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[Bug 1396065] [NEW] GPF in lru_put_end called from nfsd_cache_lookup

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Public bug reported:

https://access.redhat.com/solutions/720473 still applies to the trusty
kernel. In fact https://lists.ubuntu.com/archives/kernel-
team/2014-July/045459.html did apply one of the two patches to 3.11, but
it was not applied to 3.13 and is not present in master-next. The other
one is
http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=blobdiff;f=fs/nfsd/nfscache.c;h=e5e4675b7e755fd5c69ea52bc194a25501ef286b;hp=02e8e9ad57502fa2ff294181d6f261425bbc5969;hb=92f9180a0bdcec4a579a4b380cc0fa664f88d47d;hpb=9696a6f0ee3a1ea18b9b705a70eb76883cebe7a0
-- which also landed in 3.11 but didn't make it to 3.13.

Please apply both to fix this backtrace:

Nov 20 16:41:28 REDACTED kernel: [319683.547563] general protection fault: 0000 [#1] SMP 
Nov 20 16:41:28 REDACTED kernel: [319683.552668] Modules linked in: cts des_generic nfsv3 nfsv4 autofs4 binfmt_misc gpio_ich rpcsec_gss_krb5 nfsd nfs_acl auth_rpcgss nfs fscache lockd sunrpc cdc_acm sb_edac edac_core lpc_ich serio_raw mei_me mei mac_hid lp parport raid10 raid456 async_pq async_xor xor async_memcpy async_raid6_recov raid6_pq async_tx bnx2x mpt2sas raid1 ahci scsi_transport_sas libcrc32c libahci mdio raid_class raid0 multipath linear
Nov 20 16:41:28 REDACTED kernel: [319683.590384] CPU: 14 PID: 2576 Comm: nfsd Not tainted 3.13.0-39-generic #66~precise1-Ubuntu
Nov 20 16:41:28 REDACTED kernel: [319683.598737] Hardware name: <REDACTED>
Nov 20 16:41:28 REDACTED kernel: [319683.605802] task: ffff88202704b000 ti: ffff882025e7a000 task.ti: ffff882025e7a000
Nov 20 16:41:28 REDACTED kernel: [319683.613379] RIP: 0010:[<ffffffffa030be70>]  [<ffffffffa030be70>] lru_put_end+0x20/0x70 [nfsd]
Nov 20 16:41:28 REDACTED kernel: [319683.622040] RSP: 0018:ffff882025e7bd58  EFLAGS: 00010206
Nov 20 16:41:28 REDACTED kernel: [319683.627440] RAX: dead000000200200 RBX: ffff880135386e70 RCX: dead000000100100
Nov 20 16:41:28 REDACTED kernel: [319683.634654] RDX: ffff880135386e80 RSI: ffff8802c2a9904c RDI: ffff880135386e70
Nov 20 16:41:28 REDACTED kernel: [319683.641878] RBP: ffff882025e7bd58 R08: ffff88207fcd7220 R09: ffff88103f803b00
Nov 20 16:41:28 REDACTED kernel: [319683.649108] R10: ffffffffa030c908 R11: 0000000000014480 R12: ffff882025b6a000
Nov 20 16:41:28 REDACTED kernel: [319683.656332] R13: 0000000000000002 R14: ffff8802c2a9901c R15: 0000000000000030
Nov 20 16:41:28 REDACTED kernel: [319683.663565] FS:  0000000000000000(0000) GS:ffff88207fcc0000(0000) knlGS:0000000000000000
Nov 20 16:41:28 REDACTED kernel: [319683.671749] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Nov 20 16:41:28 REDACTED kernel: [319683.677581] CR2: 00007fc557e3b504 CR3: 0000000001c0d000 CR4: 00000000000407e0
Nov 20 16:41:28 REDACTED kernel: [319683.684799] Stack:
Nov 20 16:41:28 REDACTED kernel: [319683.686913]  ffff882025e7bda8 ffffffffa030c896 ffff8820289c9240 0000000000000030
Nov 20 16:41:28 REDACTED kernel: [319683.694477]  ffffffffa0339ff8 ffff882025b6a000 ffffffffa0339ff8 ffff8802c2a99018
Nov 20 16:41:28 REDACTED kernel: [319683.702026]  000000000000001c ffff8802c2a99000 ffff882025e7bde8 ffffffffa0300e7a
Nov 20 16:41:28 REDACTED kernel: [319683.709575] Call Trace:
Nov 20 16:41:28 REDACTED kernel: [319683.712132]  [<ffffffffa030c896>] nfsd_cache_update+0x86/0x150 [nfsd]
Nov 20 16:41:28 REDACTED kernel: [319683.718653]  [<ffffffffa0300e7a>] nfsd_dispatch+0x1ba/0x230 [nfsd]
Nov 20 16:41:28 REDACTED kernel: [319683.724936]  [<ffffffffa0238565>] svc_process_common+0x345/0x680 [sunrpc]
Nov 20 16:41:28 REDACTED kernel: [319683.731812]  [<ffffffffa0238bf3>] svc_process+0x103/0x160 [sunrpc]
Nov 20 16:41:28 REDACTED kernel: [319683.738084]  [<ffffffffa03008ff>] nfsd+0xbf/0x130 [nfsd]
Nov 20 16:41:28 REDACTED kernel: [319683.743490]  [<ffffffffa0300840>] ? nfsd_destroy+0x80/0x80 [nfsd]
Nov 20 16:41:28 REDACTED kernel: [319683.749679]  [<ffffffff8108fb29>] kthread+0xc9/0xe0
Nov 20 16:41:28 REDACTED kernel: [319683.754640]  [<ffffffff8108fa60>] ? flush_kthread_worker+0xb0/0xb0
Nov 20 16:41:28 REDACTED kernel: [319683.760932]  [<ffffffff8176b5bc>] ret_from_fork+0x7c/0xb0
Nov 20 16:41:28 REDACTED kernel: [319683.766417]  [<ffffffff8108fa60>] ? flush_kthread_worker+0xb0/0xb0
Nov 20 16:41:28 REDACTED kernel: [319683.772697] Code: 5b 5d c3 0f 1f 84 00 00 00 00 00 66 66 66 66 90 48 8b 05 a4 11 a1 e1 55 48 8d 57 10 48 8b 4f 10 48 89 e5 48 89 47 58 48 8b 47 18 <48> 89 41 08 48 89 08 b9 30 75 00 00 48 8b 05 55 0d 03 00 48 c7 
Nov 20 16:41:28 REDACTED kernel: [319683.792771] RIP  [<ffffffffa030be70>] lru_put_end+0x20/0x70 [nfsd]
Nov 20 16:41:28 REDACTED kernel: [319683.799061]  RSP <ffff882025e7bd58>
Nov 20 16:41:28 REDACTED kernel: [319683.802679] ---[ end trace e4c61e4b0608416b ]---

