#7  0x00007ffff73bc8eb in fetch_data (handle=0x555555a1af00, node=1, 
replicate=0x555555a1b040, mode=STARPU_W) at datawizard/coherency.c:782
No locals.
#8  0x00007ffff73bd75e in _starpu_fetch_task_input (j=0x555555a5ecd0) at 
datawizard/coherency.c:972
        ret = 0
        handle = 0x555555a1af00
        node = 1
        local_replicate = 0x555555a1b040
        mode = STARPU_W
        profiling = 0
        task = 0x555555a5e050
        descrs = 0x555555a5efe0
        nbuffers = 72
---Type <return> to continue, or q <return> to quit---
        local_memory_node = 0
        workerid = 3
        index = 7
        __func__ = "_starpu_fetch_task_input"
        __PRETTY_FUNCTION__ = "_starpu_fetch_task_input"
        index2 = 4148450603
#9  0x00007ffff744197c in execute_job_on_cpu (j=0x555555a5ecd0, 
worker_task=0x555555a5e050, cpu_args=0x7ffff76d0df8 <_starpu_config+4440>, 
rank=0, perf_arch=0x7ffff76d0e40 <_starpu_config+4512>)
    at drivers/cpu/driver_cpu.c:71
        ret = 1436810496
        is_parallel_task = 0
        profiling = 0
        task = 0x555555a5e050
        cl = 0x7ffff7a7c380 <starpu_codelet_switch>
        continuation_wake_up = 0
        __PRETTY_FUNCTION__ = "execute_job_on_cpu"
        __func__ = "execute_job_on_cpu"
#10 0x00007ffff744282e in _starpu_cpu_driver_run_once 
(cpu_worker=0x7ffff76d0df8 <_starpu_config+4440>) at 
drivers/cpu/driver_cpu.c:300
        memnode = 0
        workerid = 3
        j = 0x555555a5ecd0
        task = 0x555555a5e050
        res = 0
        rank = 0
        is_parallel_task = 0
        perf_arch = 0x7ffff76d0e40 <_starpu_config+4512>
        __func__ = "_starpu_cpu_driver_run_once"
        __PRETTY_FUNCTION__ = "_starpu_cpu_driver_run_once"
#11 0x00007ffff74429ef in _starpu_cpu_worker (arg=0x7ffff76d0df8 
<_starpu_config+4440>) at drivers/cpu/driver_cpu.c:361
        args = 0x7ffff76d0df8 <_starpu_config+4440>
#12 0x00007ffff355508a in start_thread () from /usr/lib/libpthread.so.0
No symbol table info available.
#13 0x00007ffff328c42f in clone () from /usr/lib/libc.so.6
No symbol table info available.

Thread 4 (Thread 0x7fffee4dd700 (LWP 27644)):
#0  0x00007ffff73b6213 in _starpu_exponential_backoff (worker=0x7ffff76d09d0 
<_starpu_config+3376>) at drivers/driver_common/driver_common.c:328
        delay = 15
#1  0x00007ffff73b7632 in _starpu_get_worker_task (worker=0x7ffff76d09d0 
<_starpu_config+3376>, workerid=2, memnode=0) at 
drivers/driver_common/driver_common.c:436
        __func__ = "_starpu_get_worker_task"
        task = 0x0
        needed = 0
        executing = 0
#2  0x00007ffff744237a in _starpu_cpu_driver_run_once 
(cpu_worker=0x7ffff76d09d0 <_starpu_config+3376>) at 
drivers/cpu/driver_cpu.c:243
        memnode = 0
        workerid = 2
        j = 0x555555a5dd40
        task = 0x0
        res = 0
        rank = 0
        is_parallel_task = 0
        perf_arch = 0x7ffff76d0a18 <_starpu_config+3448>
        __func__ = "_starpu_cpu_driver_run_once"
        __PRETTY_FUNCTION__ = "_starpu_cpu_driver_run_once"
#3  0x00007ffff74429ef in _starpu_cpu_worker (arg=0x7ffff76d09d0 
<_starpu_config+3376>) at drivers/cpu/driver_cpu.c:361
        args = 0x7ffff76d09d0 <_starpu_config+3376>
#4  0x00007ffff355508a in start_thread () from /usr/lib/libpthread.so.0
---Type <return> to continue, or q <return> to quit---
No symbol table info available.
#5  0x00007ffff328c42f in clone () from /usr/lib/libc.so.6
No symbol table info available.

