From: Michal Marek <mmarek@suse.com>
To: lkp@lists.01.org
Subject: Re: 867853145c: BUG: unable to handle kernel NULL pointer dereference at (null)
Date: Mon, 23 May 2016 10:10:55 +0200 [thread overview]
Message-ID: <5742BB0F.3010002@suse.com> (raw)
In-Reply-To: <573f8733.ksLR4voDAPkeXAYG%fengguang.wu@intel.com>
[-- Attachment #1: Type: text/plain, Size: 11354 bytes --]
On 2016-05-20 23:52, kernel test robot 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/next/linux-next.git master
>
> commit 867853145cea25491054ef067ff8af8946f37e2d
> Merge: 4bf284b 2441e78
> Author: Michal Marek <mmarek@suse.com>
> AuthorDate: Tue Apr 26 13:20:18 2016 +0200
> Commit: Michal Marek <mmarek@suse.com>
> CommitDate: Tue Apr 26 13:20:18 2016 +0200
>
> Merge branch 'kbuild/kbuild' into kbuild/for-next
Adding Nicolas to CC, because this is the merge commit of the
CONFIG_TRIM_UNUSED_KSYMS series.
>
> +------------------------------------------+------------+------------+------------+------------+
> | | 4bf284b277 | 2441e78b19 | 867853145c | f490734437 |
> +------------------------------------------+------------+------------+------------+------------+
> | boot_successes | 63 | 63 | 0 | 0 |
> | boot_failures | 0 | 0 | 22 | 13 |
> | BUG:unable_to_handle_kernel | 0 | 0 | 22 | 13 |
> | Oops | 0 | 0 | 22 | 13 |
> | RIP:strcpy | 0 | 0 | 22 | 13 |
> | Kernel_panic-not_syncing:Fatal_exception | 0 | 0 | 22 | 13 |
> | backtrace:of_unittest | 0 | 0 | 22 | 13 |
> | backtrace:kernel_init_freeable | 0 | 0 | 22 | 13 |
> +------------------------------------------+------------+------------+------------+------------+
>
> [ 24.609622] hd: no drives specified - use hd=cyl,head,sectors on kernel command line
> [ 24.611486] BIOS EDD facility v0.16 2004-Jun-25, 0 devices found
> [ 24.612525] EDD information not available.
> [ 24.614384] BUG: unable to handle kernel NULL pointer dereference at (null)
> [ 24.615776] IP: [<ffffffff817f158b>] strcpy+0xb/0x50
> [ 24.616700] PGD 0
> [ 24.617128] Oops: 0000 [#1] PREEMPT
> [ 24.617819] CPU: 0 PID: 1 Comm: swapper Not tainted 4.6.0-qxl-06423-gbac2892 #2
> [ 24.619079] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
> [ 24.620591] task: ffff8800002bc000 ti: ffff880000330000 task.ti: ffff880000330000
> [ 24.621943] RIP: 0010:[<ffffffff817f158b>] [<ffffffff817f158b>] strcpy+0xb/0x50
> [ 24.623264] RSP: 0000:ffff8800003339d8 EFLAGS: 00010297
> [ 24.624181] RAX: ffff88000c4600a8 RBX: ffff88000c4600a8 RCX: 0000000000000000
> [ 24.625395] RDX: 000000000000a2a1 RSI: 0000000000000000 RDI: ffff88000c4600a8
> [ 24.626623] RBP: ffff880000333d80 R08: 0000000000000001 R09: ffff88000c460000
> [ 24.627847] R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff82aa7620
> [ 24.629062] R13: ffff88000c4600a8 R14: ffff880000333e08 R15: ffff88000c4600aa
> [ 24.630281] FS: 0000000000000000(0000) GS:ffffffff8264a000(0000) knlGS:0000000000000000
> [ 24.631651] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 24.632635] CR2: 0000000000000000 CR3: 000000000260c000 CR4: 00000000000006f0
> [ 24.633856] Stack:
> [ 24.634218] ffff880000333d80 ffffffff81d5722a 0000000000011c48 ffff880000333e08
> [ 24.635584] 000000010fcc5390 0000000000000000 ffffffff824d0a08 ffff88000c1d9e98
> [ 24.636954] 0000000000000001 0000000000011b20 ffff88000c460000 ffff88000c460000
> [ 24.638323] Call Trace:
> [ 24.638764] [<ffffffff81d5722a>] ? unflatten_dt_nodes+0x8da/0xb90
> [ 24.639836] [<ffffffff811fe396>] ? ftrace_likely_update+0x56/0x2b0
> [ 24.640932] [<ffffffff81250a04>] ? get_page_from_freelist+0x4f4/0x15b0
