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Date: Mon, 23 May 2016 17:58:18 +0800
From: kernel test robot <xiaolong.ye@...el.com>
To: Shaohua Li <shli@...com>
Cc: lkp@...org, LKML <linux-kernel@...r.kernel.org>,
0day robot <fengguang.wu@...el.com>
Subject: [block] e0d3dd5854: INFO: suspicious RCU usage. ]
FYI, we noticed the following commit:
https://github.com/0day-ci/linux Shaohua-Li/block-throttle-prepare-support-multiple-limits/20160511-082233
commit e0d3dd5854af35d080411e2c51308f58f72ed18b ("block-throttle: add .low interface")
on test machine: vm-kbuild-1G: 2 threads qemu-system-x86_64 -enable-kvm -cpu Haswell,+smep,+smap with 1G memory
caused below changes:
+------------------------------+------------+------------+
| | dd11b46868 | e0d3dd5854 |
+------------------------------+------------+------------+
| boot_successes | 4 | 0 |
| boot_failures | 0 | 3 |
| INFO:suspicious_RCU_usage | 0 | 3 |
| backtrace:async_run_entry_fn | 0 | 3 |
+------------------------------+------------+------------+
[ 10.334955] scsi host0: Virtio SCSI HBA
[ 10.344798]
[ 10.345419] ===============================
[ 10.346304] [ INFO: suspicious RCU usage. ]
[ 10.347214] 4.6.0-rc3-00122-ge0d3dd5 #2 Not tainted
[ 10.348196] -------------------------------
[ 10.349134] kernel/cgroup.c:4037 cgroup_mutex or RCU read lock required!
[ 10.350853]
[ 10.350853] other info that might help us debug this:
[ 10.350853]
[ 10.352921]
[ 10.352921] rcu_scheduler_active = 1, debug_locks = 0
[ 10.354431] 5 locks held by kworker/u4:3/110:
[ 10.355327] #0: ("events_unbound"){.+.+.+}, at: [<ffffffff810b86a5>] process_one_work+0x18d/0x63b
[ 10.357444] #1: ((&entry->work)
[ 10.357887] tun: Universal TUN/TAP device driver, 1.6
[ 10.357887] tun: (C) 1999-2004 Max Krasnyansky <maxk@...lcomm.com>
[ 10.360437] ){+.+.+.}, at: [<ffffffff810b86a5>] process_one_work+0x18d/0x63b
[ 10.362235] #2: (&shost->scan_mutex){+.+.+.}, at: [<ffffffff81773c0f>] scsi_scan_host_selected+0x7c/0x104
[ 10.364398] #3: (&(&q->__queue_lock)->rlock){..-...}, at: [<ffffffff81541545>] blkcg_exit_queue+0x19/0x38
[ 10.366652] #4: (&(&blkcg->lock)->rlock){......}, at: [<ffffffff81540702>] blkg_destroy_all+0x78/0xb4
[ 10.368788]
[ 10.368788] stack backtrace:
[ 10.370073] CPU: 0 PID: 110 Comm: kworker/u4:3 Not tainted 4.6.0-rc3-00122-ge0d3dd5 #2
[ 10.371731] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[ 10.373494] Workqueue: events_unbound async_run_entry_fn
[ 10.374583] 0000000000000000 ffff880035d67578 ffffffff8154f4de ffff880035d52ac0
[ 10.376444] 0000000000000001 ffff880035d675a8 ffffffff810e7088 0000000000000000
[ 10.378332] 0000000000000000 ffffffff836f0240 ffff88003e48ca90 ffff880035d675d0
[ 10.380214] Call Trace:
[ 10.380896] [<ffffffff8154f4de>] dump_stack+0x86/0xc0
[ 10.381873] [<ffffffff810e7088>] lockdep_rcu_suspicious+0xf7/0x100
[ 10.383006] [<ffffffff8113814a>] css_next_descendant_post+0x5e/0xb9
[ 10.384125] [<ffffffff81541767>] blk_throtl_update_valid_limit+0x30/0x133
[ 10.385276] [<ffffffff815418aa>] throtl_pd_offline+0x40/0x63
[ 10.386347] [<ffffffff81540463>] blkg_destroy+0xf6/0x31d
[ 10.387362] [<ffffffff810e527c>] ? noop_count+0xb/0xb
[ 10.388348] [<ffffffff811561cb>] ? is_ftrace_trampoline+0x4b/0x71
[ 10.389446] [<ffffffff810bd26b>] ? __kernel_text_address+0x37/0x55
[ 10.390556] [<ffffffff81064784>] ? print_context_stack+0x6f/0xde
[ 10.391635] [<ffffffff810e527c>] ? noop_count+0xb/0xb
[ 10.392615] [<ffffffff810e8073>] ? check_usage+0xda/0x5bc
[ 10.393695] [<ffffffff810e6761>] ? add_lock_to_list+0x84/0x8b
[ 10.395323] [<ffffffff810ea813>] ? __lock_acquire+0x16ef/0x191e
[ 10.396434] [<ffffffff810e85de>] ? check_irq_usage+0x89/0x9a
[ 10.397489] [<ffffffff810e85de>] ? check_irq_usage+0x89/0x9a
[ 10.398539] [<ffffffff810ea327>] ? __lock_acquire+0x1203/0x191e
[ 10.399617] [<ffffffff810eb287>] ? lock_acquire+0x188/0x223
[ 10.400663] [<ffffffff81540702>] ? blkg_destroy_all+0x78/0xb4
[ 10.401719] [<ffffffff8154070d>] blkg_destroy_all+0x83/0xb4
