Date:   Tue, 1 Dec 2020 11:50:41 +0300
From:   Denis Kirjanov <kda@...ux-powerpc.org>
To:     kernel test robot <oliver.sang@...el.com>
Cc:     0day robot <lkp@...el.com>, LKML <linux-kernel@...r.kernel.org>,
        lkp@...ts.01.org, netdev@...r.kernel.org, kuba@...nel.org,
        davem@...emloft.net
Subject: Re: [net/af_unix] 556d816147: WARNING:lock_held_when_returning_to_user_space

On 12/1/20, kernel test robot <oliver.sang@...el.com> wrote:
>
> Greeting,
>
> FYI, we noticed the following commit (built with gcc-9):
>
> commit: 556d816147c0037356a73ecd04b56f7f88f8fd6c ("[PATCH v2] net/af_unix:
> don't create a path for a binded socket")

goto label after unix_mknod() should be fixed as well. I'll send a
next version shortly.

Thanks!


> url:
> https://github.com/0day-ci/linux/commits/Denis-Kirjanov/net-af_unix-don-t-create-a-path-for-a-binded-socket/20201130-213012
> base: https://git.kernel.org/cgit/linux/kernel/git/davem/net.git
> 4d521943f76bd0d1e68ea5e02df7aadd30b2838a
>
> in testcase: trinity
> version: trinity-static-i386-x86_64-f93256fb_2019-08-28
> 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 -cpu SandyBridge -smp 2 -m 8G
>
> caused below changes (please refer to attached dmesg/kmsg for entire
> log/backtrace):
>
>
> +------------------------------------------------+------------+------------+
> |                                                | 4d521943f7 | 556d816147
> |
> +------------------------------------------------+------------+------------+
> | WARNING:lock_held_when_returning_to_user_space | 0          | 6
> |
> | is_leaving_the_kernel_with_locks_still_held    | 0          | 6
> |
> +------------------------------------------------+------------+------------+
>
>
> If you fix the issue, kindly add following tag
> Reported-by: kernel test robot <oliver.sang@...el.com>
>
>
> [  168.905018] WARNING: lock held when returning to user space!
> [  168.905959] 5.10.0-rc5-00345-g556d816147c0 #2 Not tainted
> [  168.906832] ------------------------------------------------
> [  168.907688] trinity-c2/2496 is leaving the kernel with locks still held!
> [  168.908760] 1 lock held by trinity-c2/2496:
> [  168.909447]  #0: 421dc410 (&u->bindlock){....}-{3:3}, at:
> unix_bind+0xed/0x4c7
> [  176.087761] init: tty4 main process (2507) terminated with status 1
> [  176.090757] init: tty4 main process ended, respawning
> [  176.183929] init: tty5 main process (2510) terminated with status 1
> [  176.185225] init: tty5 main process ended, respawning
> [  176.197560] init: tty2 main process (2511) terminated with status 1
> [  176.198808] init: tty2 main process ended, respawning
> [  176.313912] init: tty3 main process (2517) terminated with status 1
> [  176.315179] init: tty3 main process ended, respawning
> [  176.343943] init: tty6 main process (2518) terminated with status 1
> [  176.345145] init: tty6 main process ended, respawning
> [  177.775764] [main] 116496 iterations. [F:86641 S:29411 HI:6256]
> [  177.775774]
> [  186.109795] init: tty4 main process (2702) terminated with status 1
> [  186.112880] init: tty4 main process ended, respawning
> [  186.207775] init: tty5 main process (2703) terminated with status 1
> [  186.208931] init: tty5 main process ended, respawning
> [  186.220373] init: tty2 main process (2704) terminated with status 1
> [  186.221503] init: tty2 main process ended, respawning
> [  186.337715] init: tty3 main process (2705) terminated with status 1
> [  186.339086] init: tty3 main process ended, respawning
> [  186.357629] init: tty6 main process (2706) terminated with status 1
> [  186.358989] init: tty6 main process ended, respawning
> [  191.008519] futex_wake_op: trinity-c3 tries to shift op by -1607; fix
> this program
> [  191.929811] [main] 126550 iterations. [F:94187 S:31885 HI:6256]
> [  191.929822]
> [  196.134002] init: tty4 main process (2825) terminated with status 1
> [  196.135420] init: tty4 main process ended, respawning
> [  196.244209] init: tty5 main process (2829) terminated with status 1
> [  196.245619] init: tty5 main process ended, respawning
> [  196.251326] init: tty2 main process (2830) terminated with status 1
> [  196.252673] init: tty2 main process ended, respawning
> [  196.357686] init: tty3 main process (2831) terminated with status 1
