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Date: Tue, 2 Sep 2014 12:58:30 +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: [percpu] BUG: unable to handle kernel NULL pointer dereference at
(null)
Hi Paul,
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 0e980234c97f98be6619b9281d83777f725b94ff
Author: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
AuthorDate: Wed Apr 16 10:07:09 2014 -0700
Commit: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
CommitDate: Wed May 14 09:46:10 2014 -0700
percpu: Fix raw_cpu_inc_return()
The definition for raw_cpu_add_return() uses the operation prefix
"raw_add_return_", but the definitions in the various percpu.h files
expect "raw_cpu_add_return_". This commit therefore appropriately
adjusts the definition of raw_cpu_add_return().
Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Acked-by: Christoph Lameter <cl@...ux.com>
Reviewed-by: Josh Triplett <josh@...htriplett.org>
===================================================
PARENT COMMIT NOT CLEAN. LOOK OUT FOR WRONG BISECT!
===================================================
Attached dmesg for the parent commit, too, to help confirm whether it is a noise error.
To me it looks like an unrelated warning.
+---------------------------------------------------------------+------------+------------+
| | afea227fd4 | 0e980234c9 |
+---------------------------------------------------------------+------------+------------+
| boot_successes | 40 | 0 |
| boot_failures | 40 | 20 |
| WARNING:at_kernel/events/core.c:perf_swevent_add() | 20 | |
| WARNING:at_kernel/trace/ring_buffer.c:rb_reserve_next_event() | 20 | 0 |
| backtrace:ring_buffer_producer_thread | 20 | |
| BUG:unable_to_handle_kernel_NULL_pointer_dereference | 0 | 20 |
| Oops | 0 | 20 |
| RIP:print_trace_line | 0 | 20 |
| Kernel_panic-not_syncing:Fatal_exception | 0 | 20 |
| backtrace:rcu_torture_stats | 0 | 20 |
| backtrace:register_tracer | 0 | 0 |
| backtrace:init_function_trace | 0 | 0 |
| backtrace:kernel_init_freeable | 0 | 0 |
+---------------------------------------------------------------+------------+------------+
[ 124.831322] rcu_bh: wait state: 1 ->state: 0x1
[ 124.831755] Dumping ftrace buffer:
[ 124.832087] ---------------------------------
[ 124.832532] BUG: unable to handle kernel NULL pointer dereference at (null)
[ 124.833290] IP: [<ffffffff8d596377>] print_trace_line+0x2c3/0x39b
[ 124.833916] PGD 12298067 PUD 122af067 PMD 0
[ 124.834367] Oops: 0000 [#1] PREEMPT SMP
[ 124.834783] CPU: 1 PID: 57 Comm: rcu_torture_sta Not tainted 3.15.0-rc1-00028-g0e98023 #18
[ 124.835658] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 124.836453] task: ffff880007ee6000 ti: ffff880007ee8000 task.ti: ffff880007ee8000
[ 124.837480] RIP: 0010:[<ffffffff8d596377>] [<ffffffff8d596377>] print_trace_line+0x2c3/0x39b
[ 124.838538] RSP: 0018:ffff880007ee9c98 EFLAGS: 00010093
[ 124.839033] RAX: 0000000000000000 RBX: ffffffff91104b50 RCX: 0000000000000000
[ 124.839698] RDX: 0000000000000001 RSI: ffffffff8ecfaf6b RDI: 0000000000000000
[ 124.840015] RBP: ffff880007ee9cc8 R08: 000000000000000a R09: 00000000fffffff4
[ 124.840015] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000003bd1201
[ 124.840015] R13: ffff8800123be014 R14: ffffffff91105c4c R15: 0000000000000000
