Hi Jens, I'm not very sure about this bisect, but anyway it'd be good to inform you of a possible problem on commit commit 3a02db083a78c9f3c9b69305ab513f9422d91b08 Author: Jens Axboe Date: Fri May 24 20:22:33 2013 +0200 virtio_blk: blk-mq support Pretend we have 4 issue queues. Signed-off-by: Jens Axboe =================================================== PARENT COMMIT NOT CLEAN. LOOK OUT FOR WRONG BISECT! =================================================== +------------------------------------------------------------------------------------+--------------+--------------+ | | 4202782cd8b5 | 25d8333ad6fc | +------------------------------------------------------------------------------------+--------------+--------------+ | good_boots | 1217 | 16 | | has_kernel_error_warning | 4664 | 3 | | BUG:kernel_test_hang | 4422 | 1 | | INFO:task_blocked_for_more_than_seconds | 118 | | | Kernel_panic-not_syncing:hung_task:blocked_tasks | 15 | | | BUG:kernel_test_crashed | 90 | | | Out_of_memory:Kill_process | 30 | | | INFO:rcu_sched_detected_stalls_on_CPUs/tasks:(detected_by,t=jiffies,g=,c=,q=) | 15 | | | INFO:rcu_sched_self-detected_stall_on_CPU(t=jiffies_g=c=q=) | 7 | | | INFO:NMI_handler(arch_trigger_all_cpu_backtrace_handler)took_too_long_to_run:msecs | 7 | | | BUG:kernel_early_hang_without_any_printk_output | 1 | | | page_allocation_failure:order:,mode | 2 | | | Kernel_panic-not_syncing:Out_of_memory_and_no_killable_processes | 3 | | | WARNING:CPU:PID:at_fs/sysfs/dir.c:sysfs_add_one() | 0 | 2 | | WARNING:CPU:PID:at_lib/kobject.c:kobject_add_internal() | 0 | 2 | | BUG:unable_to_handle_kernel_paging_request_at | 0 | 2 | | Oops:SMP | 0 | 2 | | Kernel_panic-not_syncing:Attempted_to_kill_init_exitcode= | 0 | 2 | +------------------------------------------------------------------------------------+--------------+--------------+ [ 15.050931] CPU 0 -> Queue 0 [ 15.136602] vda: unknown partition table [ 15.159290] ------------[ cut here ]------------ [ 15.161305] WARNING: CPU: 0 PID: 1 at fs/sysfs/dir.c:526 sysfs_add_one+0x96/0xaa() [ 15.162861] sysfs: cannot create duplicate filename '/devices/pci0000:00/0000:00:05.0/virtio1/block/vda/mq/0/cpu0' [ 15.165033] Modules linked in: [ 15.166415] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.12.0-rc5-02277-g25d8333 #1204 [ 15.167578] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 15.169442] 0000000000000000 ffff88001df55a10 ffffffff81a365f2 ffff88001df55a58 [ 15.171109] ffff88001df55a48 ffffffff810c5385 ffffffff81226e92 ffff88001b570000 [ 15.173115] ffff88001b59e6e0 00000000ffffffef ffff88001df55af0 ffff88001df55aa8 [ 15.174741] Call Trace: [ 15.175550] [] dump_stack+0x54/0x74 [ 15.176965] [] warn_slowpath_common+0x7f/0x98 [ 15.177852] [] ? sysfs_add_one+0x96/0xaa [ 15.178689] [] warn_slowpath_fmt+0x4c/0x4e [ 15.179559] [] sysfs_add_one+0x96/0xaa [ 15.180860] [] create_dir+0x70/0xb2 [ 15.181677] [] sysfs_create_dir+0x9a/0xb5 [ 