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Date: Wed, 30 Jul 2014 22:17:32 +0800
From: Fengguang Wu <fengguang.wu@...el.com>
To: Andy Lutomirski <luto@...capital.net>,
"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: Re: [x86,kaslr] [ 0.000000] WARNING: CPU: 0 PID: 0 at
arch/x86/kernel/cpu/common.c:1422 warn_pre_alternatives()
On Wed, Jul 30, 2014 at 10:07:56PM +0800, Fengguang Wu wrote:
> Hi Andy,
>
> Here is another WARNING message for the same commit.
>
> commit d07c7f1ed61789e175fa975134855be32263be2c
> Author: Andy Lutomirski <luto@...capital.net>
> AuthorDate: Tue Jul 15 18:34:20 2014 -0700
> Commit: Andy Lutomirski <luto@...capital.net>
> CommitDate: Wed Jul 16 10:01:27 2014 -0700
>
> x86,kaslr: Use MSR_KVM_GET_RNG_SEED for KASLR if available
>
> It's considerably better than any of the alternatives on KVM.
>
> Rather than reinventing all of the cpu feature query code, this fixes
> native_cpuid to work in PIC objects.
>
> I haven't combined it with boot/cpuflags.c's cpuid implementation:
> including asm/processor.h from boot/cpuflags.c results in a flood of
> unrelated errors, and fixing it might be messy.
>
> Signed-off-by: Andy Lutomirski <luto@...capital.net>
>
> +-------------------------------------------------------------------------+------------+------------+
> | | c6f07a6360 | d07c7f1ed6 |
> +-------------------------------------------------------------------------+------------+------------+
> | boot_successes | 1000 | 636 |
> | boot_failures | 0 | 84 |
> | WARNING:CPU:PID:at_arch/x86/kernel/cpu/common.c:warn_pre_alternatives() | 0 | 84 |
> | BUG:unable_to_handle_kernel_NULL_pointer_dereference | 0 | 84 |
> | Oops | 0 | 84 |
> | RIP:__free_pages_bootmem | 0 | 84 |
> | Kernel_panic-not_syncing:Fatal_exception | 0 | 84 |
> | backtrace:free_all_bootmem | 0 | 84 |
> | backtrace:mem_init | 0 | 84 |
> +-------------------------------------------------------------------------+------------+------------+
>
> [ 0.000000] PID hash table entries: 2048 (order: 2, 16384 bytes)
> [ 0.000000] xsave: enabled xstate_bv 0x7, cntxt size 0x0
> [ 0.000000] ------------[ cut here ]------------
> [ 0.000000] WARNING: CPU: 0 PID: 0 at arch/x86/kernel/cpu/common.c:1422 warn_pre_alternatives+0x1e/0x20()
> [ 0.000000] You're using static_cpu_has before alternatives have run!
> [ 0.000000] Modules linked in:
> [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 3.16.0-rc5-00004-gd07c7f1 #4
> [ 0.000000] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
> [ 0.000000] 0000000000000000 ffffffff81803c18 ffffffff813a7bd2 ffffffff81803c60
> [ 0.000000] ffffffff81803c50 ffffffff810a5485 ffffffff810102f9 ffffffff81803e08
> [ 0.000000] 0000000000000002 000000000000077c 0000000000000000 ffffffff81803cb0
> [ 0.000000] Call Trace:
> [ 0.000000] [<ffffffff813a7bd2>] dump_stack+0x4d/0x66
> [ 0.000000] [<ffffffff810a5485>] warn_slowpath_common+0x7f/0x98
> [ 0.000000] [<ffffffff810102f9>] ? warn_pre_alternatives+0x1e/0x20
> [ 0.000000] [<ffffffff810a54ea>] warn_slowpath_fmt+0x4c/0x4e
> [ 0.000000] [<ffffffff813b14e3>] ? restore_args+0x30/0x30
> [ 0.000000] [<ffffffff810102f9>] warn_pre_alternatives+0x1e/0x20
> [ 0.000000] [<ffffffff810378b5>] __do_page_fault+0x1bd/0x7ca
> [ 0.000000] [<ffffffff810f5782>] ? console_unlock+0x377/0x3c1
> [ 0.000000] [<ffffffff810e912e>] ? trace_hardirqs_off+0xd/0xf
> [ 0.000000] [<ffffffff813afcc5>] ? _raw_spin_unlock_irqrestore+0x40/0x5e
> [ 0.000000] [<ffffffff81b93d22>] ? __next_mem_range_rev+0x205/0x232
> [ 0.000000] [<ffffffff810e90e0>] ? trace_hardirqs_off_caller+0xe7/0x128
> [ 0.000000] [<ffffffff81226d8a>] ? trace_hardirqs_off_thunk+0x3a/0x3c
> [ 0.000000] [<ffffffff81037ee4>] do_page_fault+0x22/0x27
