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Message-ID: <20140730034047.GA16537@localhost>
Date: Wed, 30 Jul 2014 11:40:47 +0800
From: Fengguang Wu <fengguang.wu@...el.com>
To: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc: Jet Chen <jet.chen@...el.com>, Su Tao <tao.su@...el.com>,
Yuanhan Liu <yuanhan.liu@...el.com>, LKP <lkp@...org>,
linux-kernel@...r.kernel.org
Subject: [RCU] BUG: sleeping function called from invalid context at
kernel/rcu/update.c:871
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_tasks.2014.07.28d
commit bd14ddc45614b61210fdf0ee4e94152948dd9d5e
Author: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
AuthorDate: Mon Jul 28 12:41:25 2014 -0700
Commit: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
CommitDate: Mon Jul 28 14:57:56 2014 -0700
rcu: Make RCU-tasks track exiting tasks
This commit adds synchronization with exiting tasks, so that RCU-tasks
avoids waiting on tasks that no longer exist.
Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Conflicts:
kernel/rcu/update.c
+--------------------------------------------------------------------------+------------+------------+
| | 4e73c5aafb | bd14ddc456 |
+--------------------------------------------------------------------------+------------+------------+
| boot_successes | 60 | 0 |
| boot_failures | 0 | 20 |
| BUG:sleeping_function_called_from_invalid_context_at_kernel/rcu/update.c | 0 | 20 |
| backtrace:do_group_exit | 0 | 20 |
| backtrace:SyS_exit_group | 0 | 20 |
| backtrace:do_exit | 0 | 0 |
+--------------------------------------------------------------------------+------------+------------+
[ 4.702913] Freeing unused kernel memory: 2000K (ffff88000200c000 - ffff880002200000)
[ 4.730428] Freeing unused kernel memory: 1880K (ffff88000262a000 - ffff880002800000)
[ 4.770934] random: init urandom read with 6 bits of entropy available
[ 4.793994] BUG: sleeping function called from invalid context at kernel/rcu/update.c:871
[ 4.802080] in_atomic(): 1, irqs_disabled(): 0, pid: 94, name: hostname
[ 4.808864] CPU: 0 PID: 94 Comm: hostname Not tainted 3.16.0-rc1-00010-gbd14ddc #1
[ 4.814520] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
[ 4.821278] ffff88000f2acac0 ffff88001322fe88 ffffffff81fdcc15 ffff88000f2acad0
[ 4.829295] ffff88001322fe98 ffffffff810cc549 ffff88001322feb0 ffffffff811099f9
[ 4.837254] ffff88000f2ad0d8 ffff88001322fec0 ffffffff81110a01 ffff88001322ff38
[ 4.845685] Call Trace:
[ 4.849022] [<ffffffff81fdcc15>] dump_stack+0x85/0xba
[ 4.853129] [<ffffffff810cc549>] __might_sleep+0x129/0x180
[ 4.857319] [<ffffffff811099f9>] exit_rcu_tasks+0x29/0xa0
[ 4.861615] [<ffffffff81110a01>] exit_rcu+0x11/0x20
[ 4.865672] [<ffffffff81097e65>] do_exit+0xa05/0xfc0
[ 4.870864] [<ffffffff810985b6>] do_group_exit+0x46/0x130
[ 4.875191] [<ffffffff810986b7>] SyS_exit_group+0x17/0x20
[ 4.878693] [<ffffffff81ff1ba9>] system_call_fastpath+0x16/0x1b
[ 5.081134] init: Failed to create pty - disabling logging for job
[ 5.083491] init: Temporary process spawn error: No such file or directory
[ 5.112668] init: Failed to create pty - disabling logging for job