Thread 3 (Thread 0x7fffeecde700 (LWP 27643)):
#0  0x00007ffff73b6213 in _starpu_exponential_backoff (worker=0x7ffff76d05a8 
<_starpu_config+2312>) at drivers/driver_common/driver_common.c:328
        delay = 5
#1  0x00007ffff73b7632 in _starpu_get_worker_task (worker=0x7ffff76d05a8 
<_starpu_config+2312>, workerid=1, memnode=0) at 
drivers/driver_common/driver_common.c:436
        __func__ = "_starpu_get_worker_task"
        task = 0x0
        needed = 0
        executing = 0
#2  0x00007ffff744237a in _starpu_cpu_driver_run_once 
(cpu_worker=0x7ffff76d05a8 <_starpu_config+2312>) at 
drivers/cpu/driver_cpu.c:243
        memnode = 0
        workerid = 1
        j = 0x555555a5be30
        task = 0x0
        res = 0
        rank = 0
        is_parallel_task = 0
        perf_arch = 0x7ffff76d05f0 <_starpu_config+2384>
        __func__ = "_starpu_cpu_driver_run_once"
        __PRETTY_FUNCTION__ = "_starpu_cpu_driver_run_once"
#3  0x00007ffff74429ef in _starpu_cpu_worker (arg=0x7ffff76d05a8 
<_starpu_config+2312>) at drivers/cpu/driver_cpu.c:361
        args = 0x7ffff76d05a8 <_starpu_config+2312>
#4  0x00007ffff355508a in start_thread () from /usr/lib/libpthread.so.0
No symbol table info available.
#5  0x00007ffff328c42f in clone () from /usr/lib/libc.so.6
No symbol table info available.

Thread 2 (Thread 0x7fffef4df700 (LWP 27642)):
#0  0x00007ffff73b6213 in _starpu_exponential_backoff (worker=0x7ffff76d0180 
<_starpu_config+1248>) at drivers/driver_common/driver_common.c:328
        delay = 13
#1  0x00007ffff73b7632 in _starpu_get_worker_task (worker=0x7ffff76d0180 
<_starpu_config+1248>, workerid=0, memnode=0) at 
drivers/driver_common/driver_common.c:436
        __func__ = "_starpu_get_worker_task"
        task = 0x0
        needed = 0
        executing = 0
#2  0x00007ffff744237a in _starpu_cpu_driver_run_once 
(cpu_worker=0x7ffff76d0180 <_starpu_config+1248>) at 
drivers/cpu/driver_cpu.c:243
        memnode = 0
        workerid = 0
        j = 0x555555a5a4b0
        task = 0x0
        res = 0
        rank = 0
        is_parallel_task = 0
        perf_arch = 0x7ffff76d01c8 <_starpu_config+1320>
        __func__ = "_starpu_cpu_driver_run_once"
        __PRETTY_FUNCTION__ = "_starpu_cpu_driver_run_once"
#3  0x00007ffff74429ef in _starpu_cpu_worker (arg=0x7ffff76d0180 
<_starpu_config+1248>) at drivers/cpu/driver_cpu.c:361
        args = 0x7ffff76d0180 <_starpu_config+1248>
#4  0x00007ffff355508a in start_thread () from /usr/lib/libpthread.so.0
No symbol table info available.
#5  0x00007ffff328c42f in clone () from /usr/lib/libc.so.6
No symbol table info available.