> [ 0.000000] [<ffffffff813b2378>] page_fault+0x28/0x30
> [ 0.000000] [<ffffffff81b74f76>] ? __free_pages_bootmem+0x2d/0xf9
> [ 0.000000] [<ffffffff81b78d61>] __free_memory_core+0xa7/0xbe
> [ 0.000000] [<ffffffff81b78fe9>] free_all_bootmem+0x51/0xd2
> [ 0.000000] [<ffffffff81b67188>] mem_init+0x5c/0x8d
> [ 0.000000] [<ffffffff81b53cca>] start_kernel+0x1f7/0x53d
> [ 0.000000] [<ffffffff81b53814>] ? set_init_arg+0x55/0x55
> [ 0.000000] [<ffffffff81b53120>] ? early_idt_handlers+0x120/0x120
> [ 0.000000] [<ffffffff81b53471>] x86_64_start_reservations+0x2a/0x2c
> [ 0.000000] [<ffffffff81b535b3>] x86_64_start_kernel+0x140/0x14d
> [ 0.000000] ---[ end trace e4962b91bd705c64 ]---
> [ 0.000000] BUG: unable to handle kernel NULL pointer dereference at 000000000000077c
Interestingly, the other bisect result for the above WARNING message
is
commit ddfb3b363440172d62ce62fbffdf046670d3ce2b
Author: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
AuthorDate: Fri Jul 11 11:30:24 2014 -0700
Commit: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
CommitDate: Mon Jul 14 04:48:30 2014 -0700
rcu: Create rcuo kthreads only for onlined CPUs
RCU currently uses for_each_possible_cpu() to spawn rcuo kthreads,
which can result in more rcuo kthreads than one would expect, for
example, derRichard reported 64 CPUs worth of rcuo kthreads on an
8-CPU image. This commit therefore creates rcuo kthreads only for
those CPUs that actually come online.
This was reported by derRichard on the OFTC IRC network.
Reported-by: Richard Weinberger <richard@....at>
Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.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.
+-------------------------------------------------------------------------+------------+------------+---------------+
| | 08e8ea1b45 | ddfb3b3634 | next-20140716 |
+-------------------------------------------------------------------------+------------+------------+---------------+
| boot_successes | 0 | 0 | 0 |
| boot_failures | 80 | 20 | 11 |
| BUG:unable_to_handle_kernel_NULL_pointer_dereference | 80 | 20 | 11 |
| Oops | 80 | 20 | 11 |
| RIP:__bitmap_or | 80 | 20 | 11 |
| Kernel_panic-not_syncing:Fatal_exception | 80 | 20 | 11 |
| backtrace:kernel_init_freeable | 80 | | |
| WARNING:CPU:PID:at_arch/x86/kernel/cpu/common.c:warn_pre_alternatives() | 0 | 20 | 11 |
| backtrace:async_page_fault | 0 | 20 | 11 |
| backtrace:rcu_init_one | 0 | 20 | 11 |
| backtrace:rcu_init | 0 | 20 | 11 |
+-------------------------------------------------------------------------+------------+------------+---------------+
[ 0.000000] Preemptible hierarchical RCU implementation.
[ 0.000000] RCU: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=2
[ 0.000000] ------------[ cut here ]------------
[ 0.000000] WARNING: CPU: 0 PID: 0 at arch/x86/kernel/cpu/common.c:1422 warn_pre_alternatives+0x2e/0x40()
[ 0.000000] You're using static_cpu_has before alternatives have run!
[ 0.000000] Modules linked in:
[ 0.000000] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.16.0-rc1-00050-gddfb3b3 #1
[ 0.000000] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
[ 0.000000] 0000000000000009 ffffffff82603bc8 ffffffff81cca80d ffffffff82603c10
[ 0.000000] ffffffff82603c00 ffffffff810e6627 0000000000000000 0000000000000000
[ 0.000000] 0000000000000000 ffffffff826186c0 00000000000000a8 ffffffff82603c60
[ 0.000000] Call Trace:
[ 0.000000] [<ffffffff81cca80d>] dump_stack+0xd2/0x18e
[ 0.000000] [<ffffffff810e6627>] warn_slowpath_common+0xc7/0x100
[ 0.000000] [<ffffffff810e6747>] warn_slowpath_fmt+0x57/0x70
[ 0.000000] [<ffffffff8100e23d>] ? print_context_stack+0x16d/0x210
[ 0.000000] [<ffffffff8102f69e>] warn_pre_alternatives+0x2e/0x40
[ 0.000000] [<ffffffff810839b6>] __do_page_fault+0x2a6/0x1110
