Backtrace:

Thread 13 (Thread 0x7fc30b9f8700 (LWP 29918)):
#0  0x00007fc31692543c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00000000004ae899 in os_cond_wait (event=0x18edbb0, reset_sig_count=1) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/os/os0sync.c:207
#2  os_event_wait_low (event=0x18edbb0, reset_sig_count=1) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/os/os0sync.c:609
#3  0x00000000004abb79 in os_aio_simulated_handle (global_segment=9, message1=0x7fc30b9f7e68, message2=0x7fc30b9f7e60, type=0x7fc30b9f7e58, space_id=0x7fc30b9f7e50) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/os/os0file.c:5097
#4  0x0000000000474354 in fil_aio_wait (segment=9) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/fil/fil0fil.c:5701
#5  0x000000000040a018 in io_handler_thread (arg=<value optimized out>) at xtrabackup.cc:2276
#6  0x00007fc316921851 in start_thread () from /lib64/libpthread.so.0
#7  0x00007fc315ccb90d in clone () from /lib64/libc.so.6

Thread 12 (Thread 0x7fc30cdfa700 (LWP 29916)):
#0  0x00007fc31692543c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00000000004ae899 in os_cond_wait (event=0x18edab0, reset_sig_count=1) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/os/os0sync.c:207
#2  os_event_wait_low (event=0x18edab0, reset_sig_count=1) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/os/os0sync.c:609
#3  0x00000000004abb79 in os_aio_simulated_handle (global_segment=7, message1=0x7fc30cdf9e68, message2=0x7fc30cdf9e60, type=0x7fc30cdf9e58, space_id=0x7fc30cdf9e50) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/os/os0file.c:5097
#4  0x0000000000474354 in fil_aio_wait (segment=7) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/fil/fil0fil.c:5701
#5  0x000000000040a018 in io_handler_thread (arg=<value optimized out>) at xtrabackup.cc:2276
#6  0x00007fc316921851 in start_thread () from /lib64/libpthread.so.0
#7  0x00007fc315ccb90d in clone () from /lib64/libc.so.6

Thread 11 (Thread 0x7fc30aff7700 (LWP 29919)):
#0  0x00007fc3169257bb in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00000000004ae753 in os_cond_wait_timed (event=0x19054a0, time_in_usec=1000000, reset_sig_count=1) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/os/os0sync.c:171
#2  os_event_wait_time_low (event=0x19054a0, time_in_usec=1000000, reset_sig_count=1) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/os/os0sync.c:716
#3  0x000000000040c412 in log_copying_thread (arg=<value optimized out>) at xtrabackup.cc:2199
#4  0x00007fc316921851 in start_thread () from /lib64/libpthread.so.0
#5  0x00007fc315ccb90d in clone () from /lib64/libc.so.6

Thread 10 (Thread 0x7fc30e1fc700 (LWP 29914)):
#0  0x00007fc31692543c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00000000004ae899 in os_cond_wait (event=0x18ed9b0, reset_sig_count=1) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/os/os0sync.c:207
#2  os_event_wait_low (event=0x18ed9b0, reset_sig_count=1) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/os/os0sync.c:609
#3  0x00000000004abb79 in os_aio_simulated_handle (global_segment=5, message1=0x7fc30e1fbe68, message2=0x7fc30e1fbe60, type=0x7fc30e1fbe58, space_id=0x7fc30e1fbe50) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/os/os0file.c:5097
#4  0x0000000000474354 in fil_aio_wait (segment=5) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/fil/fil0fil.c:5701
#5  0x000000000040a018 in io_handler_thread (arg=<value optimized out>) at xtrabackup.cc:2276
#6  0x00007fc316921851 in start_thread () from /lib64/libpthread.so.0
#7  0x00007fc315ccb90d in clone () from /lib64/libc.so.6

