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Date: Mon, 6 Oct 2014 08:48:03 +0800
From: Fengguang Wu <fengguang.wu@...el.com>
To: Kees Cook <keescook@...omium.org>
Cc: "H. Peter Anvin" <hpa@...ux.intel.com>,
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: [x86, kaslr] PANIC: early exception 0e rip 10:ffffffff842122df error
0 cr2 ffffffff829c9798
Hi Kees,
There are a number of oops that are bisect to commit
82fa9637a2ba285bcc7c5050c73010b2c1b3d803 ("x86, kaslr: Select random
position from e820 maps"), unfortunately they are mostly hard to
reproduce (often only 1 out of 100 boots is bad). However this one is
very reproducible. I hope it can sever as a good case for debugging
this issue.
+------------------------------------------+------------+------------+---------------+
| | 5bfce5ef55 | 82fa9637a2 | next-20140919 |
+------------------------------------------+------------+------------+---------------+
| boot_successes | 1000 | 6 | 49 |
| boot_failures | 0 | 894 | 4 |
| PANIC:early_exception | 0 | 894 | 2 |
| BUG:kernel_boot_hang | 0 | 894 | 2 |
| general_protection_fault | 0 | 0 | 1 |
| RIP:__lock_acquire | 0 | 0 | 1 |
| Kernel_panic-not_syncing:Fatal_exception | 0 | 0 | 2 |
| backtrace:free_reserved_area | 0 | 0 | 1 |
| backtrace:free_init_pages | 0 | 0 | 1 |
| backtrace:populate_rootfs | 0 | 0 | 1 |
| backtrace:kernel_init_freeable | 0 | 0 | 1 |
| backtrace:kvm_get_tsc_khz | 0 | 0 | 2 |
| backtrace:kvmclock_init | 0 | 0 | 2 |
| BUG:unable_to_handle_kernel | 0 | 0 | 1 |
| Oops | 0 | 0 | 1 |
| RIP:setup_real_mode | 0 | 0 | 1 |
+------------------------------------------+------------+------------+---------------+
[ 0.000000] BRK [0x06bd4000, 0x06bd4fff] PGTABLE
[ 0.000000] BRK [0x06bd5000, 0x06bd5fff] PGTABLE
[ 0.000000] BRK [0x06bd6000, 0x06bd6fff] PGTABLE
PANIC: early exception 0e rip 10:ffffffff842122df error 0 cr2 ffffffff829c9798
[ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 3.12.0-rc4-00005-g82fa963 #1
PANIC: early exception 0e rip 10:ffffffff842126f6 error 0 cr2 ffffffff829c9798
BUG: kernel boot hang
Elapsed time: 305
qemu-system-x86_64 -cpu kvm64 -enable-kvm -kernel /kernel/x86_64-randconfig-ib1-09191856/82fa9637a2ba285bcc7c5050c73010b2c1b3d803/vmlinuz-3.12.0-rc4-00005-g82fa963 -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 link=/kbuild-tests/run-queue/kvm/x86_64-randconfig-ib1-09191856/next:master:82fa9637a2ba285bcc7c5050c73010b2c1b3d803:bisect-linux-5/.vmlinuz-82fa9637a2ba285bcc7c5050c73010b2c1b3d803-20140920200809-480-ivb41 branch=next/master BOOT_IMAGE=/kernel/x86_64-randconfig-ib1-09191856/82fa9637a2ba285bcc7c5050c73010b2c1b3d803/vmlinuz-3.12.0-rc4-00005-g82fa963 drbd.minor_count=8' -initrd /kernel-tests/initrd/yocto-minimal-x86_64.cgz -m 320 -smp 1 -net nic,vlan=1,model=e1000 -net user,vlan=1 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -pidfile /dev/shm/kboot/pid-yocto-ivb41-24 -serial file:/dev/shm/kboot/serial-yocto-ivb41-24 -daemonize -display none -monitor null
git bisect start v3.14 v3.13 --
git bisect bad 494479038d97f1b9f76fc633a360a681acdf035c # 02:20 373- 19 Merge tag 'pinctrl-v3.14-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl
git bisect bad 1b17366d695c8ab03f98d0155357e97a427e1dce # 02:33 310- 11 Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
