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Date: Wed, 18 Feb 2015 11:36:23 +0800
From: Fengguang Wu <fengguang.wu@...el.com>
To: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc: LKP <lkp@...org>, linux-kernel@...r.kernel.org
Subject: [rcu] [ 0.081483] [ INFO: suspicious RCU usage. ]
Greetings,
0day kernel testing robot got the below dmesg and the first bad commit is
git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/dev
commit 4da4e28818f5017c96f0fde72d643e965ac78253
Author: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
AuthorDate: Mon Feb 16 17:20:57 2015 -0800
Commit: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
CommitDate: Mon Feb 16 17:20:57 2015 -0800
Squash with 287f7a10372c (rcu: Process offlining and onlining only at grace-period start)
->oflmask and ->onlmask replaced by ->qsmaskinitnext
Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
+----------------------------------------------------------------+------------+------------+------------+
| | 414341d2c2 | 4da4e28818 | 4da4e28818 |
+----------------------------------------------------------------+------------+------------+------------+
| boot_successes | 60 | 0 | 0 |
| boot_failures | 0 | 12 | 12 |
| INFO:suspicious_RCU_usage | 0 | 12 | 12 |
| RCU_used_illegally_from_offline_CPU | 0 | 12 | 12 |
| WARNING:at_kernel/rcu/tree_plugin.h:#rcu_note_context_switch() | 0 | 12 | 12 |
| backtrace:kthread_create_on_node | 0 | 2 | 2 |
| backtrace:kernel_init_freeable | 0 | 3 | 3 |
| backtrace:build_sched_domains | 0 | 2 | 2 |
| backtrace:sched_init_smp | 0 | 2 | 2 |
| backtrace:do_fork | 0 | 10 | 10 |
| backtrace:kthreadd | 0 | 10 | 10 |
| backtrace:kill_pid_info | 0 | 7 | 7 |
| backtrace:SyS_kill | 0 | 7 | 7 |
| backtrace:populate_rootfs | 0 | 1 | 1 |
+----------------------------------------------------------------+------------+------------+------------+
[ 0.080336]
[ 0.080669] ===============================
[ 0.080669] ===============================
[ 0.081483] [ INFO: suspicious RCU usage. ]
[ 0.081483] [ INFO: suspicious RCU usage. ]
[ 0.082283] 3.19.0-rc1-00098-g4da4e28 #79 Not tainted
[ 0.082283] 3.19.0-rc1-00098-g4da4e28 #79 Not tainted
[ 0.083267] -------------------------------
[ 0.083267] -------------------------------
[ 0.084068] kernel/sched/fair.c:4737 suspicious rcu_dereference_check() usage!
[ 0.084068] kernel/sched/fair.c:4737 suspicious rcu_dereference_check() usage!
[ 0.085733]
[ 0.085733] other info that might help us debug this:
[ 0.085733]
[ 0.085733]
[ 0.085733] other info that might help us debug this:
[ 0.085733]
[ 0.087275]
[ 0.087275] RCU used illegally from offline CPU!
[ 0.087275] rcu_scheduler_active = 1, debug_locks = 0
[ 0.087275]
[ 0.087275] RCU used illegally from offline CPU!
