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Date: Thu, 17 Jul 2014 07:33:27 +0000
From: "Su, Tao" <tao.su@...el.com>
To: "'luto@...capital.net'" <luto@...capital.net>
CC: "Chen, Jet" <jet.chen@...el.com>, "Su, Tao" <tao.su@...el.com>,
"Liu, Yuanhan" <yuanhan.liu@...el.com>,
"'lkp@...org'" <lkp@...org>,
"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>
Subject: FW: [LKP] [bisect done] [ 0.000000] WARNING: CPU: 0 PID: 0 at
arch/x86/kernel/cpu/common.c:1422 warn_pre_alternatives()
Greetings,
0day kernel testing robot got the below dmesg and the first bad commit is
git://internal_merge_and_test_tree devel-athens-mips-201407170120 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 | v3.16-rc5_071701 |
+-------------------------------------------------------------------------+------------+------------+------------------+
| boot_successes | 1000 | 636 | 18 |
| boot_failures | 0 | 84 | 3 |
| WARNING:CPU:PID:at_arch/x86/kernel/cpu/common.c:warn_pre_alternatives() | 0 | 84 | 3 |
| BUG:unable_to_handle_kernel_NULL_pointer_dereference | 0 | 84 | 3 |
| Oops | 0 | 84 | 3 |
| RIP:__free_pages_bootmem | 0 | 84 | 3 |
| Kernel_panic-not_syncing:Fatal_exception | 0 | 84 | 3 |
| backtrace:free_all_bootmem | 0 | 84 | 3 |
| backtrace:mem_init | 0 | 84 | 3 |
+-------------------------------------------------------------------------+------------+------------+------------------+
[ 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
git bisect start 5e60c2af7a8bde5cfaee8ffd77cfc5b62db0a04e 1795cd9b3a91d4b5473c97f491d63892442212ab --
git bisect good bc1f2f93f68bccd988af7e6f73384860ac241b78 # 09:04 720+ 0 Merge 'socfpga-nex/nios2-upstream' into devel-hourly-2014071701
git bisect bad 0d7e1ca40ef16fce5297579121717fc793761b38 # 09:04 0- 16 Merge 'dynticks/nohz/sysidle' into devel-hourly-2014071701
git bisect good 33c13bf2487a42efa1ac9bcce5623ab74a375c93 # 09:08 720+ 0 Merge 'ubifs/linux-next' into devel-hourly-2014071701
git bisect good 1032f73a32951d7f14ed7fdadedb0fef3c6d0f49 # 09:12 720+ 0 Merge 'spi/for-next' into devel-hourly-2014071701
git bisect bad 1f2859f0786338fe4c2a18ea518a5b2a2f1b5491 # 09:12 0- 126 Merge 'shawnguo/for-next' into devel-hourly-2014071701
git bisect good 73c47688a039158a6d395629d3ab32e606e13d1a # 09:24 720+ 0 Merge 'regulator/for-next' into devel-hourly-2014071701
git bisect bad b973fdf5e6e6fe84b51f79919e5dc8574ae859da # 09:27 27- 18 Merge 'luto/sync_rand_seed' into devel-hourly-2014071701
git bisect good 5778e65d5ca52bebbaa023e177d863e44f098e96 # 09:36 720+ 0 random,x86: Add arch_get_slow_rng_u64
git bisect bad d07c7f1ed61789e175fa975134855be32263be2c # 09:39 0- 9 x86,kaslr: Use MSR_KVM_GET_RNG_SEED for KASLR if available
git bisect good c6f07a63601fbb36c09bf250b5538abb47b51e44 # 09:44 720+ 0 random: Seed pools from arch_get_slow_rng_u64 at startup
# first bad commit: [d07c7f1ed61789e175fa975134855be32263be2c] x86,kaslr: Use MSR_KVM_GET_RNG_SEED for KASLR if available
git bisect good c6f07a63601fbb36c09bf250b5538abb47b51e44 # 09:46 1000+ 0 random: Seed pools from arch_get_slow_rng_u64 at startup
git bisect bad 5e60c2af7a8bde5cfaee8ffd77cfc5b62db0a04e # 09:48 0- 3 0day head guard for 'devel-hourly-2014071701'
git bisect good b6603fe574af289dbe9eb9fb4c540bca04f5a053 # 10:02 1000+ 0 Merge tag 'for-linus-20140716' of git://git.infradead.org/linux-mtd
git bisect good d4f4d1d45cd1b9aa60e61c2eab25a5d9a79a26f3 # 12:20 1000+ 0 Add linux-next specific files for 20140716
This script may reproduce the error.
----------------------------------------------------------------------------
#!/bin/bash
kernel=$1
kvm=(
qemu-system-x86_64
-enable-kvm
-cpu Haswell,+smep,+smap
-kernel $kernel
-m 320
-smp 1
-net nic,vlan=1,model=e1000
-net user,vlan=1
-boot order=nc
-no-reboot
-watchdog i6300esb
-rtc base=localtime
-serial stdio
-display none
-monitor null
)
append=(
hung_task_panic=1
earlyprintk=ttyS0,115200
debug
apic=debug
sysrq_always_enabled
rcupdate.rcu_cpu_stall_timeout=100
panic=10
softlockup_panic=1
nmi_watchdog=panic
prompt_ramdisk=0
console=ttyS0,115200
console=tty0
vga=normal
root=/dev/ram0
rw
drbd.minor_count=8
)
"${kvm[@]}" --append "${append[*]}"
----------------------------------------------------------------------------
Thanks,
Fengguang
View attachment "
"dmesg-yocto-kbuild-3120140717093821x86_64-randconfig-s0-071701553.16.0-rc5-00004-gd07c7f14"" of type "text/plain" (12904 bytes)
Download attachment "
"x86_64-randconfig-s0-07170155-5e60c2af7a8bde5cfaee8ffd77cfc5b62db0a04e-WARNING---at----warn_pre_alternatives+-x-108483.log"" of type "application/octet-stream" (120075 bytes)
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