15.182542] [] kobject_add_internal+0x11a/0x20e [ 15.183445] [] kobject_add+0x93/0xa5 [ 15.184741] [] blk_mq_register_disk+0x139/0x18a [ 15.185668] [] blk_register_queue+0xc4/0x116 [ 15.186535] [] add_disk+0x340/0x459 [ 15.187444] [] virtblk_probe+0x4e2/0x5cc [ 15.188947] [] virtio_dev_probe+0xbc/0xfa [ 15.189799] [] driver_probe_device+0x11a/0x2f2 [ 15.190708] [] __driver_attach+0x61/0x83 [ 15.191575] [] ? __device_attach+0x3d/0x3d [ 15.193032] [] bus_for_each_dev+0x80/0x8a [ 15.194164] [] driver_attach+0x1e/0x20 [ 15.195067] [] bus_add_driver+0x131/0x265 [ 15.196206] [] driver_register+0x8e/0xca [ 15.197532] [] register_virtio_driver+0x2b/0x2d [ 15.198452] [] init+0x53/0x85 [ 15.199181] [] ? max_loop_setup+0x1a/0x1a [ 15.200569] [] do_one_initcall+0xa4/0x138 [ 15.201443] [] ? parse_args+0x261/0x33f [ 15.202293] [] kernel_init_freeable+0x159/0x1df [ 15.203207] [] ? do_early_param+0x88/0x88 [ 15.204529] [] ? rest_init+0xdb/0xdb [ 15.205354] [] kernel_init+0xe/0xdb [ 15.206168] [] ret_from_fork+0x7c/0xb0 [ 15.207012] [] ? rest_init+0xdb/0xdb [ 15.208746] ---[ end trace ab3e0b29cef4bda3 ]--- [ 15.209877] ------------[ cut here ]------------ git bisect start 25d8333ad6fc71906caff0e3632231845ff585d2 61e6cfa80de5760bbe406f4e815b7739205754d2 -- git bisect bad 8c03e988073040ad2fc7906c18943873d7515d26 # 14:08 0- 15 Merge 'tip/core/rcu' into devel-hourly-2013101822 git bisect good b343ca84b4e3ba65508503333c923a797801a588 # 05:06 620+ 486 Revert "veth: Showing peer of veth type dev in ip link (kernel side)" git bisect good e8e4e1aaf8cdacc93fc782670ed126c65b9408b8 # 10:04 620+ 461 i40e: Bump version git bisect bad b309c3f4b6d197842fbb7d7486755e1fec5323ea # 10:04 0- 10 Merge 'block/new-queue' into devel-hourly-2013101822 git bisect good 4fd0376356ed2e1f6c2a4e8628782aedf903292e # 15:58 620+ 465 Merge branch 'renesas/boards2' into next/boards git bisect good 33436bc028fe1a7f21a80e067321347e62a6ae6c # 05:00 620+ 550 Merge 'mac80211-next/master' into devel-hourly-2013101822 git bisect bad a96c2b583a957d84a26183ca5c763970940ed1b4 # 05:21 569- 630 blk-mq: Do not allocate more cache entries than used git bisect bad 0ce4ee67bbd3296e5fce7c04cf13f80d2aa1b570 # 05:39 1- 9 blk-mq: cpu hot plug/unplug fixes git bisect good 779df82640101971b7a6ea5d063e9bb24f8c1fcf # 09:58 1032+ 862 null_blk: multi queue aware block test driver git bisect bad 3a02db083a78c9f3c9b69305ab513f9422d91b08 # 11:41 15- 8 virtio_blk: blk-mq support git bisect good 4202782cd8b52b3e84a6a9937603334f26e43c37 # 09:06 1000+ 793 mtip32xx: basic mq support git bisect good 4202782cd8b52b3e84a6a9937603334f26e43c37 # 12:34 3000+ 3095 mtip32xx: basic mq support git bisect bad 25d8333ad6fc71906caff0e3632231845ff585d2 # 12:34 0- 3 Merge 'arm-soc/fixes-non-critical' into devel-hourly-2013101822 git bisect good 12aee278b50c4a94a93fa0b4d201ae35d792c696 # 09:03 3000+ 4956 Merge branch 'akpm' (fixes from Andrew Morton) Thanks, Fengguang