https://github.com/torvalds/linux/commit/89a3c9f5b9f0bcaa9aea3e8b2a616fcaea9aad78
SUNRPC: Properly set the @Subbuf parameter of xdr_buf_subsegment()
When I apply that patch to 5.4.0-40-generic the original bug disappears,
however I sometimes still get:
[Mo Jul 13 20:22:53 2020] BUG: unable to handle page fault for address:
ffff98fd15cd0000
[Mo Jul 13 20:22:53 2020] #PF: supervisor write access in kernel mode
[Mo Jul 13 20:22:53 2020] #PF: error_code(0x0003) - permissions violation
[Mo Jul 13 20:22:53 2020] PGD 214c01067 P4D 214c01067 PUD 214c05067 PMD
455d94063 PTE 8000000455cd0061
[Mo Jul 13 20:22:53 2020] Oops: 0003 [#1] SMP PTI
[Mo Jul 13 20:22:53 2020] CPU: 0 PID: 1428 Comm: update-desktop- Tainted: G
OE 5.4.0-40-generic #44
[Mo Jul 13 20:22:53 2020] Hardware name: XXXXXXXXXXX
[Mo Jul 13 20:22:53 2020] RIP: 0010:memcpy_erms+0x6/0x10
[Mo Jul 13 20:22:53 2020] Code: ff 90 90 90 eb 1e 0f 1f 00 48 89 f8 48 89 d1 48
c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 c3 66 0f 1f 44 00 00 48 89 f8 48 89 d1
<f3> a4 c3 0f 1f 80 00 00 00 00 48 89 f8 48 83 fa
20 72 7e 40 38 fe
[Mo Jul 13 20:22:53 2020] RSP: 0018:ffffb4f780bdb610 EFLAGS: 00010286
[Mo Jul 13 20:22:53 2020] RAX: ffff98fd15ccffc4 RBX: ffffb4f780bdba08 RCX:
0000000000000004
[Mo Jul 13 20:22:53 2020] RDX: 0000000000000040 RSI: ffff98fd132eb064 RDI:
ffff98fd15cd0000
[Mo Jul 13 20:22:53 2020] RBP: ffffb4f780bdb640 R08: 0000000000000000 R09:
000000000000015b
[Mo Jul 13 20:22:53 2020] R10: ffffb4f780bdb5e0 R11: ffff98fd10f14850 R12:
0000000000000028
[Mo Jul 13 20:22:53 2020] R13: 0000000000000040 R14: ffff98fd188be280 R15:
0000000000000040
[Mo Jul 13 20:22:53 2020] FS: 00007fea854dcb80(0000) GS:ffff98fd1da00000(0000)
knlGS:0000000000000000
[Mo Jul 13 20:22:53 2020] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[Mo Jul 13 20:22:53 2020] CR2: ffff98fd15cd0000 CR3: 00000004532e0003 CR4:
00000000003606f0
[Mo Jul 13 20:22:53 2020] Call Trace:
[Mo Jul 13 20:22:53 2020] ? _copy_from_pages+0x6f/0xa0 [sunrpc]
[Mo Jul 13 20:22:53 2020] xdr_shrink_pagelen+0x83/0xb0 [sunrpc]
[Mo Jul 13 20:22:53 2020] xdr_align_pages+0x8e/0x1c0 [sunrpc]
[Mo Jul 13 20:22:53 2020] xdr_read_pages+0x18/0x80 [sunrpc]
[Mo Jul 13 20:22:53 2020] nfs4_xdr_dec_readlink+0xea/0x140 [nfsv4]
[Mo Jul 13 20:22:53 2020] rpcauth_unwrap_resp_decode+0x27/0x30 [sunrpc]
[Mo Jul 13 20:22:53 2020] gss_unwrap_resp+0x358/0x5a0 [auth_rpcgss]
[Mo Jul 13 20:22:53 2020] ? call_bind_status+0x290/0x290 [sunrpc]
[Mo Jul 13 20:22:53 2020] rpcauth_unwrap_resp+0x24/0x30 [sunrpc]
[Mo Jul 13 20:22:53 2020] call_decode+0x158/0x1d0 [sunrpc]
[Mo Jul 13 20:22:53 2020] __rpc_execute+0x8c/0x3a0 [sunrpc]
[Mo Jul 13 20:22:53 2020] rpc_execute+0xa0/0xb0 [sunrpc]
[Mo Jul 13 20:22:53 2020] rpc_run_task+0x120/0x150 [sunrpc]
[Mo Jul 13 20:22:53 2020] nfs4_call_sync_custom+0x10/0x30 [nfsv4]
[Mo Jul 13 20:22:53 2020] nfs4_call_sync_sequence+0x65/0x80 [nfsv4]
[Mo Jul 13 20:22:53 2020] _nfs4_proc_readlink+0xa3/0xc0 [nfsv4]
[Mo Jul 13 20:22:53 2020] nfs4_proc_readlink+0x6e/0x100 [nfsv4]
[Mo Jul 13 20:22:53 2020] nfs_symlink_filler+0x33/0x70 [nfs]
[Mo Jul 13 20:22:53 2020] do_read_cache_page+0x2f6/0x830
[Mo Jul 13 20:22:53 2020] ? nfs_get_link+0x120/0x120 [nfs]
[Mo Jul 13 20:22:53 2020] ? xas_load+0xd/0x80
[Mo Jul 13 20:22:53 2020] ? find_get_entry+0x5e/0x170
[Mo Jul 13 20:22:53 2020] ? nfs4_do_check_delegation+0x1d/0x40 [nfsv4]
[Mo Jul 13 20:22:53 2020] ? nfs4_have_delegation+0x13/0x20 [nfsv4]
[Mo Jul 13 20:22:53 2020] ? nfs_check_cache_invalid+0x38/0xa0 [nfs]
[Mo Jul 13 20:22:53 2020] read_cache_page+0x12/0x20
[Mo Jul 13 20:22:53 2020] nfs_get_link+0x47/0x120 [nfs]
[Mo Jul 13 20:22:53 2020] trailing_symlink+0x21d/0x280
[Mo Jul 13 20:22:53 2020] ? nfs_destroy_readpagecache+0x20/0x20 [nfs]
[Mo Jul 13 20:22:53 2020] path_lookupat.isra.0+0x8c/0x230
[Mo Jul 13 20:22:53 2020] ? rpc_free_task+0x64/0x70 [sunrpc]
[Mo Jul 13 20:22:53 2020] ? rpc_do_put_task+0x6a/0x70 [sunrpc]
[Mo Jul 13 20:22:53 2020] filename_lookup+0xae/0x170
[Mo Jul 13 20:22:53 2020] ? strncpy_from_user+0x4c/0x150
[Mo Jul 13 20:22:53 2020] user_path_at_empty+0x3a/0x50
[Mo Jul 13 20:22:53 2020] vfs_statx+0x7d/0xe0
[Mo Jul 13 20:22:53 2020] __do_sys_newstat+0x3e/0x80
[Mo Jul 13 20:22:53 2020] ? _cond_resched+0x19/0x30
[Mo Jul 13 20:22:53 2020] ? exit_to_usermode_loop+0xea/0x160
[Mo Jul 13 20:22:53 2020] __x64_sys_newstat+0x16/0x20
[Mo Jul 13 20:22:53 2020] do_syscall_64+0x57/0x190
[Mo Jul 13 20:22:53 2020] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[Mo Jul 13 20:22:53 2020] RIP: 0033:0x7fea8568449a
--
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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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