Thanks for the advice for bisecting! I found the commits causing the
problem:
After bb4fb62a863ea6131bdac77b21faa9444a605c58 (SUNRPC: Add "@len" parameter to
gss_unwrap()) NFS with Kerberos is completely broken:
$ mount -v /nfs/share
mount.nfs: trying text-based options
'sec=krb5p,soft,intr,bg,timeo=100,retrans=2,vers=4.2,addr=xxxx:xxxx:xxxx:1::1,clientaddr=xxxx:xxxx:xxxx:1::dbfb'
mount.nfs: mount(2): Input/output error
mount.nfs: mount system call failed
After c711ec1aa0c8ff7d979d7f12d1d09df46f349d61 (SUNRPC: Fix GSS privacy
computation of auth->au_ralign) mounts work again but the crashes shown
in the previous comments occur.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1886277
Title:
Regression on NFS: unable to handle page fault in mempool_alloc_slab
Status in linux package in Ubuntu:
Confirmed
Bug description:
On kernel 5.4.0-40-generic in focal I'm getting errors like this on
several machines with different hardware in the first hour after boot:
Jul 04 16:58:32 hostname kernel: BUG: unable to handle page fault for
address: ffff9083e222e632
Jul 04 16:58:32 hostname kernel: #PF: supervisor read access in kernel mode
Jul 04 16:58:32 hostname kernel: #PF: error_code(0x0000) - not-present page
Jul 04 16:58:32 hostname kernel: PGD 3ac205067 P4D 3ac205067 PUD 0
Jul 04 16:58:32 hostname kernel: Oops: 0000 [#1] SMP NOPTI
Jul 04 16:58:32 hostname kernel: CPU: 4 PID: 289 Comm: kworker/u16:4 Tainted:
G OE 5.4.0-40-generic #44-Ubuntu
Jul 04 16:58:32 hostname kernel: Hardware name: LENOVO 20N2CTO1WW/20N2CTO1WW,
BIOS N2IET88W (1.66 ) 04/22/2020
Jul 04 16:58:32 hostname kernel: Workqueue: rpciod rpc_async_schedule [sunrpc]
Jul 04 16:58:32 hostname kernel: RIP: 0010:kmem_cache_alloc+0x7e/0x230
Jul 04 16:58:32 hostname kernel: Code: 99 01 00 00 4d 8b 07 65 49 8b 50 08 65
4c 03 05 40 9d 56 44 4d 8b 20 4d 85 e4 0f 84 85 01 00 00 41 8b 47 20 49 8b 3f
4c 01 e0 <48> 8b 18 48 89 c1 49 33 9f 70 01 00 00 4c 89 e0 48 0f c9 48 31 cb
Jul 04 16:58:32 hostname kernel: RSP: 0018:ffffbc38c046fcc8 EFLAGS: 00010282
Jul 04 16:58:32 hostname kernel: RAX: ffff9083e222e632 RBX: 0000000000000000
RCX: 0000000000000002
Jul 04 16:58:32 hostname kernel: RDX: 0000000000000009 RSI: 0000000000092800
RDI: 0000000000031fb0
Jul 04 16:58:32 hostname kernel: RBP: ffffbc38c046fcf8 R08: ffff90836c331fb0
R09: ffffffffc1436a94
Jul 04 16:58:32 hostname kernel: R10: ffff908368178d2c R11: 0000000000000018
R12: ffff9083e222e632
Jul 04 16:58:32 hostname kernel: R13: 0000000000092800 R14: ffff908367ca6140
R15: ffff908367ca6140
Jul 04 16:58:32 hostname kernel: FS: 0000000000000000(0000)
GS:ffff90836c300000(0000) knlGS:0000000000000000
Jul 04 16:58:32 hostname kernel: CS: 0010 DS: 0000 ES: 0000 CR0:
0000000080050033
Jul 04 16:58:32 hostname kernel: CR2: ffff9083e222e632 CR3: 00000003ab80a003
CR4: 00000000003606e0
Jul 04 16:58:32 hostname kernel: Call Trace:
Jul 04 16:58:32 hostname kernel: ? mempool_alloc_slab+0x17/0x20
Jul 04 16:58:32 hostname kernel: mempool_alloc_slab+0x17/0x20
Jul 04 16:58:32 hostname kernel: mempool_alloc+0x64/0x180
Jul 04 16:58:32 hostname kernel: rpc_malloc+0xa1/0xb0 [sunrpc]
Jul 04 16:58:32 hostname kernel: call_allocate+0xd1/0x1b0 [sunrpc]
Jul 04 16:58:32 hostname kernel: ? call_refreshresult+0x100/0x100 [sunrpc]
Jul 04 16:58:32 hostname kernel: __rpc_execute+0x8c/0x3a0 [sunrpc]
Jul 04 16:58:32 hostname kernel: rpc_async_schedule+0x30/0x50 [sunrpc]
Jul 04 16:58:32 hostname kernel: process_one_work+0x1eb/0x3b0
Jul 04 16:58:32 hostname kernel: worker_thread+0x4d/0x400
Jul 04 16:58:32 hostname kernel: kthread+0x104/0x140