> [ 24.642068] [<ffffffff811fe396>] ? ftrace_likely_update+0x56/0x2b0
> [ 24.643190] [<ffffffff811fe396>] ? ftrace_likely_update+0x56/0x2b0
> [ 24.644310] [<ffffffff811fe396>] ? ftrace_likely_update+0x56/0x2b0
> [ 24.645405] [<ffffffff811fe396>] ? ftrace_likely_update+0x56/0x2b0
> [ 24.646525] [<ffffffff812517fb>] ? get_page_from_freelist+0x12eb/0x15b0
> [ 24.647679] [<ffffffff811fe300>] ? disable_branch_tracing+0x50/0x70
> [ 24.648776] [<ffffffff811fe396>] ? ftrace_likely_update+0x56/0x2b0
> [ 24.649864] [<ffffffff81251e33>] ? __alloc_pages_nodemask+0x373/0x15c0
> [ 24.651059] [<ffffffff8181e3a3>] ? check_preemption_disabled+0x53/0x190
> [ 24.652208] [<ffffffff8114d571>] ? __lock_acquire+0x261/0xf20
> [ 24.653311] [<ffffffff811fe396>] ? ftrace_likely_update+0x56/0x2b0
> [ 24.654445] [<ffffffff81d56817>] ? kernel_tree_alloc+0x27/0x40
> [ 24.655469] [<ffffffff812b6ed5>] ? __kmalloc+0x145/0x460
> [ 24.656433] [<ffffffff81d575b9>] __unflatten_device_tree+0xd9/0x160
> [ 24.657583] [<ffffffff81d57a8f>] of_fdt_unflatten_tree+0x4f/0x80
> [ 24.658764] [<ffffffff82be25ac>] of_unittest+0xd1/0x259b
> [ 24.659769] [<ffffffff82be24db>] ? of_unittest_platform_populate+0x587/0x587
> [ 24.661029] [<ffffffff82b559dc>] do_one_initcall+0x1b1/0x302
> [ 24.662060] [<ffffffff82b55d30>] kernel_init_freeable+0x203/0x32d
> [ 24.663164] [<ffffffff81ea2c90>] kernel_init+0x20/0x240
> [ 24.664106] [<ffffffff81eb02cf>] ret_from_fork+0x1f/0x40
> [ 24.665048] [<ffffffff81ea2c70>] ? rest_init+0x130/0x130
> [ 24.665987] Code: 17 02 01 8d 52 20 0f b6 d2 39 d0 74 b0 29 d0 48 83 05 39 79 17 02 01 5d c3 0f 1f 80 00 00 00 00 48 8b 15 41 79 17 02 55 48 89 f8 <0f> b6 0e 48 89 e5 49 89 d0 49 f7 d8 4c 01 c6 49 01 f8 84 c9 88
> [ 24.670987] RIP [<ffffffff817f158b>] strcpy+0xb/0x50
> [ 24.671893] RSP <ffff8800003339d8>
> [ 24.672500] CR2: 0000000000000000
> [ 24.673093] ---[ end trace ac4a8162da5e779d ]---
> [ 24.673893] Kernel panic - not syncing: Fatal exception
>
> git bisect start f490734437e838c49921e7a8ec1a887d36b0cb14 2dcd0af568b0cf583645c8a317dd12e344b1c72a --
> git bisect bad 4e3ac701d37537f47cf4e8c051634fd6ae0ea524 # 03:36 0- 4 Merge 'linux-review/Bin-Liu/musb-fixes-for-v4-7-rc1/20160509-215819' into devel-hourly-2016051702
> git bisect bad da756d10374b4339984e25c053526bab5279a05c # 03:44 0- 5 Merge 'linux-review/Stephen-Boyd/msm_serial-cleanups/20160512-090700' into devel-hourly-2016051702
> git bisect good 8965cdd2b81e431c78fa9ad7f15f14e4485cc39c # 03:56 18+ 0 Merge 'kees/seccomp/tests' into devel-hourly-2016051702
> git bisect bad 453eba1192c10d54bc4f1db55ef32233c495e8fa # 04:01 0- 1 Merge 'linux-review/Peter-Rosin/ASoC-MAX9860-new-driver/20160513-153018' into devel-hourly-2016051702
> git bisect bad 543fae0bdb5f86713751e26164004db86e0056d3 # 04:06 0- 7 Merge 'kees/seccomp/report' into devel-hourly-2016051702
> git bisect good 77095d88c3a76ca12237b7301e06c76689848d2f # 04:15 21+ 4 Merge 'kees/kbuild/no-android' into devel-hourly-2016051702
> git bisect good 84c6298d7612e34a64de0e98b6b8d06fe026615b # 04:26 22+ 0 Merge 'linux-review/Alexey-Brodkin/arc-axs103_smp-Fix-CPU-frequency-to-100MHz-for-dual-core/20160516-180145' into devel-hourly-2016051702
> git bisect bad 4c61a3729f14604d1e20bcd8c3ad991b6f13096f # 04:31 0- 8 Merge 'omap/for-next' into devel-hourly-2016051702
> git bisect bad bac28921a3bc1ad30ca816288e11db0437ecf297 # 04:35 0- 1 Merge 'linux-review/Vineet-Gupta/scripts-bloat-o-meter-print-percent-change/20160513-152445' into devel-hourly-2016051702