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: linux-lts-trusty (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: linux (Ubuntu Trusty)
     Importance: Undecided
         Status: New

** Affects: linux-lts-trusty (Ubuntu Trusty)
     Importance: Undecided
         Status: Invalid

** Also affects: linux-lts-trusty (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Trusty)
   Importance: Undecided
       Status: New

** Also affects: linux-lts-trusty (Ubuntu Trusty)
   Importance: Undecided
       Status: New

** Changed in: linux-lts-trusty (Ubuntu Trusty)
       Status: New => Invalid

-- 
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https://bugs.launchpad.net/bugs/1396065

Title:
  GPF in lru_put_end called from nfsd_cache_lookup

Status in “linux” package in Ubuntu:
  New
Status in “linux-lts-trusty” package in Ubuntu:
  New
Status in “linux” source package in Trusty:
  New
Status in “linux-lts-trusty” source package in Trusty:
  Invalid

Bug description:
  https://access.redhat.com/solutions/720473 still applies to the trusty
  kernel. In fact https://lists.ubuntu.com/archives/kernel-
  team/2014-July/045459.html did apply one of the two patches to 3.11,
  but it was not applied to 3.13 and is not present in master-next. The
  other one is
  http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=blobdiff;f=fs/nfsd/nfscache.c;h=e5e4675b7e755fd5c69ea52bc194a25501ef286b;hp=02e8e9ad57502fa2ff294181d6f261425bbc5969;hb=92f9180a0bdcec4a579a4b380cc0fa664f88d47d;hpb=9696a6f0ee3a1ea18b9b705a70eb76883cebe7a0
  -- which also landed in 3.11 but didn't make it to 3.13.

  Please apply both to fix this backtrace:

