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Thread 111 (Thread 0x7f2bc9e5f700 (LWP 9379)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:216
#1  0x00007f2bcd1df4f1 in cv_timedwait (cv=0x7f2bcd54d200, mp=0x7f2bcd54d1c0, abstime=27179666) at ../../lib/libzpool/kernel.c:481
#2  0x00007f2bcd1ec900 in arc_adapt_thread () at ../../module/zfs/arc.c:2215
#3  0x00007f2bcd1db3b2 in zk_thread_helper (arg=0x151c540) at ../../lib/libzpool/kernel.c:135
#4  0x00007f2bcc93bb50 in start_thread (arg=<optimized out>) at pthread_create.c:304
#5  0x00007f2bcc68670d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()

Thread 110 (Thread 0x7f2bc9e53700 (LWP 9380)):

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(gdb) thread 81
(gdb) frame 3
(gdb) print *zio
$1 = {io_bookmark = {zb_objset = 51, zb_object = 169, zb_level = 0, zb_blkid = 84861110386}, io_prop = {zp_checksum = ZIO_CHECKSUM_INHERIT, 
    zp_compress = ZIO_COMPRESS_INHERIT, zp_type = DMU_OT_NONE, zp_level = 0 '\000', zp_copies = 0 '\000', zp_dedup = 0 '\000', 
    zp_dedup_verify = 0 '\000'}, io_type = ZIO_TYPE_WRITE, io_child_type = ZIO_CHILD_VDEV, io_cmd = 0, io_priority = 10 '\n', 
  io_reexecute = 0 '\000', io_state = "\001", io_txg = 1320, io_spa = 0x259eac0, io_bp = 0x0, io_bp_override = 0x0, io_bp_copy = {blk_dva = {{
        dva_word = {0, 0}}, {dva_word = {0, 0}}, {dva_word = {0, 0}}}, blk_prop = 0, blk_pad = {0, 0}, blk_phys_birth = 0, blk_birth = 0, 
    blk_fill = 0, blk_cksum = {zc_word = {0, 0, 0, 0}}}, io_parent_list = {list_size = 48, list_offset = 16, list_head = {
      list_next = 0x7f2bcccf9820, list_prev = 0x7f2bcccf9820}}, io_child_list = {list_size = 48, list_offset = 32, list_head = {

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vdev_raidz_io_start(WRITE,   0,    2243584,   512): DVA[0]=<0:223c00:400> DVA[1]=<0:301f800:400> DVA[2]=<0:5e15000:400> [L0 DMU objset] fletcher4 lzjb LE contiguous unique triple size=800L/200P birth=11L/11P fill=44 cksum=1101c183f2:6028c5c42e1:119b8efc307a3:239cfd476e26cb
vdev_raidz_io_start(WRITE,   1,    2243584,   512): DVA[0]=<0:223c00:400> DVA[1]=<0:301f800:400> DVA[2]=<0:5e15000:400> [L0 DMU objset] fletcher4 lzjb LE contiguous unique triple size=800L/200P birth=11L/11P fill=44 cksum=1101c183f2:6028c5c42e1:119b8efc307a3:239cfd476e26cb
vdev_raidz_io_start(WRITE,   0,   50460672,   512): DVA[0]=<0:223c00:400> DVA[1]=<0:301f800:400> DVA[2]=<0:5e15000:400> [L0 DMU objset] fletcher4 lzjb LE contiguous unique triple size=800L/200P birth=11L/11P fill=44 cksum=1101c183f2:6028c5c42e1:119b8efc307a3:239cfd476e26cb
vdev_raidz_io_start(WRITE,   1,   50460672,   512): DVA[0]=<0:223c00:400> DVA[1]=<0:301f800:400> DVA[2]=<0:5e15000:400> [L0 DMU objset] fletcher4 lzjb LE contiguous unique triple size=800L/200P birth=11

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configure.ac:37: installing `config/config.guess'
configure.ac:37: installing `config/config.sub'
configure.ac:40: installing `config/install-sh'
configure.ac:40: installing `config/missing'
cmd/mount_zfs/Makefile.am: installing `config/depcomp'
checking metadata... yes
checking build system type... x86_64-unknown-linux-gnu
checking host system type... x86_64-unknown-linux-gnu
checking target system type... x86_64-unknown-linux-gnu
checking whether to enable maintainer-specific portions of Makefiles... no

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#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

static const size_t FILE_SIZE = 512;