Huh. Does SCSI core not do a get_device() before actually scanning? It
looks to me like the disconnect path did it's scsi_host_put and the host
(and struct us_data) got freed immediately.
Matt
On Mon, Jun 23, 2008 at 11:58:32PM +0200, Rafael J. Wysocki wrote:
quoted text > On Monday, 23 of June 2008, R. J. Wysocki wrote:
> > [sorry for the broken USB list address in the original post.]
>=20
> [and now my univeristy address instead of the usual one ...]
>=20
> > On Monday, 23 of June 2008, Rafael J. Wysocki wrote:
> > > Hi,
> > >=20
> > > This has just happened to me with -rc7-git1 while trying to use a not
> > > sufficiently powered external disk (we should survive that IMO):
> > >=20
> > > usb 6-3: new high speed USB device using ehci_hcd and address 9
> > > usb 6-3: device descriptor read/64, error -110
> > > usb 6-3: device descriptor read/64, error -110
> > > usb 6-3: new high speed USB device using ehci_hcd and address 10
> > > usb 6-3: device descriptor read/64, error -110
> > > usb 6-3: device descriptor read/64, error -110
> > > usb 6-3: new high speed USB device using ehci_hcd and address 11
> > > usb 6-3: device not accepting address 11, error -110
> > > usb 6-3: new high speed USB device using ehci_hcd and address 12
> > > usb 6-3: device not accepting address 12, error -110
> > > hub 6-0:1.0: unable to enumerate USB device on port 3
> > > usb 2-1: new full speed USB device using ohci_hcd and address 2
> > > usb 2-1: not running at top speed; connect to a high speed hub
> > > usb 2-1: configuration #1 chosen from 1 choice
> > > usb 2-1: New USB device found, idVendor=3D04cf, idProduct=3D8818
> > > usb 2-1: New USB device strings: Mfr=3D1, Product=3D2, SerialNumber=
=3D3
quoted text > > > usb 2-1: Product: USB Mass Storage Device
> > > usb 2-1: Manufacturer: Myson Century, Inc.
> > > usb 2-1: SerialNumber: 100
> > > Initializing USB Mass Storage driver...
> > > scsi12 : SCSI emulation for USB Mass Storage devices
> > > usb-storage: device found at 2
> > > usb-storage: waiting for device to settle before scanning
> > > usbcore: registered new interface driver usb-storage
> > > USB Mass Storage support registered.
> > > scsi 12:0:0:0: Direct-Access IC25N060 ATMR04-0 MO3O PQ: 0=
ANSI: 0 CCS
quoted text > > > sd 12:0:0:0: [sdc] 117210240 512-byte hardware sectors (60012 MB)
> > > sd 12:0:0:0: [sdc] Write Protect is off
> > > sd 12:0:0:0: [sdc] Mode Sense: 00 14 00 00
> > > sd 12:0:0:0: [sdc] Assuming drive cache: write through
> > > sd 12:0:0:0: [sdc] 117210240 512-byte hardware sectors (60012 MB)
> > > sd 12:0:0:0: [sdc] Write Protect is off
> > > sd 12:0:0:0: [sdc] Mode Sense: 00 14 00 00
> > > sd 12:0:0:0: [sdc] Assuming drive cache: write through
> > > sdc:<6>usb 2-1: USB disconnect, address 2
> > > sd 12:0:0:0: [sdc] Result: hostbyte=3DDID_ERROR driverbyte=3DDRIVER_O=
K,SUGGEST_OK
quoted text > > > end_request: I/O error, dev sdc, sector 0
> > > Buffer I/O error on device sdc, logical block 0
> > > sd 12:0:0:0: [sdc] Result: hostbyte=3DDID_ERROR driverbyte=3DDRIVER_O=
K,SUGGEST_OK
quoted text > > > end_request: I/O error, dev sdc, sector 0
