https://jira.whamcloud.com This file is an XML representation of an issue en-us 9.4.14 940014 05-12-2023 https://jira.whamcloud.com/browse/LU-15933 Lustre <p>lustre clients hang with following call trace.</p> <p>      BUG: kernel NULL pointer dereference, address: 0000000000000008<br/>       RIP: 0010:iov_iter_advance+0x1ef/0x260<br/>       Call Trace:<br/>        vvp_io_rw_lock+0x240/0x7e0 <span class="error">&#91;lustre&#93;</span><br/>        vvp_io_read_lock+0x3f/0xd0 <span class="error">&#91;lustre&#93;</span><br/>        cl_io_lock+0x62/0x2d0 <span class="error">&#91;obdclass&#93;</span><br/>        cl_io_loop+0x8b/0x1f0 <span class="error">&#91;obdclass&#93;</span><br/>        ll_file_io_generic+0x436/0xd60 <span class="error">&#91;lustre&#93;</span><br/>        ll_file_read_iter+0x42c/0x5d0 <span class="error">&#91;lustre&#93;</span><br/>        generic_file_splice_read+0xf7/0x1a0<br/>        do_splice_to+0x81/0xb0<br/>        splice_direct_to_actor+0xbc/0x230<br/>        ? opipe_prep.part.0+0xb0/0xb0<br/>        do_splice_direct+0x89/0xd0<br/>        do_sendfile+0x303/0x450</p> client kernel version &gt;= 5.13 LU-15933

client hang with NULL pointer dereference, at iov_iter_advance

Bug Major Resolved Fixed Zhenyu Xu Zhenyu Xu Sat, 11 Jun 2022 17:14:37 +0000 Tue, 4 Oct 2022 19:38:39 +0000 Wed, 6 Jul 2022 13:09:23 +0000 Lustre 2.16.0 Lustre 2.15.1 0 4 <p>the iov_iter type compile testing is</p> <div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent"> <pre class="code-java"> 208 LB_CHECK_COMPILE([<span class="code-keyword">if</span> iov_iter has member type], 209 iov_iter_has_type_member, [ 210 #include &lt;linux/uio.h&gt; 211 ],[ 212 struct iov_iter iter = { .type = ITER_KVEC }; 213 (void)iter; 214 ],[ 215 AC_DEFINE(HAVE_IOV_ITER_HAS_TYPE_MEMBER, 1, 216 [<span class="code-keyword">if</span> iov_iter has member type]) 217 ]) </pre> </div></div> <p>while kernel commit 8cd54c1c84803 (v5.13) has changed the member -&gt;type to -&gt;iter_type, and I think that's caused the mess.</p> <div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent"> <pre class="code-java"> struct iov_iter { - /* - * Bit 0 is the read/write bit, set <span class="code-keyword">if</span> we're writing. - * Bit 1 is the BVEC_FLAG_NO_REF bit, set <span class="code-keyword">if</span> type is a bvec and - * the caller isn't expecting to drop a page reference when done. - */ - unsigned <span class="code-object">int</span> type; + u8 iter_type; + bool data_source; size_t iov_offset; size_t count; union {</pre> </div></div> <p>"Bobi Jam &lt;bobijam@hotmail.com&gt;" uploaded a new patch: <a href="https://review.whamcloud.com/47601" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/47601</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-15933" title="client hang with NULL pointer dereference, at iov_iter_advance" class="issue-link" data-issue-key="LU-15933"><del>LU-15933</del></a> libcfs: fix configure check for iov_iter member<br/> Project: fs/lustre-release<br/> Branch: master<br/> Current Patch Set: 1<br/> Commit: c0cf40a3d0846ca5c0a72dd2022e5b9c7f46c52a</p> <p>"Jian Yu &lt;yujian@whamcloud.com&gt;" uploaded a new patch: <a href="https://review.whamcloud.com/47756" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/47756</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-15933" title="client hang with NULL pointer dereference, at iov_iter_advance" class="issue-link" data-issue-key="LU-15933"><del>LU-15933</del></a> libcfs: fix configure check for iov_iter member<br/> Project: fs/lustre-release<br/> Branch: b2_15<br/> Current Patch Set: 1<br/> Commit: d48d845e3c906a2090c6409926360362bd922c55</p> <p>"Oleg Drokin &lt;green@whamcloud.com&gt;" merged in patch <a href="https://review.whamcloud.com/47601/" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/47601/</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-15933" title="client hang with NULL pointer dereference, at iov_iter_advance" class="issue-link" data-issue-key="LU-15933"><del>LU-15933</del></a> libcfs: fix configure check for iov_iter member<br/> Project: fs/lustre-release<br/> Branch: master<br/> Current Patch Set: <br/> Commit: ae53ef4a6ab0491c01b723322f45c931e22f6140</p> <p>"Oleg Drokin &lt;green@whamcloud.com&gt;" merged in patch <a href="https://review.whamcloud.com/47756/" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/47756/</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-15933" title="client hang with NULL pointer dereference, at iov_iter_advance" class="issue-link" data-issue-key="LU-15933"><del>LU-15933</del></a> libcfs: fix configure check for iov_iter member<br/> Project: fs/lustre-release<br/> Branch: b2_15<br/> Current Patch Set: <br/> Commit: 8a2a5f3ffea68b0866e983302ccab152b12207c9</p> Related Development Rank 1|i02rx3: Rank (Obsolete) 9223372036854775807 Severity