[Cluster-devel] FS/DLM module triggered kernel BUG

[Gang He]

Hello Guys,

I used kernel 5.13.8, I sometimes encountered the dlm module triggered kernel BUG.
Since the dlm kernel module is not the latest source code, I am not sure if this problem is fixed, or not. 

The backtrace is as below,

[Fri Aug 20 16:24:14 2021] dlm: CEC5E19D749E473B99A0B792AD570441: remove member 172204615
[Fri Aug 20 16:24:14 2021] dlm: CEC5E19D749E473B99A0B792AD570441: dlm_recover_members 2 nodes
[Fri Aug 20 16:24:14 2021] dlm: connection 000000005ef82293 got EOF from 172204615
[Fri Aug 20 16:24:14 2021] dlm: CEC5E19D749E473B99A0B792AD570441: generation 4 slots 2 1:172204786 2:172204748
[Fri Aug 20 16:24:14 2021] dlm: CEC5E19D749E473B99A0B792AD570441: dlm_recover_directory
[Fri Aug 20 16:24:14 2021] dlm: CEC5E19D749E473B99A0B792AD570441: dlm_recover_directory 8 in 1 new
[Fri Aug 20 16:24:14 2021] dlm: CEC5E19D749E473B99A0B792AD570441: dlm_recover_directory 1 out 1 messages
[Fri Aug 20 16:24:14 2021] dlm: CEC5E19D749E473B99A0B792AD570441: dlm_recover_masters
[Fri Aug 20 16:24:14 2021] dlm: CEC5E19D749E473B99A0B792AD570441: dlm_recover_masters 33587 of 33599
[Fri Aug 20 16:24:14 2021] dlm: CEC5E19D749E473B99A0B792AD570441: dlm_recover_locks 0 out
[Fri Aug 20 16:24:14 2021] BUG: unable to handle page fault for address: ffffdd99ffd16650
[Fri Aug 20 16:24:14 2021] #PF: supervisor write access in kernel mode
[Fri Aug 20 16:24:14 2021] #PF: error_code(0x0002) - not-present page
[Fri Aug 20 16:24:14 2021] PGD 1040067 P4D 1040067 PUD 19c3067 PMD 19c4067 PTE 0
[Fri Aug 20 16:24:14 2021] Oops: 0002 [#1] SMP PTI
[Fri Aug 20 16:24:14 2021] CPU: 1 PID: 25221 Comm: kworker/u4:1 Tainted: G        W         5.13.8-1-default #1 openSUSE Tumbleweed
[Fri Aug 20 16:24:14 2021] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.9.1-0-gb3ef39f-prebuilt.qemu-project.org 04/01/2014
[Fri Aug 20 16:24:14 2021] Workqueue: dlm_recv process_recv_sockets [dlm]
[Fri Aug 20 16:24:14 2021] RIP: 0010:__srcu_read_unlock+0x15/0x20
[Fri Aug 20 16:24:14 2021] Code: 01 65 48 ff 04 c2 f0 83 44 24 fc 00 44 89 c0 c3 0f 1f 44 00 00 0f 1f 44 00 00 f0 83 44 24 fc 00 48 8b 87 e8 0c 00 00 48 63 f6 <65> 48 ff 44 f0 10 c3 0f 1f 40 00 0f 1f 44 00 00 41 54 49 89 fc 55
[Fri Aug 20 16:24:14 2021] RSP: 0018:ffffbd9a041ebd80 EFLAGS: 00010282
[Fri Aug 20 16:24:14 2021] RAX: 00003cc9c100ec00 RBX: 00000000000000dc RCX: 0000000000000830
[Fri Aug 20 16:24:14 2021] RDX: 0000000000000000 RSI: 0000000000000f48 RDI: ffffffffc06b4420
[Fri Aug 20 16:24:14 2021] RBP: ffffa0d028423974 R08: 0000000000000001 R09: 0000000000000004
[Fri Aug 20 16:24:14 2021] R10: 0000000000000000 R11: 0000000000000000 R12: ffffa0d028425000
[Fri Aug 20 16:24:14 2021] R13: 000000000a43a2f2 R14: ffffa0d028425770 R15: 000000000a43a2f2
[Fri Aug 20 16:24:14 2021] FS:  0000000000000000(0000) GS:ffffa0d03ed00000(0000) knlGS:0000000000000000
