This is a regression somewhere between 3.15 and 3.19.3. Let me know if more diagnostics would be helpful. [58635.050733] BUG: using smp_processor_id() in preemptible [00000000] code: apt-check/13293 [58635.059861] caller is debug_smp_processor_id+0x17/0x20 [58635.059863] CPU: 0 PID: 13293 Comm: apt-check Not tainted 3.19.3-ama+ #44 [58635.059864] Hardware name: Dell Inc. PowerEdge R620/0KCKR5, BIOS 1.2.6 05/10/2012 [58635.059865] ffffffff81810777 ffff88041bbbb898 ffffffff815d6ae5 0000000000000002 [58635.059867] 0000000000000000 ffff88041bbbb8c8 ffffffff81307945 0000000000005000 [58635.059869] ffff880035745e00 0000000000000000 ffff88040dc67780 ffff88041bbbb8d8 [58635.059871] Call Trace: [58635.059874] [<ffffffff815d6ae5>] dump_stack+0x4f/0x7b [58635.059877] [<ffffffff81307945>] check_preemption_disabled+0xe5/0x100 [58635.059879] [<ffffffff81307977>] debug_smp_processor_id+0x17/0x20 [58635.059884] [<ffffffffa003d079>] megasas_build_ldio_fusion+0x259/0x450 [megaraid_sas] [58635.059887] [<ffffffffa003d312>] megasas_build_io_fusion+0xa2/0x590 [megaraid_sas] [58635.059890] [<ffffffff815de2e2>] ? _raw_spin_unlock_irqrestore+0x22/0x40 [58635.059893] [<ffffffffa003d8b6>] megasas_build_and_issue_cmd_fusion+0x66/0x$00 [megaraid_sas] [58635.059896] [<ffffffffa00310dc>] megasas_queue_command+0x12c/0x170 [megarai$_sas] [58635.059898] [<ffffffff8141d45b>] ? scsi_prep_fn+0xdb/0x180 [58635.059901] [<ffffffff8141c2ae>] scsi_dispatch_cmd+0xee/0x340 [58635.059902] [<ffffffff8141f019>] scsi_request_fn+0x4b9/0x6c0 [58635.059904] [<ffffffff815de215>] ? _raw_spin_lock_irqsave+0x25/0x30 [58635.059906] [<ffffffff812c9077>] __blk_run_queue+0x37/0x50 [58635.059908] [<ffffffff812ec639>] cfq_insert_request+0x2a9/0x600 [58635.059910] [<ffffffff812c618c>] __elv_add_request+0x1bc/0x300 [58635.059912] [<ffffffff812ccd28>] blk_flush_plug_list+0x1b8/0x210 [58635.059914] [<ffffffff812cd118>] blk_finish_plug+0x18/0x50 [58635.059916] [<ffffffff81154543>] __do_page_cache_readahead+0x1d3/0x250 [58635.059919] [<ffffffff81154708>] ondemand_readahead+0x148/0x2a0 [58635.059921] [<ffffffff8114880c>] ? pagecache_get_page+0x2c/0x1d0 [58635.059923] [<ffffffff811549e1>] page_cache_sync_readahead+0x31/0x50 [58635.059924] [<ffffffff81149bf9>] generic_file_read_iter+0x449/0x630 [58635.059926] [<ffffffff811acede>] new_sync_read+0x7e/0xb0 [58635.059928] [<ffffffff811ae0c8>] __vfs_read+0x18/0x50 [58635.059930] [<ffffffff811ae186>] vfs_read+0x86/0x140 [58635.059932] [<ffffffff811ae289>] SyS_read+0x49/0xb0 [58635.059933] [<ffffffff81045dac>] ? do_page_fault+0xc/0x10 [58635.059935] [<ffffffff815dea72>] system_call_fastpath+0x12/0x17 Thanks, Andy -- 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
