Greetings, 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/entry_compat commit 1c26267b7d2eedef3e5438fa94f837cd8dcabd6b Author: Andy Lutomirski <luto(a)kernel.org&gt; AuthorDate: Wed Aug 26 11:07:35 2015 -0700 Commit: Andy Lutomirski <luto(a)kernel.org&gt; CommitDate: Wed Aug 26 17:46:59 2015 -0700 x86/vdso: Remove runtime 32-bit vDSO selection 32-bit userspace will now always see the save vDSO, which is exactly what used to be the int80 vDSO. Subsequent patches will clean it up and make it support SYSENTER and SYSCALL using alternatives. Signed-off-by: Andy Lutomirski <luto(a)kernel.org&gt; +-----------------------------------------------------------+------------+------------+------------+ | | 3d239c0778 | 1c26267b7d | ebdf22afca | +-----------------------------------------------------------+------------+------------+------------+ | boot_successes | 63 | 0 | 0 | | boot_failures | 0 | 22 | 13 | | Kernel_panic-not_syncing:Attempted_to_kill_init!exitcode= | 0 | 22 | 13 | +-----------------------------------------------------------+------------+------------+------------+ [ 3.414131] Write protecting the kernel text: 9688k [ 3.414747] Write protecting the kernel read-only data: 5132k [ 3.415380] NX-protecting the kernel data: 10792k [ 3.416857] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000007 [ 3.416857] [ 3.418170] CPU: 0 PID: 1 Comm: init Not tainted 4.2.0-rc7-00087-g1c26267 #1 [ 3.419363] 41e7f387 00000001 00000001 40253dec 4196a39c 40253e04 41967899 00000001 [ 3.420613] 00000001 00000001 41e9e300 40253e50 41064bff 41d87790 00000007 40253e20 [ 3.422057] 4106fca6 0106f07a 00000001 4b3b5d60 40240040 00400500 40240040 00000000 [ 3.423560] Call Trace: [ 3.423851] [<4196a39c>] dump_stack+0x16/0x18 [ 3.424539] [<41967899>] panic+0xcb/0x258 [ 3.425267] [<41064bff>] do_exit+0x101f/0x10a0 [ 3.425861] [<4106fca6>] ? __sigqueue_free+0x46/0x50 [ 3.426719] [<41064d49>] do_group_exit+0x69/0x100 [ 3.427220] [<41074ae2>] get_signal+0xa62/0xc10 [ 3.427728] [<4100402e>] do_signal+0x1e/0xd40 [ 3.428191] [<4104b313>] ? kvm_clock_read+0x13/0x20 [ 3.428747] [<4100fb38>] ? sched_clock+0x8/0x10 [ 3.429245] [<4101860e>] ? convert_ip_to_linear+0xe/0x150 [ 3.430145] [<4104e5ec>] ? is_prefetch+0x11c/0x310 [ 3.431119] [<4104f797>] ? __do_page_fault+0x987/0x9c0 [ 3.431740] [<4104af00>] ? kvm_async_pf_task_wake+0x1c0/0x1c0 [ 3.432310] [<410021f7>] prepare_exit_to_usermode+0x127/0x220 [ 3.432889] [<4104af00>] ? kvm_async_pf_task_wake+0x1c0/0x1c0 [ 3.433464] [<41974209>] resume_userspace+0x19/0x20 [ 3.433961] Kernel Offset: disabled Elapsed time: 10 git bisect start ebdf22afca6568fd3ccbf01965d0cf2a8bfec706 a9c909ce8c7853b4fc16055c50eb50d91e20cb93 -- git bisect good 4b4d383594561d90d0b8a142c2f949da40eba6c4 # 09:57 20+ 0 x86/entry/64: Remove execve stubs git bisect bad 5becf6c59f5d58e71b8dceb75c4b448b0daf52e5 # 10:19 0- 19 x86/asm: Re-add manual CFI infrastructure git bisect good 3d239c077870c4ef0b2209437dbdadc4466d0529 # 10:31 22+ 0 selftests/x86: Add a test for vDSO unwinding git bisect bad 1c26267b7d2eedef3e5438fa94f837cd8dcabd6b # 10:47 0- 22 x86/vdso: Remove runtime 32-bit vDSO selection # first bad commit: [1c26267b7d2eedef3e5438fa94f837cd8dcabd6b] x86/vdso: Remove runtime 32-bit vDSO selection git bisect good 3d239c077870c4ef0b2209437dbdadc4466d0529 # 10:55 63+ 0 selftests/x86: Add a test for vDSO unwinding # extra tests with DEBUG_INFO git bisect bad 1c26267b7d2eedef3e5438fa94f837cd8dcabd6b # 11:03 0- 56 x86/vdso: Remove runtime 32-bit vDSO selection # extra tests on HEAD of luto/x86/entry_compat git bisect bad ebdf22afca6568fd3ccbf01965d0cf2a8bfec706 # 11:03 0- 13 x86/vdso/32: Save extra registers in the INT80 vsyscall path # extra tests on tree/branch luto/x86/entry_compat git bisect bad ebdf22afca6568fd3ccbf01965d0cf2a8bfec706 # 11:03 0- 13 x86/vdso/32: Save extra registers in the INT80 vsyscall path # extra tests on tree/branch linus/master git bisect good f9ed72dde34e3d5253e206e4bc3edbc6373015d6 # 11:20 66+ 0 Merge branch 'for-linus' of git://git.kernel.dk/linux-block # extra tests on tree/branch linux-next/master This script may reproduce the error. ---------------------------------------------------------------------------- #!/bin/bash kernel=$1 initrd=quantal-core-i386.cgz wget --no-clobber https://github.com/fengguang/reproduce-kernel-bug/raw/master/initrd/$initrd kvm=( qemu-system-x86_64 -enable-kvm -cpu kvm64 -kernel $kernel -initrd $initrd -m 300 -smp 2 -device e1000,netdev=net0 -netdev user,id=net0 -boot order=nc -no-reboot -watchdog i6300esb -rtc base=localtime -serial stdio -display none -monitor null ) append=( hung_task_panic=1 earlyprintk=ttyS0,115200 systemd.log_level=err debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 console=ttyS0,115200 console=tty0 vga=normal root=/dev/ram0 rw drbd.minor_count=8 ) "${kvm[@]}" --append "${append[*]}" ---------------------------------------------------------------------------- --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/lkp Intel Corporation