[Fri Aug 20 16:24:14 2021] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[Fri Aug 20 16:24:14 2021] CR2: ffffdd99ffd16650 CR3: 0000000002696000 CR4: 00000000000406e0
[Fri Aug 20 16:24:14 2021] Call Trace:
[Fri Aug 20 16:24:14 2021]  dlm_receive_buffer+0x66/0x150 [dlm]
[Fri Aug 20 16:24:14 2021]  dlm_process_incoming_buffer+0x38/0x90 [dlm]
[Fri Aug 20 16:24:14 2021]  receive_from_sock+0xd4/0x1f0 [dlm]
[Fri Aug 20 16:24:14 2021]  process_recv_sockets+0x1a/0x20 [dlm]
[Fri Aug 20 16:24:14 2021]  process_one_work+0x1df/0x370
[Fri Aug 20 16:24:14 2021]  worker_thread+0x50/0x400
[Fri Aug 20 16:24:14 2021]  ? process_one_work+0x370/0x370
[Fri Aug 20 16:24:14 2021]  kthread+0x127/0x150
[Fri Aug 20 16:24:14 2021]  ? set_kthread_struct+0x40/0x40
[Fri Aug 20 16:24:14 2021]  ret_from_fork+0x22/0x30
[Fri Aug 20 16:24:14 2021] Modules linked in: rdma_ucm ib_uverbs rdma_cm iw_cm ib_cm ib_core ocfs2_stack_user ocfs2 ocfs2_nodemanager ocfs2_stackglue quota_tree dlm af_packet iscsi_ibft iscsi_boot_sysfs rfkill intel_rapl_msr hid_generic intel_rapl_common usbhid virtio_net pcspkr joydev net_failover virtio_balloon i2c_piix4 failover tiny_power_button button fuse configfs crct10dif_pclmul crc32_pclmul ghash_clmulni_intel ata_generic uhci_hcd ehci_pci ehci_hcd cirrus drm_kms_helper aesni_intel usbcore crypto_simd syscopyarea sysfillrect sysimgblt fb_sys_fops cec cryptd rc_core drm serio_raw i6300esb virtio_blk ata_piix floppy qemu_fw_cfg btrfs blake2b_generic libcrc32c crc32c_intel xor raid6_pq sg dm_multipath dm_mod scsi_dh_rdac scsi_dh_emc scsi_dh_alua virtio_rng
[Fri Aug 20 16:24:14 2021] CR2: ffffdd99ffd16650
[Fri Aug 20 16:24:14 2021] ---[ end trace 2ddfa38b9d824d93 ]---
[Fri Aug 20 16:24:14 2021] RIP: 0010:__srcu_read_unlock+0x15/0x20
[Fri Aug 20 16:24:14 2021] Code: 01 65 48 ff 04 c2 f0 83 44 24 fc 00 44 89 c0 c3 0f 1f 44 00 00 0f 1f 44 00 00 f0 83 44 24 fc 00 48 8b 87 e8 0c 00 00 48 63 f6 <65> 48 ff 44 f0 10 c3 0f 1f 40 00 0f 1f 44 00 00 41 54 49 89 fc 55
[Fri Aug 20 16:24:14 2021] RSP: 0018:ffffbd9a041ebd80 EFLAGS: 00010282
[Fri Aug 20 16:24:14 2021] RAX: 00003cc9c100ec00 RBX: 00000000000000dc RCX: 0000000000000830
[Fri Aug 20 16:24:14 2021] RDX: 0000000000000000 RSI: 0000000000000f48 RDI: ffffffffc06b4420
[Fri Aug 20 16:24:14 2021] RBP: ffffa0d028423974 R08: 0000000000000001 R09: 0000000000000004
[Fri Aug 20 16:24:14 2021] R10: 0000000000000000 R11: 0000000000000000 R12: ffffa0d028425000
[Fri Aug 20 16:24:14 2021] R13: 000000000a43a2f2 R14: ffffa0d028425770 R15: 000000000a43a2f2
[Fri Aug 20 16:24:14 2021] FS:  0000000000000000(0000) GS:ffffa0d03ed00000(0000) knlGS:0000000000000000
[Fri Aug 20 16:24:14 2021] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[Fri Aug 20 16:24:14 2021] CR2: ffffdd99ffd16650 CR3: 0000000002696000 CR4: 00000000000406e0

Thanks
Gang