git bisect bad 60eaa0190f6b39dce18eb1975d9773ed8bc9a534 # 02:44 153- 7 Merge tag 'trace-3.14' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
git bisect good 74e8ee8262c3f93bbc41804037b43f07b95897bb # 03:21 900+ 7 Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect bad 02d0a752460ea5dab34ce36c9ddc9c682e846a0d # 03:33 273- 8 Merge branch 'i2c/for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
git bisect bad 82b51734b4f228c76b6064b6e899d9d3d4c17c1a # 03:47 378- 16 Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
git bisect bad f4bcd8ccddb02833340652e9f46f5127828eb79d # 03:57 158- 1 Merge branch 'x86-kaslr-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect good fab5669d556200c4dd119af705bff14085845d1e # 04:21 900+ 0 Merge branch 'x86-ras-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect good 7fe67a1180db49d41a3f764c379a08f8e31580ec # 05:31 900+ 4 Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect bad 6145cfe394a7f138f6b64491c5663f97dba12450 # 05:50 3- 4 x86, kaslr: Raise the maximum virtual address to -1 GiB on x86_64
git bisect good 8ab3820fd5b2896d66da7bb2a906bc382e63e7bc # 20:01 900+ 0 x86, kaslr: Return location from decompress_kernel
git bisect bad 82fa9637a2ba285bcc7c5050c73010b2c1b3d803 # 20:13 0- 32 x86, kaslr: Select random position from e820 maps
git bisect good 5bfce5ef55cbe78ee2ee6e97f2e26a8a582008f3 # 22:04 900+ 0 x86, kaslr: Provide randomness functions
# first bad commit: [82fa9637a2ba285bcc7c5050c73010b2c1b3d803] x86, kaslr: Select random position from e820 maps
git bisect good 5bfce5ef55cbe78ee2ee6e97f2e26a8a582008f3 # 22:18 1000+ 0 x86, kaslr: Provide randomness functions
git bisect bad 6a10bca9b608df445baa23c3bfafc510d93d425b # 22:31 0- 4 Add linux-next specific files for 20140919
git bisect bad 46be7b73e82453447cd97b3440d523159eab09f8 # 22:44 169- 13 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/linux-btrfs
git bisect bad 6a10bca9b608df445baa23c3bfafc510d93d425b # 22:44 0- 4 Add linux-next specific files for 20140919
This script may reproduce the error.
----------------------------------------------------------------------------
#!/bin/bash
kernel=$1
kvm=(
qemu-system-x86_64
-cpu kvm64
-enable-kvm
-kernel $kernel
-m 320
-smp 1
-net nic,vlan=1,model=e1000
-net user,vlan=1
-boot order=nc
-no-reboot
-watchdog i6300esb
-rtc base=localtime
-serial stdio
-display none
-monitor null
)
append=(
hung_task_panic=1
earlyprintk=ttyS0,115200
debug
apic=debug
sysrq_always_enabled
rcupdate.rcu_cpu_stall_timeout=100
panic=-1
softlockup_panic=1
nmi_watchdog=panic
oops=panic
load_ramdisk=2
prompt_ramdisk=0
console=ttyS0,115200
console=tty0
vga=normal
root=/dev/ram0
rw
drbd.minor_count=8
)
"${kvm[@]}" --append "${append[*]}"
----------------------------------------------------------------------------
Thanks,
Fengguang
View attachment "dmesg-yocto-ivb41-24:20140920205200:x86_64-randconfig-ib1-09191856::" of type "text/plain" (4622 bytes)
Download attachment "x86_64-randconfig-ib1-09191856-6a10bca9b608df445baa23c3bfafc510d93d425b-PANIC:-early-exception-62310.log" of type "application/octet-stream" (148335 bytes)
View attachment "config-3.12.0-rc4-00005-g82fa963" of type "text/plain" (75184 bytes)
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