lidavidm commented on pull request #12099:
URL: https://github.com/apache/arrow/pull/12099#issuecomment-1007667064
Surprisingly it is the I/O thread pool:
```
(gdb) info thread
Id Target Id Frame
* 1 Thread 0x7f8856a04740 (LWP 27248) "python" 0x00007f88565f5ad3 in
futex_wait_cancelable (private=<optimized out>,
expected=0, futex_word=0x5622ee0e97e8) at
../sysdeps/unix/sysv/linux/futex-internal.h:88
...snip...
29 Thread 0x7f879e7fc700 (LWP 27276) "Io-7" 0x00007f88565f5ad3 in
futex_wait_cancelable (private=<optimized out>,
expected=0, futex_word=0x7f87900051e0) at
../sysdeps/unix/sysv/linux/futex-internal.h:88
30 Thread 0x7f879d3ff700 (LWP 27277) "jemalloc_bg_thd"
0x00007f88565f5ad3 in futex_wait_cancelable (
private=<optimized out>, expected=0, futex_word=0x7f87cd40a794) at
../sysdeps/unix/sysv/linux/futex-internal.h:88
31 Thread 0x7f878ffff700 (LWP 27278) "jemalloc_bg_thd"
0x00007f88565f5ad3 in futex_wait_cancelable (
private=<optimized out>, expected=0, futex_word=0x7f87cd40a864) at
../sysdeps/unix/sysv/linux/futex-internal.h:88
(gdb) t 29
[Switching to thread 29 (Thread 0x7f879e7fc700 (LWP 27276))]
#0 0x00007f88565f5ad3 in futex_wait_cancelable (private=<optimized out>,
expected=0, futex_word=0x7f87900051e0)
at ../sysdeps/unix/sysv/linux/futex-internal.h:88
88 in ../sysdeps/unix/sysv/linux/futex-internal.h
(gdb) bt
#0 0x00007f88565f5ad3 in futex_wait_cancelable (private=<optimized out>,
expected=0, futex_word=0x7f87900051e0)
at ../sysdeps/unix/sysv/linux/futex-internal.h:88
#1 __pthread_cond_wait_common (abstime=0x0, mutex=0x7f8790005190,
cond=0x7f87900051b8) at pthread_cond_wait.c:502
#2 __pthread_cond_wait (cond=0x7f87900051b8, mutex=0x7f8790005190) at
pthread_cond_wait.c:655
#3 0x00007f87cdd374ad in __gthread_cond_wait (
__mutex=<error reading variable: dwarf2_find_location_expression:
Corrupted DWARF expression.>,
__cond=<optimized out>)
at
/home/conda/feedstock_root/build_artifacts/gcc_compilers_1628138005912/work/build/x86_64-conda-linux-gnu/libstdc++-v3/src/c++11/condition_variable.cc:865
#4 std::__condvar::wait (__m=<error reading variable:
dwarf2_find_location_expression: Corrupted DWARF expression.>,
this=<optimized out>) at
../../../../../libstdc++-v3/src/c++11/gthr-default.h:155
#5 std::condition_variable::wait (this=<optimized out>, __lock=...)
at ../../../../../libstdc++-v3/src/c++11/condition_variable.cc:41
#6 0x00007f87d1420c11 in
std::condition_variable::wait<arrow::fs::(anonymous
namespace)::ObjectOutputStream::Flush()::{lambda()#1}>(std::unique_lock<std::mutex>&,
arrow::fs::(anonymous namespace)::ObjectOutputStream::Flush()::{lambda()#1}) (
this=0x7f87900051b8, __lock=..., __p=...)
at
/usr/lib/gcc/x86_64-linux-gnu/7.5.0/../../../../include/c++/7.5.0/condition_variable:99
#7 0x00007f87d141ba1e in arrow::fs::(anonymous
namespace)::ObjectOutputStream::Flush (this=0x7f879000add0)
at
/home/lidavidm/Code/upstream/arrow-15265/cpp/src/arrow/filesystem/s3fs.cc:1301
#8 0x00007f87d141bfe0 in arrow::fs::(anonymous
namespace)::ObjectOutputStream::Close (this=0x7f879000add0)
at
/home/lidavidm/Code/upstream/arrow-15265/cpp/src/arrow/filesystem/s3fs.cc:1218
#9 0x00007f87d141c66d in virtual thunk to arrow::fs::(anonymous
namespace)::ObjectOutputStream::Close() ()
at
/usr/lib/gcc/x86_64-linux-gnu/7.5.0/../../../../include/c++/7.5.0/bits/hashtable.h:492
#10 0x00007f87c7d7d907 in arrow::dataset::FileWriter::Finish
(this=0x7f8788007d80)
at
/home/lidavidm/Code/upstream/arrow-15265/cpp/src/arrow/dataset/file_base.cc:322
#11 0x00007f87c7d59040 in arrow::dataset::internal::(anonymous
namespace)::DatasetWriterFileQueue::DoFinish (
this=0x7f87b000b5f0) at
/home/lidavidm/Code/upstream/arrow-15265/cpp/src/arrow/dataset/dataset_writer.cc:221
#12 0x00007f87c7d58ee6 in arrow::dataset::internal::(anonymous
namespace)::DatasetWriterFileQueue::DoDestroy()::{lambda()#1}::operator()()
const (this=0x7f87b00088c8)
```
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