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Date: Sat, 6 Aug 2016 11:04:18 -0700
From: Kees Cook <keescook@...omium.org>
To: kernel test robot <fengguang.wu@...el.com>
Cc: LKP <lkp@...org>, LKML <linux-kernel@...r.kernel.org>,
wfg@...ux.intel.com, Michael Ellerman <mpe@...erman.id.au>
Subject: Re: [lkdtm] 9a49a528dc: WARNING: CPU: 0 PID: 404 at
kernel/trace/ftrace.c:2005 ftrace_bug
This should be fixed by mpe's notrace patch for this function which
should be landing in 4.8 shortly.
-Kees
On Sat, Aug 6, 2016 at 4:05 AM, kernel test robot
<fengguang.wu@...el.com> wrote:
> Greetings,
>
> 0day kernel testing robot got the below dmesg and the first bad commit is
>
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>
> commit 9a49a528dcf3c2022ff89f700d5d0345b9abf288
> Author: Kees Cook <keescook@...omium.org>
> AuthorDate: Mon Feb 22 14:09:29 2016 -0800
> Commit: Kees Cook <keescook@...omium.org>
> CommitDate: Fri Jun 10 15:57:50 2016 -0700
>
> lkdtm: add function for testing .rodata section
>
> This adds a function that lives in the .rodata section. The section
> flags are corrected using objcopy since there is no way with gcc to
> declare section flags in an architecture-agnostic way.
>
> Signed-off-by: Kees Cook <keescook@...omium.org>
>
> +-------------------------------------------------------+------------+------------+------------+
> | | 426f3a53d4 | 9a49a528dc | 5eb7f58ccb |
> +-------------------------------------------------------+------------+------------+------------+
> | boot_successes | 876 | 255 | 57 |
> | boot_failures | 344 | 55 | 33 |
> | BUG:kernel_test_crashed | 344 | 53 | 31 |
> | WARNING:at_kernel/trace/ftrace.c:#ftrace_bug | 0 | 2 | 2 |
> | RIP:is_ftrace_trampoline | 0 | 2 | 2 |
> | Kernel_panic-not_syncing:Fatal_exception_in_interrupt | 0 | 2 | 2 |
> | backtrace:perf_ftrace_event_register | 0 | 2 | 2 |
> | backtrace:perf_trace_init | 0 | 2 | 2 |
> | backtrace:perf_tp_event_init | 0 | 2 | 2 |
> | backtrace:perf_try_init_event | 0 | 2 | 2 |
> | backtrace:perf_event_alloc | 0 | 2 | 2 |
> | backtrace:SyS_perf_event_open | 0 | 2 | 2 |
> +-------------------------------------------------------+------------+------------+------------+
>
> [ 11.152520] init: plymouth-splash main process (396) terminated with status 1
> [ 11.164728] init: networking main process (398) terminated with status 1
> [ 18.827856] ------------[ cut here ]------------
> [ 18.829473] WARNING: CPU: 0 PID: 404 at kernel/trace/ftrace.c:2005 ftrace_bug+0x145/0x400
> [ 18.833070] CPU: 0 PID: 404 Comm: trinity-main Not tainted 4.7.0-rc2-00303-g9a49a52 #1
> [ 18.835847] 0000000000000009 ffff880009093bf8 ffffffff81720b3c ffff880009093c38
> [ 18.838684] ffffffff810df9d2 000007d58112d8af ffff8800102a7e80 ffffffff81fe1db0
> [ 18.841697] 00000000000093e8 0000000000000001 ffffffff831b9330 ffff880009093c48
> [ 18.844511] Call Trace:
> [ 18.845424] [<ffffffff81720b3c>] dump_stack+0x19/0x1d
> [ 18.847204] [<ffffffff810df9d2>] __warn+0x112/0x150
> [ 18.848936] [<ffffffff810dfadd>] warn_slowpath_null+0x1d/0x20
> [ 18.851178] [<ffffffff8117a185>] ftrace_bug+0x145/0x400
> [ 18.853029] [<ffffffff81065129>] ftrace_replace_code+0x2c9/0x480
