linux-kernel - Re: WARNING: at fs/proc/generic.c:717 remove_proc

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Message-Id: <20210330213350.719090a2c31e689eae268324@linux-foundation.org>
Date:   Tue, 30 Mar 2021 21:33:50 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     Linux-Next Mailing List <linux-next@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        linux-fsdevel@...r.kernel.org, lkft-triage@...ts.linaro.org,
        Bamvor Zhang Jian <bamvor.zhangjian@...aro.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        gladkov.alexey@...il.com, Colin King <colin.king@...onical.com>,
        Greg KH <gregkh@...gle.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Christian Brauner <christian.brauner@...ntu.com>,
        Pavel Skripkin <paskripkin@...il.com>,
        Jonathan Neuschäfer <j.neuschaefer@....net>,
        Kamlakant Patel <kamlakant.patel@...adcom.com>,
        Bamvor Jian Zhang <bamv2005@...il.com>,
        Bartosz Golaszewski <brgl@...ev.pl>
Subject: Re: WARNING: at fs/proc/generic.c:717 remove_proc_entry

On Tue, 30 Mar 2021 22:19:04 +0530 Naresh Kamboju <naresh.kamboju@...aro.org> wrote:

> While running kselftest gpio on x86_64 and i386 the following warnings were
> noticed and the device did not recover.

I doubt if changes in the core code caused this.  Let's cc the
gpoi-mockup developers.