[ 0.000000] [<ffffffff8116c112>] ? sched_clock_cpu+0x62/0x2b0
[ 0.000000] [<ffffffff81084ed6>] trace_do_page_fault+0x556/0x770
[ 0.000000] [<ffffffff8107c84b>] do_async_page_fault+0x3b/0x1d0
[ 0.000000] [<ffffffff81ce0d78>] async_page_fault+0x28/0x30
[ 0.000000] [<ffffffff81860e78>] ? __bitmap_or+0x38/0x50
[ 0.000000] [<ffffffff830bd666>] rcu_init_one+0x773/0xa5c
[ 0.000000] [<ffffffff830bdf59>] rcu_init+0x60a/0x6e9
[ 0.000000] [<ffffffff8308d891>] start_kernel+0x46f/0x9f9
[ 0.000000] [<ffffffff8308ce3f>] ? set_init_arg+0xec/0xec
[ 0.000000] [<ffffffff8308c120>] ? early_idt_handlers+0x120/0x120
[ 0.000000] [<ffffffff8308c775>] x86_64_start_reservations+0x64/0x6d
[ 0.000000] [<ffffffff8308c943>] x86_64_start_kernel+0x1c5/0x1db
[ 0.000000] ---[ end trace 6f39130c1118624e ]---
[ 0.000000] ------------[ cut here ]------------
git bisect start d4f4d1d45cd1b9aa60e61c2eab25a5d9a79a26f3 1795cd9b3a91d4b5473c97f491d63892442212ab --
git bisect good 8ab2f8e06b863345c4366c7b94935d105fd4ca01 # 04:50 20+ 0 Merge remote-tracking branch 'bluetooth/master'
git bisect good a37140130e816ab7965645bb7f5d2d62e6ed34ca # 05:06 20+ 0 Merge remote-tracking branch 'ftrace/for-next'
git bisect bad 302d91d7dd1ad5981fe014b65caac5ac3c84aed8 # 05:13 0- 3 Merge remote-tracking branch 'cgroup/for-next'
git bisect bad de129c7519ac0a86b31124ba79ad05102b30681d # 05:51 0- 1 Merge remote-tracking branch 'leds/for-next'
git bisect bad 67d8d9fec86b5f36a2dbecfdbe8adf59f4ce5906 # 06:34 0- 3 Merge remote-tracking branch 'xen-tip/linux-next'
git bisect bad f9274c7576848a9f0385a4206c6b78bbf40da54e # 06:52 0- 20 Merge remote-tracking branch 'kvm/linux-next'
git bisect bad bdc23fbab64e104ba656b931d9ed6ba9b4bc25f9 # 07:07 0- 20 Merge remote-tracking branch 'rcu/rcu/next'
git bisect good b41d1b924d0bd41a225a17f39297b9de0dca93d9 # 07:16 20+ 0 rcu: Fix a sparse warning in rcu_report_unblock_qs_rnp()
git bisect good e5ca9705168d0167ce68361045422acd12941be0 # 08:08 20+ 20 rcu: Remove remaining read-modify-write ACCESS_ONCE() calls
git bisect good f2c8bbd3e06206b7af836d62ece5fc73c393a3f6 # 08:29 20+ 20 rcu: Return false instead of 0 in rcu_nocb_adopt_orphan_cbs()
git bisect good 104c6d8fa94553b1b51f5d8094e619e4aa120b08 # 08:35 20+ 20 rcutorture: Use bash shell for all the test scripts
git bisect good 08e8ea1b45c2f62aadc6dff73ade2942a28030bb # 08:41 20+ 20 rcu: Rationalize kthread spawning
git bisect bad ddfb3b363440172d62ce62fbffdf046670d3ce2b # 08:47 0- 20 rcu: Create rcuo kthreads only for onlined CPUs
# first bad commit: [ddfb3b363440172d62ce62fbffdf046670d3ce2b] rcu: Create rcuo kthreads only for onlined CPUs
git bisect good 08e8ea1b45c2f62aadc6dff73ade2942a28030bb # 08:48 60+ 80 rcu: Rationalize kthread spawning
git bisect bad d4f4d1d45cd1b9aa60e61c2eab25a5d9a79a26f3 # 08:48 0- 11 Add linux-next specific files for 20140716
git bisect good b6603fe574af289dbe9eb9fb4c540bca04f5a053 # 08:57 60+ 0 Merge tag 'for-linus-20140716' of git://git.infradead.org/linux-mtd
git bisect bad d4f4d1d45cd1b9aa60e61c2eab25a5d9a79a26f3 # 08:57 0- 11 Add linux-next specific files for 20140716
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-ivb41-15:20140717084615:x86_64-randconfig-iv1-07170145::" of type "text/plain" (17865 bytes)
View attachment "dmesg-quantal-ivb41-100:20140717084820:x86_64-randconfig-iv1-07170145::" of type "text/plain" (29151 bytes)
Download attachment "x86_64-randconfig-iv1-07170145-d4f4d1d45cd1b9aa60e61c2eab25a5d9a79a26f3-WARNING:---at----warn_pre_alternatives+-x-74432.log" of type "application/octet-stream" (51445 bytes)
View attachment "config-3.16.0-rc1-00050-gddfb3b3" of type "text/plain" (63483 bytes)
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