---Type <return> to continue, or q <return> to quit---
Thread 1 (Thread 0x7ffff7fa6c00 (LWP 27638)):
#0  0x00007ffff355b38d in pthread_cond_wait@@GLIBC_2.3.2 () from 
/usr/lib/libpthread.so.0
No symbol table info available.
#1  0x00007ffff734395f in _starpu_barrier_counter_wait_for_empty_counter 
(barrier_c=0x7ffff76e7b60 <_starpu_config+97984>) at 
common/barrier_counter.c:44
        p_ret = 0
        barrier = 0x7ffff76e7b60 <_starpu_config+97984>
        ret = 112
        __func__ = "_starpu_barrier_counter_wait_for_empty_counter"
#2  0x00007ffff739bd5f in _starpu_wait_for_all_tasks_of_sched_ctx 
(sched_ctx_id=0) at core/sched_ctx.c:1312
        sched_ctx = 0x7ffff76e7b30 <_starpu_config+97936>
        __func__ = "_starpu_wait_for_all_tasks_of_sched_ctx"
        __PRETTY_FUNCTION__ = "_starpu_wait_for_all_tasks_of_sched_ctx"
#3  0x00007ffff7356039 in 
_starpu_task_wait_for_all_in_ctx_and_return_nb_waited_tasks (sched_ctx=0) at 
core/task.c:887
        ret = 0
#4  0x00007ffff7355fc8 in 
_starpu_task_wait_for_all_and_return_nb_waited_tasks () at core/task.c:874
        nsched_ctxs = 1
        sched_ctx_id = 0
        __func__ = "_starpu_task_wait_for_all_and_return_nb_waited_tasks"
        __PRETTY_FUNCTION__ = 
"_starpu_task_wait_for_all_and_return_nb_waited_tasks"
#5  0x00007ffff7355ffa in starpu_task_wait_for_all () at core/task.c:880
No locals.
#6  0x00007ffff7b5a150 in plasma_zgetrf (m=16, n=16, pA=0x555555a19bd0, 
lda=16, iPiv=0x555555a13eb0) at compute/zgetrf.c:152
        plasma = 0x555555a05b50
        __func__ = "plasma_zgetrf"
        nb = 2
        A = {type = 123, uplo = 0, precision = 5, matrix = 0x555555a2e0e0, 
A21 = 256, A12 = 256, A22 = 256, mb = 2, nb = 2, gm = 16, gn = 16, gmt = 8, 
gnt = 8, i = 0, j = 0, m = 16, n = 16, mt = 8, 
          nt = 8, kl = 15, ku = 15, klt = 8, kut = 8, panel_handles = 
0x555555a13dd0, tile_handles = 0x555555a09030}
        retval = 0
        hPiv = 0x555555a3fd00
        sequence = {status = 0, request = 0x0}
        request = {status = 0}
#7  0x000055555557d2f1 in test_zgetrf (param=0x7fffffffa5d0, run=true) at 
test/test_zgetrf.c:122
        m = 16
        n = 16
        lda = 16
        test = 1
        tol = 5.5511151231257827e-15
        A = 0x555555a19bd0
        __PRETTY_FUNCTION__ = "test_zgetrf"
        ipiv = 0x555555a13eb0
        seed = {2964, 3539, 229, 2049}
        retval = 0
        zerocol = -1
        Aref = 0x555555a1b8f0
        start = 70251.718753652996
        plainfo = 0
        stop = 0
        time = 0
#8  0x0000555555574c43 in run_routine (name=0x7fffffffb05c "zgetrf", 
pval=0x7fffffffa5d0, run=true) at test/test.c:501
        i = 12
        found = false
#9  0x00005555555746a3 in test_routine (name=0x7fffffffb05c "zgetrf", 
pval=0x7fffffffa5d0, test=true) at test/test.c:397
        __PRETTY_FUNCTION__ = "test_routine"
#10 0x0000555555574225 in main (argc=5, argv=0x7fffffffad28) at 
test/test.c:250
        i = 0
        routine = 0x7fffffffb05c "zgetrf"