Thread 9 (Thread 0x7fc30ebfd700 (LWP 29913)):
#0  0x00007fc31692543c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00000000004ae899 in os_cond_wait (event=0x18ed930, reset_sig_count=1) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/os/os0sync.c:207
#2  os_event_wait_low (event=0x18ed930, reset_sig_count=1) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/os/os0sync.c:609
#3  0x00000000004abb79 in os_aio_simulated_handle (global_segment=4, message1=0x7fc30ebfce68, message2=0x7fc30ebfce60, type=0x7fc30ebfce58, space_id=0x7fc30ebfce50) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/os/os0file.c:5097
#4  0x0000000000474354 in fil_aio_wait (segment=4) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/fil/fil0fil.c:5701
#5  0x000000000040a018 in io_handler_thread (arg=<value optimized out>) at xtrabackup.cc:2276
#6  0x00007fc316921851 in start_thread () from /lib64/libpthread.so.0
#7  0x00007fc315ccb90d in clone () from /lib64/libc.so.6

Thread 8 (Thread 0x7fc30c3f9700 (LWP 29917)):
#0  0x00007fc31692543c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00000000004ae899 in os_cond_wait (event=0x18edb30, reset_sig_count=1) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/os/os0sync.c:207
#2  os_event_wait_low (event=0x18edb30, reset_sig_count=1) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/os/os0sync.c:609
#3  0x00000000004abb79 in os_aio_simulated_handle (global_segment=8, message1=0x7fc30c3f8e68, message2=0x7fc30c3f8e60, type=0x7fc30c3f8e58, space_id=0x7fc30c3f8e50) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/os/os0file.c:5097
#4  0x0000000000474354 in fil_aio_wait (segment=8) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/fil/fil0fil.c:5701
#5  0x000000000040a018 in io_handler_thread (arg=<value optimized out>) at xtrabackup.cc:2276
#6  0x00007fc316921851 in start_thread () from /lib64/libpthread.so.0
#7  0x00007fc315ccb90d in clone () from /lib64/libc.so.6

Thread 7 (Thread 0x7fc30ffff700 (LWP 29911)):
#0  0x00007fc31692543c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00000000004ae899 in os_cond_wait (event=0x18ed830, reset_sig_count=1) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/os/os0sync.c:207
#2  os_event_wait_low (event=0x18ed830, reset_sig_count=1) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/os/os0sync.c:609
#3  0x00000000004abb79 in os_aio_simulated_handle (global_segment=2, message1=0x7fc30fffee68, message2=0x7fc30fffee60, type=0x7fc30fffee58, space_id=0x7fc30fffee50) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/os/os0file.c:5097
#4  0x0000000000474354 in fil_aio_wait (segment=2) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/fil/fil0fil.c:5701
#5  0x000000000040a018 in io_handler_thread (arg=<value optimized out>) at xtrabackup.cc:2276
#6  0x00007fc316921851 in start_thread () from /lib64/libpthread.so.0
#7  0x00007fc315ccb90d in clone () from /lib64/libc.so.6

Thread 6 (Thread 0x7fc30d7fb700 (LWP 29915)):
#0  0x00007fc31692543c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00000000004ae899 in os_cond_wait (event=0x18eda30, reset_sig_count=1) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/os/os0sync.c:207
#2  os_event_wait_low (event=0x18eda30, reset_sig_count=1) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/os/os0sync.c:609
#3  0x00000000004abb79 in os_aio_simulated_handle (global_segment=6, message1=0x7fc30d7fae68, message2=0x7fc30d7fae60, type=0x7fc30d7fae58, space_id=0x7fc30d7fae50) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/os/os0file.c:5097
#4  0x0000000000474354 in fil_aio_wait (segment=6) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/fil/fil0fil.c:5701
#5  0x000000000040a018 in io_handler_thread (arg=<value optimized out>) at xtrabackup.cc:2276
#6  0x00007fc316921851 in start_thread () from /lib64/libpthread.so.0
#7  0x00007fc315ccb90d in clone () from /lib64/libc.so.6

