Hi Andy, 0day kernel testing robot got the below dmesg and the first bad commit is git://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git x86/vsyscall commit caae204be184a575af2c02b837d818278f921323 Author: Andy Lutomirski <luto(a)amacapital.net&gt; AuthorDate: Mon Jun 16 18:50:12 2014 -0700 Commit: Andy Lutomirski <luto(a)amacapital.net&gt; CommitDate: Tue Sep 23 10:02:10 2014 -0700 x86_64,vsyscall: Make vsyscall emulation configurable This adds CONFIG_X86_VSYSCALL_EMULATION, guarded by CONFIG_EXPERT. Turning it off completely disables vsyscall emulation, saving ~3.5k for vsyscall_64.c, 4k for vsyscall_emu_64.S (the fake vsyscall page), some tiny amount of core mm code that supports a gate area, and possibly 4k for a wasted pagetable. The latter is because the vsyscall addresses are misaligned and fit poorly in the fixmap. Signed-off-by: Andy Lutomirski <luto(a)amacapital.net&gt; +-----------------------------------------------------------+------------+------------+------------------+ | | 2df87bdfa6 | caae204be1 | v3.17-rc6_092402 | +-----------------------------------------------------------+------------+------------+------------------+ | boot_successes | 156 | 27 | 47 | | boot_failures | 0 | 25 | 264 | | Kernel_panic-not_syncing:Attempted_to_kill_init_exitcode= | 0 | 25 | 264 | +-----------------------------------------------------------+------------+------------+------------------+ [ 5.248382] input: AT Translated Set 2 keyboard as /devices/platform/i8042/serio0/input/input1 [ 5.356741] init[1]: segfault at ffffffffff600400 ip ffffffffff600400 sp 00007fff5e2eecf8 error 15 [ 5.357984] init[1]: segfault at ffffffffff600400 ip ffffffffff600400 sp 00007fff5e2ee1b8 error 15 [ 5.359253] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b [ 5.359253] [ 5.360439] CPU: 0 PID: 1 Comm: init Not tainted 3.17.0-rc1-00169-gcaae204 #1 [ 5.361364] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 5.362114] 0000000000000000 ffff88001284fcb0 ffffffff814a2ce5 ffff88001284fd30 [ 5.363152] ffffffff814a1c51 0000000000000010 ffff88001284fd40 ffff88001284fcd8 [ 5.363611] ffff88001284fd78 000000000000000b 0000000000000000 ffff880012848740 [ 5.363611] Call Trace: [ 5.363611] [<ffffffff814a2ce5>] dump_stack+0x19/0x1b [ 5.363611] [<ffffffff814a1c51>] panic+0xc4/0x1ef [ 5.363611] [<ffffffff81090d2c>] do_exit+0x3bb/0x81e [ 5.363611] [<ffffffff811198c5>] ? __kmem_cache_free+0x11/0x2e [ 5.363611] [<ffffffff8111992c>] ? kmem_cache_free+0x31/0x33 [ 5.363611] [<ffffffff810962eb>] ? __sigqueue_free+0x33/0x36 [ 5.363611] [<ffffffff81091e90>] do_group_exit+0x45/0xbf [ 5.363611] [<ffffffff81098df9>] get_signal+0x53d/0x568 [ 5.363611] [<ffffffff81043039>] ? bad_area_nosemaphore+0xe/0x10 [ 5.363611] [<ffffffff81028218>] do_signal+0x23/0x885 [ 5.363611] [<ffffffff814a0000>] ? free_area_init_node+0xac/0x36e [ 5.363611] [<ffffffff81028a96>] do_notify_resume+0x1c/0x75 [ 5.363611] [<ffffffff814a927b>] retint_signal+0x48/0x8d [ 5.363611] Kernel Offset: 0x0 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffff9fffffff) Elapsed time: 10 git bisect start ddc5057b07ef7126431d5df5f5b176154896f560 0f33be009b89d2268e94194dc4fd01a7851b6d51 -- git bisect good ca66f746334c4a3abf469f758c9b0633987bc876 # 19:56 21+ 0 Merge 'linuxtv-media/devel-3.17-rc6' into devel-hourly-2014092402 git bisect good 46eba17a40aaafce6a606447c1fba1f316c331f7 # 20:09 21+ 0 Merge 'xen-tip/devel/for-linus-3.18' into devel-hourly-2014092402 git bisect good c68691d04897b6ecdeea62d994db0442388df6ff # 20:59 21+ 0 Merge 'pinctrl/devel' into devel-hourly-2014092402 git bisect bad 4c8c7dc7eaee7651e7f551879bcbf4bf47accc3d # 21:24 16- 5 Merge 'kgene-samsung/for-next' into devel-hourly-2014092402 git bisect good 351b6700979b25afd3bf9bac32ebad2d0d89a696 # 21:34 52+ 0 Merge 'pinctrl/for-next' into devel-hourly-2014092402 git bisect bad 34e91dce5b5a0df1dea8628d0ab8a349128a5d78 # 21:46 0- 52 Merge 'luto/x86/vsyscall' into devel-hourly-2014092402 git bisect good fcfee6f8749af14d96373a9e2656354ad0b95499 # 21:59 52+ 0 x86_64,vdso: Remove jiffies from the vvar page git bisect good 2dee11c0eb4eb9a767fa87764c91fda18d14eff1 # 22:07 52+ 0 x86_64,vsyscall: Turn vsyscalls all the way off when vsyscall=none git bisect bad caae204be184a575af2c02b837d818278f921323 # 22:14 0- 2 x86_64,vsyscall: Make vsyscall emulation configurable git bisect good 2df87bdfa6ac9076ed80bb83764b8b0f3ec396bd # 22:22 52+ 0 x86_64,vsyscall: Rewrite comment and clean up headers in vsyscall code # first bad commit: [caae204be184a575af2c02b837d818278f921323] x86_64,vsyscall: Make vsyscall emulation configurable git bisect good 2df87bdfa6ac9076ed80bb83764b8b0f3ec396bd # 22:24 156+ 0 x86_64,vsyscall: Rewrite comment and clean up headers in vsyscall code git bisect bad ddc5057b07ef7126431d5df5f5b176154896f560 # 22:24 0- 264 0day head guard for 'devel-hourly-2014092402' git bisect good f4cb707e7ad9727a046b463232f2de166e327d3e # 23:06 156+ 0 Merge tag 'pm+acpi-3.17-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm git bisect good 4d8426f9ac601db2a64fa7be64051d02b9c9fe01 # 23:22 156+ 0 Add linux-next specific files for 20140926 This script may reproduce the error. ---------------------------------------------------------------------------- #!/bin/bash kernel=$1 initrd=yocto-minimal-x86_64.cgz wget --no-clobber https://github.com/fengguang/reproduce-kernel-bug/raw/master/initrd/$initrd kvm=( qemu-system-x86_64 -enable-kvm -cpu Haswell,+smep,+smap -kernel $kernel -initrd $initrd -m 320 -smp 1 -net nic,vlan=1,model=e1000 -net user,vlan=1 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -serial stdio -display none -monitor null ) append=( hung_task_panic=1 earlyprintk=ttyS0,115200 debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 console=ttyS0,115200 console=tty0 vga=normal root=/dev/ram0 rw drbd.minor_count=8 ) "${kvm[@]}" --append "${append[*]}" ---------------------------------------------------------------------------- Thanks, Fengguang _______________________________________________ LKP mailing list LKP(a)linux.intel.com