---Type <return> to continue, or q <return> to quit---
        param = {{is_list = false, num = 0, pos = 0, size = 1024, val = 
0x555555869920}, {is_list = false, num = 0, pos = 0, size = 1024, val = 
0x555555875930}, {is_list = false, num = 0, pos = 0, 
            size = 1024, val = 0x555555881940}, {is_list = false, num = 0, 
pos = 0, size = 1024, val = 0x55555588d950}, {is_list = false, num = 0, pos = 
0, size = 1024, val = 0x555555899960}, {
            is_list = false, num = 0, pos = 0, size = 1024, val = 
0x5555558a5970}, {is_list = false, num = 0, pos = 0, size = 1024, val = 
0x5555558b1980}, {is_list = false, num = 0, pos = 0, 
            size = 1024, val = 0x5555558bd990}, {is_list = false, num = 0, 
pos = 0, size = 1024, val = 0x5555558c99a0}, {is_list = false, num = 0, pos = 
0, size = 1024, val = 0x5555558d59b0}, {
            is_list = false, num = 0, pos = 0, size = 1024, val = 
0x5555558e19c0}, {is_list = true, num = 1, pos = 0, size = 1024, val = 
0x5555558ed9d0}, {is_list = true, num = 1, pos = 0, size = 1024, 
            val = 0x5555558f99e0}, {is_list = true, num = 1, pos = 0, size = 
1024, val = 0x5555559059f0}, {is_list = true, num = 1, pos = 0, size = 1024, 
val = 0x555555911a00}, {is_list = true, num = 1, 
            pos = 0, size = 1024, val = 0x55555591da10}, {is_list = true, num 
= 1, pos = 0, size = 1024, val = 0x555555929a20}, {is_list = true, num = 1, 
pos = 0, size = 1024, val = 0x555555935a30}, {
            is_list = true, num = 1, pos = 0, size = 1024, val = 
0x555555941a40}, {is_list = true, num = 1, pos = 0, size = 1024, val = 
0x55555594da50}, {is_list = true, num = 1, pos = 0, size = 1024, 
            val = 0x555555959a60}, {is_list = true, num = 1, pos = 0, size = 
1024, val = 0x555555965a70}, {is_list = true, num = 1, pos = 0, size = 1024, 
val = 0x555555971a80}, {is_list = true, num = 1, 
            pos = 0, size = 1024, val = 0x55555597da90}, {is_list = true, num 
= 1, pos = 0, size = 1024, val = 0x555555989aa0}, {is_list = true, num = 1, 
pos = 0, size = 1024, val = 0x555555995ab0}, {
            is_list = true, num = 1, pos = 0, size = 1024, val = 
0x5555559a1ac0}, {is_list = true, num = 1, pos = 0, size = 1024, val = 
0x5555559adad0}, {is_list = true, num = 1, pos = 0, size = 1024, 
            val = 0x5555559b9ae0}, {is_list = true, num = 1, pos = 0, size = 
1024, val = 0x5555559c5af0}, {is_list = true, num = 1, pos = 0, size = 1024, 
val = 0x5555559d1b00}, {is_list = true, num = 1, 
            pos = 0, size = 1024, val = 0x5555559ddb10}, {is_list = true, num 
= 1, pos = 0, size = 1024, val = 0x5555559e9b20}, {is_list = true, num = 1, 
pos = 0, size = 1024, val = 0x5555559f5b30}}
        pval = {{i = 2147483647, c = 0 '\000', d = 0, z = 
1.8280428896126122e-322 + 4.9406564584124654e-324 * I, dim = {m = 772014104, 
n = 67108864, k = 9}, used = 1}, {i = 0, c = 0 '\000', d = 0, 
            z = 0 + 0 * I, dim = {m = 0, n = 0, k = 0}, used = 1}, {i = 0, c 
= 0 '\000', d = 0, z = 0 + 0 * I, dim = {m = 0, n = 0, k = 0}, used = 0}, {i 