[ 124.840015] FS: 0000000000000000(0000) GS:ffff880012600000(0000) knlGS:0000000000000000
[ 124.840015] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 124.840015] CR2: 0000000000000000 CR3: 00000000122a3000 CR4: 00000000000006a0
[ 124.840015] Stack:
[ 124.840015] ffff880007ee9c01 0000000000000001 0000000000000286 ffffffff91105c4c
[ 124.840015] 0000000000000000 0000000000000000 ffff880007ee9cf8 ffffffff8d598431
[ 124.840015] ffff880012d3414c ffffffff910ef5ac ffff880012d340ac ffff880012d3409e
[ 124.840015] Call Trace:
[ 124.840015] [<ffffffff8d598431>] ftrace_dump+0x177/0x20b
[ 124.840015] [<ffffffff8d55e995>] rcutorture_trace_dump+0x57/0x59
[ 124.840015] [<ffffffff8d55f35b>] rcu_torture_printk+0x4af/0x4cd
[ 124.840015] [<ffffffff8d55f3fc>] ? rcu_torture_stats_print+0x83/0x83
[ 124.840015] [<ffffffff8d55f3de>] rcu_torture_stats_print+0x65/0x83
[ 124.840015] [<ffffffff8d55f44a>] rcu_torture_stats+0x4e/0x73
[ 124.840015] [<ffffffff8d52386a>] kthread+0xef/0xf7
[ 124.840015] [<ffffffff8d52377b>] ? __kthread_parkme+0x80/0x80
[ 124.840015] [<ffffffff8e35e98c>] ret_from_fork+0x7c/0xb0
[ 124.840015] [<ffffffff8d52377b>] ? __kthread_parkme+0x80/0x80
[ 124.840015] Code: e9 e0 00 00 00 41 f7 c4 00 10 00 00 74 7c f6 83 d8 00 00 00 02 74 73 8b bb 20 21 00 00 4c 8b bb f0 10 00 00 e8 c4 b9 ff ff 89 c0 <49> 0f a3 07 19 c0 85 c0 75 55 8b bb 20 21 00 00 48 8b 43 10 48
[ 124.840015] RIP [<ffffffff8d596377>] print_trace_line+0x2c3/0x39b
[ 124.840015] RSP <ffff880007ee9c98>
[ 124.840015] CR2: 0000000000000000
[ 124.840015] ---[ end trace a89a2d8b0a3f71b2 ]---
[ 124.840015] Kernel panic - not syncing: Fatal exception
git bisect start v3.16 v3.15 --
git bisect bad 5170a3b24a9141e2349a3420448743b7c68f2223 # 20:13 0- 5 Merge branch 'akpm' (patches from Andrew Morton)
git bisect bad 1ad96bb0a20fa26b952b2250e89d14b6397bf618 # 20:18 0- 20 Merge tag 'gpio-v3.16-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio
git bisect bad 412dd3a6daf0cadce1b2d6a34fa3713f40255579 # 20:42 0- 20 Merge tag 'xfs-for-linus-3.16-rc1' of git://oss.sgi.com/xfs/xfs
git bisect bad b1cce8032f6abe900b078d24f3c3938726528f97 # 20:59 1- 20 Merge branch 'for-next' of git://git.samba.org/sfrench/cifs-2.6
git bisect bad da85d191f58a44e149a7c07dbae78b3042909798 # 21:08 0- 2 Merge branch 'for-3.16' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq
git bisect bad f8409abdc592e13cefbe4e4a24a84b3d5741e85f # 21:13 1- 20 Merge tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
git bisect bad ed81e780a7dd5698a986f246fad6a1d8d0b6f9ce # 21:17 0- 20 Merge branch 'x86-vdso-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect bad 3f17ea6dea8ba5668873afa54628a91aaa3fb1c0 # 21:35 0- 20 Merge branch 'next' (accumulated 3.16 merge window patches) into master
git bisect good 49eb7b0750d9483c74e9c14ae6ea1e9d62481c3c # 21:45 20+ 0 Merge tag 'tty-3.16-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty into next
git bisect bad 15b588303155b22edd559672905db8e59a44ef9a # 21:58 0- 12 Merge tag 'fbdev-omap-3.16' of git://git.kernel.org/pub/scm/linux/kernel/git/tomba/linux into next
git bisect bad 776edb59317ada867dfcddde40b55648beeb0078 # 22:04 0- 20 Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into next
git bisect good f456205265a61f1d649f8378eceaa163850cba4e # 22:10 20+ 0 Merge tag 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging into next