> [ 18.855130] [<ffffffff8117a556>] ftrace_modify_all_code+0x36/0xc0
> [ 18.857372] [<ffffffff810652ef>] arch_ftrace_update_code+0xf/0x20
> [ 18.859483] [<ffffffff8117a6d0>] ftrace_run_update_code+0x50/0x60
> [ 18.861813] [<ffffffff8117a7c3>] ftrace_startup_enable+0x33/0x50
> [ 18.863903] [<ffffffff8117bf6d>] ftrace_startup+0x13d/0x180
> [ 18.866205] [<ffffffff8117c94c>] register_ftrace_function+0x4c/0x60
> [ 18.868342] [<ffffffff81196597>] perf_ftrace_event_register+0x47/0x100
> [ 18.870749] [<ffffffff8119626b>] perf_trace_init+0x25b/0x280
> [ 18.872718] [<ffffffff811ab376>] perf_tp_event_init+0x56/0x90
> [ 18.874690] [<ffffffff811ab5f9>] perf_try_init_event+0xa9/0xd0
> [ 18.876806] [<ffffffff811abd2c>] perf_event_alloc+0x70c/0x1080
> [ 18.878818] [<ffffffff811b7ba8>] SyS_perf_event_open+0x928/0x17b0
> [ 18.881148] [<ffffffff81df25f9>] entry_SYSCALL_64_fastpath+0x1f/0xb8
> [ 18.883330] ---[ end trace 1cf1f82a14a663e2 ]---
> [ 18.884894] ftrace faulted on writing [<ffffffff81fe1db0>] lkdtm_rodata_do_nothing+0x0/0x10
>
> git bisect start 5eb7f58ccb08a2822f20afb2f4341474e1dece30 523d939ef98fd712632d93a5a2b588e477a7565e --
> git bisect bad 3b760b613b1536578a4576a73e9ba9ac359d3dfd # 15:06 151- 59 Merge 'linux-review/Wei-Yongjun/IB-core-Fix-possible-memory-leak-in-cma_resolve_iboe_route/20160805-215000' into devel-spot-201608061351
> git bisect bad 9e0b994e4fcc43853507dbdf87667f0195196858 # 15:10 0- 1 Merge 'linux-review/Dave-Carroll/aacraid-Check-size-values-after-double-fetch-from-user/20160806-034938' into devel-spot-201608061351
> git bisect bad 31b71e3e26f5a5c5acb43d2744c37079c9d7d9c2 # 15:14 0- 1 Merge 'perf/perf/core' into devel-spot-201608061351
> git bisect bad 330e37721baa51c0000b5ff1e09c99ba890f26d1 # 15:20 4- 4 Merge 'khilman-linux-amlogic/v4.7/integ' into devel-spot-201608061351
> git bisect good e434348347596a75a564d814f80ddbb2781101c7 # 15:43 309+ 136 0day base guard for 'devel-spot-201608061351'
> git bisect bad 94752aee4d53d037086ad8cb482d8ee29683f0f6 # 15:51 14- 11 Merge 'net/master' into devel-spot-201608061351
> git bisect bad ff9a082fda424257976f08fce942609f358015e0 # 16:01 6- 5 Merge tag 'media/v4.8-4' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media
> git bisect bad 9c1958fc326a0a0a533ec8e86ea6fa30977207de # 16:08 0- 3 Merge tag 'media/v4.8-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media
> git bisect bad c410614c902531d1ce2e46aec8ac91aa4dc89968 # 16:15 6- 4 Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
> git bisect bad b7545b79a1698b4cbcb5da94c105523b85ee7c90 # 16:20 2- 1 Merge tag 'usb-4.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
> git bisect good 78f5027132243b7071dc59ea6f717e2c48e12031 # 16:33 306+ 124 iio: pressure: bmp280: support device tree initialization
> git bisect bad 721413aff218118548b84b18cb5b49660e6e2940 # 16:39 17- 7 Merge tag 'tty-4.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
> git bisect bad 25a0dc4be86fc0d8c7e81bb5f8be8427022bf15f # 16:46 0- 1 Merge tag 'staging-4.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging
> git bisect bad 6d2e91a662256fd88ec0505567a59d21094ed415 # 16:56 60- 22 lkdtm: silence warnings about function declarations