git bisect start d4762699d270faa2e5f8cc9b4a1feefb98270e5b 64aa90f26c06e1cb2aacfb98a7d0eccfbd6c1a91 --
git bisect good c34f8002be490ebe4490ed028648598c8067fff7 # 10:55 16+ 0 Merge 'skn/cacheinfo' into devel-hourly-2014072909
git bisect good 27df6032094f4633a974397e845f76a6ed00bf89 # 10:58 16+ 0 Merge 'jolsa-perf/perf/ctf_convert_4' into devel-hourly-2014072909
git bisect good 93bb3907de114a5ada548126cdd99475fd2b5ae8 # 11:27 16+ 0 Merge 'jcmvbkbc-xtensa/xtensa-debug' into devel-hourly-2014072909
git bisect good 8d443796938e40aeedf7e9b38d56729fc3070d18 # 12:30 16+ 0 Merge 'wireless-testing/master' into devel-hourly-2014072909
git bisect good e45ccc6c7f65c2d6823eaf4c082417c455b9af4b # 12:38 16+ 0 Merge 'robclark/msm-next' into devel-hourly-2014072909
git bisect bad 21fa7826ce4c9938067972a47d8fa8fdba2805a3 # 12:41 0- 16 Merge 'rcu/rcu/rcu_tasks' into devel-hourly-2014072909
git bisect good 41d8e02382e1e79c17a78c0898bc938531000716 # 13:05 20+ 0 rcutorture: Add torture tests for RCU-tasks
git bisect good 4e73c5aafbe9108c83de0f8f5294e6ccad2e29c3 # 13:10 20+ 0 rcu: Add stall-warning checks for RCU-tasks
git bisect bad ebc6436166ae583e6db906eb7ffdb1c198921380 # 13:21 0- 4 rcu: Improve RCU-tasks energy efficiency
git bisect bad bd14ddc45614b61210fdf0ee4e94152948dd9d5e # 13:40 0- 20 rcu: Make RCU-tasks track exiting tasks
# first bad commit: [bd14ddc45614b61210fdf0ee4e94152948dd9d5e] rcu: Make RCU-tasks track exiting tasks
git bisect good 4e73c5aafbe9108c83de0f8f5294e6ccad2e29c3 # 13:45 60+ 0 rcu: Add stall-warning checks for RCU-tasks
git bisect bad d4762699d270faa2e5f8cc9b4a1feefb98270e5b # 14:30 0- 11 0day head guard for 'devel-hourly-2014072909'
git bisect good 31dab719fa50cf56d56d3dc25980fecd336f6ca8 # 14:38 60+ 0 Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
git bisect good e40cff4a7990e5d73eaad0a2f2593fe725e24cdd # 15:26 60+ 0 Add linux-next specific files for 20140728
This script may reproduce the error.
----------------------------------------------------------------------------
#!/bin/bash
kernel=$1
kvm=(
qemu-system-x86_64
-cpu kvm64
-enable-kvm
-kernel $kernel
-m 320
-smp 2
-net nic,vlan=1,model=e1000
-net user,vlan=1
-boot order=nc
-no-reboot
-watchdog i6300esb
-rtc base=localtime
-serial stdio
-display none
-monitor null
)
append=(
hung_task_panic=1
earlyprintk=ttyS0,115200
debug
apic=debug
sysrq_always_enabled
rcupdate.rcu_cpu_stall_timeout=100
panic=10
softlockup_panic=1
nmi_watchdog=panic
prompt_ramdisk=0
console=ttyS0,115200
console=tty0
vga=normal
root=/dev/ram0
rw
drbd.minor_count=8
)
"${kvm[@]}" --append "${append[*]}"
----------------------------------------------------------------------------
Thanks,
Fengguang
View attachment "dmesg-quantal-lkp-nex05-169:20140729134219:x86_64-randconfig-hsxa1-07291824::" of type "text/plain" (50256 bytes)
Download attachment "x86_64-randconfig-hsxa1-07291824-d4762699d270faa2e5f8cc9b4a1feefb98270e5b-BUG:-sleeping-function-called-from-invalid-context-at-78299.log" of type "application/octet-stream" (35499 bytes)
View attachment "config-3.16.0-rc1-00010-gbd14ddc" of type "text/plain" (83398 bytes)
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