Kernel panics at strlcpy() in using sysdig_probe 3rd party module.

Issue

• Kernel crash with following logs:
  • Example 1 :- BUG: unable to handle kernel NULL pointer dereference at 00000000000001fe
  • Example 2:- BUG: unable to handle kernel paging request at 0000000000002df3

Example 1 :- BUG: unable to handle kernel NULL pointer dereference at 00000000000001fe

BUG: unable to handle kernel NULL pointer dereference at 00000000000001fe
IP: [<ffffffff812a39b5>] strlcpy+0x15/0x60
PGD 77f8f1067 PUD 3bba6f067 PMD 0 
Oops: 0000 [#1] SMP 
last sysfs file: /sys/devices/system/cpu/online
CPU 1 
Modules linked in: talpa_vfshook(U) talpa_pedconnector(U) talpa_vcdevice(U) talpa_core(U) talpa_linux(U) talpa_syscallhook(U) tcp_diag inet_diag fuse gc_enforcement(U) sysdig_probe(U) autofs4 nfs fscache auth_rpcgss nfs_acl 8021q garp stp llc lockd sunrpc talpa_pedevice(U) vsock(U) iptable_nat nf_nat iptable_mangle nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack iptable_filter iptable_raw ip_tables ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 xt_state nf_conntrack ip6table_filter ip6_tables ipv6 uinput ppdev parport_pc parport microcode vmware_balloon sg i2c_piix4 vmci(U) shpchp ext4 jbd2 mbcache sd_mod crc_t10dif sr_mod cdrom vmxnet3 vmw_pvscsi pata_acpi ata_generic ata_piix vmwgfx ttm drm_kms_helper drm i2c_core dm_mirror dm_region_hash dm_log dm_mod [last unloaded: talpa_syscallhook]

Pid: 29105, comm: frmcmp_batch Not tainted 2.6.32-696.6.3.el6.x86_64 #1 VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform
RIP: 0010:[<ffffffff812a39b5>]  [<ffffffff812a39b5>] strlcpy+0x15/0x60
....
Call Trace:
 [<ffffffffa0595f63>] val_to_ring+0x243/0x4d0 [sysdig_probe]
 [<ffffffffa05974b5>] ? f_guardig_generic+0x2a5/0x8620 [sysdig_probe]
 [<ffffffffa05988ca>] f_guardig_generic+0x16ba/0x8620 [sysdig_probe]
 [<ffffffff811f9d0a>] ? load_elf_binary+0xba/0x1b70
 [<ffffffffa0593377>] 0xffffffffa0593377
 [<ffffffff81014b39>] ? read_tsc+0x9/0x20
 [<ffffffffa0593864>] 0xffffffffa0593864
 [<ffffffffa0593b77>] 0xffffffffa0593b77
 [<ffffffff81019b80>] syscall_trace_leave+0xe0/0xf0
 [<ffffffff810095f5>] ? sys_execve+0x55/0x80
 [<ffffffff8100b386>] int_check_syscall_exit_work+0x34/0x3d
Code: c6 04 2e 00 49 8d 04 1c 5b 41 5c 41 5d 41 5e c9 c3 0f 0b eb fe 90 55 48 89 f0 48 89 e5 41 55 41 54 49 89 fc 53 31 db 48 83 ec 08 <80> 3e 00 74 15 66 0f 1f 44 00 00 48 83 c0 01 80 38 00 75 f7 48 
RIP  [<ffffffff812a39b5>] strlcpy+0x15/0x60
 RSP <ffff8807505abc00>
CR2: 00000000000001fe

Example 2:- BUG: unable to handle kernel paging request at 0000000000002df3

BUG: unable to handle kernel paging request at 0000000000002df3
IP: [<ffffffff812a7e65>] strlcpy+0x15/0x60
Kernel PGD 800000001d27a067 PUD 88164067 PMD 0 
User   PGD 1d27a067 PUD 88164067 PMD 0 
Oops: 0000 [#1] SMP 
last sysfs file: /sys/devices/system/cpu/online
CPU 2 
Modules linked in: gc_enforcement(U) sysdig_probe(U) nfsd exportfs autofs4 nfs lockd fscache auth_rpcgss nfs_acl sunrpc ipv6 vsock(U) ext3 jbd ppdev parport_pc parport microcode e1000 vmware_balloon sg vmxnet3 vmci(U) i2c_piix4 shpchp ext4 jbd2 mbcache sd_mod crc_t10dif mptspi mptscsih mptbase scsi_transport_spi pata_acpi ata_generic ata_piix vmwgfx ttm drm_kms_helper drm i2c_core dm_mirror dm_region_hash dm_log dm_mod [last unloaded: speedstep_lib]

Pid: 71930, comm: package_events_ Not tainted 2.6.32-696.30.1.el6.x86_64 #1 VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform
RIP: 0010:[<ffffffff812a7e65>]  [<ffffffff812a7e65>] strlcpy+0x15/0x60
....
Call Trace:
 [<ffffffffa05d5f73>] val_to_ring+0x243/0x4d0 [sysdig_probe]
 [<ffffffffa05d74e5>] ? f_guardig_generic+0x2a5/0x8620 [sysdig_probe]
 [<ffffffffa05d88fa>] f_guardig_generic+0x16ba/0x8620 [sysdig_probe]
 [<ffffffffa05d337a>] 0xffffffffa05d337a
 [<ffffffff810ee760>] ? audit_filter_rules+0x340/0xd80
 [<ffffffff81013559>] ? read_tsc+0x9/0x20
 [<ffffffffa05d3864>] 0xffffffffa05d3864
 [<ffffffffa05d3b77>] 0xffffffffa05d3b77
 [<ffffffff81018c00>] syscall_trace_leave+0xd0/0xe0
 [<ffffffff810095f5>] ? sys_execve+0x55/0x80
 [<ffffffff8155e6fe>] int_check_syscall_exit_work+0x13/0x1c
Code: c6 04 2e 00 49 8d 04 1c 5b 41 5c 41 5d 41 5e c9 c3 0f 0b eb fe 90 55 48 89 f0 48 89 e5 41 55 41 54 49 89 fc 53 31 db 48 83 ec 08 <80> 3e 00 74 15 66 0f 1f 44 00 00 48 83 c0 01 80 38 00 75 f7 48 
RIP  [<ffffffff812a7e65>] strlcpy+0x15/0x60
 RSP <ffff88000e45bc00>
CR2: 0000000000002df3