Public bug reported:

== Comment: #0 - Ping Tian Han <[email protected]> - 2016-02-28 21:20:29
==

We have reproduced this problem on 16.04, system thymelp2:

[174373.031624] ------------[ cut here ]------------
[174373.031652] WARNING: at 
/build/linux-5gg68w/linux-4.4.0/fs/btrfs/inode.c:9077
[174373.031656] Modules linked in: mlx4_ib ib_sa ib_mad ib_core ib_addr 
rpadlpar_io rpaphp rpcsec_gss_krb5 nfsv4 nfs fscache binfmt_misc dm_round_robin 
pseries_rng rtc_generic dm_multipath nfsd auth_rpcgss nfs_acl lockd grace 
sunrpc autofs4 btrfs xor raid6_pq mlx4_en vxlan ip6_udp_tunnel udp_tunnel ses 
enclosure mlx4_core ipr
[174373.031699] CPU: 272 PID: 7054 Comm: btrfs-cleaner Not tainted 
4.4.0-6-generic #21-Ubuntu
[174373.031704] task: c00000025a4dba50 ti: c000000258254000 task.ti: 
c000000258254000
[174373.031708] NIP: d000000006f57984 LR: c00000000030324c CTR: d000000006f57920
[174373.031711] REGS: c000000258257960 TRAP: 0700   Not tainted  
(4.4.0-6-generic)
[174373.031714] MSR: 8000000102029033 <SF,VEC,EE,ME,IR,DR,RI,LE>  CR: 28000428  
XER: 00000000
[174373.031724] CFAR: d000000006f57948 SOFTE: 1
GPR00: c00000000030324c c000000258257be0 d000000007017958 c00000019bb01150
GPR04: c00000019bb011d8 0000000000000003 c000000001713900 ffffffffffffffdc
GPR08: 0000000279aa0000 0000000000000001 0000000000000000 d000000006fe57d8
GPR12: d000000006f57920 c000000007b81800 c0000000000e57e8 c0000002432991c0
GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
GPR24: 0000000000000000 0000000000000000 d000000006f38d30 c0000001d62a2000
GPR28: 0000000000000100 c0000001d62a2000 c00000019bb01150 c00000019bb01150
[174373.031789] NIP [d000000006f57984] btrfs_destroy_inode+0x64/0x2f0 [btrfs]
[174373.031796] LR [c00000000030324c] destroy_inode+0x6c/0xc0
[174373.031799] Call Trace:
[174373.031801] [c000000258257be0] [c000000258257cb0] 0xc000000258257cb0 
(unreliable)
[174373.031805] [c000000258257c60] [c00000000030324c] destroy_inode+0x6c/0xc0
[174373.031818] [c000000258257c90] [d000000006f4a560] 
btrfs_run_delayed_iputs+0x110/0x180 [btrfs]
[174373.031831] [c000000258257cf0] [d000000006f38de8] 
cleaner_kthread+0xb8/0x260 [btrfs]
[174373.031837] [c000000258257d80] [c0000000000e58f0] kthread+0x110/0x130
[174373.031842] [c000000258257e30] [c000000000009538] 
ret_from_kernel_thread+0x5c/0xa4
[174373.031846] Instruction dump:
[174373.031849] ebbefe50 312affff 7d295110 0b090000 e95e01b8 312affff 7d295110 
0b090000
[174373.031856] 813effdc 7d290034 5529d97e 69290001 <0b090000> 813effe0 
7d290034 5529d97e
[174373.031863] ---[ end trace c432e7963b62c138 ]---

== Comment: #1 - Ping Tian Han <[email protected]> - 2016-03-08 00:53:19 ==
This message was seen on pinelp2:

