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-2941 Lustre <p>To reproduce run </p> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre>while true; do cat /proc/fs/lustre/llite/*/site &amp;&gt; /dev/null; done &amp; llmount.sh </pre> </div></div> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre>crash&gt; bt PID: 2221 TASK: ffff88018da2a040 CPU: 1 COMMAND: "cat" #0 [ffff8801671c18d0] machine_kexec at ffffffff81031f7b #1 [ffff8801671c1930] crash_kexec at ffffffff810b8c22 #2 [ffff8801671c1a00] oops_end at ffffffff814eef80 #3 [ffff8801671c1a30] no_context at ffffffff81042a0b #4 [ffff8801671c1a80] __bad_area_nosemaphore at ffffffff81042c95 #5 [ffff8801671c1ad0] bad_area at ffffffff81042dbe #6 [ffff8801671c1b00] __do_page_fault at ffffffff81043570 #7 [ffff8801671c1c20] do_page_fault at ffffffff814f0f5e #8 [ffff8801671c1c50] page_fault at ffffffff814ee315 [exception RIP: lu_site_stats_print+66] RIP: ffffffffa10a4752 RSP: ffff8801671c1d08 RFLAGS: 00010282 RAX: ffff880118714000 RBX: 0000000000000000 RCX: 0000000000001000 RDX: 0000000000001000 RSI: ffff8801671c1d98 RDI: 0000000000000000 RBP: ffff8801671c1dd8 R8: ffff8801671c1e64 R9: ffff8801664b6c00 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000001000 R13: 0000000000000000 R14: ffff880166ee4000 R15: 0000000000000000 ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018 #9 [ffff8801671c1de0] cl_site_stats_print at ffffffffa10ac617 [obdclass] #10 [ffff8801671c1e30] ll_rd_site_stats at ffffffffa0c5ad25 [lustre] #11 [ffff8801671c1e40] lprocfs_fops_read at ffffffffa10649e3 [obdclass] #12 [ffff8801671c1ea0] proc_reg_read at ffffffff811dcbde #13 [ffff8801671c1ef0] vfs_read at ffffffff811782b5 #14 [ffff8801671c1f30] sys_read at ffffffff811783f1 #15 [ffff8801671c1f80] system_call_fastpath at ffffffff8100b072 RIP: 0000003282eda360 RSP: 00007fff17cae0f0 RFLAGS: 00010206 RAX: 0000000000000000 RBX: ffffffff8100b072 RCX: 0000000000a2f030 RDX: 0000000000008000 RSI: 0000000000a27000 RDI: 0000000000000003 RBP: 0000000000a27000 R8: 000000328318dee8 R9: 0000000000000001 R10: 0000000000008fff R11: 0000000000000246 R12: ffffffffffff8000 R13: 0000000000000003 R14: 0000000000008000 R15: 0000000000000003 ORIG_RAX: 0000000000000000 CS: 0033 SS: 002b crash&gt; dis -l lu_site_stats_print+66 /root/lustre-release/lustre/obdclass/lu_object.c: 2121 0xffffffffa10a4752 &lt;lu_site_stats_print+66&gt;: mov (%rdi),%rdi </pre> </div></div> LU-2941

Oops in lu_site_stats_print()

Bug Minor Resolved Fixed Emoly Liu John Hammond patch Sat, 9 Mar 2013 22:54:03 +0000 Tue, 15 Oct 2013 23:51:38 +0000 Tue, 15 Oct 2013 23:51:38 +0000 Lustre 2.4.0 Lustre 2.5.0 0 6 <p>The oops is triggered as the proc entry is hit before the related data structures used to print the stats are allocated and initialised. In client_common_fill_super() proc entry is created before cl_sb_init() and therefore lu_site is not allocated and it crashes when you try to read lu_site stats. We moved the creation of proc entry after the cl_sb_init() and it fixed the problem. We will send the patch for review today.</p> <p>Gerrit patch link <br/> <a href="http://review.whamcloud.com/#/c/6852" class="external-link" target="_blank" rel="nofollow noopener">http://review.whamcloud.com/#/c/6852</a> </p> <p>This issue could be closed, patch was merged.</p> <p>patch landed for 2.5</p> <p>Added 2.5.0 FixVersion</p> Development Rank 1|hzvkjz: Rank (Obsolete) 7059 Severity