Jul 04 16:58:32 hostname kernel: ? process_one_work+0x3b0/0x3b0
Jul 04 16:58:32 hostname kernel: ? kthread_park+0x90/0x90
Jul 04 16:58:32 hostname kernel: ret_from_fork+0x35/0x40
Jul 04 16:58:32 hostname kernel: Modules linked in: rfcomm rpcsec_gss_krb5
auth_rpcgss nfsv4 nfs lockd grace fscache vboxnetadp(OE) vboxnetflt(OE)
vboxdrv(OE) msr ccm cmac algif_hash algif_skcipher af_alg aufs bnep overlay
nls_iso8859_1 mei_hdcp intel_rapl_msr snd_s>
Jul 04 16:58:32 hostname kernel: nvram ledtrig_audio mei_me cfg80211 mei
processor_thermal_device snd_seq ucsi_acpi typec_ucsi intel_rapl_common
intel_soc_dts_iosf snd_seq_device typec intel_pch_thermal snd_timer snd
int3403_thermal soundcore int340x_thermal_zone i>
Jul 04 16:58:32 hostname kernel: pinctrl_cannonlake video pinctrl_intel
Jul 04 16:58:32 hostname kernel: CR2: ffff9083e222e632
Jul 04 16:58:32 hostname kernel: ---[ end trace cbbaed921eb439ce ]---
Jul 04 16:58:32 hostname kernel: RIP: 0010:kmem_cache_alloc+0x7e/0x230
Jul 04 16:58:32 hostname kernel: Code: 99 01 00 00 4d 8b 07 65 49 8b 50 08 65
4c 03 05 40 9d 56 44 4d 8b 20 4d 85 e4 0f 84 85 01 00 00 41 8b 47 20 49 8b 3f
4c 01 e0 <48> 8b 18 48 89 c1 49 33 9f 70 01 00 00 4c 89 e0 48 0f c9 48 31 cb
Jul 04 16:58:32 hostname kernel: RSP: 0018:ffffbc38c046fcc8 EFLAGS: 00010282
Jul 04 16:58:32 hostname kernel: RAX: ffff9083e222e632 RBX: 0000000000000000
RCX: 0000000000000002
Jul 04 16:58:32 hostname kernel: RDX: 0000000000000009 RSI: 0000000000092800
RDI: 0000000000031fb0
Jul 04 16:58:32 hostname kernel: RBP: ffffbc38c046fcf8 R08: ffff90836c331fb0
R09: ffffffffc1436a94
Jul 04 16:58:32 hostname kernel: R10: ffff908368178d2c R11: 0000000000000018
R12: ffff9083e222e632
Jul 04 16:58:32 hostname kernel: R13: 0000000000092800 R14: ffff908367ca6140
R15: ffff908367ca6140
Jul 04 16:58:32 hostname kernel: FS: 0000000000000000(0000)
GS:ffff90836c300000(0000) knlGS:0000000000000000
Jul 04 16:58:32 hostname kernel: CS: 0010 DS: 0000 ES: 0000 CR0:
0000000080050033
Jul 04 16:58:32 hostname kernel: CR2: ffff9083e222e632 CR3: 00000003ab80a003
CR4: 00000000003606e0
When booting 5.4.0-39-generic the problem does not occur.
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27.3
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: lsysadmin 2042 F.... pulseaudio
CasperMD5CheckResult: skip
DistroRelease: Ubuntu 20.04
HibernationDevice: RESUME=UUID=9d3714bb-8799-42f9-a51d-790f87b0a7fc
MachineType: LENOVO 20N2CTO1WW
Package: linux (not installed)
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-40-generic
root=/dev/mapper/vgmagiko-root ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 5.4.0-40.44-generic 5.4.44
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
linux-restricted-modules-5.4.0-40-generic N/A
linux-backports-modules-5.4.0-40-generic N/A
linux-firmware 1.187.1
Tags: focal
Uname: Linux 5.4.0-40-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: N/A
_MarkForUpload: True
dmi.bios.date: 04/22/2020
dmi.bios.vendor: LENOVO
dmi.bios.version: N2IET88W (1.66 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20N2CTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40709 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias:
dmi:bvnLENOVO:bvrN2IET88W(1.66):bd04/22/2020:svnLENOVO:pn20N2CTO1WW:pvrThinkPadT490:rvnLENOVO:rn20N2CTO1WW:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad T490
dmi.product.name: 20N2CTO1WW
dmi.product.sku: LENOVO_MT_20N2_BU_Think_FM_ThinkPad T490
dmi.product.version: ThinkPad T490
dmi.sys.vendor: LENOVO
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