> GOOD: next-20210329
> BAD: next-20210330
> 
> steps to reproduce:
> -------------------
> # Boot linux next tag 20210330 on x86_64 machine
> # cd /opt/kselftests/default-in-kernel/
> # ./gpio-mockup.sh --> which is doing modprobe gpio-mockup
> 
> Test log:
> ------------
> # selftests: gpio: gpio-mockup.sh
> # 1.  Module load tests
> # 1.1.  dynamic allocation of gpio
> # ./gpio-mockup.sh: line 106: ./gpio-mockup-cdev: No such file or directory
> # test failed: line value is 127 when 1 was[   46.136044]
> ------------[ cut here ]------------
> [   46.141916] remove_proc_entry: removing non-empty directory
> 'irq/3', leaking at least 'ttyS1'
>  expected
> # GPI[   46.150471] WARNING: CPU: 2 PID: 603 at
> /usr/src/kernel/fs/proc/generic.c:717 remove_proc_entry+0x1a8/0x1c0
> [   46.161566] Modules linked in: gpio_mockup(-) x86_pkg_temp_thermal fuse
> [   46.168195] CPU: 2 PID: 603 Comm: modprobe Not tainted
> 5.12.0-rc5-next-20210330 #1
> [   46.175793] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS
> 2.2 05/23/2018
> [   46.183217] RIP: 0010:remove_proc_entry+0x1a8/0x1c0
> O gpio-mockup te[   46.188128] Code: 40 bc 24 a8 48 c7 c7 98 4a 6a a8
> 48 0f 45 c2 49 8b 94 24 b0 00 00 00 4c 8b 80 d8 00 00 00 48 8b 92 d8
> 00 00 00 e8 38 36 cb ff <0f> 0b e9 5b ff ff ff e8 0c f4 c5 00 66 90 66
> 2e 0f 1f 84 00 00 00
> [   46.208252] RSP: 0018:ffff9da080293c58 EFLAGS: 00010286
> [   46.213511] RAX: 0000000000000000 RBX: ffff93e8403bcbb8 RCX: 0000000000000000
> [   46.220650] RDX: 0000000000000001 RSI: ffff93e9afb177f0 RDI: ffff93e9afb177f0
> [   46.227820] RBP: ffff9da080293c88 R08: 0000000000000001 R09: 0000000000000001
> [   46.235018] R10: ffff9da080293a80 R11: ffff9da080293a08 R12: ffff93e8403bcb00
> [   46.242165] R13: ffff93e840263100 R14: 0000000000000001 R15: 0000000000000000
> st FAIL
> [   46.249303] FS:  00007f7dc2501740(0000) GS:ffff93e9afb00000(0000)
> knlGS:0000000000000000
> [   46.258164] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [   46.263977] CR2: 00007f7dc1de67f0 CR3: 000000014f292003 CR4: 00000000003706e0
> [   46.271124] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [   46.278292] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> [   46.285459] Call Trace:
> [   46.287926]  unregister_irq_proc+0xf8/0x110
> [   46.292128]  free_desc+0x2e/0x70
> [   46.295393]  irq_free_descs+0x54/0x80
> [   46.299102]  irq_domain_free_irqs+0x11b/0x150
> [   46.303507]  irq_dispose_mapping+0x77/0x120
> [   46.307711]  gpio_mockup_dispose_mappings+0x4c/0x60 [gpio_mockup]
> [   46.313817]  devm_action_release+0x15/0x20
> [   46.317933]  release_nodes+0x11e/0x220
> [   46.321707]  devres_release_all+0x3c/0x50
> [   46.325733]  device_release_driver_internal+0x10e/0x1d0
> [   46.331016]  driver_detach+0x4d/0xa0
> [   46.334609]  bus_remove_driver+0x5f/0xe0
> [   46.338553]  driver_unregister+0x2f/0x50
> [   46.342495]  platform_driver_unregister+0x12/0x20
> [   46.347218]  gpio_mockup_exit+0x1f/0x5cc [gpio_mockup]
> [   46.352374]  __x64_sys_delete_module+0x15b/0x260
> [   46.357082]  do_syscall_64+0x37/0x50
> [   46.360676]  entry_SYSCALL_64_after_hwframe+0x44/0xae
> [   46.365748] RIP: 0033:0x7f7dc1e0f997
> [   46.369342] Code: 73 01 c3 48 8b 0d 01 a5 2b 00 f7 d8 64 89 01 48
> 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 b0 00 00
> 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d d1 a4 2b 00 f7 d8 64 89
> 01 48
> [   46.388108] RSP: 002b:00007ffe35506e78 EFLAGS: 00000206 ORIG_RAX:
> 00000000000000b0
> [   46.395708] RAX: ffffffffffffffda RBX: 000000000134ebd0 RCX: 00007f7dc1e0f997
> [   46.402883] RDX: 0000000000000000 RSI: 0000000000000800 RDI: 000000000134ec38
> [   46.410031] RBP: 0000000000000000 R08: 00007ffe35505e41 R09: 0000000000000000
> [   46.417183] R10: 00000000000008da R11: 0000000000000206 R12: 000000000134ec38
> [   46.424331] R13: 0000000000000001 R14: 000000000134ec38 R15: 00007ffe35508238
> [   46.431507] irq event stamp: 6645
> [   46.434845] hardirqs last  enabled at (6655): [<ffffffffa6e4fc4e>]
> console_unlock+0x34e/0x550
> [   46.443380] hardirqs last disabled at (6664): [<ffffffffa6e4fcb9>]
> console_unlock+0x3b9/0x550
> [   46.451915] softirqs last  enabled at (6564): [<ffffffffa800030e>]
> __do_softirq+0x30e/0x421
> [   46.460333] softirqs last disabled at (6559): [<ffffffffa6dce643>]
> irq_exit_rcu+0xb3/0xc0
> [   46.468548] ---[ end trace 89d0119dab1b1498 ]---
> [ 46.477938] remove_proc_entry: removing non-empty directory 'irq/4',
> leaking at least 'ttyS0'
> [ 46.486512] WARNING: CPU: 0 PID: 603 at
> /usr/src/kernel/fs/proc/generic.c:717 remove_proc_entry+0x1a8/0x1c0
> 
> Reported-by: Naresh Kamboju <naresh.kamboju@...aro.org>
> 
> metadata:
>   git branch: master
>   git repo: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
>   git describe: next-20210330
>   kernel-config:
> http://snapshots.linaro.org/openembedded/lkft/lkft/sumo/intel-corei7-64/lkft/linux-next/995/config
> 
> Full test log:
> https://lkft.validation.linaro.org/scheduler/job/2463479#L1481
> 
> https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20210330/testrun/4268028/suite/linux-log-parser/test/check-kernel-exception-2462521/log
> 
> -- 
> Linaro LKFT
> https://lkft.linaro.org