> > > Buffer I/O error on device sdc, logical block 0
> > > unable to read partition table
> > > sd 12:0:0:0: [sdc] Attached SCSI disk
> > > sd 12:0:0:0: Attached scsi generic sg3 type 0
> > > BUG: unable to handle kernel NULL pointer dereference at 000000000000=
0004
quoted text > > > IP: [<ffffffffa038e6f1>] :usb_storage:slave_alloc+0x41/0x80
> > > PGD 1260ff067 PUD 119076067 PMD 0=20
> > > Oops: 0000 [1] SMP=20
> > > CPU 3=20
> > > Modules linked in: usb_storage parport_pc lp parport usblp nfsd lockd=
auth_rpcgss sunrpc exportfs iptable_filter ip_tables ip6table_filter ip6_t=
ables x_tables ipv6 cpufreq_conservative cpufreq_ondemand cpufreq_userspace=
cpufreq_powersave powernow_k8 freq_table snd_pcm_oss snd_mixer_oss snd_seq=
snd_seq_device reiserfs dm_mod ohci1394 sr_mod cdrom floppy ieee1394 serio=
_raw rtc_cmos sky2 wmi snd_hda_intel rtc_core sg rtc_lib joydev snd_pcm snd=
_timer snd_page_alloc snd_hwdep snd evdev button soundcore raid456 async_xo=
r async_memcpy async_tx xor raid0 usbhid ff_memless ehci_hcd ohci_hcd sd_mo=
d edd raid1 ext3 jbd fan pata_marvell pata_atiixp thermal processor
quoted text > > > Pid: 9319, comm: usb-stor-scan Not tainted 2.6.26-rc7 #196
> > > RIP: 0010:[<ffffffffa038e6f1>] [<ffffffffa038e6f1>] :usb_storage:sla=
ve_alloc+0x41/0x80
quoted text > > > RSP: 0018:ffff8100a20cdb60 EFLAGS: 00010202
> > > RAX: 0000000000000000 RBX: ffff810087d828d0 RCX: 0000000000000003
> > > RDX: ffff8101275f08e0 RSI: ffff810086cc49d0 RDI: ffff810124144b90
> > > RBP: ffff8100a20cdb70 R08: 0000000000000001 R09: 0000000000000000
> > > R10: ffffffff807fe7e0 R11: 0000000000000000 R12: ffff810087499000
> > > R13: ffff810124953678 R14: ffff810087d82000 R15: 0000000000000000
> > > FS: 00007f22f6561700(0000) GS:ffff810127c997c0(0000) knlGS:00000000e=
eb1db90
quoted text > > > CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
> > > CR2: 0000000000000004 CR3: 0000000122089000 CR4: 00000000000006e0
> > > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> > > DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> > > Process usb-stor-scan (pid: 9319, threadinfo ffff8100a20cc000, task f=
fff810086cc4300)
quoted text > > > Stack: ffff810087499000 ffff810124953650 ffff8100a20cdbb0 ffffffff80=
3ea940
quoted text > > > ffff8100a20cdbb0 ffff810087d82000 0000000000000000 0000000000000000
> > > ffff810124953678 0000000000000000 ffff8100a20cdcf0 ffffffff803eac9a
> > > Call Trace:
> > > [<ffffffff803ea940>] scsi_alloc_sdev+0x1e0/0x250
> > > [<ffffffff803eac9a>] scsi_probe_and_add_lun+0x12a/0xc20
> > > [<ffffffff803ebd4f>] __scsi_scan_target+0x3bf/0x6c0
> > > [<ffffffff8025db46>] ? mark_held_locks+0x56/0xa0
> > > [<ffffffff804ebbe9>] ? mutex_lock_nested+0x1b9/0x290
> > > [<ffffffff8025dcdf>] ? trace_hardirqs_on+0xbf/0x150
> > > [<ffffffff803ec0da>] scsi_scan_channel+0x8a/0xa0
> > > [<ffffffff803ec1e8>] scsi_scan_host_selected+0xf8/0x160
> > > [<ffffffff803ec2ce>] do_scsi_scan_host+0x7e/0x80
> > > [<ffffffff803ec850>] scsi_scan_host+0x190/0x1d0
> > > [<ffffffffa0390f3d>] :usb_storage:usb_stor_scan_thread+0x6d/0x1c0
