The kernel crashes in vfs_write() due to NULL pointer dereference

Issue

• The kernel crashes in vfs_write() due to NULL pointer dereference

[ 1432.532933] BUG: unable to handle kernel NULL pointer dereference at 0000000000000037
[ 1432.532964] IP: [<ffffffffac0417e9>] vfs_write+0x19/0x1f0
[ 1432.532986] PGD 8000000173482067 PUD 106330067 PMD 0 
[ 1432.533004] Oops: 0000 [#1] SMP 
[ 1432.533017] Modules linked in: symbdsnap(POE) macsec vsock_diag tcp_diag udp_diag inet_diag unix_diag af_packet_diag netlink_diag binfmt_misc xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 tun bridge stp llc ebtable_filter ebtables devlink ip6table_filter ip6_tables iptable_filter nfsv3 nfs fscache vmw_vsock_vmci_transport vsock dm_mirror dm_region_hash dm_log dm_mod ppdev iosf_mbi crc32_pclmul vmw_balloon ghash_clmulni_intel aesni_intel lrw gf128mul glue_helper ablk_helper cryptd joydev pcspkr sg parport_pc parport vmw_vmci i2c_piix4 nfsd auth_rpcgss nfs_acl lockd grace sunrpc ip_tables xfs libcrc32c sr_mod cdrom sd_mod crc_t10dif crct10dif_generic crct10dif_pclmul
[ 1432.533282]  crct10dif_common crc32c_intel serio_raw vmxnet3 ahci vmw_pvscsi libahci ata_generic pata_acpi vmwgfx drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm nfit ata_piix drm libnvdimm libata drm_panel_orientation_quirks
[ 1432.533360] CPU: 2 PID: 12532 Comm: pmx-spam-compil Kdump: loaded Tainted: P           OE  ------------ T 3.10.0-957.21.3.el7.x86_64 #1
[ 1432.533393] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 12/12/2018
[ 1432.533421] task: ffff8850728f1040 ti: ffff884fc7080000 task.ti: ffff884fc7080000
[ 1432.533441] RIP: 0010:[<ffffffffac0417e9>]  [<ffffffffac0417e9>] vfs_write+0x19/0x1f0
[ 1432.533466] RSP: 0018:ffff884fc7083820  EFLAGS: 00010282
[ 1432.533482] RAX: fffffffffffffff3 RBX: fffffffffffffff3 RCX: ffff884fc7083860
[ 1432.533501] RDX: 0000000000000001 RSI: ffffffffc0933391 RDI: fffffffffffffff3
[ 1432.533521] RBP: ffff884fc7083850 R08: 000000000001f1a0 R09: ffffffffac05327d
[ 1432.533540] R10: ffff88507fd1f1a0 R11: ffffe60301f54800 R12: fffffffffffffff3
[ 1432.533559] R13: 00007ffffffff000 R14: ffff884f6f2a1500 R15: 0000000000001000
[ 1432.533580] FS:  0000000000000000(0000) GS:ffff88507fd00000(0063) knlGS:00000000f7472700
[ 1432.533602] CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
[ 1432.533618] CR2: 0000000000000037 CR3: 0000000185eb8000 CR4: 00000000007607e0
[ 1432.533671] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1432.533691] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1432.533711] PKRU: 55555554
[ 1432.533720] Call Trace:
[ 1432.533744]  [<ffffffffc0927255>] osDropCache+0x75/0xc0 [symbdsnap]
[ 1432.533766]  [<ffffffffc09299a5>] osAllocPage+0x25/0x40 [symbdsnap]
[ 1432.533786]  [<ffffffffc0929b00>] osCreateAndPopulateBios+0x140/0x460 [symbdsnap]
[ 1432.533809]  [<ffffffffc09179ab>] ? cleanupBioList+0x56/0x56 [symbdsnap]
[ 1432.533830]  [<ffffffffc0917ac7>] symSnapIssueReadFunc+0xa0/0x24d [symbdsnap]
[ 1432.533852]  [<ffffffffc09184f5>] ? symCoreProcessCurrentBio+0x540/0x765 [symbdsnap]
[ 1432.533877]  [<ffffffffac1454e7>] ? generic_make_request+0x147/0x380
[ 1432.533896]  [<ffffffffac07e9c2>] ? bvec_alloc+0x92/0x120
[ 1432.533913]  [<ffffffffac145790>] ? submit_bio+0x70/0x150
[ 1432.533929]  [<ffffffffac07ec63>] ? bio_alloc_bioset+0x213/0x310
[ 1432.534038]  [<ffffffffc0506385>] ? xfs_add_to_ioend+0x145/0x1d0 [xfs]
[ 1432.534069]  [<ffffffffc05069a7>] ? xfs_do_writepage+0x1d7/0x510 [xfs]
[ 1432.534089]  [<ffffffffabfc25bc>] ? write_cache_pages+0x21c/0x470
[ 1432.534117]  [<ffffffffc05067d0>] ? xfs_aops_discard_page+0x150/0x150 [xfs]
[ 1432.534147]  [<ffffffffc05065cb>] ? xfs_vm_writepages+0x6b/0xa0 [xfs]
[ 1432.534951]  [<ffffffffabfc36d1>] ? do_writepages+0x21/0x50
[ 1432.535723]  [<ffffffffabfb7f75>] ? __filemap_fdatawrite_range+0x65/0x80
[ 1432.536508]  [<ffffffffabfb80c1>] ? filemap_write_and_wait_range+0x41/0x90
[ 1432.537323]  [<ffffffffc051d40a>] ? xfs_setattr_size+0xfa/0x300 [xfs]
[ 1432.538085]  [<ffffffffac060a99>] ? inode_change_ok+0xd9/0x180
[ 1432.538851]  [<ffffffffc051d650>] ? xfs_vn_setattr_size+0x40/0x80 [xfs]
[ 1432.539621]  [<ffffffffc051d73b>] ? xfs_vn_setattr+0xab/0xc0 [xfs]
[ 1432.540368]  [<ffffffffac0607f4>] ? notify_change+0x2c4/0x420
[ 1432.541182]  [<ffffffffac03f575>] ? do_truncate+0x75/0xc0
[ 1432.541901]  [<ffffffffac03f74c>] ? vfs_truncate+0x18c/0x1f0
[ 1432.542594]  [<ffffffffac03f83c>] ? do_sys_truncate+0x8c/0xb0
[ 1432.543263]  [<ffffffffac570925>] ? do_page_fault+0x35/0x90
[ 1432.543911]  [<ffffffffac03fa0e>] ? SyS_truncate+0xe/0x10
[ 1432.544530]  [<ffffffffabe86e98>] ? sys32_truncate64+0x18/0x20
[ 1432.545123]  [<ffffffffac579bb0>] ? sysenter_dispatch+0xd/0x2b
[ 1432.545687] Code: ff ff eb ba 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 89 fb 48 83 ec 08 <f6> 47 44 02 0f 84 ad 01 00 00 48 8b 47 28 48 85 c0 0f 84 6b 01 
[ 1432.546918] RIP  [<ffffffffac0417e9>] vfs_write+0x19/0x1f0
[ 1432.547481]  RSP <ffff884fc7083820>
[ 1432.548037] CR2: 0000000000000037