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From: John Stoffel on 5 Nov 2009 06:40

Hi all,

I'm running 2.6.31 on a dual PIII Xeon 550Mhz box running Debian
unstable, very much upto date. I've got two IDE disks, two SATA
disks, two SCSI boot disks, two DLT7k tape drives and a tape library.
All on seperate controllers.

I'm trying to erase a DLT7000 tape, but I can't interrupt the 'mt -f
/dev/dlt7k-right erase' command. I see in dmesg the following:

[1464778.472497] INFO: task mt:14828 blocked for more than 120
seconds.
[1464778.472599] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[1464778.472700] mt D 00000001 0 14828 14392
0x00000000
[1464778.472843] f3871d20 00000086 f706fc58 00000001 f29804d0
f3871cb8 c12f9d78 f449b000
[1464778.473197] 78895eac 00053309 f695ef00 f69baea0 00000020
f69b91c0 c175f864 f2863d08
[1464778.473563] f35c44d0 f35c474c c281a740 00000000 f3871cd8
788ac870 00053309 00000000
[1464778.473910] Call Trace:
[1464778.473989] [<c12f9d78>] ? sym_put_start_queue+0xc8/0x120
[1464778.474062] [<c12fa419>] ? sym_queue_scsiio+0x179/0x270
[1464778.474134] [<c14bf535>] schedule_timeout+0x175/0x1b0
[1464778.474217] [<c121fff0>] ? kobject_put+0x20/0x50
[1464778.474288] [<c120e047>] ? blk_peek_request+0x107/0x180
[1464778.474368] [<c1214f2c>] ? blk_add_timer+0x6c/0xc0
[1464778.474452] [<c12bc0ff>] ? put_device+0xf/0x20
[1464778.474529] [<c12d88f2>] ? scsi_request_fn+0xc2/0x500
[1464778.474614] [<c14bf2bd>] wait_for_common+0xed/0x110
[1464778.474690] [<c102fa30>] ? default_wake_function+0x0/0x10
[1464778.474759] [<c14bf372>] wait_for_completion+0x12/0x20
[1464778.474830] [<c12ffbb0>] st_do_scsi+0x230/0x350
[1464778.474897] [<c12ff3e0>] ? st_scsi_execute_end+0x0/0x50
[1464778.474967] [<c13006db>] st_int_ioctl+0x1eb/0xd10
[1464778.475041] [<c1302a8a>] st_ioctl+0x6ea/0x1290
[1464778.475126] [<c10a332d>] ? chrdev_open+0xcd/0x160
[1464778.475224] [<c10793c5>] ? filemap_fault+0xd5/0x3a0
[1464778.475307] [<c10a3260>] ? chrdev_open+0x0/0x160
[1464778.475408] [<c1078de8>] ? unlock_page+0x48/0x50
[1464778.475511] [<c108c280>] ? __do_fault+0x2f0/0x3d0
[1464778.475598] [<c13023a0>] ? st_ioctl+0x0/0x1290
[1464778.475684] [<c10ad358>] vfs_ioctl+0x28/0x80
[1464778.475769] [<c10ad4ea>] do_vfs_ioctl+0x6a/0x5c0
[1464778.475857] [<c108db4d>] ? handle_mm_fault+0xed/0x540
[1464778.475946] [<c10ada79>] sys_ioctl+0x39/0x70
[1464778.476032] [<c1002e28>] sysenter_do_call+0x12/0x26


Is there anyway I can kill this process? Or see if it's actually
making any progress? The library doesn't happen to have a window, so
it's hard to see the drive lights without opening it up.

Thanks,
John
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Prev: blkio: Some CFQ debugging Aid
Next: [Patch 2/3] staging: rt2860: remove superfluous newlines