> > > [<ffffffff8024f790>] ? autoremove_wake_function+0x0/0x40
> > > [<ffffffffa0390ed0>] ? :usb_storage:usb_stor_scan_thread+0x0/0x1c0
> > > [<ffffffff8024f33d>] kthread+0x4d/0x80
> > > [<ffffffff8020c608>] child_rip+0xa/0x12
> > > [<ffffffff8020bd1f>] ? restore_args+0x0/0x30
> > > [<ffffffff8024f2f0>] ? kthread+0x0/0x80
> > > [<ffffffff8020c5fe>] ? child_rip+0x0/0x12
> > >=20
> > >=20
> > > Code: 1f c6 87 c3 00 00 00 24 48 8b 7f 08 48 81 c3 d0 08 00 00 8b 83 =
9c 00 00 00 48 8b 53 78 c1 e8 0f 83 e0 0f 48 8b 84 c2 e8 03 00 00 <0f> b7 7=
0 04 ff ce e8 44 d9 fb df 80 bb c4 00 00 00 04 75 12 49=20
quoted text > > > RIP [<ffffffffa038e6f1>] :usb_storage:slave_alloc+0x41/0x80
> > > RSP <ffff8100a20cdb60>
> > > CR2: 0000000000000004
> > > ---[ end trace 2077f860f94c5bf3 ]---
> > > sd 12:0:0:0: [sdc] Result: hostbyte=3DDID_NO_CONNECT driverbyte=3DDRI=
VER_OK,SUGGEST_OK
quoted text > > > end_request: I/O error, dev sdc, sector 0
> > > Buffer I/O error on device sdc, logical block 0
> > > Buffer I/O error on device sdc, logical block 1
> > > Buffer I/O error on device sdc, logical block 2
> > > Buffer I/O error on device sdc, logical block 3
> > > sd 12:0:0:0: [sdc] Result: hostbyte=3DDID_NO_CONNECT driverbyte=3DDRI=
VER_OK,SUGGEST_OK
quoted text > > > end_request: I/O error, dev sdc, sector 0
> > > Buffer I/O error on device sdc, logical block 0
> > > sd 12:0:0:0: [sdc] Result: hostbyte=3DDID_NO_CONNECT driverbyte=3DDRI=
VER_OK,SUGGEST_OK
quoted text > > > end_request: I/O error, dev sdc, sector 117210112
> > > Buffer I/O error on device sdc, logical block 14651264
> > > sd 12:0:0:0: [sdc] Result: hostbyte=3DDID_NO_CONNECT driverbyte=3DDRI=
VER_OK,SUGGEST_OK
quoted text > > > end_request: I/O error, dev sdc, sector 117210112
> > > Buffer I/O error on device sdc, logical block 14651264
> > > sd 12:0:0:0: [sdc] Result: hostbyte=3DDID_NO_CONNECT driverbyte=3DDRI=
VER_OK,SUGGEST_OK
quoted text > > > end_request: I/O error, dev sdc, sector 117210112
> > > Buffer I/O error on device sdc, logical block 14651264
> > > sd 12:0:0:0: [sdc] Result: hostbyte=3DDID_NO_CONNECT driverbyte=3DDRI=
VER_OK,SUGGEST_OK
quoted text > > > end_request: I/O error, dev sdc, sector 0
> > > sd 12:0:0:0: [sdc] Result: hostbyte=3DDID_NO_CONNECT driverbyte=3DDRI=
VER_OK,SUGGEST_OK
quoted text > > > end_request: I/O error, dev sdc, sector 0
> > > sd 12:0:0:0: [sdc] Result: hostbyte=3DDID_NO_CONNECT driverbyte=3DDRI=
VER_OK,SUGGEST_OK
quoted text > > > end_request: I/O error, dev sdc, sector 0
> > > sd 12:0:0:0: [sdc] Result: hostbyte=3DDID_NO_CONNECT driverbyte=3DDRI=
VER_OK,SUGGEST_OK
quoted text > > > end_request: I/O error, dev sdc, sector 117210232
> > >=20
> > > It resulted in usb-storage being unusable and a system reboot.
> > >=20
> > > Thanks,
> > > Rafael
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--=20
Matthew Dharm Home: mdharm-usb@one-eyed-alien.=
net=20
Maintainer, Linux USB Mass Storage Driver
S: Another stupid question?
G: There's no such thing as a stupid question, only stupid people.
-- Stef and Greg
User Friendly, 7/15/1998