= 0, c = 0 '\000', d = 0, z = 0 + 0 * I, dim = {
              m = 0, n = 0, k = 0}, used = 1}, {i = 0, c = 0 '\000', d = 0, z 
= 0 + 0 * I, dim = {m = 0, n = 0, k = 0}, used = 1}, {i = 0, c = 0 '\000', d 
= 0, z = 0 + 0 * I, dim = {m = 0, n = 0, 
              k = 0}, used = 0}, {i = 1, c = 0 '\000', d = 0, z = 0 + 0 * I, 
dim = {m = 0, n = 0, k = 0}, used = 0}, {i = 0, c = 121 'y', d = 0, z = 0 + 0 
* I, dim = {m = 0, n = 0, k = 0}, used = 0}, {
            i = 0, c = 110 'n', d = 0, z = 0 + 0 * I, dim = {m = 0, n = 0, k 
= 0}, used = 0}, {i = 0, c = 121 'y', d = 0, z = 0 + 0 * I, dim = {m = 0, n = 
0, k = 0}, used = 0}, {i = 0, c = 0 '\000', 
            d = 50, z = 0 + 0 * I, dim = {m = 0, n = 0, k = 0}, used = 0}, {i 
= 0, c = 99 'c', d = 0, z = 0 + 0 * I, dim = {m = 0, n = 0, k = 0}, used = 
0}, {i = 0, c = 111 'o', d = 0, z = 0 + 0 * I, 
            dim = {m = 0, n = 0, k = 0}, used = 0}, {i = 0, c = 110 'n', d = 
0, z = 0 + 0 * I, dim = {m = 0, n = 0, k = 0}, used = 0}, {i = 0, c = 110 
'n', d = 0, z = 0 + 0 * I, dim = {m = 0, n = 0, 
              k = 0}, used = 0}, {i = 0, c = 110 'n', d = 0, z = 0 + 0 * I, 
dim = {m = 0, n = 0, k = 0}, used = 0}, {i = 0, c = 108 'l', d = 0, z = 0 + 0 
* I, dim = {m = 0, n = 0, k = 0}, used = 0}, {
            i = 0, c = 108 'l', d = 0, z = 0 + 0 * I, dim = {m = 0, n = 0, k 
= 0}, used = 0}, {i = 0, c = 110 'n', d = 0, z = 0 + 0 * I, dim = {m = 0, n = 
0, k = 0}, used = 0}, {i = 0, c = 102 'f', 
            d = 0, z = 0 + 0 * I, dim = {m = 0, n = 0, k = 0}, used = 0}, {i 
= 0, c = 0 '\000', d = 0, z = 0 + 0 * I, dim = {m = 16, n = 16, k = 16}, used 
= 3}, {i = 200, c = 0 '\000', d = 0, 
            z = 0 + 0 * I, dim = {m = 0, n = 0, k = 0}, used = 0}, {i = 200, 
c = 0 '\000', d = 0, z = 0 + 0 * I, dim = {m = 0, n = 0, k = 0}, used = 0}, 
{i = 1000, c = 0 '\000', d = 0, z = 0 + 0 * I, 
            dim = {m = 0, n = 0, k = 0}, used = 0}, {i = 2, c = 0 '\000', d = 
0, z = 0 + 0 * I, dim = {m = 0, n = 0, k = 0}, used = 1}, {i = 2, c = 0 
'\000', d = 0, z = 0 + 0 * I, dim = {m = 0, n = 0, 
              k = 0}, used = 1}, {i = 0, c = 0 '\000', d = 0, z = 
1.2344999999999999 + 2.3456000000000001 * I, dim = {m = 0, n = 0, k = 0}, 
used = 0}, {i = 0, c = 0 '\000', d = 0, 
            z = 6.7889999999999997 + 7.8901000000000003 * I, dim = {m = 0, n 
= 0, k = 0}, used = 0}, {i = 0, c = 0 '\000', d = 0, z = 0 + 0 * I, dim = {m 
= 0, n = 0, k = 0}, used = 1}, {i = 0, 
            c = 0 '\000', d = 0, z = 0 + 0 * I, dim = {m = 0, n = 0, k = 0}, 
used = 0}, {i = 0, c = 0 '\000', d = 0, z = 0 + 0 * I, dim = {m = 0, n = 0, k 
= 0}, used = 0}, {i = 1, c = 0 '\000', d = 0, 
            z = 0 + 0 * I, dim = {m = 0, n = 0, k = 0}, used = 1}, {i = -1, c 
= 0 '\000', d = 0, z = 0 + 0 * I, dim = {m = 0, n = 0, k = 0}, used = 1}, {i 
= 1, c = 0 '\000', d = 0, z = 0 + 0 * I, dim = {
              m = 0, n = 0, k = 0}, used = 0}}
        iter = 1
        outer = true
        test = true
        err = 0

