Issue

• Kernel panic occurred during NULL pointer dereference inside gsch_flt_aio_write() function.

[6428(bash)]: gsch_scan(525204,1,0) - interrupted & wait(1000)
[6428(bash)]: gsch_scan(525204,1,0) - interrupted & wait: done
BUG: unable to handle kernel NULL pointer dereference at 0000000000000018
IP: [<ffffffffa036a7b1>] gsch_flt_aio_write+0x31/0x120 [gsch]
PGD 1d6215067 PUD 1d6216067 PMD 0 
Oops: 0000 [#1] SMP 
last sysfs file: /sys/devices/system/cpu/online
CPU 0 
Modules linked in: autofs4 nfs lockd fscache auth_rpcgss nfs_acl sunrpc secvm2(P)(U) secfs2(P)(U) gsch(U) redirfs(U) nf_conntrack_ipv4 nf_defrag_ipv4 iptable_filter ip_tables vsock(U) dsa_filter(P)(U) ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 xt_state nf_conntrack ip6table_filter ip6_tables ipv6 uinput ppdev microcode vmware_balloon parport_pc parport sg vmci(U) i2c_piix4 i2c_core shpchp ext4 jbd2 mbcache sd_mod crc_t10dif sr_mod cdrom vmxnet3 vmw_pvscsi pata_acpi ata_generic ata_piix dm_mirror dm_region_hash dm_log dm_mod [last unloaded: speedstep_lib]

Pid: 6099, comm: oracle Tainted: P           ---------------    2.6.32-504.23.4.el6.x86_64 #1 VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform
RIP: 0010:[<ffffffffa036a7b1>]  [<ffffffffa036a7b1>] gsch_flt_aio_write+0x31/0x120 [gsch]
RSP: 0018:ffff8801d6209908  EFLAGS: 00010297
RAX: ffff8801dffd6060 RBX: 0000000000000000 RCX: 00000000000003b0
RDX: 0000000000000000 RSI: ffff8801d6209988 RDI: ffff8801d62099c8
RBP: ffff8801d6209928 R08: 0000000000000000 R09: 000000000fd00003
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d6209988
R13: ffff8801d6209988 R14: ffff88023ac28a40 R15: ffff880224b6ebe0
FS:  00007ffff67d8700(0000) GS:ffff88002f600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000018 CR3: 00000001d61d6000 CR4: 00000000000407f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process oracle (pid: 6099, threadinfo ffff8801d6208000, task ffff880205790040)
Stack:
 ffff8801d62099c8 ffff88023ac28520 ffff8801d6209988 ffff88023ac28a40
<d> ffff8801d6209958 ffffffffa0330d56 ffff8801b3de3288 ffff8801b3de3288
<d> ffff8801d62099c8 ffff8801d6209988 ffff8801d6209a18 ffffffffa0328d1a
Call Trace:
 [<ffffffffa0330d56>] rfs_postcall_flts+0x66/0x334 [redirfs]
 [<ffffffffa0328d1a>] rfs_aio_write+0x17a/0x270 [redirfs]
 [<ffffffffa0399584>] secfs_dio+0x614/0x16e0 [secfs2]
 [<ffffffffa0384b8c>] ? op_getxattr+0x10c/0x190 [secfs2]
 [<ffffffff811250f2>] generic_file_direct_write+0xc2/0x190
 [<ffffffff81126a11>] __generic_file_aio_write+0x3a1/0x490
 [<ffffffff8152aebe>] ? mutex_lock+0x1e/0x50
 [<ffffffffa037ed78>] ? sf_acc_cache_check+0x38/0xb0 [secfs2]
 [<ffffffff81126b88>] generic_file_aio_write+0x88/0x100
 [<ffffffffa03807c5>] op_file_aio_write+0x185/0x470 [secfs2]
 [<ffffffffa0328d08>] rfs_aio_write+0x168/0x270 [redirfs]
 [<ffffffffa0328ba0>] ? rfs_aio_write+0x0/0x270 [redirfs]
 [<ffffffff811db1c4>] aio_rw_vect_retry+0x84/0x200
 [<ffffffff811dcb84>] aio_run_iocb+0x64/0x170
 [<ffffffff811ddfb1>] do_io_submit+0x291/0x920
 [<ffffffff811de650>] sys_io_submit+0x10/0x20
 [<ffffffff8100b0f2>] system_call_fastpath+0x16/0x1b
Code: ec 20 48 89 1c 24 4c 89 64 24 08 4c 89 6c 24 10 4c 89 74 24 18 0f 1f 44 00 00 48 8b 06 83 3d 46 a6 00 00 07 49 89 f4 48 8b 58 20 <48> 8b 43 18 4c 8b 68 10 7f 45 48 8b 3d f6 ab 00 00 48 89 de e8 
RIP  [<ffffffffa036a7b1>] gsch_flt_aio_write+0x31/0x120 [gsch]
 RSP <ffff8801d6209908>
CR2: 0000000000000018
(END)