System crashed at kref_get+0xc

Solution Unverified - Updated -


  • System was crashed with the below log in the vmcore
BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [<ffffffff8128596c>] kref_get+0xc/0x30
PGD 239c99067 PUD 23835c067 PMD 0 
Oops: 0000 [#1] SMP 
last sysfs file: /sys/devices/system/cpu/online
CPU 1 
Modules linked in: tcp_diag inet_diag ip6_tables ebtable_nat ebtables ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle iptable_filter ip_tables bridge twnotify(U) target_core_iblock target_core_file target_core_pscsi target_core_mod configfs uio fcoe libfcoe libfc scsi_transport_fc scsi_tgt 8021q garp stp llc cachefiles fscache(T) vsock(U) vhost_net macvtap macvlan tun uinput ppdev vmware_balloon microcode parport_pc parport sg vmci(U) i2c_piix4 i2c_core shpchp ext4 jbd2 mbcache sr_mod cdrom sd_mod crc_t10dif vmxnet3 vmw_pvscsi pata_acpi ata_generic ata_piix dm_mirror dm_region_hash dm_log dm_mod [last unloaded: speedstep_lib]

Pid: 12826, comm: app1 Tainted: G           ---------------  T 2.6.32-431.el6.x86_64 #1 VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform
RIP: 0010:[<ffffffff8128596c>]  [<ffffffff8128596c>] kref_get+0xc/0x30
RSP: 0018:ffff8801abcd5ba8  EFLAGS: 00010292
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff8801abcd5bb8 R08: 0000000000000000 R09: ffff880010334b00
R10: 0000000000000001 R11: 0000000000000001 R12: ffff8801abcd5db8
R13: fffffffffffffffe R14: ffffffff81619260 R15: ffff88007faa6040
FS:  00007f050f5fe700(0000) GS:ffff880028280000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000023b0e4000 CR4: 00000000000407e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process Cy_Proc (pid: 12826, threadinfo ffff8801abcd4000, task ffff88007faa6040)
 ffff8801abcd5bd8 0000000000000000 ffff8801abcd5bd8 ffffffff810d2ee6
<d> ffff8801abcd5db8 ffff8801e87b9540 ffff8801abcd5c48 ffffffff811fcf55
<d> ffff8801abcd5c48 ffff8802143db598 ffff8801abcd5c48 ffff88023ccdd400
Call Trace:
 [<ffffffff810d2ee6>] pidns_get+0x26/0x30
 [<ffffffff811fcf55>] proc_ns_follow_link+0xc5/0x210
 [<ffffffff81199800>] __link_path_walk+0xc40/0xff0
 [<ffffffff811aaa20>] ? mntput_no_expire+0x30/0x110
 [<ffffffff81199e6a>] path_walk+0x6a/0xe0
 [<ffffffff8119a07b>] filename_lookup+0x6b/0xc0
 [<ffffffff811969a6>] ? final_putname+0x26/0x50
 [<ffffffff8119b1a7>] user_path_at+0x57/0xa0
 [<ffffffff810f9302>] ? ring_buffer_lock_reserve+0xa2/0x160
 [<ffffffff8118e9f0>] vfs_fstatat+0x50/0xa0
 [<ffffffff810fe6d3>] ? trace_nowake_buffer_unlock_commit+0x43/0x60
 [<ffffffff8118eb6b>] vfs_stat+0x1b/0x20
 [<ffffffff8118eb94>] sys_newstat+0x24/0x50
 [<ffffffff810197c8>] ? syscall_trace_enter+0x1d8/0x1e0
 [<ffffffff8100b229>] ? tracesys+0x7a/0xde
 [<ffffffff8100b288>] tracesys+0xd9/0xde
Code: 7d 81 e8 18 c5 de ff eb cb be 40 00 00 00 48 c7 c7 bf d8 7d 81 e8 05 c5 de ff eb b8 0f 1f 00 55 48 89 e5 53 48 89 fb 48 83 ec 08 <8b> 07 85 c0 74 0a f0 ff 03 48 83 c4 08 5b c9 c3 be 2b 00 00 00 
RIP  [<ffffffff8128596c>] kref_get+0xc/0x30
 RSP <ffff8801abcd5ba8>
CR2: 0000000000000000


  • Red Hat Enterprise Linux 6.6 or earlier
    • 2.6.32-431.el6
  • Red Hat Enterprise Linux 7.0

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