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Date:   Thu, 2 Apr 2020 17:18:44 -0400
From:   Scott Mayhew <smayhew@redhat.com>
To:     Trond Myklebust <trondmy@hammerspace.com>
Cc:     "linux-nfs@vger.kernel.org" <linux-nfs@vger.kernel.org>,
        "aglo@umich.edu" <aglo@umich.edu>
Subject: Re: oops in 5.6-rc
Message-ID: <20200402211844.GA4386@aion.usersys.redhat.com>
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 <2a088f5f4a25ce3ee548b0e32ae2c181ef90b98e.camel@hammerspace.com>
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On Thu, 02 Apr 2020, Trond Myklebust wrote:

> On Thu, 2020-04-02 at 12:41 -0400, Olga Kornievskaia wrote:
> > 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 ]---
> 
> That is the mount code rewrite that went into 5.6.

Doh!  Patch incoming.

-Scott
> 
> -- 
> Trond Myklebust
> Linux NFS client maintainer, Hammerspace
> trond.myklebust@hammerspace.com
> 
>