Just popped these on a kernel with lots of printks I was working on..
though nothing modified in the rpc code.
I admit to unloading and loading these modules many many times on this
boot cycle.
Did a 'rmmod blocklayoutdriver nfsv4 nfs', and got this:
[527285.455102] nfs4blocklayout_exit: NFSv4 Block Layout Driver
Unregistering...
[527285.455929] pnfs_unregister_layoutdriver Deregistering id:5
[527285.456554] pnfs_unregister_layoutdriver Deregistering id:3
[527285.477422] Key type id_resolver unregistered
[527285.477786] Key type id_legacy unregistered
[527286.625331] BUG: unable to handle kernel paging request at
ffffffffc0216024
[527286.626028] IP: [<ffffffffc01383a3>] call_refresh+0x33/0x60 [sunrpc]
[527286.626628] PGD 1c09067 PUD 1c0b067 PMD 508c6067 PTE 0
[527286.627147] Oops: 0002 [#1] SMP DEBUG_PAGEALLOC
[527286.627555] Modules linked in: cts(E) rpcsec_gss_krb5(E)
dns_resolver(E) xfs(E) libcrc32c(E) crc32c_intel(E) virtio_balloon(E)
nfsd(E) nfs_acl(E) lockd(E) auth_rpcgss(E) grace(E) sunrpc(E) virtio_net
virtio_scsi virtio_blk cirrus drm_kms_helper ttm drm virtio_pci
ata_generic virtio_ring pata_acpi virtio [last unloaded: nfs]
[527286.630415] CPU: 0 PID: 29806 Comm: kworker/0:3 Tainted: G
E 4.7.0-rc7+ #65
[527286.631130] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS 1.8.2-20150714_191134- 04/01/2014
[527286.631979] Workqueue: rpciod rpc_async_schedule [sunrpc]
[527286.632477] task: ffff8800509d8040 ti: ffff88000b718000 task.ti:
ffff88000b718000
[527286.633141] RIP: 0010:[<ffffffffc01383a3>] [<ffffffffc01383a3>]
call_refresh+0x33/0x60 [sunrpc]
[527286.633939] RSP: 0018:ffff88000b71bd98 EFLAGS: 00010246
[527286.634414] RAX: ffffffffc0216000 RBX: ffff88001a2a2ac0 RCX:
dead000000000200
[527286.635048] RDX: 0000000000000001 RSI: 0000000000000000 RDI:
ffff88001a2a2ac0
[527286.635666] RBP: ffff88000b71bda0 R08: ffff88001a2a2b08 R09:
0000000000000000
[527286.636104] R10: 0000000000000000 R11: 0000000000000000 R12:
ffffffffc0138370
[527286.636531] R13: ffffffffc0138370 R14: 0000000000000000 R15:
ffff88001a2a2b00
[527286.636948] FS: 0000000000000000(0000) GS:ffff88007f800000(0000)
knlGS:0000000000000000
[527286.637420] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[527286.637750] CR2: ffffffffc0216024 CR3: 0000000058fe8000 CR4:
00000000001406f0
[527286.638156] Stack:
[527286.638280] ffff88001a2a2ac0 ffff88000b71be08 ffffffffc01441b1
0001880000000000
[527286.638737] ffff88001a2a2af0 ffff88007f818080 ffff88007f818080
0000000000000000
[527286.639192] 0000000041e7793b ffff88001dfba948 ffff88007f817880
ffff88007f821a00
[527286.639650] Call Trace:
[527286.639803] [<ffffffffc01441b1>] __rpc_execute+0x91/0x460 [sunrpc]
[527286.640166] [<ffffffffc0144592>] rpc_async_schedule+0x12/0x20
[sunrpc]
[527286.640545] [<ffffffff810bfbbf>] process_one_work+0x15f/0x410
[527286.640881] [<ffffffff810bfebe>] worker_thread+0x4e/0x480
[527286.641196] [<ffffffff810bfe70>] ? process_one_work+0x410/0x410
[527286.641540] [<ffffffff810bfe70>] ? process_one_work+0x410/0x410
[527286.642685] [<ffffffff810c5858>] kthread+0xd8/0xf0
[527286.643773] [<ffffffff810a49fa>] ?