> [  196.359087] init: tty3 main process ended, respawning
> [  196.387854] init: tty6 main process (2832) terminated with status 1
> [  196.389207] init: tty6 main process ended, respawning
> [  202.998987] [main] 136876 iterations. [F:101871 S:34499 HI:6256]
> [  202.999000]
> [  206.157463] init: tty4 main process (2962) terminated with status 1
> [  206.163696] init: tty4 main process ended, respawning
> [  206.278220] init: tty5 main process (2963) terminated with status 1
> [  206.278928] init: tty5 main process ended, respawning
> [  206.280981] init: tty2 main process (2964) terminated with status 1
> [  206.281659] init: tty2 main process ended, respawning
> [  206.387845] init: tty3 main process (2966) terminated with status 1
> [  206.388527] init: tty3 main process ended, respawning
> [  206.427813] init: tty6 main process (2971) terminated with status 1
> [  206.428470] init: tty6 main process ended, respawning
> [  212.579273] [main] 147488 iterations. [F:109823 S:37124 HI:6607]
> [  212.579281]
> [  216.183874] init: tty4 main process (3142) terminated with status 1
> [  216.185161] init: tty4 main process ended, respawning
> [  216.293768] init: tty5 main process (3143) terminated with status 1
> [  216.294828] init: tty5 main process ended, respawning
> [  216.299943] init: tty2 main process (3144) terminated with status 1
> [  216.300976] init: tty2 main process ended, respawning
> [  216.397783] init: tty3 main process (3147) terminated with status 1
> [  216.399510] init: tty3 main process ended, respawning
> [  216.443459] init: tty6 main process (3148) terminated with status 1
> [  216.444113] init: tty6 main process ended, respawning
> [  219.779234] [main] 157599 iterations. [F:117378 S:39654 HI:7346]
> [  219.779243]
> [  226.207416] init: tty4 main process (3391) terminated with status 1
> [  226.208093] init: tty4 main process ended, respawning
> [  226.317687] init: tty5 main process (3392) terminated with status 1
> [  226.318384] init: tty5 main process ended, respawning
> [  226.320583] init: tty2 main process (3393) terminated with status 1
> [  226.321232] init: tty2 main process ended, respawning
> [  226.417465] init: tty3 main process (3395) terminated with status 1
> [  226.418163] init: tty3 main process ended, respawning
> [  226.457388] init: tty6 main process (3396) terminated with status 1
> [  226.458074] init: tty6 main process ended, respawning
> [  231.591603] [main] 168030 iterations. [F:125172 S:42250 HI:7346]
> [  231.591610]
> [  236.224759] init: tty4 main process (3549) terminated with status 1
> [  236.237822] init: tty4 main process ended, respawning
> [  236.343557] init: tty5 main process (3550) terminated with status 1
> [  236.344269] init: tty5 main process ended, respawning
> [  236.349639] init: tty2 main process (3551) terminated with status 1
> [  236.350290] init: tty2 main process ended, respawning
> [  236.443704] init: tty3 main process (3552) terminated with status 1
> [  236.444426] init: tty3 main process ended, respawning
> [  236.473608] init: tty6 main process (3553) terminated with status 1
> [  236.474288] init: tty6 main process ended, respawning
> [  240.424978] [main] 179511 iterations. [F:133832 S:45042 HI:7346]
> [  240.424985]
> [  246.249597] init: tty4 main process (3729) terminated with status 1
> [  246.251721] init: tty4 main process ended, respawning
> [  246.358025] init: tty5 main process (3740) terminated with status 1
> [  246.358733] init: tty5 main process ended, respawning
> [  246.368360] init: tty2 main process (3741) terminated with status 1
> [  246.369005] init: tty2 main process ended, respawning
> [  246.458022] init: tty3 main process (3742) terminated with status 1
> [  246.460142] init: tty3 main process ended, respawning
> [  246.487940] init: tty6 main process (3743) terminated with status 1
> [  246.488606] init: tty6 main process ended, respawning
>
>
> To reproduce:
>
>         # build kernel
> 	cd linux
> 	cp config-5.10.0-rc5-00345-g556d816147c0 .config
> 	make HOSTCC=gcc-9 CC=gcc-9 ARCH=i386 olddefconfig prepare modules_prepare
> bzImage
>
>         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,
> Oliver Sang
>
>

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