Maxim Abalenkov \\ maxim.abalenkov@gmail.com
+44 7 486 486 505 \\ http://mabalenk.gitlab.io

On 20 Dec 2017, at 14:35, Samuel Thibault <samuel.thibault@inria.fr> wrote:

Maxim Abalenkov, on mer. 20 déc. 2017 14:30:11 +0100, wrote:

Below is the output of “starpu_machine_display”:

StarPU has found :
4 CPU threads
CPU 0
CPU 1
CPU 2
CPU 3
0 CUDA devices
0 OpenCL devices

topology ... (hwloc logical indexes)
pack 0 core 0 PU 0 CPU 0
PU 1
core 1 PU 2 CPU 1
PU 3
core 2 PU 4 CPU 2
PU 5
core 3 PU 6 CPU 3
PU 7

bandwidth and latency ...
from/to RAM
RAM 0

RAM 0

Ok, so there is no reason why node is 1 in your backtrace.
Are you using the nodes or dyn_nodes field in the codelet structure?

Within

Thread 2 (Thread 0x7fffef4df700 (LWP 11305)):
#0  0x00007ffff31ca860 in raise () from /usr/lib/libc.so.6
#1  0x00007ffff31cbec9 in abort () from /usr/lib/libc.so.6
#2  0x00007ffff31c30bc in __assert_fail_base () from /usr/lib/libc.so.6
#3  0x00007ffff31c3133 in __assert_fail () from /usr/lib/libc.so.6
#4  0x00007ffff73bfafd in _starpu_create_data_request (handle=0x555555a2f750, src_replicate=0x555555a2f848, dst_replicate=0x555555a2f890, handling_node=1, mode=STARPU_W, ndeps=0, is_prefetch=0,
   is_write_invalidation=0) at datawizard/data_request.c:150
#5  0x00007ffff73bbfff in _starpu_create_request_to_fetch_data (handle=0x555555a2f750, dst_replicate=0x555555a2f890, mode=STARPU_W, is_prefetch=0, async=0, callback_func=0x0, callback_arg=0x0)
   at datawizard/coherency.c:634
#6  0x00007ffff73bc751 in _starpu_fetch_data_on_node (handle=0x555555a2f750, node=1, dst_replicate=0x555555a2f890, mode=STARPU_W, detached=0, is_prefetch=0, async=0, callback_func=0x0, callback_arg=0x0)
   at datawizard/coherency.c:754
#7  0x00007ffff73bc8eb in fetch_data (handle=0x555555a2f750, node=1, replicate=0x555555a2f890, mode=STARPU_W) at datawizard/coherency.c:782
#8  0x00007ffff73bd75e in _starpu_fetch_task_input (j=0x555555a5e580) at datawizard/coherency.c:972
#9  0x00007ffff744197c in execute_job_on_cpu (j=0x555555a5e580, worker_task=0x555555a5d900, cpu_args=0x7ffff76d0180 <_starpu_config+1248>, rank=0, perf_arch=0x7ffff76d01c8 <_starpu_config+1320>)

it would be useful to run

gdb> thread 2
gdb> frame 8
gdb> print node
gdb> print local_memory_node
gdb> print descrs[index].node

to make sure where this bogus node is coming from.

Samuel