copy_process.part.33+0xada/0x1950
[527286.644945] [<ffffffff817cc67f>] ret_from_fork+0x1f/0x40
[527286.646193] [<ffffffff810c5780>] ? kthread_worker_fn+0x170/0x170
[527286.647368] Code: 88 03 00 02 55 48 89 e5 53 48 89 fb 75 29 48 8b 83
a8 00 00 00 48 c7 43 20 d0 83 13 c0 48 89 df c7 43 04 00 00 00 00 48 8b
40 58 <83> 40 24 01 e8 e4 fa 00 00 5b 5d c3 0f b7 b7 d8 00 00 00 8b 4f
[527286.650625] RIP [<ffffffffc01383a3>] call_refresh+0x33/0x60
[sunrpc]
[527286.651814] RSP <ffff88000b71bd98>
[527286.652841] CR2: ffffffffc0216024
[527286.655618] ---[ end trace b88f234f4de2dcb0 ]---
[527286.656741] BUG: unable to handle kernel paging request at
ffffffffffffffd8
[527286.658083] IP: [<ffffffff810c5f10>] kthread_data+0x10/0x20
[527286.659367] PGD 1c09067 PUD 1c0b067 PMD 0
[527286.660589] Oops: 0000 [#2] SMP DEBUG_PAGEALLOC
[527286.661850] Modules linked in: cts(E) rpcsec_gss_krb5(E)
dns_resolver(E) xfs(E) libcrc32c(E) crc32c_intel(E) virtio_balloon(E)
nfsd(E) nfs_acl(E) lockd(E) auth_rpcgss(E) grace(E) sunrpc(E) virtio_net
virtio_scsi virtio_blk cirrus drm_kms_helper ttm drm virtio_pci
ata_generic virtio_ring pata_acpi virtio [last unloaded: nfs]
[527286.666334] CPU: 0 PID: 29806 Comm: kworker/0:3 Tainted: G D
E 4.7.0-rc7+ #65
[527286.667680] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS 1.8.2-20150714_191134- 04/01/2014
[527286.669132] task: ffff8800509d8040 ti: ffff88000b718000 task.ti:
ffff88000b718000
[527286.670462] RIP: 0010:[<ffffffff810c5f10>] [<ffffffff810c5f10>]
kthread_data+0x10/0x20
[527286.672011] RSP: 0018:ffff88000b71ba48 EFLAGS: 00010002
[527286.673196] RAX: 0000000000000000 RBX: ffff88007f818080 RCX:
0000000000000000
[527286.674492] RDX: ffff88007f414008 RSI: ffff8800509d80c0 RDI:
ffff8800509d8040
[527286.675973] RBP: ffff88000b71ba48 R08: ffff8800509d80e8 R09:
0000000000000000
[527286.677242] R10: 00000000000003ab R11: ffff8800509d80c0 R12:
0000000000018080
[527286.678476] R13: 0000000000000000 R14: ffff8800509d8040 R15:
ffff88007f818080
[527286.679676] FS: 0000000000000000(0000) GS:ffff88007f800000(0000)
knlGS:0000000000000000
[527286.680942] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[527286.682062] CR2: 0000000000000028 CR3: 0000000058fe8000 CR4:
00000000001406f0
[527286.683260] Stack:
[527286.684205] ffff88000b71ba58 ffffffff810c095e ffff88000b71baa8
ffffffff817c7eb8
[527286.685477] ffff88000b71bac0 ffff8800509d8040 ffff8800509d84d0
ffff88000b71c000
[527286.686775] ffff88000b71baf8 ffff88000b71baf8 ffff88000b71b640
ffff88000b71b640
[527286.688277] Call Trace:
[527286.689225] [<ffffffff810c095e>] wq_worker_sleeping+0xe/0x90
[527286.690344] [<ffffffff817c7eb8>] __schedule+0x4c8/0x730
[527286.691429] [<ffffffff817c8155>] schedule+0x35/0x80
[527286.692483] [<ffffffff810aa8bd>] do_exit+0x78d/0xb00
[527286.693543] [<ffffffff810306fc>] oops_end+0x9c/0xd0
[527286.694595] [<ffffffff81067eaa>] no_context+0x13a/0x380
[527286.695653] [<ffffffff810e1cc7>] ? find_busiest_group+0x47/0x4c0
[527286.696749] [<ffffffff81068171>] __bad_area_nosemaphore+0x81/0x1c0
[527286.698089] [<ffffffff810682c4>] bad_area_nosemaphore+0x14/0x20
[527286.699177] [<ffffffff81068660>] __do_page_fault+0xc0/0x4d0
[527286.700246] [<ffffffff81068b33>] trace_do_page_fault+0x43/0x130
[527286.701339] [<ffffffffc0138370>] ? call_retry_reserve+0x50/0x50
[sunrpc]
[527286.702485] [<ffffffffc0138370>] ? call_retry_reserve+0x50/0x50
[sunrpc]
[527286.703621] [<ffffffff81062c2a>] do_async_page_fault+0x1a/0xa0
[527286.704840] [<ffffffff817ce658>] async_page_fault+0x28/0x30
[527286.706029] [<ffffffffc0138370>] ? call_retry_reserve+0x50/0x50
[sunrpc]
[527286.707173] [<ffffffffc0138370>] ? call_retry_reserve+0x50/0x50
[sunrpc]
[527286.708310] [<ffffffffc01383a3>] ? call_refresh+0x33/0x60 [sunrpc]
[527286.709376] [<ffffffff8102c752>] ? __switch_to+0x2a2/0x4c0
[527286.710427] [<ffffffffc01441b1>] __rpc_execute+0x91/0x460 [sunrpc]
[527286.711494] [<ffffffffc0144592>] rpc_async_schedule+0x12/0x20
[sunrpc]
[527286.712569] [<ffffffff810bfbbf>] process_one_work+0x15f/0x410
[527286.713681] [<ffffffff810bfebe>] worker_thread+0x4e/0x480
[527286.714878] [<ffffffff810bfe70>] ? process_one_work+0x410/0x410
[527286.716188] [<ffffffff810bfe70>] ? process_one_work+0x410/0x410
[527286.717229] [<ffffffff810c5858>] kthread+0xd8/0xf0
[527286.718205] [<ffffffff810a49fa>] ?
copy_process.part.33+0xada/0x1950
[527286.719246] [<ffffffff817cc67f>] ret_from_fork+0x1f/0x40
[527286.720209] [<ffffffff810c5780>] ? kthread_worker_fn+0x170/0x170
[527286.721185] Code: cf 48 89 e7 e8 d2 35 70 00 e9 55 ff ff ff e8 b8 05
fe ff 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 8b 87 30 05 00 00 55 48
89 e5 <48> 8b 40 d8 5d c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00
[527286.724315] RIP [<ffffffff810c5f10>] kthread_data+0x10/0x20
[527286.725260] RSP <ffff88000b71ba48>
[527286.726070] CR2: ffffffffffffffd8
[527286.726859] ---[ end trace b88f234f4de2dcb1 ]---
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