Looks like it is unaligned i/o on log file
Backtrace: (gdb) bt #0 _os_file_read (file=12, buf=0x7fffa8966010, offset=2048, offset_high=0, n=65536, trx=0x0) at os/os0file.c:2525 #1 0x0000000000865fc0 in os_aio (type=10, mode=24, name=0x3a948b8 "./ib_logfile0", file=12, buf=0x7fffa8966010, offset=2048, offset_high=0, n=65536, message1=0x3a947b8, message2=0x0, space_id=4294967280, trx=0x0) at os/os0file.c:3823 #2 0x0000000000935d58 in _fil_io (type=10, sync=1, space_id=4294967280, zip_size=0, block_offset=0, byte_offset=2048, len=65536, buf=0x7fffa8966010, message=0x0, trx=0x0) at fil/fil0fil.c:5341 #3 0x0000000000853f7b in log_group_read_log_seg (type=98887331, buf=0x7fffa8966010 "", group=0x3a94948, start_lsn=8192, end_lsn=73728) at log/log0log.c:2326 #4 0x0000000000856504 in log_online_follow_log_seg (group=0x3a94948, block_start_lsn=8192, block_end_lsn=73728) at log/log0online.c:973 #5 0x0000000000856697 in log_online_follow_log_group (group=0x3a94948, contiguous_lsn=8192) at log/log0online.c:1042 #6 0x0000000000856ba9 in log_online_follow_redo_log () at log/log0online.c:1212 #7 0x00000000008b514d in srv_redo_log_follow_thread (arg=0x0) at srv/srv0srv.c:2751 #8 0x000000391b007851 in start_thread () from /lib64/libpthread.so.0 #9 0x000000391a8e811d in clone () from /lib64/libc.so.6
Looks like it is unaligned i/o on log file
Backtrace: 4294967280, trx=0x0) at os/os0file.c:3823 4294967280, zip_size=0, block_offset=0, byte_offset=2048, len=65536, buf=0x7fffa8966010, message=0x0, trx=0x0) at fil/fil0fil.c:5341 read_log_ seg (type=98887331, buf=0x7fffa8966010 "", group=0x3a94948, start_lsn=8192, end_lsn=73728) at log/log0log.c:2326 follow_ log_seg (group=0x3a94948, block_start_ lsn=8192, block_end_ lsn=73728) at log/log0online. c:973 follow_ log_group (group=0x3a94948, contiguous_ lsn=8192) at log/log0online. c:1042 follow_ redo_log () at log/log0online. c:1212 log_follow_ thread (arg=0x0) at srv/srv0srv.c:2751 libpthread. so.0
(gdb) bt
#0 _os_file_read (file=12, buf=0x7fffa8966010, offset=2048, offset_high=0, n=65536, trx=0x0) at os/os0file.c:2525
#1 0x0000000000865fc0 in os_aio (type=10, mode=24, name=0x3a948b8 "./ib_logfile0", file=12, buf=0x7fffa8966010, offset=2048, offset_high=0, n=65536, message1=0x3a947b8, message2=0x0, space_id=
#2 0x0000000000935d58 in _fil_io (type=10, sync=1, space_id=
#3 0x0000000000853f7b in log_group_
#4 0x0000000000856504 in log_online_
#5 0x0000000000856697 in log_online_
#6 0x0000000000856ba9 in log_online_
#7 0x00000000008b514d in srv_redo_
#8 0x000000391b007851 in start_thread () from /lib64/
#9 0x000000391a8e811d in clone () from /lib64/libc.so.6