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From:   Olga Kornievskaia <aglo@umich.edu>
Date:   Thu, 2 Apr 2020 12:41:00 -0400
Message-ID: <CAN-5tyEdabKDZLRJ1kSF2-epLGKwMX5s76OLgQMPOy5ccXFRbQ@mail.gmail.com>
Subject: oops in 5.6-rc
To:     linux-nfs <linux-nfs@vger.kernel.org>
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Sender: linux-nfs-owner@vger.kernel.org
Precedence: bulk

Is this known ops, reproducible 100% with garbage args to mount:
mount -o vers=4.0,sec=shs <serverip>:/<mount> /mnt
My kernel is commit: 0fecfcb9d4d2803079048df7946019463544414e
I haven't bisets but seems to be a recent. My 5.5 kernel works.

localhost login: [  103.982099] BUG: unable to handle page fault for
address: 0000000000020000
[  103.987970] #PF: supervisor read access in kernel mode
[  103.990835] #PF: error_code(0x0000) - not-present page
[  103.993721] PGD 0 P4D 0
[  103.995291] Oops: 0000 [#1] SMP PTI
[  103.997256] CPU: 0 PID: 3059 Comm: mount.nfs Not tainted 5.6.0-rc5+ #295
[  104.000946] Hardware name: VMware, Inc. VMware Virtual
Platform/440BX Desktop Reference Platform, BIOS 6.00 04/13/2018
[  104.007360] RIP: 0010:strcmp+0xc/0x30
[  104.009416] Code: 75 f7 48 83 c6 01 0f b6 4e ff 48 83 c2 01 84 c9
88 4a ff 75 ed f3 c3 0f 1f 80 00 00 00 00 48 83 c7 01 0f b6 47 ff 48
83 c6 01 <3a> 46 ff 75 07 84 c0 75 eb 31 c0 c3 19 c0 83 c8 01 0f 1f 00
c3 0f
[  104.019756] RSP: 0018:ffffc2a0c2207d50 EFLAGS: 00010202
[  104.022659] RAX: 0000000000000073 RBX: ffffffffc0a4f1d0 RCX: 0000000000000000
[  104.026742] RDX: 00000000ffffffff RSI: 0000000000020001 RDI: ffff9ffcabf71df9
[  104.031161] RBP: ffff9ffcabf71df8 R08: 0000000000000000 R09: ffff9ffcabf71dfb
[  104.035410] R10: 000000000000003a R11: 657261687373666e R12: ffff9ffcabf71df8
[  104.039755] R13: ffffc2a0c2207d80 R14: ffff9ffc22037834 R15: 0000000000000020
[  104.044001] FS:  00007f8735790880(0000) GS:ffff9ffcb9e00000(0000)
knlGS:0000000000000000
[  104.048952] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  104.053260] CR: 0000000000020000 CR3: 0000000135210001 CR4: 00000000001606f0
[  104.057233] Call Trace:
[  104.058646]  __lookup_constant+0x2b/0x40
[  104.060839]  lookup_constant+0xd/0x20
[  104.062928]  nfs_fs_context_parse_param+0x1e9/0x920 [nfs]
[  104.065989]  vfs_parse_fs_param+0xd3/0x190
[  104.068303]  vfs_parse_fs_string+0x75/0xb0
[  104.070590]  generic_parse_monolithic+0x8f/0xc0
[  104.073155]  nfs_fs_context_parse_monolithic+0x22b/0x670 [nfs]
[  104.076437]  do_mount+0x626/0x970
[  104.078655]  __x64_sys_mount+0x86/0xd0
[  104.081118]  do_syscall_64+0x55/0x1f0
[  104.083592]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  104.086903] RIP: 0033:0x7f8734e57aaa
[  104.089072] Code: 48 8b 0d e1 33 2c 00 f7 d8 64 89 01 48 83 c8 ff
c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 a5 00 00
00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d ae 33 2c 00 f7 d8 64 89
01 48
[  104.099612] RSP: 002b:00007ffe33f17ba8 EFLAGS: 00000246 ORIG_RAX:
00000000000000a5
[  104.103917] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f8734e57aaa
[  104.107913] RDX: 000056270a7cb260 RSI: 000056270a7cb240 RDI: 000056270a7cb280
[  104.111876] RBP: 00007ffe33f17d20 R08: 000056270a7cb7c0 R09: 000000000000003b
[  104.115864] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe33f17d20
[  104.119811] R13: 000056270a7cb520 R14: 0000000000000010 R15: 00007ffe33f17c30
[  104.124019] Modules linked in: nfs rfcomm fuse bridge stp llc
ip6t_rpfilter ipt_REJECT nf_reject_ipv4 ip6t_REJECT nf_reject_ipv6
xt_conntrack nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ebtable_nat
ebtable_broute ip6table_mangle ip6table_security ip6table_raw
iptable_mangle iptable_security iptable_raw ebtable_filter ebtables
ip6table_filter ip6_tables iptable_filter bnep snd_seq_midi
snd_seq_midi_event crct10dif_pclmul crc32_pclmul ghash_clmulni_intel
btusb btrtl btbcm btintel bluetooth snd_ens1371 uvcvideo
snd_ac97_codec aesni_intel ac97_bus glue_helper snd_seq crypto_simd
cryptd videobuf2_vmalloc videobuf2_memops snd_pcm videobuf2_v4l2
vmw_balloon videodev vmw_vmci snd_timer snd_rawmidi pcspkr
snd_seq_device snd videobuf2_common rfkill ecdh_generic i2c_piix4 ecc
soundcore nfsd nfs_acl lockd auth_rpcgss grace sunrpc ip_tables xfs
libcrc32c vmwgfx sr_mod sd_mod cdrom t10_pi ata_generic pata_acpi
drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm drm
ahci libahci ata_piix
[  104.124052]  libata e1000 mptspi scsi_transport_spi i2c_core
mptscsih crc32c_intel mptbase serio_raw dm_mirror dm_region_hash
dm_log dm_mod
[  104.190925] CR2: 0000000000020000
[  104.192989] ---[ end trace 870843230151cfc0 ]---