git bisect good e13cccfd86481bd4c0499577f44c570d334da79b # 22:27 20+ 0 Merge tag 'spi-v3.16' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi into next
git bisect good ff806d034ef8e9a95ff0b0532104dd65332e446b # 22:40 20+ 0 Merge branch 'for-v3.16' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping into next
git bisect bad 6348675c4e3612e001860354fea78258e041d9a1 # 22:55 0- 20 torture: Remove unused definition
git bisect good ab7d45053f99f44f81a221eb5c9fbe253ee94524 # 23:13 20+ 1 torture: Increase stutter-end intensity
git bisect bad d0d0606e2c13ad445a58b9d9547de617429cabf9 # 23:21 0- 20 rcutorture: Check for rcu_torture_fqs creation errors
git bisect good afea227fd4acf4f097a9e77bbc2f07d4856ebd01 # 23:33 20+ 20 rcutorture: Export RCU grace-period kthread wait state to rcutorture
git bisect bad 64e4b43ae050146fcfafe696e61efc306f73d449 # 23:41 0- 20 rcutorture: Make rcu_torture_reader() use cond_resched()
git bisect bad ac1bea85781e9004da9b3e8a4b097c18492d857c # 23:49 0- 20 sched,rcu: Make cond_resched() report RCU quiescent states
git bisect bad 0e980234c97f98be6619b9281d83777f725b94ff # 23:58 0- 20 percpu: Fix raw_cpu_inc_return()
# first bad commit: [0e980234c97f98be6619b9281d83777f725b94ff] percpu: Fix raw_cpu_inc_return()
git bisect good afea227fd4acf4f097a9e77bbc2f07d4856ebd01 # 00:00 60+ 40 rcutorture: Export RCU grace-period kthread wait state to rcutorture
git bisect bad 4cd8d82837097535d55ca63fee12f72c774b4a04 # 00:00 0- 11 0day head guard for 'devel-hourly-2014090117'
git bisect bad 69e273c0b0a3c337a521d083374c918dc52c666f # 00:02 0- 15 Linux 3.17-rc3
git bisect bad d7cf2b3139909a354a71e2885c942e21a60ea062 # 00:09 0- 9 Add linux-next specific files for 20140829
This script may reproduce the error.
----------------------------------------------------------------------------
#!/bin/bash
kernel=$1
initrd=quantal-core-x86_64.cgz
wget --no-clobber https://github.com/fengguang/reproduce-kernel-bug/raw/master/initrd/$initrd
kvm=(
qemu-system-x86_64
-cpu kvm64
-enable-kvm
-kernel $kernel
-initrd $initrd
-m 320
-smp 2
-net nic,vlan=1,model=e1000
-net user,vlan=1
-boot order=nc
-no-reboot
-watchdog i6300esb
-rtc base=localtime
-serial stdio
-display none
-monitor null
)
append=(
hung_task_panic=1
earlyprintk=ttyS0,115200
debug
apic=debug
sysrq_always_enabled
rcupdate.rcu_cpu_stall_timeout=100
panic=-1
softlockup_panic=1
nmi_watchdog=panic
oops=panic
load_ramdisk=2
prompt_ramdisk=0
console=ttyS0,115200
console=tty0
vga=normal
root=/dev/ram0
rw
drbd.minor_count=8
)
"${kvm[@]}" --append "${append[*]}"
----------------------------------------------------------------------------
Thanks,
Fengguang
View attachment "dmesg-quantal-vp-7:20140901235810:x86_64-randconfig-s1-09011848:3.15.0-rc1-00028-g0e98023:18" of type "text/plain" (220855 bytes)
View attachment "dmesg-quantal-kbuild-17:20140901235809:x86_64-randconfig-s1-09011848:3.15.0-rc1-00027-gafea227:4" of type "text/plain" (90285 bytes)
Download attachment "x86_64-randconfig-s1-09011848-4cd8d82837097535d55ca63fee12f72c774b4a04-BUG:-unable-to-handle-kernel-NULL-pointer-dereference-89855.log" of type "application/octet-stream" (121491 bytes)
View attachment "config-3.15.0-rc1-00028-g0e98023" of type "text/plain" (79561 bytes)
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