Greetings, FYI here is an old bug, however is still active in mainline kernel. https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master commit a75a3f6fc92888e4119744d8594ffdf748c3d444 Merge: d2bea73 3bd2951 Author: Linus Torvalds <torvalds(a)linux-foundation.org&gt; AuthorDate: Tue Nov 3 18:59:10 2015 -0800 Commit: Linus Torvalds <torvalds(a)linux-foundation.org&gt; CommitDate: Tue Nov 3 18:59:10 2015 -0800 Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 asm changes from Ingo Molnar: "The main change in this cycle is another step in the big x86 system call interface rework by Andy Lutomirski, which moves most of the low level x86 entry code from assembly to C, for all syscall entries except native 64-bit system calls: arch/x86/entry/entry_32.S | 182 ++++------ arch/x86/entry/entry_64_compat.S | 547 ++++++++----------------------- 194 insertions(+), 535 deletions(-) ... our hope is that the final remaining step (converting native 64-bit system calls) will be less painful as all the previous steps, given that most of the legacies and quirks are concentrated around native 32-bit and compat environments" * 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (47 commits) x86/entry/32: Fix FS and GS restore in opportunistic SYSEXIT x86/entry/32: Fix entry_INT80_32() to expect interrupts to be on um/x86: Fix build after x86 syscall changes x86/asm: Remove the xyz_cfi macros from dwarf2.h selftests/x86: Style fixes for the 'unwind_vdso' test x86/entry/64/compat: Document sysenter_fix_flags's reason for existence x86/entry: Split and inline syscall_return_slowpath() x86/entry: Split and inline prepare_exit_to_usermode() x86/entry: Use pt_regs_to_thread_info() in syscall entry tracing x86/entry: Hide two syscall entry assertions behind CONFIG_DEBUG_ENTRY x86/entry: Micro-optimize compat fast syscall arg fetch x86/entry: Force inlining of 32-bit syscall code x86/entry: Make irqs_disabled checks in exit code depend on lockdep x86/entry: Remove unnecessary IRQ twiddling in fast 32-bit syscalls x86/asm: Remove thread_info.sysenter_return x86/entry/32: Re-implement SYSENTER using the new C path x86/entry/32: Switch INT80 to the new C syscall path x86/entry/32: Open-code return tracking from fork and kthreads x86/entry/compat: Implement opportunistic SYSRETL for compat syscalls x86/vdso/compat: Wire up SYSENTER and SYSCSALL for compat userspace ... +-----------------------------------------------------------+------------+------------+------------+-----------+ | | d2bea739f8 | 3bd29515d1 | a75a3f6fc9 | v4.10-rc8 | +-----------------------------------------------------------+------------+------------+------------+-----------+ | boot_successes | 118 | 69 | 13 | 46 | | boot_failures | 1 | 93 | 31 | 59 | | invoked_oom-killer:gfp_mask=0x | 1 | 2 | | | | Mem-Info | 1 | 2 | | | | Kernel_panic-not_syncing:Attempted_to_kill_init!exitcode= | 0 | 91 | 31 | 39 | | BUG:kernel_hang_in_test_stage | 0 | 0 | 0 | 19 | | BUG:kernel_reboot-without-warning_in_test_stage | 0 | 0 | 0 | 1 | +-----------------------------------------------------------+------------+------------+------------+-----------+ [ 3.184390] init[1]: segfault at ffffffffff600400 ip ffffffffff600400 sp 00007ffe879003c8 error 15 [ 3.185986] init[1] vsyscall attempted with vsyscall=none ip:ffffffffff600400 cs:33 sp:7ffe878ff8b8 ax:ffffffffff600400 si:7f2c3de62a4c di:7ffe878ff978 [ 3.188322] init[1]: segfault at ffffffffff600400 ip ffffffffff600400 sp 00007ffe878ff8b8 error 15 [ 3.189992] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b [ 3.189992] [ 3.190028] CPU: 0 PID: 1 Comm: init Not tainted 4.3.0-01035-ga75a3f6 #2 [ 3.190028] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.9.3-20161025_171302-gandalf 04/01/2014 [ 3.190028] ffffffff81c2ad00 ffff880000063c08 ffffffff81326a75 ffffffff810ceded [ 3.190028] ffffffff81a45f78 ffff880000063c88 ffffffff8113ab51 ffff88000005c060 [ 3.190028] ffff880000000010 ffff880000063c98 ffff880000063c38 ffff88000005c000 [ 3.190028] Call Trace: [ 3.190028] [<ffffffff81326a75>] dump_stack+0x4c/0x67 [ 3.190028] [<ffffffff810ceded>] ? console_unlock+0x2ed/0x320 [ 3.190028] [<ffffffff8113ab51>] panic+0xbc/0x1f6 [ 3.190028] [<ffffffff8108b3f3>] find_child_reaper+0xa3/0xb0 [ 