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Date: Sat, 14 Jun 2014 00:04:07 +0800 From: Jet Chen <jet.chen@...el.com> To: Hong Zhiguo <zhiguohong@...cent.com> CC: Jens Axboe <axboe@...nel.dk>, Fengguang Wu <fengguang.wu@...el.com>, Yuanhan Liu <yuanhan.liu@...el.com>, lkp@...org, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: [block] WARNING: CPU: 0 PID: 99 at kernel/softirq.c:156 local_bh_enable() Hi Zhiguo, 0day kernel testing robot got the below dmesg and the first bad commit is git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master commit 2c575026fae6e63771bd2a4c1d407214a8096a89 Author: Hong Zhiguo <zhiguohong@...cent.com> AuthorDate: Wed Nov 20 10:35:05 2013 -0700 Commit: Jens Axboe <axboe@...nel.dk> CommitDate: Wed Nov 20 15:33:04 2013 -0700 Update of blkg_stat and blkg_rwstat may happen in bh context. While u64_stats_fetch_retry is only preempt_disable on 32bit UP system. This is not enough to avoid preemption by bh and may read strange 64 bit value. Signed-off-by: Hong Zhiguo <zhiguohong@...cent.com> Acked-by: Tejun Heo <tj@...nel.org> Cc: stable@...nel.org Signed-off-by: Jens Axboe <axboe@...nel.dk> +-------------------------------------------------------+------------+------------+ | | 82023bb7f7 | 2c575026fa | +-------------------------------------------------------+------------+------------+ | boot_successes | 794 | 183 | | boot_failures | 106 | 117 | | BUG:kernel_test_crashed | 33 | | | BUG:kernel_boot_hang | 73 | 91 | | WARNING:CPU:PID:at_kernel/softirq.c:local_bh_enable() | 0 | 117 | | inconsistent_SOFTIRQ-ON-W-IN-SOFTIRQ-W_usage | 0 | 117 | | backtrace:do_mount | 0 | 85 | | backtrace:SyS_mount | 0 | 85 | | backtrace:redo_fd_request | 0 | 117 | | backtrace:floppy_work_workfn | 0 | 0 | | backtrace:fd_timer_workfn | 0 | 0 | +-------------------------------------------------------+------------+------------+ [ 414.461526] power_supply test_battery: prop TEMP=26 [ 414.871358] power_supply test_battery: prop VOLTAGE_NOW=3300 [ 416.112247] ------------[ cut here ]------------ [ 416.113048] WARNING: CPU: 0 PID: 99 at kernel/softirq.c:156 local_bh_enable+0x39/0xc0() [ 416.113048] CPU: 0 PID: 99 Comm: kworker/u2:1 Not tainted 3.12.0-10276-g2c57502 #1 [ 416.113048] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 416.113048] Workqueue: floppy redo_fd_request [ 416.113048] 00000000 00000000 d1599c7c c13f3d3f d1599cac c023551b c1990f08 00000000 [ 416.113048] 00000063 c1991108 0000009c c0239219 c0239219 c060f801 d1661a14 d1660000 [ 416.113048] d1599cbc c02355dd 00000009 00000000 d1599cc8 c0239219 d1599cf0 d1599cd8 [ 416.113048] Call Trace: [ 416.113048] [<c13f3d3f>] dump_stack+0x16/0x18 [ 416.113048] [<c023551b>] warn_slowpath_common+0x6b/0x90 [ 416.113048] [<c0239219>] ? local_bh_enable+0x39/0xc0 [ 416.113048] [<c0239219>] ? local_bh_enable+0x39/0xc0 [ 416.113048] [<c060f801>] ? blkg_rwstat_read+0x41/0x50 [ 416.113048] [<c02355dd>] warn_slowpath_null+0x1d/0x20 [ 416.113048] [<c0239219>] local_bh_enable+0x39/0xc0 [ 416.113048] [<c060f801>] blkg_rwstat_read+0x41/0x50 [ 416.113048] [<c0611b65>] __cfq_set_active_queue+0x75/0x180 [ 416.113048] [<c0220ab3>] ? kvm_clock_read+0x13/0x20 [ 416.113048] [<c0207738>] ? sched_clock+0x8/0x10 [ 416.113048] [<c025b8b5>] ? sched_clock_local.constprop.2+0x15/0x150 [ 416.113048] [<c06132f3>] cfq_dispatch_requests+0x613/0x990 [ 416.113048] [<c0220ab3>] ? kvm_clock_read+0x13/0x20 [ 416.113048] [<c0207738>] ? sched_clock+0x8/0x10 [ 416.113048] [<c025b8b5>] ? sched_clock_local.constprop.2+0x15/0x150 [ 416.113048] [<c08bceff>] ? redo_fd_request+0x3f/0x1010 [ 416.113048] [<c05f7e1e>] blk_peek_request+0x17e/0x1b0 [ 416.113048] [<c140945d>] ? _raw_spin_lock_irq+0x6d/0x80 [ 416.113048] [<c05f7e59>] blk_fetch_request+0x9/0x20 [ 416.113048] [<c08bcf45>] redo_fd_request+0x85/0x1010 [ 416.113048] [<c024a1e0>] ? process_one_work+0x1c0/0x3d0 [ 416.113048] [<c024a24a>] process_one_work+0x22a/0x3d0 [ 416.113048] [<c024a1e0>] ? process_one_work+0x1c0/0x3d0 [ 416.113048] [<c024a5bf>] worker_thread+0x1cf/0x330 [ 