linux-kernel - [lkp] [printk.c] ea0639c4d5: BUG:recent_printk

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Date:   Fri, 2 Dec 2016 01:12:32 +0800
From:   kernel test robot <xiaolong.ye@...el.com>
To:     Sebastian Duda <sebastian.duda@....de>
Cc:     linux-kernel@...cs.fau.de, Sebastian Duda <sebastian.duda@....de>,
        Tobias Baumeister <tobias.baumeister@....de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Borislav Petkov <bp@...e.de>, Tejun Heo <tj@...nel.org>,
        Thierry Reding <treding@...dia.com>,
        open list <linux-kernel@...r.kernel.org>, lkp@...org
Subject: [lkp] [printk.c]  ea0639c4d5: BUG:recent_printk_recursion


FYI, we noticed the following commit:

commit: ea0639c4d5c700ad63c0ace6a7a17877aac5b4c2 ("printk.c: removed unnecessary code")
url: https://github.com/0day-ci/linux/commits/Sebastian-Duda/printk-c-removed-unnecessary-code/20161130-225006


in testcase: trinity
with following parameters:

	runtime: 300s

test-description: Trinity is a linux system call fuzz tester.
test-url: http://codemonkey.org.uk/projects/trinity/


on test machine: qemu-system-i386 -enable-kvm -m 256M

caused below changes:


+-------------------------------------------------------+------------+------------+
|                                                       | ded6e842cf | ea0639c4d5 |
+-------------------------------------------------------+------------+------------+
| boot_successes                                        | 19         | 8          |
| boot_failures                                         | 3          | 49         |
| invoked_oom-killer:gfp_mask=0x                        | 1          |            |
| Mem-Info                                              | 1          |            |
| IP-Config:Auto-configuration_of_network_failed        | 2          |            |
| BUG:recent_printk_recursion                           | 0          | 47         |
| BUG_kmalloc-#(Tainted:G_S):Redzone_overwritten        | 0          | 11         |
| INFO:#-#.First_byte#instead_of                        | 0          | 11         |
| INFO:Allocated_in#age=#cpu=#pid=                      | 0          | 11         |
| INFO:Freed_in#age=#cpu=#pid=                          | 0          | 11         |
| INFO:Slab#objects=#used=#fp=#flags=                   | 0          | 11         |
| INFO:Object#@...set=#fp=                              | 0          | 11         |
| calltrace:SyS_read                                    | 0          | 11         |
| BUG_kmalloc-#(Tainted:G_S_B):Redzone_overwritten      | 0          | 6          |
| INFO:Allocated_in_do_syslog_age=#cpu=#pid=            | 0          | 4          |
| INFO:Freed_in_do_syslog_age=#cpu=#pid=                | 0          | 5          |
| INFO:Slab#objects=#used=#fp=0x(null)flags=            | 0          | 6          |
| BUG:unable_to_handle_kernel                           | 0          | 5          |
| Oops                                                  | 0          | 5          |
| EIP_is_at__slab_free                                  | 0          | 3          |
| calltrace:SyS_socketcall                              | 0          | 2          |
| Kernel_panic-not_syncing:Fatal_exception              | 0          | 4          |
| INFO:Allocated_in_pskb_expand_head_age=#cpu=#pid=     | 0          | 1          |
| INFO:Freed_in_skb_free_head_age=#cpu=#pid=            | 0          | 1          |
| calltrace:SyS_perf_event_open                         | 0          | 3          |
| calltrace:rcu_do_batch                                | 0          | 1          |
| calltrace:smpboot_thread_fn                           | 0          | 1          |
| Kernel_panic-not_syncing:Fatal_exception_in_interrupt | 0          | 1          |
| INFO:Allocated_in_sk_prot_alloc_age=#cpu=#pid=        | 0          | 1          |
| INFO:Freed_in__sk_destruct_age=#cpu=#pid=             | 0          | 1          |
| INFO:Allocated_in_alloc_fdmem_age=#cpu=#pid=          | 0          | 1          |
| INFO:Object#@...set=#fp=0x(null)                      | 0          | 1          |
| EIP_is_at_vlan_device_event                           | 0          | 2          |
| calltrace:vlan_device_event                           | 0          | 2          |
| calltrace:SyS_ioctl                                   | 0          | 2          |
+-------------------------------------------------------+------------+------------+



[   41.024699] --dropprivs is still in development, and really shouldn't be used unless you're helping development. Expect crashes.
[   41.024699] Going to run as user nobody (uid:1 gid:1)
[   41.024699] ctrl-c now unless you really know what you are doing.
[   42.078282] BUG: recent printk recursion!
[   42.276131] e1000: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX
[   42.384840] 8021q: adding VLAN 0 to HW filter on device eth0
[   44.409493] e1000: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: RX


To reproduce:

        git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
        cd lkp-tests
        bin/lkp qemu -k <bzImage> job-script  # job-script is attached in this email



Thanks,
Xiaolong

View attachment "config-4.9.0-rc7-00024-gea0639c" of type "text/plain" (122861 bytes)

View attachment "job-script" of type "text/plain" (3541 bytes)

Download attachment "dmesg.xz" of type "application/octet-stream" (18916 bytes)