On 02/01/2013 03:54 PM, Bart Van Assche wrote: > On 02/01/13 07:13, Tao Ma wrote: >> In our product system, we have several sata disks attached to one >> machine. So when one of the disk fails, the jbd2(yes, we use ext4) will >> hang forever and we will get something in /var/log/messages like below. >> It seems to me that the io sent to the scsi layer is never returned back >> with -EIO which is a little bit surprised for me(It should be a timeout >> somewhere, right?). We have tried echo "offline" > >> /sys/block/sdl/device/state, but it doesn't work. So is there any way >> for us to let the scsi device returns all the io requests back with EIO >> so that all the end_io can be called accordingly? Am I missing something >> here? > > Please note that I'm not familiar with SAS. But I found this in > drivers/scsi/scsi_proc.c: > > * proc_scsi_write - handle writes to /proc/scsi/scsi > * @file: not used > * @buf: buffer to write > * @length: length of buf, at most PAGE_SIZE > * @ppos: not used > * > * Description: this provides a legacy mechanism to add or remove > * devices by Host, Channel, ID, and Lun. To use, > * "echo 'scsi add-single-device 0 1 2 3' > /proc/scsi/scsi" or > * "echo 'scsi remove-single-device 0 1 2 3' > /proc/scsi/scsi" with > * "0 1 2 3" replaced by the Host, Channel, Id, and Lun. Sorry, it doesn't work since it will also send some IOs to the scsi. And it hangs... bash D 0000000000000000 0 57479 57477 0x00000000 ffff8817fee2dba0 0000000000000086 0000000000000000 0000000000000002 ffffffff817c4ed5 0000000000015f40 ffff88180c7e45f8 ffff88180c7e4040 ffffffff81a2d020 ffff88180c7e45f8 000000010fa4af09 0000000000000004 Call Trace: [<ffffffff8123eecf>] ? string+0x3f/0xd0 [<ffffffff8123fdc2>] ? vsnprintf+0x242/0x580 [<ffffffff811a0b14>] ? fsnotify_clear_marks_by_inode+0x34/0xf0 [<ffffffff811d33c0>] ? sysfs_delete_inode+0x0/0x60 [<ffffffff814aa5c5>] rwsem_down_failed_common+0x95/0x1c0 [<ffffffff814aa746>] rwsem_down_read_failed+0x26/0x30 [<ffffffff81241814>] call_rwsem_down_read_failed+0x14/0x30 [<ffffffff812385a0>] ? kobject_release+0x0/0x1f0 [<ffffffff814a9cd4>] ? down_read+0x24/0x30 [<ffffffff81167794>] get_super+0x74/0xc0 [<ffffffff8119aa9e>] fsync_bdev+0x1e/0x60 [<ffffffff812253ce>] invalidate_partition+0x2e/0x60 [<ffffffff811d0bfe>] del_gendisk+0x3e/0x130 [<ffffffff813070da>] ? device_del+0x16a/0x1a0 [<ffffffff8132f437>] sd_remove+0x67/0xb0 [<ffffffff8130adcf>] __device_release_driver+0x6f/0xe0 [<ffffffff8130ae6d>] device_release_driver+0x2d/0x40 [<ffffffff8130a723>] bus_remove_device+0x83/0xe0 [<ffffffff8130709f>] device_del+0x12f/0x1a0 [<ffffffff8132a7f5>] __scsi_remove_device+0xa5/0xb0 [<ffffffff8132a830>] scsi_remove_device+0x30/0x50 [<ffffffff8132cc3f>] proc_scsi_write+0x23f/0x280 [<ffffffff81182869>] ? mntput_no_expire+0x39/0xd0 [<ffffffff811c482f>] proc_reg_write+0x7f/0xc0 [<ffffffff81165c6c>] vfs_write+0xcc/0x1a0 [<ffffffff81165e25>] sys_write+0x55/0x90 [<ffffffff8100b032>] system_call_fastpath+0x16/0x1b Thanks, Tao > > Bart. > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
