RHEL6.5 still panics in ext4_ext_put_in_cache() due to BUG_ON(len == 0).

Issue

• RHEL6.5 server with kernel 2.6.32-431*.el6 or above still panics in ext4_ext_put_in_cache() due to BUG_ON(len == 0) with the message "BUG at fs/ext4/extents.c:2046!"

kernel BUG at fs/ext4/extents.c:2046!
invalid opcode: 0000 [#1] SMP 
last sysfs file: /sys/devices/system/cpu/online
CPU 1 
Modules linked in: iptable_filter ip_tables vsock(U) vmci(U) netconsole configfs autofs4 nfs lockd fscache auth_rpcgss nfs_acl sunrpc ipv6 ppdev vmware_balloon parport_pc parport vmxnet3 i2c_piix4 i2c_core sg shpchp ext4 jbd2 mbcache dm_snapshot sd_mod crc_t10dif sr_mod cdrom vmw_pvscsi pata_acpi ata_generic ata_piix dm_mirror dm_region_hash dm_log dm_mod [last unloaded: scsi_wait_scan]

Pid: 38358, comm: cf-agent Tainted: G        W  ---------------    2.6.32-431.17.1.el6.x86_64 #1 VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform
RIP: 0010:[<ffffffffa00cb037>]  [<ffffffffa00cb037>] ext4_ext_put_in_cache+0x77/0x80 [ext4]
RSP: 0018:ffff8802390bb948  EFLAGS: 00010246
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000035954290
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88010affb4b8
RBP: ffff8802390bb978 R08: ffff880238bdbc30 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000035954290 R14: ffff880152383618 R15: 0000000035954290
FS:  00007f414e653700(0000) GS:ffff880033620000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000e99490 CR3: 0000000239fa9000 CR4: 00000000000007e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process cf-agent (pid: 38358, threadinfo ffff8802390ba000, task ffff8802388ec040)
Stack:
 ffff880000079348 ffff88010affb4b8 ffff88019f6021b8 0000000035954290
<d> ffff880152383618 0000000000000479 ffff8802390bbaf8 ffffffffa00cd5b1
<d> 0000000000000282 0000000000000030 ffff880152383618 ffff8800000685c0
Call Trace:
 [<ffffffffa00cd5b1>] ext4_ext_get_blocks+0x351/0x14b0 [ext4]
 [<ffffffff8112f013>] ? __alloc_pages_nodemask+0x113/0x8d0
 [<ffffffff8117c595>] ? mem_cgroup_charge_common+0xa5/0xd0
 [<ffffffffa00aab9a>] ext4_get_blocks+0x7a/0x2a0 [ext4]
 [<ffffffffa00ab41d>] ext4_get_block+0xbd/0x120 [ext4]
 [<ffffffffa00ad537>] ext4_block_zero_page_range+0x247/0x480 [ext4]
 [<ffffffffa00ad797>] ext4_block_truncate_page+0x27/0x30 [ext4]
 [<ffffffffa00cfab3>] ext4_ext_truncate+0x1c3/0x1f0 [ext4]
 [<ffffffff81148e64>] ? unmap_mapping_range_vma+0x64/0xf0
 [<ffffffffa00adc68>] ext4_truncate+0x4c8/0x6a0 [ext4]
 [<ffffffff8114910b>] ? unmap_mapping_range+0x12b/0x140
 [<ffffffff81137926>] vmtruncate+0x56/0x70
 [<ffffffff811a6be0>] inode_setattr+0x30/0x60
 [<ffffffffa00adf4c>] ext4_setattr+0x10c/0x330 [ext4]
 [<ffffffff811a6fc8>] notify_change+0x168/0x340
 [<ffffffff812824f5>] ? _atomic_dec_and_lock+0x55/0x80
 [<ffffffff81186d24>] do_truncate+0x64/0xa0
 [<ffffffff811870d0>] sys_ftruncate+0x120/0x130
 [<ffffffff8100b072>] system_call_fastpath+0x16/0x1b
Code: a5 4c 03 00 00 4c 89 f0 4d 89 bd 40 03 00 00 c7 00 00 00 00 00 48 8b 5d d8 4c 8b 65 e0 4c 8b 6d e8 4c 8b 75 f0 4c 8b 7d f8 c9 c3 <0f> 0b eb fe 0f 1f 44 00 00 55 48 89 e5 48 83 ec 40 48 89 5d d8 
RIP  [<ffffffffa00cb037>] ext4_ext_put_in_cache+0x77/0x80 [ext4]
 RSP <ffff8802390bb948>