  Nov 20 16:41:28 REDACTED kernel: [319683.547563] general protection fault: 0000 [#1] SMP 
  Nov 20 16:41:28 REDACTED kernel: [319683.552668] Modules linked in: cts des_generic nfsv3 nfsv4 autofs4 binfmt_misc gpio_ich rpcsec_gss_krb5 nfsd nfs_acl auth_rpcgss nfs fscache lockd sunrpc cdc_acm sb_edac edac_core lpc_ich serio_raw mei_me mei mac_hid lp parport raid10 raid456 async_pq async_xor xor async_memcpy async_raid6_recov raid6_pq async_tx bnx2x mpt2sas raid1 ahci scsi_transport_sas libcrc32c libahci mdio raid_class raid0 multipath linear
  Nov 20 16:41:28 REDACTED kernel: [319683.590384] CPU: 14 PID: 2576 Comm: nfsd Not tainted 3.13.0-39-generic #66~precise1-Ubuntu
  Nov 20 16:41:28 REDACTED kernel: [319683.598737] Hardware name: <REDACTED>
  Nov 20 16:41:28 REDACTED kernel: [319683.605802] task: ffff88202704b000 ti: ffff882025e7a000 task.ti: ffff882025e7a000
  Nov 20 16:41:28 REDACTED kernel: [319683.613379] RIP: 0010:[<ffffffffa030be70>]  [<ffffffffa030be70>] lru_put_end+0x20/0x70 [nfsd]
  Nov 20 16:41:28 REDACTED kernel: [319683.622040] RSP: 0018:ffff882025e7bd58  EFLAGS: 00010206
  Nov 20 16:41:28 REDACTED kernel: [319683.627440] RAX: dead000000200200 RBX: ffff880135386e70 RCX: dead000000100100
  Nov 20 16:41:28 REDACTED kernel: [319683.634654] RDX: ffff880135386e80 RSI: ffff8802c2a9904c RDI: ffff880135386e70
  Nov 20 16:41:28 REDACTED kernel: [319683.641878] RBP: ffff882025e7bd58 R08: ffff88207fcd7220 R09: ffff88103f803b00
  Nov 20 16:41:28 REDACTED kernel: [319683.649108] R10: ffffffffa030c908 R11: 0000000000014480 R12: ffff882025b6a000
  Nov 20 16:41:28 REDACTED kernel: [319683.656332] R13: 0000000000000002 R14: ffff8802c2a9901c R15: 0000000000000030
  Nov 20 16:41:28 REDACTED kernel: [319683.663565] FS:  0000000000000000(0000) GS:ffff88207fcc0000(0000) knlGS:0000000000000000
  Nov 20 16:41:28 REDACTED kernel: [319683.671749] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  Nov 20 16:41:28 REDACTED kernel: [319683.677581] CR2: 00007fc557e3b504 CR3: 0000000001c0d000 CR4: 00000000000407e0
  Nov 20 16:41:28 REDACTED kernel: [319683.684799] Stack:
  Nov 20 16:41:28 REDACTED kernel: [319683.686913]  ffff882025e7bda8 ffffffffa030c896 ffff8820289c9240 0000000000000030
  Nov 20 16:41:28 REDACTED kernel: [319683.694477]  ffffffffa0339ff8 ffff882025b6a000 ffffffffa0339ff8 ffff8802c2a99018
  Nov 20 16:41:28 REDACTED kernel: [319683.702026]  000000000000001c ffff8802c2a99000 ffff882025e7bde8 ffffffffa0300e7a
  Nov 20 16:41:28 REDACTED kernel: [319683.709575] Call Trace:
  Nov 20 16:41:28 REDACTED kernel: [319683.712132]  [<ffffffffa030c896>] nfsd_cache_update+0x86/0x150 [nfsd]
  Nov 20 16:41:28 REDACTED kernel: [319683.718653]  [<ffffffffa0300e7a>] nfsd_dispatch+0x1ba/0x230 [nfsd]
  Nov 20 16:41:28 REDACTED kernel: [319683.724936]  [<ffffffffa0238565>] svc_process_common+0x345/0x680 [sunrpc]
  Nov 20 16:41:28 REDACTED kernel: [319683.731812]  [<ffffffffa0238bf3>] svc_process+0x103/0x160 [sunrpc]
  Nov 20 16:41:28 REDACTED kernel: [319683.738084]  [<ffffffffa03008ff>] nfsd+0xbf/0x130 [nfsd]
  Nov 20 16:41:28 REDACTED kernel: [319683.743490]  [<ffffffffa0300840>] ? nfsd_destroy+0x80/0x80 [nfsd]
  Nov 20 16:41:28 REDACTED kernel: [319683.749679]  [<ffffffff8108fb29>] kthread+0xc9/0xe0
  Nov 20 16:41:28 REDACTED kernel: [319683.754640]  [<ffffffff8108fa60>] ? flush_kthread_worker+0xb0/0xb0
  Nov 20 16:41:28 REDACTED kernel: [319683.760932]  [<ffffffff8176b5bc>] ret_from_fork+0x7c/0xb0
  Nov 20 16:41:28 REDACTED kernel: [319683.766417]  [<ffffffff8108fa60>] ? flush_kthread_worker+0xb0/0xb0
  Nov 20 16:41:28 REDACTED kernel: [319683.772697] Code: 5b 5d c3 0f 1f 84 00 00 00 00 00 66 66 66 66 90 48 8b 05 a4 11 a1 e1 55 48 8d 57 10 48 8b 4f 10 48 89 e5 48 89 47 58 48 8b 47 18 <48> 89 41 08 48 89 08 b9 30 75 00 00 48 8b 05 55 0d 03 00 48 c7 
  Nov 20 16:41:28 REDACTED kernel: [319683.792771] RIP  [<ffffffffa030be70>] lru_put_end+0x20/0x70 [nfsd]
  Nov 20 16:41:28 REDACTED kernel: [319683.799061]  RSP <ffff882025e7bd58>
  Nov 20 16:41:28 REDACTED kernel: [319683.802679] ---[ end trace e4c61e4b0608416b ]---

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