> git bisect bad 867853145cea25491054ef067ff8af8946f37e2d # 04:41 0- 3 Merge branch 'kbuild/kbuild' into kbuild/for-next
> git bisect good fe69b420d39d307cfe2cba875dc1dbf668877198 # 04:48 21+ 0 kbuild: mark help target as PHONY
> git bisect good ba79d401f1aee52186ff09607e9405cfb805307d # 04:56 20+ 0 kbuild: fix call to adjust_autoksyms.sh when output directory specified
> git bisect good 27c3bffd230abd0a598586aed0fe0ba7b61e0e2e # 05:04 21+ 0 kbuild/mkspec: support 'update-bootloader'-based systems
> git bisect good 4bf284b27780335e827a1e39262ff664db6e548c # 05:12 21+ 0 Merge branch 'kbuild/misc' into kbuild/for-next
> git bisect good 2441e78b19192cd9ea1ce93027a5732a2117f026 # 05:19 22+ 0 kbuild: better abstract vmlinux sequential prerequisites
This is strange, because the diff between the good kbuild/kbuild branch
and the bad kbuild/for-next branch is just a few coccinelle patches and
a fix for make rpm:
$ git --no-pager diff --stat 2441e78b1919 867853145cea
scripts/coccinelle/api/setup_timer.cocci | 4 +-
scripts/coccinelle/misc/compare_const_fl.cocci | 171
-------------------------
scripts/package/mkspec | 5 +
3 files changed, 7 insertions(+), 173 deletions(-)
Michal
> # first bad commit: [867853145cea25491054ef067ff8af8946f37e2d] Merge branch 'kbuild/kbuild' into kbuild/for-next
> git bisect good 4bf284b27780335e827a1e39262ff664db6e548c # 05:22 61+ 0 Merge branch 'kbuild/misc' into kbuild/for-next
> git bisect good 2441e78b19192cd9ea1ce93027a5732a2117f026 # 05:26 61+ 0 kbuild: better abstract vmlinux sequential prerequisites
> # extra tests with DEBUG_INFO
> git bisect good 867853145cea25491054ef067ff8af8946f37e2d # 05:36 66+ 0 Merge branch 'kbuild/kbuild' into kbuild/for-next
> # extra tests on HEAD of linux-devel/devel-hourly-2016051702
> git bisect bad f490734437e838c49921e7a8ec1a887d36b0cb14 # 05:36 0- 13 0day head guard for 'devel-hourly-2016051702'
> # extra tests on tree/branch linux-next/master
> # extra tests on tree/branch linus/master
> git bisect good 6eb59af580dcffc6f6982ac8ef6d27a1a5f26b27 # 05:47 63+ 0 Merge tag 'mfd-for-linus-4.7' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd
> # extra tests on tree/branch linux-next/master
>
>
> 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
> -kernel $kernel
> -initrd $initrd
> -m 256
> -smp 1
> -device e1000,netdev=net0
> -netdev user,id=net0
> -boot order=nc
> -no-reboot
> -watchdog i6300esb
> -rtc base=localtime
> -serial stdio
> -display none
> -monitor null
> )
>
> append=(
> hung_task_panic=1
> earlyprintk=ttyS0,115200
> systemd.log_level=err
> debug
> apic=debug
> sysrq_always_enabled
> rcupdate.rcu_cpu_stall_timeout=100
> panic=-1
> softlockup_panic=1
> nmi_watchdog=panic
> oops=panic
> load_ramdisk=2
> prompt_ramdisk=0
> console=ttyS0,115200
> console=tty0
> vga=normal
> root=/dev/ram0
> rw
> drbd.minor_count=8
> )
>
> "${kvm[@]}" --append "${append[*]}"
> ----------------------------------------------------------------------------
>
> ---
> 0-DAY kernel test infrastructure Open Source Technology Center
> https://lists.01.org/pipermail/lkp Intel Corporation
>
next prev parent reply other threads:[~2016-05-23 8:10 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-20 21:52 867853145c: BUG: unable to handle kernel NULL pointer dereference at (null) kernel test robot
2016-05-23 8:10 ` Michal Marek [this message]
2016-05-23 13:49 ` Nicolas Pitre
2016-05-23 13:56 ` Michal Marek
2016-05-23 14:11 ` Fengguang Wu
2016-05-23 14:18 ` Fengguang Wu
2016-05-23 17:18 ` Nicolas Pitre
2016-05-25 12:48 ` Fengguang Wu
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