Whamcloud Community JIRA https://jira.whamcloud.com This file is an XML representation of an issue en-us 9.4.14 940014 05-12-2023 [LU-16576] [ 281.513748] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 https://jira.whamcloud.com/browse/LU-16576 Lustre <p>Hit on master commit eed4d4c752 <a href="https://jira.whamcloud.com/browse/LU-16536" title="MDS umount can get stuck due to LDLM locks" class="issue-link" data-issue-key="LU-16536"><del>LU-16536</del></a> osp: don't cleanup ldlm in precleanup phase</p> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre>[root@el8-mds2 ~]# start.sh insmod /home/hornc/lustre-wc-rel/libcfs/libcfs/libcfs.ko insmod /home/hornc/lustre-wc-rel/lnet/lnet/lnet.ko insmod /home/hornc/lustre-wc-rel/lnet/klnds/socklnd/ksocklnd.ko debug=+net malloc [root@el8-mds2 ~]# lnetctl net add --net tcp --if eth2 [root@el8-mds2 ~]# lnetctl net add --net tcp2 --if eth3 [root@el8-mds2 ~]# lnetctl net del --net tcp --if eth3 &lt;oops&gt; </pre> </div></div> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre>[ 281.513748] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 [ 281.514297] PGD 8000000002d96067 P4D 8000000002d96067 PUD 55b1067 PMD 0 [ 281.514715] Oops: 0000 [#1] SMP PTI [ 281.514979] CPU: 1 PID: 2948 Comm: lt-lnetctl Kdump: loaded Tainted: G OE --------- - - 4.18.0-425.3.1.el8.x86_64 #1 [ 281.515672] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS VirtualBox 12/01/2006 [ 281.516076] RIP: 0010:lnet_net_cmd+0x515/0xa00 [lnet] [ 281.516401] Code: 98 c0 48 c7 c6 60 f2 97 c0 48 c7 c7 c0 bc 99 c0 c7 05 c3 f8 05 00 01 00 00 00 49 89 c9 49 89 c8 e8 f0 32 ca ff e9 32 fb ff ff &lt;4c&gt; 8b 3c 25 00 00 00 00 49 39 df 0f 85 1e ff ff ff 49 8b 5d 40 48 [ 281.517412] RSP: 0018:ffffa56c8128b640 EFLAGS: 00010286 [ 281.517735] RAX: 00000000ffffffff RBX: ffff929b04167410 RCX: 0000000000000032 [ 281.518117] RDX: 0000000000000004 RSI: ffffa56c8128b6a8 RDI: ffff929b03392e18 [ 281.518493] RBP: 0000000000000030 R08: 0000000000000033 R09: ffffa56c8128b6ac [ 281.518869] R10: ffffa56c8128b664 R11: ffffffffffffffff R12: ffff929b03b68e40 [ 281.519245] R13: ffffa56c8128ba50 R14: ffffa56c8128b698 R15: ffff929b06662800 [ 281.519622] FS: 00007f7f00e3d380(0000) GS:ffff929b7db00000(0000) knlGS:0000000000000000 [ 281.520043] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 281.520363] CR2: 0000000000000000 CR3: 0000000006066001 CR4: 00000000000706e0 [ 281.520733] Call Trace: [ 281.520949] genl_family_rcv_msg_doit.isra.17+0x113/0x150 [ 281.521277] genl_family_rcv_msg+0xb7/0x170 [ 281.521547] ? lnet_dyn_del_net+0x1f0/0x1f0 [lnet] [ 281.521862] ? lnet_res_container_setup+0x2c0/0x2c0 [lnet] [ 281.522198] ? lnet_counters_get+0x140/0x140 [lnet] [ 281.522501] ? lnet_startup_lndnet+0x7b0/0x7b0 [lnet] [ 281.522805] genl_rcv_msg+0x47/0xa0 [ 281.523043] ? genl_family_rcv_msg+0x170/0x170 [ 281.523329] netlink_rcv_skb+0x4c/0x130 [ 281.523597] genl_rcv+0x24/0x40 [ 281.523835] netlink_unicast+0x19a/0x230 [ 281.524102] netlink_sendmsg+0x204/0x3d0 [ 281.524790] sock_sendmsg+0x50/0x60 [ 281.525080] ____sys_sendmsg+0x1ef/0x250 [ 281.525344] ? copy_msghdr_from_user+0x5c/0x90 [ 281.525612] ___sys_sendmsg+0x7c/0xc0 [ 281.525832] ? __raw_spin_unlock+0x5/0x10 [ 281.526047] ? handle_pte_fault+0x770/0x880 [ 281.526375] ? __handle_mm_fault+0x453/0x6c0 [ 281.526632] __sys_sendmsg+0x57/0xa0 [ 281.526871] do_syscall_64+0x5b/0x1b0 [ 281.527115] entry_SYSCALL_64_after_hwframe+0x61/0xc6 [ 281.527395] RIP: 0033:0x7f7effb81928 </pre> </div></div> LU-16576 [ 281.513748] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 Bug Minor Open Unresolved WC Triage Chris Horn Fri, 17 Feb 2023 21:29:35 +0000 Fri, 17 Feb 2023 21:29:35 +0000 0 1 Development Rank 1|i03eh3: Rank (Obsolete) 9223372036854775807 Severity