[589315.786610] ------------[ cut here ]------------
[589315.786657] WARNING: at 
/build/linux-vzkwLP/linux-4.4.0/fs/btrfs/inode.c:9077
[589315.786670] Modules linked in: nls_utf8 ufs qnx4 hfsplus hfs minix ntfs 
msdos jfs nfsv3 xfs dm_round_robin rpcsec_gss_krb5 nfsv4 nfs fscache 
binfmt_misc pseries_rng dm_multipath rtc_generic nfsd auth_rpcgss nfs_acl lockd 
grace sunrpc autofs4 btrfs xor raid6_pq uas usb_storage bnx2x lpfc ibmveth 
vxlan ip6_udp_tunnel udp_tunnel mdio libcrc32c scsi_transport_fc
[589315.790169] CPU: 14 PID: 5903 Comm: btrfs-cleaner Tainted: G        W       
4.4.0-8-generic #23-Ubuntu
[589315.790186] task: c00000027269e470 ti: c0000000fdc94000 task.ti: 
c0000000fdc94000
[589315.790200] NIP: d000000003ab7984 LR: c000000000303e0c CTR: d000000003ab7920
[589315.790214] REGS: c0000000fdc97960 TRAP: 0700   Tainted: G        W        
(4.4.0-8-generic)
[589315.790227] MSR: 8000000100029033 <SF,EE,ME,IR,DR,RI,LE>  CR: 24c97428  
XER: 00000000
[589315.790266] CFAR: d000000003ab7948 SOFTE: 1
GPR00: c000000000303e0c c0000000fdc97be0 d000000003b77958 c00000018526d0b8
GPR04: c00000018526d140 0000000000000003 c000000001713900 ffffffffffffffdc
GPR08: 000000027ec20000 0000000000000001 0000000000000000 d000000003b457d8
GPR12: d000000003ab7920 c00000000e7e8500 c0000000000e5888 c00000026d05c900
GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
GPR24: 0000000000000000 0000000000000000 d000000003a98d30 c000000269e2c000
GPR28: 0000000000000100 c000000269e2c000 c00000018526d0b8 c00000018526d0b8
[589315.790487] NIP [d000000003ab7984] btrfs_destroy_inode+0x64/0x2f0 [btrfs]
[589315.790505] LR [c000000000303e0c] destroy_inode+0x6c/0xc0
[589315.790515] Call Trace:
[589315.790525] [c0000000fdc97be0] [c0000000fdc97cb0] 0xc0000000fdc97cb0 
(unreliable)
[589315.790545] [c0000000fdc97c60] [c000000000303e0c] destroy_inode+0x6c/0xc0
[589315.790599] [c0000000fdc97c90] [d000000003aaa560] 
btrfs_run_delayed_iputs+0x110/0x180 [btrfs]
[589315.790658] [c0000000fdc97cf0] [d000000003a98de8] 
cleaner_kthread+0xb8/0x260 [btrfs]
[589315.790677] [c0000000fdc97d80] [c0000000000e5990] kthread+0x110/0x130
[589315.790696] [c0000000fdc97e30] [c000000000009538] 
ret_from_kernel_thread+0x5c/0xa4
[589315.790709] Instruction dump:
[589315.790721] ebbefe50 312affff 7d295110 0b090000 e95e01b8 312affff 7d295110 
0b090000
[589315.790753] 813effdc 7d290034 5529d97e 69290001 <0b090000> 813effe0 
7d290034 5529d97e
[589315.790786] ---[ end trace 25b1f33fdabd87c0 ]---

== Comment: #2 - Ping Tian Han <[email protected]> - 2016-04-11 21:39:47 ==
Problem was reproduced with 4.4.0-17-generic:

