Server was panicked with "BUG: unable to handle kernel NULL pointer dereference at (null)" because of involvement of third party module rdma_cm
Issue
"BUG: unable to handle kernel NULL pointer dereference at (null)"
[11784649.062488] Modules linked in: tcp_diag udp_diag inet_diag unix_diag af_packet_diag netlink_diag iptable_filter mmfs26(OE) mmfslinux(OE) tracedev(OE) ext4 mbcache jbd2 nvmeibs(POE) nfsv3 nfs_acl nvmeibc(POE) rpcsec_gss_krb5 nfsv4 dns_resolver nfs lockd grace fscache nvmeib_common_mlx5_public(OE) nvmeib_common_mlx4_public(OE) nvmeib_common_public(OE) nvmeib_common(POE) bonding mlx5_fpga_tools(OE) mlx4_ib(OE) mlx4_en(OE) mlx4_core(OE) ib_isert(OE) iscsi_target_mod target_core_mod ib_srpt(OE) ib_srp(OE) scsi_transport_srp(OE) ib_ucm(OE) rdma_ucm(OE) ib_iser(OE) ib_umad(OE) rdma_cm(OE) iw_cm(OE) libiscsi scsi_transport_iscsi ib_ipoib(OE) ib_cm(OE) intel_powerclamp coretemp intel_rapl iosf_mbi mlx5_ib(OE) ib_uverbs(OE) ib_core(OE) kvm ipmi_ssif irqbypass crc32_pclmul ghash_clmulni_intel aesni_intel lrw
[11784649.069923] gf128mul glue_helper ablk_helper cryptd pcspkr ses enclosure mei_me sg lpc_ich mei ipmi_si hpilo hpwdt wmi ipmi_devintf ipmi_msghandler acpi_power_meter binfmt_misc knem(OE) auth_rpcgss sunrpc ip_tables xfs libcrc32c dm_snapshot dm_bufio uas usb_storage sd_mod crc_t10dif crct10dif_generic mgag200 i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm mlx5_core(OE) crct10dif_pclmul crct10dif_common crc32c_intel mlxfw(OE) drm serio_raw vfio_mdev(OE) vfio_iommu_type1 nvme smartpqi vfio tg3 nvme_core mdev(OE) scsi_transport_sas mlx_compat(OE) devlink ptp pps_core drm_panel_orientation_quirks dm_mirror dm_region_hash dm_log dm_mod
[11784649.077289] CPU: 35 PID: 21580 Comm: kworker/u72:0 Kdump: loaded Tainted: P W OE ------------ 3.10.0-1062.9.1.el7.x86_64 #1
[11784649.079692] Hardware name: HPE ProLiant DL380 Gen10/ProLiant DL380 Gen10, BIOS U30 03/09/2020
[11784649.080906] Workqueue: rdma_cm cma_work_handler [rdma_cm]
[11784649.082099] task: ffff9f9de26c41c0 ti: ffff9f8f37be8000 task.ti: ffff9f8f37be8000
[11784649.083286] RIP: 0010:[<ffffffffbbcd375d>] [<ffffffffbbcd375d>] __wake_up_common+0x4d/0x120
[11784649.084469] RSP: 0018:ffff9f8f37bebd70 EFLAGS: 00010086
[11784649.085634] RAX: ffffffffffffffe8 RBX: ffff9f41834fae58 RCX: 0000000000000000
[11784649.086790] RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffff9f41834fae58
[11784649.087931] RBP: ffff9f8f37bebdb8 R08: 0000000000000000 R09: 0000000000000000
[11784649.089060] R10: 0000000000000000 R11: 000000000000254c R12: ffff9f41834fae50
[11784649.090175] R13: ffff9f41834fae60 R14: 0000000000000000 R15: 0000000000000900
[11784649.091272] FS: 0000000000000000(0000) GS:ffff9ff8bfa40000(0000) knlGS:0000000000000000
[11784649.092362] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[11784649.093434] CR2: 0000000000000000 CR3: 000000a4f029e000 CR4: 00000000007607e0
[11784649.094498] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[11784649.095540] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[11784649.096563] PKRU: 00000000
[11784649.097564] Call Trace:
[11784649.098548] [<ffffffffbbcd39cf>] complete+0x3f/0x60
[11784649.099529] [<ffffffffc08da118>] cma_deref_id+0x28/0x30 [rdma_cm]
[11784649.100490] [<ffffffffc08deb67>] cma_work_handler+0x47/0xa0 [rdma_cm]
[11784649.101435] [<ffffffffbbcbe21f>] process_one_work+0x17f/0x440
[11784649.102362] [<ffffffffbbcbf336>] worker_thread+0x126/0x3c0
[11784649.103271] [<ffffffffbbcbf210>] ? manage_workers.isra.26+0x2a0/0x2a0
[11784649.104167] [<ffffffffbbcc61f1>] kthread+0xd1/0xe0
[11784649.105042] [<ffffffffbbcc6120>] ? insert_kthread_work+0x40/0x40
[11784649.105902] [<ffffffffbc38dd1d>] ret_from_fork_nospec_begin+0x7/0x21
[11784649.106749] [<ffffffffbbcc6120>] ? insert_kthread_work+0x40/0x40
[11784649.107580] Code: 89 55 c4 89 4d d0 4c 89 45 c8 74 0a 41 f6 01 04 0f 85 a8 00 00 00 49 8b 45 08 48 83 e8 18 48 8d 50 18 49 83 c5 08 49 39 d5 74 5b <48> 8b 48 18 31 db 4c 8d 79 e8 66 0f 1f 84 00 00 00 00 00 4c 8b
[11784649.109312] RIP [<ffffffffbbcd375d>] __wake_up_common+0x4d/0x120
[11784649.110137] RSP <ffff9f8f37bebd70>
[11784649.110935] CR2: 0000000000000000
(END)
Environment
- Red Hat Enterprise Linux 7
- Third-party kernel module [rdma_cm]
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