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SubjectRe: Issues with a rather unusual configured NFS server
A kernel oops (below) is triggered on shutdown with the 3.10.x kernels.
I was referred to this thread by linux-ext4 folks as the related regression/fix.
Is it planned to port the aforementioned patch to the stable kernels? Thanks!

[183727.974779] EXT4-fs (dm-0): sb orphan head is 47193630
[183727.974864] sb_info orphan list:
[183727.974932] inode dm-0:47193630 at ffff8802b98950f0: mode
100644, nlink 0, next 0
[183727.975039] ------------[ cut here ]------------
[183727.975108] kernel BUG at fs/ext4/super.c:804!
[183727.975177] invalid opcode: 0000 [#1] SMP
[183727.975341] Modules linked in: btrfs zlib_deflate ufs qnx4 hfsplus
hfs minix ntfs vfat msdos fat jfs xfs libcrc32c reiserfs ext3 jbd ext2
efivars cpuid fuse ecb pci_stub parport_pc ppdev lp parport
cpufreq_userspace cpufreq_stats cpufreq_conservative cpufreq_powersave
binfmt_misc nfsd auth_rpcgss oid_registry nfs_acl nfs lockd fscache
sunrpc usblp hid_microsoft dm_crypt dm_mod loop ecryptfs joydev
nvidia(PO) snd_hda_codec_realtek snd_hda_intel iTCO_wdt
iTCO_vendor_support snd_hda_codec mxm_wmi evdev snd_hwdep snd_pcm
snd_page_alloc coretemp snd_seq snd_timer snd_seq_device psmouse wmi
serio_raw snd i2c_i801 lpc_ich soundcore mfd_core i2c_core ehci_pci
ehci_hcd acpi_cpufreq mperf processor button thermal_sys ext4 crc16
jbd2 mbcache raid456 async_raid6_recov async_memcpy async_pq async_xor
async_tx xor raid6_pq md_mod sg sr_mod cdrom sd_mod crc_t10dif
hid_generic usbhid hid crc32c_intel ghash_clmulni_intel ahci libahci
libata scsi_mod aesni_intel xhci_hcd aes_x86_64 ablk_helper cryptd lrw
gf128mul glue_helper microcode usbcore usb_common e1000e ptp pps_core
[last unloaded: vboxdrv]
[183727.981527] CPU: 2 PID: 24609 Comm: umount Tainted: P O
3.10.10+mfm #1
[183727.981614] Hardware name: /DZ68BC, BIOS
BCZ6810H.86A.0027.2011.1013.
1636 10/13/2011
[183727.981703] task: ffff8803e7b06810 ti: ffff8803fffe0000 task.ti:
ffff8803fffe0000
[183727.981790] RIP: 0010:[<ffffffffa0209b62>] [<ffffffffa0209b62>]
ext4_put_super+0x256/0x310 [ext4]
[183727.981933] RSP: 0018:ffff8803fffe1e78 EFLAGS: 00010287
[183727.982003] RAX: 0000000000000047 RBX: ffff88040de47000 RCX:
00000000d2a7d2a7
[183727.982088] RDX: 000000000000508c RSI: 0000000000000046 RDI:
ffffffff817a94a4
[183727.982174] RBP: ffff88040beb0800 R08: 0000000000000000 R09:
0000000000000100
[183727.982260] R10: 0000000000000100 R11: 0000000000000100 R12:
ffff88040de47200
[183727.982345] R13: ffff88040de47200 R14: ffff88040de47190 R15:
ffff8803fffe1f38
[183727.982432] FS: 00007fb64bfc17e0(0000) GS:ffff88041f500000(0000)
knlGS:0000000000000000
[183727.982519] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[183727.982590] CR2: 00007f3fd0af4f80 CR3: 00000002e46b5000 CR4:
00000000000407e0
[183727.982676] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
0000000000000000
[183727.982762] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7:
0000000000000400
[183727.982847] Stack:
[183727.982911] ffff880300000000 ffff8803fffe1e78 ffff88040beb0800
ffff88040beb08a0
[183727.983190] ffffffffa0228fb0 ffff88040ea052a0 ffff88040ea05280
ffffffff810f9415
[183727.983468] ffff88041e59dbc0 0000000000000083 ffff88040ea05280
ffffffff810f94ab
[183727.983745] Call Trace:
[183727.983813] [<ffffffff810f9415>] ? generic_shutdown_super+0x4d/0xc5
[183727.983885] [<ffffffff810f94ab>] ? kill_block_super+0x1e/0x5f
[183727.983958] [<ffffffff810f97b2>] ? deactivate_locked_super+0x1b/0x46
[183727.984030] [<ffffffff8110e8b0>] ? SyS_umount+0x2d0/0x2f1
[183727.984102] [<ffffffff8136b912>] ? system_call_fastpath+0x16/0x1b
[183727.984173] Code: c7 c7 04 1b 23 a0 49 8b 54 24 78 48 81 c6 20 03
00 00 89 04 24 31 c0 e8 de 72 15 e1 4d 8b 24 24 4d 39 ec 0f 84 6e ff
ff ff eb b7 <0f> 0b 48 8b bd 20 01 00 00 e8 b5 65 f1 e0 48 8b bb 50 02
00 00
[183727.987403] RIP [<ffffffffa0209b62>] ext4_put_super+0x256/0x310 [ext4]
[183727.987525] RSP <ffff8803fffe1e78>
[183727.987597] ---[ end trace eb19380900af1108 ]---
[183728.094179] EXT4-fs (sda2): re-mounted. Opts: (null)
[184000.112039] SysRq : Keyboard mode set to system default
[184001.631989] SysRq : Terminate All Tasks


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