416.113048] [<c024a3f0>] ? process_one_work+0x3d0/0x3d0 [ 416.113048] [<c025108a>] kthread+0xaa/0xb0 [ 416.113048] [<c140a637>] ret_from_kernel_thread+0x1b/0x28 [ 416.113048] [<c0250fe0>] ? __kthread_unpark+0x40/0x40 [ 416.113048] ---[ end trace 053edd2998e0f96b ]--- [ 438.998238] block nbd12: Attempted send on closed socket git bisect start v3.13 v3.12 -- git bisect good 3bad8bb5cd3048a67df43ac6b1e2f191f19d9ff0 # 12:35 300+ 46 Merge branch 'for-next' of git://git.samba.org/sfrench/cifs-2.6 git bisect bad dd0508093b79141e0044ca02f0acb6319f69f546 # 12:49 41- 1 Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip git bisect bad 3f02ff5c2c69753666787ed125708d283a823ffb # 13:07 93- 2 Merge tag 'tty-3.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty git bisect good 1ab231b274ba51a54acebec23c6aded0f3cdf54e # 13:31 300+ 30 Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip git bisect bad 5ee540613db504a10e15fafaf4c08cac96aa1823 # 13:50 66- 5 Merge branch 'for-linus' of git://git.kernel.dk/linux-block git bisect good 53c6de50262a8edd6932bb59a32db7b9d92f8d67 # 14:26 300+ 6 Merge branch 'x86/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip git bisect good 59fb2f0e9e30ad99a8bab0ff1efaf8f4a3b7105f # 14:50 300+ 57 Merge tag 'fbdev-fixes-3.13' of git://git.kernel.org/pub/scm/linux/kernel/git/tomba/linux git bisect good ef1e4e32d595d3e6c9a6d3d2956f087d5886c5e5 # 15:17 300+ 32 Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs git bisect good 29be6345bbaec8502a70c4e2204d5818b48c4e8f # 19:00 300+ 40 Merge tag 'nfs-for-3.13-3' of git://git.linux-nfs.org/projects/trondmy/linux-nfs git bisect bad e345d767f6530ec9cb0aabab7ea248072a9c6975 # 19:17 131- 8 Merge branch 'stable/for-jens-3.13-take-two' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip into for-linus git bisect bad c170bbb45febc03ac4d34ba2b8bb55e06104b7e7 # 19:33 15- 2 block: submit_bio_wait() conversions git bisect bad 2c575026fae6e63771bd2a4c1d407214a8096a89 # 19:57 41- 2 Update of blkg_stat and blkg_rwstat may happen in bh context. While u64_stats_fetch_retry is only preempt_disable on 32bit UP system. This is not enough to avoid preemption by bh and may read strange 64 bit value. # first bad commit: [2c575026fae6e63771bd2a4c1d407214a8096a89] Update of blkg_stat and blkg_rwstat may happen in bh context. While u64_stats_fetch_retry is only preempt_disable on 32bit UP system. This is not enough to avoid preemption by bh and may read strange 64 bit value. git bisect good 82023bb7f75b0052f40d3e74169d191c3e4e6286 # 20:59 900+ 106 Merge tag 'pm+acpi-2-3.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm git bisect bad b1cce620fd4b6864c92e7307be7839789f9c8be0 # 20:59 0- 5 Add linux-next specific files for 20140612 git bisect bad 6d87c225f5d82d29243dc124f1ffcbb0e14ec358 # 21:29 89- 6 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client git bisect bad f9801c532e045c1ab89801d0597353c5e2a55671 # 21:58 113- 8 Add linux-next specific files for 20140613 This script may reproduce the error. ----------------------------------------------------------------------------- #!/bin/bash kernel=$1 kvm=( qemu-system-x86_64 -cpu kvm64 -enable-kvm -kernel $kernel -smp 2 -m 256M -net nic,vlan=0,macaddr=00:00:00:00:00:00,model=virtio -net user,vlan=0 -net nic,vlan=1,model=e1000 -net user,vlan=1 -boot order=nc -no-reboot -watchdog i6300esb -serial stdio -display none -monitor null ) append=( debug sched_debug apic=debug ignore_loglevel sysrq_always_enabled panic=10 prompt_ramdisk=0 earlyprintk=ttyS0,115200 console=ttyS0,115200 console=tty0 vga=normal root=/dev/ram0 rw ) "${kvm[@]}" --append "${append[*]}" ----------------------------------------------------------------------------- Thanks, Jet View attachment "dmesg-yocto-ivb42-41:20140613200222:i386-randconfig-tt0-06131036:3.12.0-10276-g2c57502:1" of type "text/plain" (62011 bytes) View attachment "Attached Message Part" of type "text/plain" (86 bytes) View attachment "config-3.12.0-10276-g2c57502" of type "text/plain" (102823 bytes)
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