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I did a v2 of this patch already.
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<div class="">Changing to the safe version of the list macros is a mixed bag. </div>
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<div class="">Doug</div>
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<blockquote type="cite" class="">
<div class="">On May 10, 2018, at 5:53 PM, NeilBrown <<a href="mailto:neilb@suse.com" class="">neilb@suse.com</a>> wrote:</div>
<br class="Apple-interchange-newline">
<div class=""><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">On
Wed, May 09 2018, Doug Oucharek wrote:</span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">
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<blockquote type="cite" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">
Under upstream staging commit 5a2ca43fa54f561c252c2, the list handling<br class="">
code in kiblnd_handle_early_rxs() got changed to list_for_each_safe().<br class="">
That protects against the current thread from deleting the current entry<br class="">
it is looking at. It does not protect against another thread from deleting<br class="">
the next item in the list (which the tmp variable points to). The way this<br class="">
routine holds then releases a lock opens the door to other threads doing<br class="">
just that.<br class="">
<br class="">
This patch reverts this commit on this routine.<br class="">
<br class="">
Intel-bug-id: <a href="https://jira.hpdd.intel.com/browse/LU-9886" class="">https://jira.hpdd.intel.com/browse/LU-9886</a><br class="">
Signed-off-by: Doug Oucharek <<a href="mailto:dougso@me.com" class="">dougso@me.com</a>><br class="">
---<br class="">
drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c | 5 +++--<br class="">
1 file changed, 3 insertions(+), 2 deletions(-)<br class="">
<br class="">
diff --git a/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c b/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c<br class="">
index 32fa8ca..6148fbb 100644<br class="">
--- a/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c<br class="">
+++ b/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c<br class="">
@@ -1965,13 +1965,14 @@ static int kiblnd_resolve_addr(struct rdma_cm_id *cmid,<br class="">
{<br class="">
<span class="Apple-tab-span" style="white-space: pre;"></span>unsigned long flags;<br class="">
<span class="Apple-tab-span" style="white-space: pre;"></span>struct kib_rx *rx;<br class="">
-<span class="Apple-tab-span" style="white-space: pre;"> </span>struct kib_rx *tmp;<br class="">
<br class="">
<span class="Apple-tab-span" style="white-space: pre;"></span>LASSERT(!in_interrupt());<br class="">
<span class="Apple-tab-span" style="white-space: pre;"></span>LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);<br class="">
<br class="">
<span class="Apple-tab-span" style="white-space: pre;"></span>write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);<br class="">
-<span class="Apple-tab-span" style="white-space: pre;"> </span>list_for_each_entry_safe(rx, tmp, &conn->ibc_early_rxs, rx_list) {<br class="">
+<span class="Apple-tab-span" style="white-space: pre;"> </span>while (!list_empty(&conn->ibc_early_rxs)) {<br class="">
+<span class="Apple-tab-span" style="white-space: pre;"> </span><span class="Apple-tab-span" style="white-space: pre;"></span>rx = list_entry(conn->ibc_early_rxs.next,<br class="">
+<span class="Apple-tab-span" style="white-space: pre;"> </span><span class="Apple-tab-span" style="white-space: pre;"></span><span class="Apple-tab-span" style="white-space: pre;"></span><span class="Apple-tab-span" style="white-space: pre;"></span>kib_rx_t,
rx_list);<br class="">
</blockquote>
<span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">Should
be:</span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">
<span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class=""> struct
kib_tx</span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">
<br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">
<span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">Otherwise,</span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">
<span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">Reviewed-by:
NeilBrown <</span><a href="mailto:neilb@suse.com" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">neilb@suse.com</a><span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">></span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">
<br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">
<span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">Those
"convert lots of list_for_each" things really do need</span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">
<span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">careful
review, don't they :-(</span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">
<br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">
<span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">Thanks,</span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">
<span style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: inline !important;" class="">NeilBrown</span><br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">
<br style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">
<blockquote type="cite" style="font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">
<span class="Apple-tab-span" style="white-space: pre;"></span><span class="Apple-tab-span" style="white-space: pre;"></span>list_del(&rx->rx_list);<br class="">
<span class="Apple-tab-span" style="white-space: pre;"></span><span class="Apple-tab-span" style="white-space: pre;"></span>write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);<br class="">
<br class="">
--<span class="Apple-converted-space"> </span><br class="">
1.8.3.1<br class="">
<br class="">
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</blockquote>
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