Hello Lars,
Thank you for reporting the issue.
We have a 20.04 kernel update in focal-proposed (version 5.4.0-79.88)
which has the following patch applied which might fix this problem:
NFSv4: Fix a NULL pointer dereference in
pnfs_mark_matching_lsegs_return()
Could you please try running this kernel version and check whether the
bug is really fixed?
Please see https://wiki.ubuntu.com/Testing/EnableProposed for
documentation how to enable and use -proposed.
Thank you!
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https://bugs.launchpad.net/bugs/1936673
Title:
BUG: kernel NULL pointer dereference, address: 0000000000000000
Status in linux package in Ubuntu:
Confirmed
Bug description:
Hi Kernelguys,
after updating my kernel from 5.4.0-74.83-generic to 5.4.0-77.86 I get
a kernelpanic when putting load onto my NFSv4.1 mount.
About the System:
I run a Galera Cluster on a VMWare VM with data stored on a NetApp
system with NFSv4.1:
# grep nfs4 /proc/mounts
server:/GALERANFS_MUC_2_LOG /GALERANFS_MUC_LOG nfs4
rw,noatime,vers=4.1,rsize=65536,wsize=65536,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,clientaddr=nfs-client-ip,local_lock=none,addr=nfs-server-ip
0 0
nfs-server-ip:/GALERANFS_MUC_2_BACKUP /GALERANFS_MUC_BACKUP nfs4
rw,noatime,vers=4.1,rsize=65536,wsize=65536,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,clientaddr=nfs-client-ip,local_lock=none,addr=nfs-server-ip
0 0
nfs-server-ip:/GALERANFS_MUC_2_DATA /GALERANFS_MUC_DATA nfs4
rw,noatime,vers=4.1,rsize=65536,wsize=65536,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,clientaddr=nfs-client-ip,local_lock=none,addr=nfs-server-ip
0 0
The panic I get when I give a little load on the NFS mount with my
mariadb-server is:
Jul 16 15:26:10 maria2021-muc-2 systemd[1]: Starting MariaDB 10.5.11 database
server...
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.549355] BUG: kernel NULL
pointer dereference, address: 0000000000000000
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.551391] #PF: supervisor read
access in kernel mode
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.553377] #PF:
error_code(0x0000) - not-present page
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.555350] PGD 0 P4D 0
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.557268] Oops: 0000 [#7] SMP PTI
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.559186] CPU: 0 PID: 44171
Comm: mysqld Tainted: P D O 5.4.0-77-generic #86-Ubuntu
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.560644] Hardware name: VMware,
Inc. VMware7,1/440BX Desktop Reference Platform, BIOS
VMW71.00V.17369862.B64.2012240522 12/24/2020
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.562497] RIP:
0010:pnfs_mark_matching_lsegs_return+0x108/0x150 [nfsv4]
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.563447] Code: 01 f0 80 4b 40
08 49 8b 06 4c 89 f3 4c 39 75 d0 75 9d 8b 45 bc 85 c0 75 3b 48 8b 4d c8 48 8b
41 38 48 8d 51 38 48 39 c2 74 23 <41>
8b 34 24 48 8b 7d c8 44 89 fa e8 88 e3 ff ff 31 c0 48 83 c4 20
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.565380] RSP:
0018:ffffa6e91c113d68 EFLAGS: 00010283
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.566361] RAX: ffff95e263669540
RBX: ffff95e263669268 RCX: ffff95e263669240
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.567364] RDX: ffff95e263669278
RSI: ffff95e263669540 RDI: ffff95e263669240
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.568358] RBP: ffffa6e91c113db0
R08: 0000000000000064 R09: 0000000000000000
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.569356] R10: ffff95e24b0ed480
R11: 000000000000003d R12: 0000000000000000
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.570355] R13: ffff95e263669278
R14: ffff95e263669268 R15: 0000000000000000
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.571353] FS:
00007f5d988cf800(0000) GS:ffff95e277a00000(0000) knlGS:0000000000000000
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.572340] CS: 0010 DS: 0000 ES:
0000 CR0: 0000000080050033
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.573317] CR2: 0000000000000000
CR3: 00000002229a2003 CR4: 00000000001606f0
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.574289] Call Trace:
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.575260]
_pnfs_return_layout+0x118/0x230 [nfsv4]
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.576272] ?
nfs_inode_detach_delegation+0x29/0x70 [nfsv4]
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.577244]
nfs4_evict_inode+0x70/0x80 [nfsv4]
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.578205] evict+0xd2/0x1b0
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.579174] iput+0x148/0x210
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.580104]
do_unlinkat+0x1c5/0x2d0
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.581014]
__x64_sys_unlink+0x23/0x30
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.581905]
do_syscall_64+0x57/0x190
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.582763]
entry_SYSCALL_64_after_hwframe+0x44/0xa9
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.583615] RIP:
0033:0x7f5d98b78e3b
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.584429] Code: f0 ff ff 73 01
c3 48 8b 0d 52 80 0d 00 f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 84 00 00 00 00 00
f3 0f 1e fa b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 25 80 0d
00 f7 d8 64 89 01 48
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.586086] RSP:
002b:00007fff18df17c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000057
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.586907] RAX: ffffffffffffffda
RBX: 000056024b32e8a0 RCX: 00007f5d98b78e3b
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.587739] RDX: 000000000000000e
RSI: 0000000000000010 RDI: 00007fff18df1910
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.588561] RBP: 00007fff18df1800
R08: 00007fff18df1828 R09: 0000000000000000
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.589368] R10: 00000000000001b6
R11: 0000000000000246 R12: 0000000000000010
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.590157] R13: 0000000000000000
R14: 00007fff18df1910 R15: 00007fff18df1880
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.590981] Modules linked in:
xt_recent btrfs xor zstd_compress raid6_pq ufs qnx4 hfsplus hfs minix ntfs
msdos jfs xfs nfs_layout_nfsv41_files rpcsec_gss_krb5 auth_rpcgss nfsv4 nfs
lockd grace fscache vmw_vsock_vmci_transport vsock nls_iso8859_1 intel_rapl_msr
intel_rapl_common sb_edac crct10dif_pclmul ghash_clmulni_intel aesni_intel
crypto_simd cryptd glue_helper rapl vmw_balloon input_leds joydev serio_raw
vmw_vmci mac_hid nf_log_ipv6 ip6t_REJECT nf_reject_ipv6 xt_hl ip6t_rt
nf_log_ipv4 nf_log_common ipt_REJECT nf_reject_ipv4 xt_LOG xt_comment xt_limit
xt_addrtype xt_tcpudp xt_conntrack nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4
libcrc32c ip6table_filter sch_fq_codel sunrpc ip6_tables iptable_filter
bpfilter ip_tables x_tables autofs4 zfs(PO) zunicode(PO) zlua(PO) zavl(PO)
icp(PO) zcommon(PO) znvpair(PO) spl(O) crc32_pclmul vmwgfx psmouse ttm
drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops drm vmxnet3
vmw_pvscsi i2c_piix4 pata_acpi
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.598044] CR2: 0000000000000000
Jul 16 15:26:10 maria2021-muc-2 kernel: [ 678.599024] ---[ end trace
60579b30ad37024f ]---
# dpkg -l linux-image-5.4.0-77-generic
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-============================-============-============-=================================
ii linux-image-5.4.0-77-generic 5.4.0-77.86 amd64 Signed kernel
image generic
# cat /proc/version_signature
Ubuntu 5.4.0-77.86-generic 5.4.119
Is anyone else having this problem?
Thanks in advance,
Lars
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