Hi, This is a trivially reproducible (in my setup at least) WARN_ON that triggers whenever I run smartctl on a SATA disk connected via an aic94xx controller (Adaptec AIC-9410W SAS (Razor ASIC RAID)=20 (rev 09)). The kernel is (as far as device drivers are concerned) vanilla 2.6.27.12. Other than the warning and the fact that smartctl requires '-T permissive' to show the disk status, I can't see any negative effects. (please keep cc'd) Best regards, Grzegorz Nosek *** smartctl -a /dev/sdb (without -T permissive) *** smartctl version 5.37 [i686-pc-linux-gnu] Copyright (C) 2002-6 Bruce Allen Home page is http://smartmontools.sourceforge.net/ === START OF INFORMATION SECTION === Device Model: ST3500630NS Serial Number: 9QG93FV5 Firmware Version: 3.AEK User Capacity: 500,107,862,016 bytes Device is: Not in smartctl database [for details use: -P showall] ATA Version is: 7 ATA Standard is: Exact ATA specification draft version not indicated Local Time is: Fri Jan 23 20:17:30 2009 CET SMART support is: Available - device has SMART capability. SMART support is: Enabled Error SMART Status command failed Please get assistance from http://smartmontools.sourceforge.net/ Values from ATA status return descriptor are: 00 09 0c 00 00 00 00 00 00 00 00 00 00 00 00 A mandatory SMART command failed: exiting. To continue, add one or more '-T permissive' options. *** the code in question *** void ata_qc_issue(struct ata_queued_cmd *qc) { struct ata_port *ap = qc->ap; struct ata_link *link = qc->dev->link; u8 prot = qc->tf.protocol; /* Make sure only one non-NCQ command is outstanding. The * check is skipped for old EH because it reuses active qc to * request ATAPI sense. */ WARN_ON(ap->ops->error_handler && ata_tag_valid(link->active_tag)); if (ata_is_ncq(prot)) { WARN_ON(link->sactive & (1 << qc->tag)); if (!link->sactive) ap->nr_active_links++; link->sactive |= 1 << qc->tag; } else { WARN_ON(link->sactive); /* <-- this is line 4867 */ ap->nr_active_links++; link->active_tag = qc->tag; } *** and the warning itself *** [251374.059375] ------------[ cut here ]------------ [251374.064287] WARNING: at drivers/ata/libata-core.c:4867 ata_qc_issue+0xe1/0x2ba() [251374.067805] Modules linked in: drbd i2c_i801 xt_owner ipt_account ipt_MASQUERADE xt_multiport ipt_REJECT xt_comment xt_state xt_hashlimit iptable_mangle iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack iptable_filter ip_t ables tg3 libphy psmouse e1000e [251374.067805] Pid: 9450, comm: smartctl Tainted: G W 2.6.27.12 #12 [251374.067805] [251374.067805] Call Trace: [251374.067805] [<ffffffff81031103>] warn_on_slowpath+0x58/0x7f [251374.067805] [<ffffffff8107c8d0>] ? mempool_alloc_slab+0x11/0x13 [251374.067805] [<ffffffff8107c9da>] ? mempool_alloc+0x48/0xf9 [251374.067805] [<ffffffff81247015>] ? scsi_sg_alloc+0x43/0x45 [251374.067805] [<ffffffff811bb301>] ? __sg_alloc_table+0x78/0xfa [251374.067805] [<ffffffff81272adc>] ata_qc_issue+0xe1/0x2ba [251374.067805] [<ffffffff812423fd>] ? scsi_done+0x0/0x21 [251374.067805] [<ffffffff8127a015>] ? ata_scsi_pass_thru+0x0/0x24b [251374.067805] [<ffffffff8127756a>] ata_scsi_translate+0x11f/0x155 [251374.067805] [<ffffffff812423fd>] ? scsi_done+0x0/0x21 [251374.067805] [<ffffffff812780fc>] ata_sas_queuecmd+0x186/0x1a5 [251374.067805] [<ffffffff812575f1>] sas_queuecommand+0x82/0x27b [251374.067805] [<ffffffff81242b66>] scsi_dispatch_cmd+0x196/0x1ea [251374.067805] [<ffffffff812482be>] scsi_request_fn+0x28a/0x35f [251374.067805] [<ffffffff811a4776>] elv_insert+0x7f/0x18e [251374.067805] [<ffffffff811a4915>] __elv_add_request+0x90/0x98 [251374.067805] [<ffffffff811a8d0f>] blk_execute_rq_nowait+0x65/0x8e [251374.067805] [<ffffffff811a8dd8>] blk_execute_rq+0xa0/0xcc [251374.067805] [<ffffffff811a5076>] ? blk_rq_bio_prep+0x3a/0x108 [251374.067805] [<ffffffff811a8962>] ? blk_rq_append_bio+0x19/0x49 [251374.067805] [<ffffffff811a8aa6>] ? blk_rq_map_user+0x114/0x1bb [251374.067805] [<ffffffff811abbb6>] sg_io+0x263/0x373 [251374.067805] [<ffffffff811ac326>] scsi_cmd_ioctl+0x1d3/0x3a9 [251374.067805] [<ffffffff810482b5>] ? sched_clock_cpu+0x134/0x140 [251374.067805] [<ffffffff81026edb>] ? task_rq_lock+0x40/0x79 [251374.067805] [<ffffffff8126a5b9>] sd_ioctl+0x7c/0xa1 [251374.067805] [<ffffffff811a9cbf>] blkdev_driver_ioctl+0x63/0x78 [251374.067805] [<ffffffff811aa3a5>] blkdev_ioctl+0x6d1/0x6fc [251374.067805] [<ffffffff8120062c>] ? n_tty_receive_buf+0xe1a/0xe5a [251374.067805] [<ffffffff810821c7>] ? mark_page_accessed+0x20/0x34 [251374.067805] [<ffffffff8107c696>] ? filemap_fault+0x1c9/0x32b [251374.067805] [<ffffffff810c9a08>] block_ioctl+0x1b/0x1f [251374.067805] [<ffffffff810af72e>] vfs_ioctl+0x2a/0x77 [251374.067805] [<ffffffff810af9b0>] do_vfs_ioctl+0x235/0x246 [251374.067805] [<ffffffff810afa03>] sys_ioctl+0x42/0x67 [251374.067805] [<ffffffff81026e8e>] ? __wake_up+0x43/0x50 [251374.067805] [<ffffffff810d4edb>] sg_ioctl_trans+0x1e0/0x248 [251374.067805] [<ffffffff810d3929>] compat_sys_ioctl+0x2d2/0x316 [251374.067805] [<ffffffff810a313f>] ? vfs_write+0x122/0x157 [251374.067805] [<ffffffff81023326>] sysenter_dispatch+0x7/0x27 [251374.067805] [251374.067805] ---[ end trace 5c5fec5d7ca0c598 ]--- -- 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
