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Increase default user space stack size

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Under RHEL6/CentOS6 the default stack size must be increased to 32K
to prevent overflowing the stack when running ztest.  This isn't an
issue for other distributions due to either the version of pthreads
or perhaps the compiler.  Doubling the stack size resolves the
issue safely for all distribution and leaves us some headroom.

$ sudo -E ztest -V -T 300 -f /var/tmp/
5 vdevs, 7 datasets, 23 threads, 300 seconds...

loading space map for vdev 0 of 1, metaslab 0 of 30 ...
...
loading space map for vdev 0 of 1, metaslab 14 of 30 ...
child died with signal 11
Exited ztest with error 3

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #4215
This commit is contained in:
Brian Behlendorf
2016-01-13 10:41:24 -08:00
parent e6cfd633be
commit 89666a8e1c
3 changed files with 5 additions and 6 deletions
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module/zfs/txg.c
+1 -1
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@@ -212,7 +212,7 @@ txg_sync_start(dsl_pool_t *dp)
* 32-bit x86. This is due in part to nested pools and
* scrub_visitbp() recursion.
*/
tx->tx_sync_thread = thread_create(NULL, 32<<10, txg_sync_thread,
tx->tx_sync_thread = thread_create(NULL, 0, txg_sync_thread,
dp, 0, &p0, TS_RUN, defclsyspri);
mutex_exit(&tx->tx_sync_lock);