[ 10.402759] [<ffffffff8154154d>] blkcg_exit_queue+0x21/0x38
[ 10.403798] [<ffffffff81529caf>] blk_release_queue+0x2b/0xd7
[ 10.404847] [<ffffffff8155160f>] kobject_put+0x81/0x95
[ 10.405840] [<ffffffff815235f2>] blk_put_queue+0x15/0x17
[ 10.406852] [<ffffffff81774ada>] scsi_device_dev_release_usercontext+0xbf/0x10f
[ 10.408484] [<ffffffff81774a1b>] ? scsi_device_dev_release+0x1e/0x1e
[ 10.409598] [<ffffffff810b8bb1>] execute_in_process_context+0x2b/0x87
[ 10.410734] [<ffffffff81774a19>] scsi_device_dev_release+0x1c/0x1e
[ 10.411832] [<ffffffff817268f4>] device_release+0x59/0x8e
[ 10.412851] [<ffffffff8155160f>] kobject_put+0x81/0x95
[ 10.413839] [<ffffffff81726c5c>] put_device+0x17/0x19
[ 10.414826] [<ffffffff817758cf>] __scsi_remove_device+0xcb/0xd0
[ 10.415895] [<ffffffff81772bf7>] scsi_probe_and_add_lun+0x2f0/0x936
[ 10.417031] [<ffffffff81773890>] __scsi_scan_target+0xaa/0x1cf
[ 10.418088] [<ffffffff81773ae6>] scsi_scan_channel+0x65/0x7f
[ 10.419134] [<ffffffff81773c62>] scsi_scan_host_selected+0xcf/0x104
[ 10.420245] [<ffffffff81773d07>] do_scsi_scan_host+0x70/0x75
[ 10.421293] [<ffffffff81773eca>] do_scan_async+0x1c/0x15c
[ 10.422316] [<ffffffff810c1308>] async_run_entry_fn+0x39/0xc3
[ 10.423375] [<ffffffff810b8813>] process_one_work+0x2fb/0x63b
[ 10.424439] [<ffffffff810b96d9>] worker_thread+0x24f/0x384
[ 10.425464] [<ffffffff810b948a>] ? rescuer_thread+0x2ba/0x2ba
[ 10.426520] [<ffffffff810be619>] kthread+0xfb/0x103
[ 10.427483] [<ffffffff81cb5272>] ret_from_fork+0x22/0x50
[ 10.428524] [<ffffffff810be51e>] ? kthread_create_on_node+0x1ca/0x1ca
[ 10.430483] Atheros(R) L2 Ethernet Driver - version 2.2.3
[ 10.431413] scsi 0:0:1:0: Direct-Access QEMU QEMU HARDDISK 2.4. PQ: 0 ANSI: 5
[ 10.433419] Copyright (c) 2007 Atheros Corporation.
FYI, raw QEMU command line is:
qemu-system-x86_64 -enable-kvm -cpu Haswell,+smep,+smap -kernel /pkg/linux/x86_64-nfsroot/gcc-6/e0d3dd5854af35d080411e2c51308f58f72ed18b/vmlinuz-4.6.0-rc3-00122-ge0d3dd5 -append 'root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-kbuild-1G-8/bisect_boot-1-debian-x86_64-2015-02-07.cgz-x86_64-nfsroot-e0d3dd5854af35d080411e2c51308f58f72ed18b-20160523-89777-1kpfl6n-0.yaml ARCH=x86_64 kconfig=x86_64-nfsroot branch=linux-devel/devel-hourly-2016051922 commit=e0d3dd5854af35d080411e2c51308f58f72ed18b BOOT_IMAGE=/pkg/linux/x86_64-nfsroot/gcc-6/e0d3dd5854af35d080411e2c51308f58f72ed18b/vmlinuz-4.6.0-rc3-00122-ge0d3dd5 max_uptime=600 RESULT_ROOT=/result/boot/1/vm-kbuild-1G/debian-x86_64-2015-02-07.cgz/x86_64-nfsroot/gcc-6/e0d3dd5854af35d080411e2c51308f58f72ed18b/0 LKP_SERVER=inn earlyprintk=ttyS0,115200 systemd.log_level=err debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 console=ttyS0,115200 console=tty0 vga=normal rw ip=::::vm-kbuild-1G-8::dhcp' -initrd /fs/sdc1/initrd-vm-kbuild-1G-8 -m 1024 -smp 2 -device e1000,netdev=net0 -netdev user,id=net0,hostfwd=tcp::23007-:22 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -device virtio-scsi-pci,id=scsi0 -drive file=/fs/sdc1/disk0-vm-kbuild-1G-8,if=none,id=hd0,media=disk,aio=native,cache=none -device scsi-hd,bus=scsi0.0,drive=hd0,scsi-id=1,lun=0 -drive file=/fs/sdc1/disk1-vm-kbuild-1G-8,if=none,id=hd1,media=disk,aio=native,cache=none -device scsi-hd,bus=scsi0.0,drive=hd1,scsi-id=1,lun=1 -drive file=/fs/sdc1/disk2-vm-kbuild-1G-8,if=none,id=hd2,media=disk,aio=native,cache=none -device scsi-hd,bus=scsi0.0,drive=hd2,scsi-id=1,lun=2 -drive file=/fs/sdc1/disk3-vm-kbuild-1G-8,if=none,id=hd3,media=disk,aio=native,cache=none -device scsi-hd,bus=scsi0.0,drive=hd3,scsi-id=1,lun=3 -drive file=/fs/sdc1/disk4-vm-kbuild-1G-8,if=none,id=hd4,media=disk,aio=native,cache=none -device scsi-hd,bus=scsi0.0,drive=hd4,scsi-id=1,lun=4 -pidfile /dev/shm/kboot/pid-vm-kbuild-1G-8 -serial file:/dev/shm/kboot/serial-vm-kbuild-1G-8 -daemonize -display none -monitor null
Thanks,
Kernel Test Robot
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