3.190028] [<ffffffff8108b50c>] forget_original_parent+0x3c/0x1e0 [ 3.190028] [<ffffffff8108ca18>] exit_notify+0x38/0x1a0 [ 3.190028] [<ffffffff8108d209>] do_exit+0x2a9/0x400 [ 3.190028] [<ffffffff8108d427>] do_group_exit+0x87/0xc0 [ 3.190028] [<ffffffff81095d1e>] get_signal+0x33e/0x3a0 [ 3.190028] [<ffffffff8113bade>] ? printk+0x41/0x43 [ 3.190028] [<ffffffff810038bb>] do_signal+0x1b/0xd0 [ 3.190028] [<ffffffff810c0000>] ? do_sched_rt_period_timer+0x190/0x2b0 [ 3.190028] [<ffffffff8113bade>] ? printk+0x41/0x43 [ 3.190028] [<ffffffff810b3063>] ? vtime_account_user+0x93/0xb0 [ 3.190028] [<ffffffff8108621f>] exit_to_usermode_loop+0x4a/0x85 [ 3.190028] [<ffffffff81001437>] prepare_exit_to_usermode+0x27/0x40 [ 3.190028] [<ffffffff810010e5>] ? enter_from_user_mode+0x45/0x50 [ 3.190028] [<ffffffff8163d727>] retint_user+0x8/0x10 [ 3.190028] Kernel Offset: disabled Elapsed time: 10 git bisect start v4.4 v4.3 -- git bisect bad cd6caf550a2adc763c6301ecc0be01f422fb2aea # 08:07 0- 29 Merge tag 'for-linus-4.4' of git://git.code.sf.net/p/openipmi/linux-ipmi git bisect bad 713009809681e5a7871e96e6992692c805b4480b # 08:07 0- 26 Merge tag 'ext4_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4 git bisect bad ccf21b69a83afaee4d5499e0d03eacf23946e08c # 08:07 0- 26 Merge branch 'for-4.4/reservations' of git://git.kernel.dk/linux-block git bisect good b831ef2cad979912850e34f82415c0c5d59de8cb # 08:07 43+ 0 Merge branch 'ras-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip git bisect bad ccc9d4a6d640cbde05d519edeb727881646cf71b # 08:07 0- 28 Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 git bisect bad f323c49b300baf89e2cb4050b0def1856c0b1852 # 08:07 0- 28 Merge branch 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip git bisect bad a75a3f6fc92888e4119744d8594ffdf748c3d444 # 08:07 0- 31 Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip git bisect good 53528695ff6d8b77011bc818407c13e30914a946 # 08:07 43+ 0 Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip git bisect good d2bea739f8b41d620c235d81e00289d01169dc3c # 08:07 44+ 0 Merge branch 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip git bisect good 034042cc1e2837a584cda0a5e4fc2b0a96b74543 # 08:42 39+ 50 x86/entry/syscalls: Move syscall table declarations into asm/syscalls.h git bisect good 460d12453e1afe20416ce9536cfecb31d17a9abd # 09:07 38+ 21 x86/entry: Make irqs_disabled checks in exit code depend on lockdep git bisect good f5e6a9753ac2965564a14e6285a06f44043ed9c8 # 09:31 39+ 26 x86/entry: Split and inline syscall_return_slowpath() git bisect good af22aa7c766d50712b9afeca53e9e4208ce6284c # 09:47 40+ 23 x86/asm: Remove the xyz_cfi macros from dwarf2.h git bisect good 657c1eea0019e80685a84cbb1919794243a187c9 # 10:10 39+ 20 x86/entry/32: Fix entry_INT80_32() to expect interrupts to be on git bisect good 3bd29515d1cad26fa85a1a9b442de8816c1f5c54 # 10:24 39+ 21 x86/entry/32: Fix FS and GS restore in opportunistic SYSEXIT # first bad commit: [a75a3f6fc92888e4119744d8594ffdf748c3d444] Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip git bisect good d2bea739f8b41d620c235d81e00289d01169dc3c # 10:36 114+ 1 Merge branch 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip git bisect good 3bd29515d1cad26fa85a1a9b442de8816c1f5c54 # 11:12 115+ 89 x86/entry/32: Fix FS and GS restore in opportunistic SYSEXIT # extra tests with CONFIG_DEBUG_INFO_REDUCED git bisect bad a75a3f6fc92888e4119744d8594ffdf748c3d444 # 11:21 0- 8 Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip # extra tests on HEAD of linus/master git bisect bad 0722f57bfae9abbc673b9dbe495c7da2f64676ea # 11:21 0- 73 Merge tag 'drm-fixes-for-v4.10-final' of git://people.freedesktop.org/~airlied/linux # extra tests on tree/branch linus/master git bisect bad 6dc39c50e4aeb769c8ae06edf2b1a732f3490913 # 11:21 0- 67 Merge branch 'for-linus' of git://git.kernel.dk/linux-block # extra tests on tree/branch linus/master git bisect bad 6dc39c50e4aeb769c8ae06edf2b1a732f3490913 # 11:21 0- 67 Merge branch 'for-linus' of git://git.kernel.dk/linux-block # extra tests on tree/branch linux-next/master git bisect good 4ce4a759a3e221b5265ebd03c2f8888b69a7cf3e # 11:40 121+ 255 Add linux-next specific files for 20170217 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/lkp Intel Corporation