Got it again, this time on a different system
running mostly the same software.
This time, I noticed when it happened: on mounting another system's storage over NFS.
I was doing a "mount" command when suddenly this happened. Linux-3.7.3.
[ 3342.841487] ------------[ cut here ]------------
[ 3342.841527] kernel BUG at net/sunrpc/svc_xprt.c:921!
[ 3342.841547] invalid opcode: 0000 [#1] PREEMPT SMP
[ 3342.841579] Modules linked in: nfsv3 nfsv4 sha1_generic ppp_mppe ppp_async crc_ccitt ppp_generic
slhc btusb hid_generic arc4 usbhid hid b43 coretemp kvm_intel kvm mac80211 cfg80211
snd_hda_codec_idt dell_wmi snd_hda_intel snd_hda_codec snd_hwdep snd_pcm_oss snd_mixer_oss snd_pcm
dell_laptop dcdbas snd_seq_dummy snd_seq_oss microcode snd_seq_midi psmouse snd_rawmidi
snd_seq_midi_event snd_seq nouveau ttm drm_kms_helper ssb drm bnep i2c_algo_bit snd_timer i2c_core
mxm_wmi snd_seq_device rfcomm snd bluetooth parport_pc soundcore snd_page_alloc ppdev video nfsd
auth_rpcgss nfs lockd binfmt_misc sunrpc lp parport firewire_ohci tg3 firewire_core crc_itu_t libphy
hwmon sdhci_pci sdhci
[ 3342.842104] CPU 1
[ 3342.842120] Pid: 4108, comm: nfsv4.0-svc Not tainted 3.7.3 #3 Dell Inc. Precision M6300
/0JM680
[ 3342.842151] RIP: 0010:[<ffffffffa007ba6e>] [<ffffffffa007ba6e>] svc_delete_xprt+0x23/0xf3 [sunrpc]
[ 3342.842206] RSP: 0018:ffff8801a680be38 EFLAGS: 00010286
[ 3342.842226] RAX: 00000000ffffffff RBX: ffff880215103000 RCX: dead000000200200
[ 3342.842247] RDX: dead000000100100 RSI: ffff880215103038 RDI: 0000000000000006
[ 3342.842270] RBP: ffff880215726900 R08: 0000000000000606 R09: ffff88021fd11280
[ 3342.842293] R10: 00000000004f9885 R11: ffff88021fd11280 R12: ffff880215726900
[ 3342.842315] R13: ffff880215103038 R14: 0000000000000000 R15: 0000000000000000
[ 3342.842337] FS: 0000000000000000(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
[ 3342.842361] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 3342.842380] CR2: 0000000000b0d000 CR3: 00000001cf402000 CR4: 00000000000007e0
[ 3342.842402] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 3342.842425] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 3342.842448] Process nfsv4.0-svc (pid: 4108, threadinfo ffff8801a680a000, task ffff8802027cf080)
[ 3342.842476] Stack:
[ 3342.842488] dead000000200200 ffff88020970a000 ffff880215103000 ffff880215726900
[ 3342.842527] ffff880215726900 ffffffffa007c960 ffff8801a680bfd8 0000000000011280
[ 3342.842568] ffff8801a680bfd8 ffff88020970a000 ffff88020970a000 ffff8801a680bf08
[ 3342.842608] Call Trace:
[ 3342.842644] [<ffffffffa007c960>] ? svc_recv+0xcc/0x338 [sunrpc]
[ 3342.842678] [<ffffffffa0488000>] ? nfs_callback_authenticate+0x20/0x20 [nfsv4]
[ 3342.842712] [<ffffffffa048801d>] ? nfs4_callback_svc+0x1d/0x3c [nfsv4]
[ 3342.842739] [<ffffffff8103dcf9>] ? kthread+0x81/0x89
[ 3342.842763] [<ffffffff81040101>] ? posix_cpu_nsleep_restart+0x11/0x89
[ 3342.842787] [<ffffffff8103dc78>] ? kthread_freezable_should_stop+0x31/0x31
[ 3342.842813] [<ffffffff8130302c>] ? ret_from_fork+0x7c/0xb0
[ 3342.842835] [<ffffffff8103dc78>] ? kthread_freezable_should_stop+0x31/0x31
[ 3342.842856] Code: c2 84 d2 74 02 eb a0 c3 41 55 4c 8d 6f 38 41 54 4c 89 ee 55 53 48 89 fb 51 48
8b 6f 40 bf 06 00 00 00 e8 62 fa ff ff 85 c0 74 02 <0f> 0b 48 8b 43 08 4c 8d 65 10 48 89 df ff 50 38
4c 89 e7 e8 2a
[ 3342.843192] RIP [<ffffffffa007ba6e>] svc_delete_xprt+0x23/0xf3 [sunrpc]
[ 3342.843235] RSP <ffff8801a680be38>
[ 3342.858471] ---[ end trace f0dbe9f9cd4029c3 ]---
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