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-2978 Lustre <p>We got the following error messages on the clients. Would you please advise us what happens?</p> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre>[7823336.242007] BUG: unable to handle kernel NULL pointer dereference at (null) [7823336.242021] IP: [&lt;ffffffffa0b54e8a&gt;] ll_readahead+0x4a/0x1e00 [lustre] [7823336.242051] PGD 1c7bbfd067 PUD 1d0d456067 PMD 0 [7823336.242056] Oops: 0000 [#1] SMP [7823336.242060] last sysfs file: /sys/module/qlgc_srp/parameters/log_level [7823336.242065] CPU 14 [7823336.242067] Modules linked in: mgc(N) lustre(N) lov(N) mdc(N) lquota(N) osc(N) ko2iblnd(N) ptlrpc(N) obdclass(N) lnet(N) lvfs(N) libcfs(N) qlgc_srp(N) rdma_ucm rdma_cm iw_cm ib_addr ib_ipoib ib_cm ipv6 ib_usa(N) ib_sa ib_uverbs ib_umad kcopy(N) mlx4_ib mlx4_core ib_mthca cpufreq_conservative cpufreq_userspace cpufreq_powersave powernow_k8 loop dm_mod ide_pci_generic atiixp ide_core rfkill ata_generic i2c_piix4 led_class tpm_tis pcspkr ib_qib(N) serio_raw pata_atiixp ahci tpm wmi tpm_bios libata ib_mad joydev i2c_core ib_core thermal button processor thermal_sys hwmon 8021q nfs ext2 crc_t10dif scsi_tgt exportfs auth_rpcgss fscache garp stp llc af_packet ipmi_poweroff ipmi_watchdog ipmi_devintf ipmi_si ipmi_msghandler autofs4 forcedeth pcnet32 nfs_acl lockd sunrpc e100 mii megaraid_sas mpt2sas raid_class scsi_transport_sas scsi_mod e1000e e1000 cxgb3 usbhid hid ixgbe bnx2x crc32c libcrc32c mdio bnx2 tg3 ext3 mbcache jbd uhci_hcd ohci_hcd ehci_hcd igb usbcore dca rtc_cmos rtc_core rtc_lib [7823336.242151] Supported: No, Unsupported modules are loaded [7823336.242157] Pid: 17724, comm: psiblast Tainted: G M W N 2.6.32.12-0.7-default #1 AR585 F1 [7823336.242161] RIP: 0010:[&lt;ffffffffa0b54e8a&gt;] [&lt;ffffffffa0b54e8a&gt;] ll_readahead+0x4a/0x1e00 [lustre] [7823336.242174] RSP: 0000:ffff88065a745a38 EFLAGS: 00010246 [7823336.242177] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff880ba1dfaa00 [7823336.242180] RDX: 0000000000000000 RSI: ffff881014ed8600 RDI: ffff881ee44695c0 [7823336.242184] RBP: ffff881ee44695c0 R08: 0000000000000000 R09: 0000000000000001 [7823336.242187] R10: 0000000000000000 R11: ffff880ba1dfaa00 R12: ffffea005602d898 [7823336.242191] R13: ffff881ee44695c0 R14: ffff880960b267b0 R15: ffff8810157c4000 [7823336.242195] FS: 00002ae46f14d710(0000) GS:ffff880836480000(0000) knlGS:0000000055eaa150 [7823336.242199] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [7823336.242202] CR2: 0000000000000000 CR3: 0000001e96bac000 CR4: 00000000000006e0 [7823336.242206] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [7823336.242209] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [7823336.242213] Process psiblast (pid: 17724, threadinfo ffff88065a744000, task ffff8800471be5c0) [7823336.242217] Stack: [7823336.242219] ffff880c00000000 0000000000000000 ffff880c09207ce8 ffff880c09207c80 [7823336.242223] &lt;0&gt; 5a5a5a5a5a5a5a5a ffff880ba1dfaa00 0000000000000001 ffff880960b267f8 [7823336.242228] &lt;0&gt; ffff881014513000 ffff880cf6a37240 ffff880e26985e80 ffff880960b26830 [7823336.242234] Call Trace: [7823336.242280] [&lt;ffffffffa0b57e83&gt;] ll_readpage+0x1243/0x18a0 [lustre] [7823336.242297] [&lt;ffffffff810b4fd1&gt;] filemap_fault+0x241/0x3d0 [7823336.242313] [&lt;ffffffffa0b65bd7&gt;] ll_fault+0x3b7/0xdd0 [lustre] [7823336.242335] [&lt;ffffffff810cd9f7&gt;] __do_fault+0x57/0x520 [7823336.242343] [&lt;ffffffff810d2349&gt;] handle_mm_fault+0x199/0x430 [7823336.242351] [&lt;ffffffff813999cf&gt;] do_page_fault+0x1bf/0x3e0 [7823336.242358] [&lt;ffffffff813972ef&gt;] page_fault+0x1f/0x30 [7823336.242366] [&lt;0000000000b916e1&gt;] 0xb916e1 [7823336.242369] Code: a0 00 00 00 48 89 94 24 98 00 00 00 48 89 8c 24 90 00 00 00 74 0d 80 3d 44 0a c7 ff 00 0f 88 9e 04 00 00 48 8b 84 24 98 00 00 00 &lt;48&gt; 8b 00 48 89 84 24 b0 00 00 00 4c 8b a0 f0 fe ff ff 4c 89 e7 [7823336.242395] RIP [&lt;ffffffffa0b54e8a&gt;] ll_readahead+0x4a/0x1e00 [lustre] [7823336.242405] RSP &lt;ffff88065a745a38&gt; [7823336.242407] CR2: 0000000000000000 [7823336.242992] ---[ end trace 77202dc4e7188011 ]--- </pre> </div></div> CentOS5.8, Lustre-1.8.8-wc1 and SLES11SP1(client) LU-2978

unable to handle kernel NULL pointer dereference at ll_readahead

Bug Minor Resolved Duplicate Bob Glossman Shuichi Ihara Sun, 17 Mar 2013 05:39:10 +0000 Fri, 4 Mar 2016 18:43:46 +0000 Fri, 4 Mar 2016 18:43:46 +0000 0 4 <p>This is very similar to <a href="https://jira.whamcloud.com/browse/LU-1878" title="NULL pointer in ll_readahead()" class="issue-link" data-issue-key="LU-1878"><del>LU-1878</del></a>, is that same problem?</p> <p>Bob</p> <p>Could you please comment on this one?</p> <p>Thanks</p> <p>Peter</p> <p>This looks very much like a dup of <a href="https://jira.whamcloud.com/browse/LU-1878" title="NULL pointer in ll_readahead()" class="issue-link" data-issue-key="LU-1878"><del>LU-1878</del></a> to me. The fix <a href="http://review.whamcloud.com/#change,4026" class="external-link" target="_blank" rel="nofollow noopener">http://review.whamcloud.com/#change,4026</a> for that bug has been waiting for replies to review comments for a while.</p> <p>Closing as a duplicate. Many changes in this area of code make this ticket redundant now.</p> <p>~ jfc.</p> Development Rank 1|hzvlk7: Rank (Obsolete) 7260 Severity