lkml.org 
[lkml]   [2017]   [Sep]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [lkp-robot] [drivers] ceed73a2cf: drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c:#suspicious_rcu_dereference_check()usage
On 2017-09-19 19:55, kernel test robot wrote:
> FYI, we noticed the following commit:
>
> commit: ceed73a2cf4aff2921802aa3d21d45280677547d ("drivers: net:
> ethernet: qualcomm: rmnet: Initial implementation")
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
>
> in testcase: boot
>
> on test machine: qemu-system-i386 -enable-kvm -cpu Haswell,+smep,+smap
> -m 360M
>
> caused below changes (please refer to attached dmesg/kmsg for entire
> log/backtrace):
>
>
> +---------------------------------------------------------------------------------------------+------------+------------+
> |
> | cdf4969c42 | ceed73a2cf |
> +---------------------------------------------------------------------------------------------+------------+------------+
> | boot_successes
> | 52 | 44 |
> | boot_failures
> | 0 | 8 |
> |
> drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c:#suspicious_rcu_dereference_check()usage
> | 0 | 8 |
> +---------------------------------------------------------------------------------------------+------------+------------+
>
>
>
> [ 101.364846] WARNING: suspicious RCU usage
> [ 101.365654] 4.13.0-rc6-01701-gceed73a #1 Not tainted
> [ 101.370873] -----------------------------
> [ 101.372472] drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c:57
> suspicious rcu_dereference_check() usage!
> [ 101.374427]
> [ 101.374427] other info that might help us debug this:
> [ 101.374427]
> [ 101.387491]
> [ 101.387491] rcu_scheduler_active = 2, debug_locks = 1
> [ 101.389368] 1 lock held by trinity-main/2809:
> [ 101.390736] #0: (rtnl_mutex){+.+.+.}, at: [<8146085b>]
> rtnl_lock+0xf/0x11
> [ 101.395482]
> [ 101.395482] stack backtrace:
> [ 101.396948] CPU: 0 PID: 2809 Comm: trinity-main Not tainted
> 4.13.0-rc6-01701-gceed73a #1
> [ 101.398857] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
> BIOS 1.9.3-20161025_171302-gandalf 04/01/2014
> [ 101.401079] Call Trace:
> [ 101.401656] dump_stack+0xa1/0xeb
> [ 101.402871] lockdep_rcu_suspicious+0xc7/0xd0
> [ 101.403665] rmnet_is_real_dev_registered+0x40/0x4e
> [ 101.405199] rmnet_config_notify_cb+0x2c/0x142
> [ 101.406344] ? wireless_nlevent_flush+0x47/0x71
> [ 101.407385] notifier_call_chain+0x2d/0x47
> [ 101.408645] raw_notifier_call_chain+0xc/0xe
> [ 101.409882] call_netdevice_notifiers_info+0x41/0x49
> [ 101.411402] call_netdevice_notifiers+0xc/0xe
> [ 101.412713] rollback_registered_many+0x268/0x36e
> [ 101.413702] rollback_registered+0x39/0x56
> [ 101.414965] unregister_netdevice_queue+0x79/0x88
> [ 101.415908] unregister_netdev+0x16/0x1d
> [ 101.417030] gprs_attach+0x129/0x133
> [ 101.417700] pep_setsockopt+0xa2/0x118
> [ 101.418851] sock_common_setsockopt+0x13/0x18
> [ 101.420462] SyS_setsockopt+0x59/0x77
> [ 101.421196] SyS_socketcall+0x16c/0x1cf
> [ 101.422148] do_int80_syscall_32+0x57/0x11d
> [ 101.423137] entry_INT80_32+0x33/0x33
> [ 101.423827] EIP: 0x77fc61b2
> [ 101.424802] EFLAGS: 00000206 CPU: 0
> [ 101.425465] EAX: ffffffda EBX: 0000000e ECX: 7fc2cc50 EDX: 7fc2ccd0
> [ 101.426928] ESI: 00000005 EDI: 00000152 EBP: 77da037c ESP: 7fc2cc48
> [ 101.428482] DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b
>
> To reproduce:
>
> git clone https://github.com/intel/lkp-tests.git
> cd lkp-tests
> bin/lkp qemu -k <bzImage> job-script # job-script is attached
> in this email
>
>
>
> Thanks,
> Xiaolong

Hi Xiaolong

Thanks for the report.

I am somehow unable to reproduce this on my system.
There are some errors while running lkp.
I'll try to see if I can reproduce this some other way locally.

//some startup errors
cpio: root:lkp: invalid group

...
//errors while executing.

[child0:2600] move_pages (317) returned ENOSYS, marking as inactive.
*** glibc detected *** /trinity: double free or corruption (out):
0x08630000 ***
======= Backtrace: =========
/lib/i386-linux-gnu/libc.so.6(+0x73e42)[0x77e96e42]
/trinity[0x8058af6]
/trinity[0x8051888]
/trinity[0x8054894]
/trinity[0x804a9f5]
/trinity[0x804e3be]
/trinity[0x804a085]
/lib/i386-linux-gnu/libc.so.6(__libc_start_main+0xf3)[0x77e3c4d3]
...

//seems like there is an error while connecting to system bus.
//If this is a known error, is there a workaround for this?
[ 88.296910] init: tty6 main process ended, respawning
error: 'rc.local' exited outside the expected code flow.
[ 97.252708] init: Failed to create pty - disabling logging for job
[ 97.253484] init: Temporary process spawn error: No such file or
directory
[ 97.272202] init: rc main process (330) killed by TERM signal
unable to connect to system bus: Failed to connect to socket
/var/run/dbus/system_bus_socket: No such file or directory
[ 97.274761] init: tty4 main process (2618) killed by TERM signal
[ 97.276215] init: tty5 main process (2619) killed by TERM signal
[ 97.277613] init: tty2 main process (2620) killed by TERM signal
[ 97.279151] init: tty3 main process (2621) killed by TERM signal
[ 97.280569] init: tty6 main process (2622) killed by TERM signal
[ 97.282103] init: hwclock-save main process (2625) terminated with
status 70
[ 97.283737] init: plymouth-upstart-bridge main process (2626)
terminated with status 1
* Asking all remaining processes to terminate...
[ OK ]
* All processes ended within 1 seconds....
[ OK ]
* Deactivating swap...
[ OK ]
umount: /run/lock: not mounted
mount: / is busy
* Will now restart
[ 97.579289] Unregister pv shared memory for cpu 0
[ 97.580380] reboot: Restarting system
[ 97.580716] reboot: machine restart

--
Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a
Linux Foundation Collaborative Project

\
 
 \ /
  Last update: 2017-09-21 19:27    [W:0.083 / U:2.360 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site