I get this oops with current -git:
[ 3437.018862] PGD 9acab067 PUD 9acaa067 PMD 0
[ 3437.018870] CPU 1
[ 3437.018872] Modules linked in: nfsd exportfs ppdev lp nfs lockd
nfs_acl sunrpc deflate zlib_deflate zlib_inflate twofish twofish_common
camellia serpent blowfish des cbc ecb blkcipher aes xcbc sha256
crypto_null af_key rfcomm l2cap fuse nfnetlink_queue nfnetlink_log
nf_conntrack_netlink nf_nat nf_conntrack_ipv6 nf_conntrack_ipv4
nf_conntrack nfnetlink ip6_tables ip_tables x_tables hangcheck_timer
cpufreq_ondemand powernow_k8 freq_table video backlight thermal
processor fan ide_generic ide_disk ide_cd cdrom generic hci_usb
bluetooth usbhid hid snd_via82xx snd_seq_dummy snd_seq_oss
snd_via82xx_modem snd_ac97_codec ac97_bus snd_seq_midi
snd_seq_midi_event snd_pcm_oss snd_mixer_oss snd_mpu401 snd_pcm
snd_mpu401_uart snd_seq snd_timer snd_rawmidi snd_seq_device parport_pc
snd psmouse parport via82cxxx serio_raw i2c_viapro evdev ehci_hcd sky2
snd_page_alloc uhci_hcd ide_core soundcore pcspkr
[ 3437.018923] Pid: 4432, comm: nfsd Not tainted 2.6.22 #5
[ 3437.018926] RIP: 0010:[<ffffffff81054eff>] [<ffffffff81054eff>]
put_page+0x4/0xb3
[ 3437.018932] RSP: 0018:ffff8101335f5c40 EFLAGS: 00010203
[ 3437.018935] RAX: 0000000000000000 RBX: ffff810133576000 RCX:
ffff8100a0fa5ab8
[ 3437.018938] RDX: ffff810003754428 RSI: ffff8100a0fa5868 RDI:
0000000000000000
[ 3437.018942] RBP: ffff810003754428 R08: ffff8100a1b7c5d8 R09:
ffff8101335f5c10
[ 3437.018946] R10: ffff810003739a78 R11: ffff81009ec61d40 R12:
ffff810133576570
[ 3437.018950] R13: ffff8100a0fa5868 R14: 0000000000001000 R15:
ffff810133576168
[ 3437.018954] FS: 00002ad8e9fab6f0(0000) GS:ffff81013fc72e40(0000)
knlGS:00000000f7e426c0
[ 3437.018957] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 3437.018959] CR2: 0000000000000000 CR3: 000000009a91a000 CR4:
00000000000006e0
[ 3437.018963] Process nfsd (pid: 4432, threadinfo ffff8101335f4000,
task ffff81013f969040)
[ 3437.018965] Stack: ffff810133576000 ffff810003754428
ffff810133576570 ffffffff8830e001
[ 3437.018973] ffff810003747500 ffff8100a0fa5868 ffff8100a0fa5800
ffff8101335f5d80
[ 3437.018978] 0000000000000000 0000000000000000 ffffffff8122c440
ffffffff810892ac
[ 3437.018982] Call Trace:
[ 3437.019002] [<ffffffff8830e001>] :nfsd:nfsd_splice_actor+0x71/0xea
[ 3437.019010] [<ffffffff810892ac>] __splice_from_pipe+0x58/0x1bf
[ 3437.019023] [<ffffffff8830df90>] :nfsd:nfsd_splice_actor+0x0/0xea
[ 3437.019040] [<ffffffff8830d326>]
:nfsd:nfsd_direct_splice_actor+0x10/0x12
[ 3437.019044] [<ffffffff81088efc>] splice_direct_to_actor+0xfd/0x19d
[ 3437.019058] [<ffffffff8830d316>] :nfsd:nfsd_direct_splice_actor+0x0/0x12
[ 3437.019076] [<ffffffff8830d1f4>] :nfsd:nfsd_vfs_read+0x22b/0x34d
[ 3437.019098] [<ffffffff8830d715>] :nfsd:nfsd_read+0xa7/0xc4
[ 3437.019117] [<ffffffff88314539>] :nfsd:nfsd3_proc_read+0x117/0x15a
[ 3437.019133] [<ffffffff8830924d>] :nfsd:nfsd_dispatch+0xdd/0x19e
[ 3437.019156] [<ffffffff88280194>] :sunrpc:svc_process+0x3f3/0x703
[ 3437.019164] [<ffffffff81212423>] __lock_text_start+0x23/0x7e
[ 3437.019180] [<ffffffff88309817>] :nfsd:nfsd+0x193/0x2b0
[ 3437.019188] [<ffffffff8100a9c8>] child_rip+0xa/0x12
[ 3437.019207] [<ffffffff88309684>] :nfsd:nfsd+0x0/0x2b0
[ 3437.019212] [<ffffffff8100a9be>] child_rip+0x0/0x12
[ 3437.019215]
[ 3437.019216]
[ 3437.019217] Code: 8b 07 48 89 fb f6 c4 40 74 09 5b 5d 41 5c e9 42 fb
ff ff f0
It seems to be related to the splice patches. I tried fixing the
crash by adding a NULL ptr check before the first put_page in
nfsd_read_actor, that fixed the crash but the files contained
what looks like random garbage afterwards.
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