Thread 5 (Thread 0x7fc315be2700 (LWP 29909)):
#0  0x00007fc31692543c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00000000004ae899 in os_cond_wait (event=0x18ed730, reset_sig_count=1) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/os/os0sync.c:207
#2  os_event_wait_low (event=0x18ed730, reset_sig_count=1) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/os/os0sync.c:609
#3  0x00000000004abb79 in os_aio_simulated_handle (global_segment=0, message1=0x7fc315be1e68, message2=0x7fc315be1e60, type=0x7fc315be1e58, space_id=0x7fc315be1e50) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/os/os0file.c:5097
#4  0x0000000000474354 in fil_aio_wait (segment=0) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/fil/fil0fil.c:5701
#5  0x000000000040a018 in io_handler_thread (arg=<value optimized out>) at xtrabackup.cc:2276
#6  0x00007fc316921851 in start_thread () from /lib64/libpthread.so.0
#7  0x00007fc315ccb90d in clone () from /lib64/libc.so.6

Thread 4 (Thread 0x7fc30f5fe700 (LWP 29912)):
#0  0x00007fc31692543c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00000000004ae899 in os_cond_wait (event=0x18ed8b0, reset_sig_count=1) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/os/os0sync.c:207
#2  os_event_wait_low (event=0x18ed8b0, reset_sig_count=1) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/os/os0sync.c:609
#3  0x00000000004abb79 in os_aio_simulated_handle (global_segment=3, message1=0x7fc30f5fde68, message2=0x7fc30f5fde60, type=0x7fc30f5fde58, space_id=0x7fc30f5fde50) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/os/os0file.c:5097
#4  0x0000000000474354 in fil_aio_wait (segment=3) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/fil/fil0fil.c:5701
#5  0x000000000040a018 in io_handler_thread (arg=<value optimized out>) at xtrabackup.cc:2276
#6  0x00007fc316921851 in start_thread () from /lib64/libpthread.so.0
#7  0x00007fc315ccb90d in clone () from /lib64/libc.so.6

Thread 3 (Thread 0x7fc316f50720 (LWP 29907)):
#0  0x00007fc315c8fb8d in nanosleep () from /lib64/libc.so.6
#1  0x00007fc315cc4d64 in usleep () from /lib64/libc.so.6
#2  0x00000000004110a5 in xtrabackup_backup_func (argc=0, argv=0x18bc938) at xtrabackup.cc:3163
#3  main (argc=0, argv=0x18bc938) at xtrabackup.cc:5778

Thread 2 (Thread 0x7fc3151e1700 (LWP 29910)):
#0  0x00007fc31692543c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00000000004ae899 in os_cond_wait (event=0x18ed7b0, reset_sig_count=1) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/os/os0sync.c:207
#2  os_event_wait_low (event=0x18ed7b0, reset_sig_count=1) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/os/os0sync.c:609
#3  0x00000000004abb79 in os_aio_simulated_handle (global_segment=1, message1=0x7fc3151e0e68, message2=0x7fc3151e0e60, type=0x7fc3151e0e58, space_id=0x7fc3151e0e50) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/os/os0file.c:5097
#4  0x0000000000474354 in fil_aio_wait (segment=1) at /mnt/xb-2.1/Percona-Server-5.5/storage/innobase/fil/fil0fil.c:5701
#5  0x000000000040a018 in io_handler_thread (arg=<value optimized out>) at xtrabackup.cc:2276
#6  0x00007fc316921851 in start_thread () from /lib64/libpthread.so.0
#7  0x00007fc315ccb90d in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7fc30a5f6700 (LWP 29920)):
#0  0x00007fc315c158a5 in raise () from /lib64/libc.so.6
#1  0x00007fc315c17085 in abort () from /lib64/libc.so.6
#2  0x00000000004165f0 in xb_fil_cur_read (cursor=0x7fc30a5f56a0) at fil_cur.cc:218
#3  0x000000000040aa48 in xtrabackup_copy_datafile (node=<value optimized out>, thread_n=1) at xtrabackup.cc:1915
#4  0x000000000040ad5a in data_copy_thread_func (arg=0x1905760) at xtrabackup.cc:2316
#5  0x00007fc316921851 in start_thread () from /lib64/libpthread.so.0
#6  0x00007fc315ccb90d in clone () from /lib64/libc.so.6