linux-kernel - Re: [PATCH] EDAC: use debugfs_remove_recursive instead of debugfs

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Message-ID: <20151013094553.GA20700@pd.tnic>
Date:	Tue, 13 Oct 2015 11:45:53 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Tan Xiaojun <tanxiaojun@...wei.com>
Cc:	dougthompson@...ssion.com, mchehab@....samsung.com,
	linux-edac@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] EDAC: use debugfs_remove_recursive instead of
 debugfs_remove

On Tue, Oct 13, 2015 at 04:45:26PM +0800, Tan Xiaojun wrote:
> Sorry, I don't describe it well. I do test like that:
> 1)open EDAC config and open CONFIG_EDAC_DEBUG
> 2)insmod a edac_mc module (like i3000_edac or others in drivers/edac/)
> 3)rmmod this module
> 4)we can also see files under /sys/kernel/debug/edac/ like "fake_inject"
> 
> If you think this patch is OK, I will do patch in your branch and send V2.

Yes, please. I just triggered:

[  119.331642] EDAC DEBUG: mc_attr_release: Releasing device mc
[  159.735172] BUG: unable to handle kernel paging request at ffffffffa0056c80
[  159.742184] IP: [<ffffffff811fda90>] do_dentry_open.isra.15+0xe0/0x2d0
[  159.748755] PGD 3e0c067 PUD 3e0d063 PMD 43759e067 PTE 0
[  159.754059] Oops: 0000 [#1] PREEMPT SMP 
[  159.758026] Modules linked in: binfmt_misc nls_iso8859_15 nls_cp437 btrfs x86_pkg_temp_thermal coretemp kvm_intel xor kvm raid6_pq crc32_pclmul crc32c_intel ghash_clmulni_intel hmac drbg usbhid aesni_intel aes_x86_64 snd_hda_codec_hdmi glue_helper snd_hda_codec_realtek dcdbas lrw snd_hda_codec_generic dell_smm_hwmon gf128mul serio_raw snd_hda_intel ablk_helper iTCO_wdt iTCO_vendor_support cryptd snd_hda_codec efivars button acpi_cpufreq snd_hwdep snd_hda_core snd_pcm snd_timer snd lpc_ich mfd_core processor soundcore i2c_i801 [last unloaded: edac_core]
[  159.807818] CPU: 5 PID: 2120 Comm: grep Tainted: G        W       4.3.0-rc5+ #1
[  159.815130] Hardware name: Dell Inc. Precision T3600/0PTTT9, BIOS A13 05/11/2014
[  159.822526] task: ffff880439ef5b00 ti: ffff88001fc18000 task.ti: ffff88001fc18000
[  159.830009] RIP: 0010:[<ffffffff811fda90>]  [<ffffffff811fda90>] do_dentry_open.isra.15+0xe0/0x2d0
[  159.838984] RSP: 0018:ffff88001fc1bcc8  EFLAGS: 00010282
[  159.844291] RAX: ffffffffa0056c80 RBX: ffff8804390996c0 RCX: 0000000000000000
[  159.851418] RDX: ffff880439ef62b0 RSI: 0000000000000000 RDI: 00000000ffffffff
[  159.858545] RBP: ffff88001fc1bcf0 R08: 0000000000000000 R09: 0000000000000000
[  159.865679] R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000
[  159.872806] R13: ffff88043897baf8 R14: 0000000000008000 R15: ffff8804390996d0
[  159.879935] FS:  00007fa8aae6a700(0000) GS:ffff88043df40000(0000) knlGS:0000000000000000
[  159.888019] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  159.893760] CR2: ffffffffa0056c80 CR3: 0000000037b1e000 CR4: 00000000000406e0
[  159.900894] Stack:
[  159.902903]  ffff8804390996c0 ffff88001fc1bdf0 0000000000000000 0000000000008000
[  159.910357]  ffff88001fc1befc ffff88001fc1bd08 ffffffff811fef02 0000000000000000
[  159.917807]  ffff88001fc1bde0 ffffffff8120e6dd ffffffff810bfdfe ffff880439ef6300
[  159.925253] Call Trace:
[  159.927721]  [<ffffffff811fef02>] vfs_open+0x52/0x60
[  159.932691]  [<ffffffff8120e6dd>] path_openat+0x20d/0x16e0
[  159.938180]  [<ffffffff810bfdfe>] ? __lock_acquire+0x94e/0x2230
[  159.944094]  [<ffffffff810bfdfe>] ? __lock_acquire+0x94e/0x2230
[  159.950018]  [<ffffffff812114de>] do_filp_open+0x7e/0xe0
[  159.955333]  [<ffffffff81220737>] ? expand_files+0x217/0x300
[  159.961560]  [<ffffffff818360c1>] ? _raw_spin_unlock+0x31/0x50
[  159.967952]  [<ffffffff81221181>] ? __alloc_fd+0xb1/0x180
[  159.973899]  [<ffffffff811ff27c>] do_sys_open+0x12c/0x210
[  159.979844]  [<ffffffff811ff394>] SyS_openat+0x14/0x20
[  159.985527]  [<ffffffff81836bb6>] entry_SYSCALL_64_fastpath+0x16/0x7a
[  159.992506] Code: 00 81 4b 74 00 00 01 00 41 0f b7 45 00 66 25 00 f0 66 3d 00 80 0f 84 54 01 00 00 49 8b 85 d8 01 00 00 48 85 c0 0f 84 e0 00 00 00 <48> 8b 38 e8 88 48 f0 ff 84 c0 0f 84 d0 00 00 00 49 8b 85 d8 01 
[  160.012831] RIP  [<ffffffff811fda90>] do_dentry_open.isra.15+0xe0/0x2d0
[  160.020071]  RSP <ffff88001fc1bcc8>
[  160.024164] CR2: ffffffffa0056c80
[  160.028106] ---[ end trace afc84e562a248374 ]---

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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