[338813.049764] ------------[ cut here ]------------
[338813.049791] WARNING: at 
/build/linux-0ABLj6/linux-4.4.0/fs/btrfs/inode.c:9102
[338813.049794] Modules linked in: lz4_compress xfs libcrc32c rpadlpar_io 
rpaphp dccp_diag dccp tcp_diag udp_diag
 inet_diag unix_diag af_packet_diag rpcsec_gss_krb5 nfsv4 netlink_diag nfs 
fscache rdma_ucm(OE) ib_ucm(OE) rdma_c
m(OE) iw_cm(OE) configfs ib_ipoib(OE) ib_cm(OE) ib_uverbs(OE) ib_umad(OE) 
mlx5_ib(OE) mlx5_core(OE) mlx4_ib(OE) ib_sa(OE) ib_mad(OE) ib_core(OE) 
ib_addr(OE) binfmt_misc pseries_rng rtc_generic nfsd auth_rpcgss nfs_acl lockd 
grace sunrpc knem(OE) autofs4 btrfs xor dm_round_robin raid6_pq mlx4_en(OE) 
vxlan ip6_udp_tunnel udp_tunnel ses enclosure mlx4_core(OE) ipr mlx_compat(OE) 
dm_multipath [last unloaded: zram]
[338813.049858] CPU: 56 PID: 10886 Comm: btrfs-cleaner Tainted: G        W  OE  
 4.4.0-17-generic #33-Ubuntu
[338813.049863] task: c0000001e0816610 ti: c0000002400c8000 task.ti: 
c0000002400c8000
[338813.049867] NIP: d000000007958324 LR: c000000000306f8c CTR: d0000000079582c0
[338813.049870] REGS: c0000002400cb970 TRAP: 0700   Tainted: G        W  OE    
(4.4.0-17-generic)
[338813.049873] MSR: 8000000102029033 <SF,VEC,EE,ME,IR,DR,RI,LE>  CR: 24000428  
XER: 00000000
[338813.049883] CFAR: d0000000079582e8 SOFTE: 1
GPR00: c000000000306f8c c0000002400cbbf0 d000000007a18968 c000000116ac8e50
GPR04: c000000116ac8ed8 0000000000000003 c000000001734000 ffffffffffffffdc
GPR08: 0000000276480000 0000000000000001 0000000000000000 d0000000079e66f8
GPR12: d0000000079582c0 c000000007b01400 c0000000000e6168 c00000023fb159c0
GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
GPR24: 0000000000000000 0000000000000000 d0000000079393d0 0000000000000000
GPR28: 0000000000000100 c00000022ea06800 c000000116ac8e50 c000000116ac8e50
[338813.049952] NIP [d000000007958324] btrfs_destroy_inode+0x64/0x2f0 [btrfs]
[338813.049961] LR [c000000000306f8c] destroy_inode+0x6c/0xc0
[338813.049963] Call Trace:
[338813.049965] [c0000002400cbbf0] [c0000002400cbcc0] 0xc0000002400cbcc0 
(unreliable)
[338813.049970] [c0000002400cbc70] [c000000000306f8c] destroy_inode+0x6c/0xc0
[338813.049983] [c0000002400cbca0] [d00000000794ae60] 
btrfs_run_delayed_iputs+0x100/0x160 [btrfs]
[338813.049997] [c0000002400cbcf0] [d000000007939554] 
cleaner_kthread+0x184/0x280 [btrfs]
[338813.050004] [c0000002400cbd80] [c0000000000e6270] kthread+0x110/0x130
[338813.050009] [c0000002400cbe30] [c000000000009538] 
ret_from_kernel_thread+0x5c/0xa4
[338813.050012] Instruction dump:
[338813.050014] ebbefe50 312affff 7d295110 0b090000 e95e01b8 312affff 7d295110 
0b090000
[338813.050021] 813effdc 7d290034 5529d97e 69290001 <0b090000> 813effe0 
7d290034 5529d97e
[338813.050028] ---[ end trace 1e29b3cd956c6379 ]---


== Comment: #4 - SANDHYA VENUGOPALA <[email protected]> - 2016-05-23 02:41:15 
==
This problem was also seen on Wily 4.2.0-27-generic as -

WARNING: at /build/linux-lts-wily-QCMxfI/linux-lts-
wily-4.2.0/fs/btrfs/inode.c:8935

---Steps to Reproduce---
 1. install 14.04.4 or 16.04
2. run ISST's test BASE, IO and TCP stress tests

** Affects: btrfs (Ubuntu)
     Importance: Undecided
     Assignee: Taco Screen team (taco-screen-team)
         Status: New


** Tags: architecture-ppc64le bugnameltc-138018 severity-medium 
targetmilestone-inin---

** Tags added: architecture-ppc64le bugnameltc-138018 severity-medium
targetmilestone-inin---

** Changed in: ubuntu
     Assignee: (unassigned) => Taco Screen team (taco-screen-team)

** Package changed: ubuntu => btrfs (Ubuntu)

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https://bugs.launchpad.net/bugs/1584609

Title:
  ISST-LTE: pVM:WARNING: at /build/linux-
  5gg68w/linux-4.4.0/fs/btrfs/inode.c:9077

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