[ 0.087275] rcu_scheduler_active = 1, debug_locks = 0
[ 0.089395] 2 locks held by swapper/0/1:
[ 0.089395] 2 locks held by swapper/0/1:
[ 0.090000] #0:
[ 0.090000] #0: ( (&p->pi_lock&p->pi_lock){-.....}){-.....}, at: , at: [<c105160e>] try_to_wake_up+0x20/0x278
[<c105160e>] try_to_wake_up+0x20/0x278
[ 0.090000] #1:
[ 0.090000] #1: ( (rcu_read_lockrcu_read_lock){......}){......}, at: , at: [<c105676c>] select_task_rq_fair+0x63/0x859
[<c105676c>] select_task_rq_fair+0x63/0x859
git bisect start 4da4e28818f5017c96f0fde72d643e965ac78253 97bf6af1f928216fd6c5a66e8a57bfa95a659672 --
git bisect good 6109b00d083775e7f884e0e6562c7cc502fb701b # 11:26 20+ 0 rcu: Improve diagnostics for blocked critical sections in irq
git bisect good 287f7a10372c77a6ae9bb5efaa51a48291bfaa35 # 11:28 20+ 0 rcu: Process offlining and onlining only at grace-period start
git bisect good c99d87408752d8d76d5af4ceb1a8d68cb36ab902 # 11:57 20+ 0 rcu: Reverse rcu_dereference_check() conditions
git bisect good 61d642e9d1b66a46626ba3a77ef39fdb3aa6fbf4 # 11:58 20+ 0 rcu: Remove unnecessary condition check in rcu_qsctr_help()
git bisect good 807079420046dd96282c0f755b13869d8dff35f8 # 12:00 20+ 0 rcu: Remove fastpath from __rcu_process_callbacks()
git bisect good 414341d2c2f7efa9564b45ccdd86ffd498b53c05 # 12:02 20+ 0 rcu: Add grace-period initialization check for proper ->qsmask values
# first bad commit: [4da4e28818f5017c96f0fde72d643e965ac78253] Squash with 287f7a10372c (rcu: Process offlining and onlining only at grace-period start)
git bisect good 414341d2c2f7efa9564b45ccdd86ffd498b53c05 # 12:05 60+ 0 rcu: Add grace-period initialization check for proper ->qsmask values
# extra tests with DEBUG_INFO
git bisect bad 4da4e28818f5017c96f0fde72d643e965ac78253 # 12:29 0- 5 Squash with 287f7a10372c (rcu: Process offlining and onlining only at grace-period start)
# extra tests on HEAD of rcu/rcu/dev
git bisect bad 4da4e28818f5017c96f0fde72d643e965ac78253 # 12:29 0- 12 Squash with 287f7a10372c (rcu: Process offlining and onlining only at grace-period start)
# extra tests on tree/branch rcu/rcu/dev
git bisect bad 4da4e28818f5017c96f0fde72d643e965ac78253 # 12:29 0- 12 Squash with 287f7a10372c (rcu: Process offlining and onlining only at grace-period start)
# extra tests with first bad commit reverted
# extra tests on tree/branch linus/master
git bisect good 796e1c55717e9a6ff5c81b12289ffa1ffd919b6f # 12:47 60+ 0 Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux
# extra tests on tree/branch next/master
git bisect good 272788cded4e29bc1f1cc97784b90364e6038639 # 13:20 60+ 0 Add linux-next specific files for 20150216
This script may reproduce the error.
----------------------------------------------------------------------------
#!/bin/bash
kernel=$1
initrd=quantal-core-i386.cgz
wget --no-clobber https://github.com/fengguang/reproduce-kernel-bug/raw/master/initrd/$initrd
kvm=(
qemu-system-x86_64
-cpu kvm64
-enable-kvm
-kernel $kernel
-initrd $initrd
-m 320
-smp 2
-net nic,vlan=1,model=e1000
-net user,vlan=1
-boot order=nc
-no-reboot
-watchdog i6300esb
-rtc base=localtime
-serial stdio
-display none
-monitor null
)
append=(
hung_task_panic=1
earlyprintk=ttyS0,115200
rd.udev.log-priority=err
systemd.log_target=journal
systemd.log_level=warning
debug
apic=debug
sysrq_always_enabled
rcupdate.rcu_cpu_stall_timeout=100
panic=-1
softlockup_panic=1
nmi_watchdog=panic
oops=panic
load_ramdisk=2
prompt_ramdisk=0
console=ttyS0,115200
console=tty0
vga=normal
root=/dev/ram0
rw
drbd.minor_count=8
)
"${kvm[@]}" --append "${append[*]}"
----------------------------------------------------------------------------
Thanks,
Fengguang
View attachment "dmesg-quantal-ivb41-33:20150217110840:i386-randconfig-r2-0217:3.19.0-rc1-00098-g4da4e28:79" of type "text/plain" (111628 bytes)
View attachment "config-3.19.0-rc1-00098-g4da4e28" of type "text/plain" (80539 bytes)
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