> git bisect bad 2a7fbcec95add146f76ac4d187719b3db884f290 # 17:02 0- 1 Merge tag 'lkdtm-next' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux into char-misc-testing
> git bisect bad 63c0c076e590ed83050c80ada2e82adeac9de126 # 17:38 55- 26 nvmem: imx-ocotp: add COMPILE_TEST for proper test coverage
> git bisect bad dc1392727e32a5e467c13365e56e292e50ee084c # 17:47 42- 31 Merge tag 'lkdtm-next' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux into char-misc-testing
> git bisect bad 9a49a528dcf3c2022ff89f700d5d0345b9abf288 # 17:52 0- 1 lkdtm: add function for testing .rodata section
> git bisect good 426f3a53d4a1ffbe228f268e5c4af148686b7346 # 18:06 305+ 65 lkdtm: clean up after rename
> # first bad commit: [9a49a528dcf3c2022ff89f700d5d0345b9abf288] lkdtm: add function for testing .rodata section
> git bisect good 426f3a53d4a1ffbe228f268e5c4af148686b7346 # 18:28 913+ 344 lkdtm: clean up after rename
> # extra tests with CONFIG_DEBUG_INFO_REDUCED
> git bisect bad 9a49a528dcf3c2022ff89f700d5d0345b9abf288 # 18:43 42- 10 lkdtm: add function for testing .rodata section
> # extra tests on HEAD of linux-devel/devel-spot-201608061351
> git bisect bad 5eb7f58ccb08a2822f20afb2f4341474e1dece30 # 18:43 0- 33 0day head guard for 'devel-spot-201608061351'
> # extra tests on tree/branch linus/master
> git bisect bad a157b3aaa44829998d5a079174df989e5d8c20ff # 18:55 142- 47 Merge tag 'pwm/for-4.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm
> # extra tests on tree/branch linus/master
> git bisect bad a157b3aaa44829998d5a079174df989e5d8c20ff # 18:55 0- 54 Merge tag 'pwm/for-4.8-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm
> # extra tests on tree/branch linux-next/master
> git bisect bad 73497be0342a39f81d5d291a8e3b7238bd6b3381 # 19:02 29- 10 Add linux-next specific files for 20160805
>
>
> This script may reproduce the error.
>
> ----------------------------------------------------------------------------
> #!/bin/bash
>
> kernel=$1
> initrd=quantal-core-x86_64.cgz
>
> wget --no-clobber https://github.com/fengguang/reproduce-kernel-bug/raw/master/initrd/$initrd
>
> kvm=(
> qemu-system-x86_64
> -enable-kvm
> -cpu kvm64
> -kernel $kernel
> -initrd $initrd
> -m 300
> -smp 2
> -device e1000,netdev=net0
> -netdev user,id=net0
> -boot order=nc
> -no-reboot
> -watchdog i6300esb
> -watchdog-action debug
> -rtc base=localtime
> -serial stdio
> -display none
> -monitor null
> )
>
> append=(
> root=/dev/ram0
> hung_task_panic=1
> debug
> apic=debug
> sysrq_always_enabled
> rcupdate.rcu_cpu_stall_timeout=100
> panic=-1
> softlockup_panic=1
> nmi_watchdog=panic
> oops=panic
> load_ramdisk=2
> prompt_ramdisk=0
> systemd.log_level=err
> ignore_loglevel
> earlyprintk=ttyS0,115200
> console=ttyS0,115200
> console=tty0
> vga=normal
> rw
> drbd.minor_count=8
> )
>
> "${kvm[@]}" --append "${append[*]}"
> ----------------------------------------------------------------------------
>
> ---
> 0-DAY kernel test infrastructure Open Source Technology Center
> https://lists.01.org/pipermail/lkp Intel Corporation
--
Kees Cook
Nexus Security
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