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Message-ID: <1428974390.6726.677.camel@intel.com>
Date:	Tue, 14 Apr 2015 09:19:50 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	NeilBrown <neilb@...e.de>
Cc:	LKML <linux-kernel@...r.kernel.org>, LKP ML <lkp@...org>
Subject: [LKP] [VFS/namei] baadac330e4: WARNING: CPU: 1 PID: 385 at
 fs/dcache.c:274 dentry_free+0x29/0x66()

FYI, we noticed the below changes on

git://neil.brown.name/md devel
commit baadac330e414eabccc2d6ea1d426fa2e40454a7 ("VFS/namei: enable RCU-walk when following symlinks.")


+-------------------------------------------------------------+------------+------------+
|                                                             | 1bda3501e0 | baadac330e |
+-------------------------------------------------------------+------------+------------+
| boot_successes                                              | 22         | 10         |
| early-boot-hang                                             | 1          |            |
| boot_failures                                               | 0          | 10         |
| WARNING:at_fs/dcache.c:#dentry_free()                       | 0          | 10         |
| BUG:Bad_page_state_in_process                               | 0          | 1          |
| BUG:unable_to_handle_kernel                                 | 0          | 7          |
| Kernel_panic-not_syncing:CRED:put_cred_rcu()sees#with_usage | 0          | 1          |
| Oops                                                        | 0          | 6          |
| RIP:kmem_cache_alloc                                        | 0          | 4          |
| backtrace:do_sys_open                                       | 0          | 10         |
| backtrace:SyS_open                                          | 0          | 10         |
| backtrace:do_fork                                           | 0          | 1          |
| backtrace:SyS_clone                                         | 0          | 1          |
| backtrace:user_path_at                                      | 0          | 4          |
| backtrace:SyS_faccessat                                     | 0          | 4          |
| backtrace:SyS_access                                        | 0          | 4          |
| backtrace:vfs_stat                                          | 0          | 2          |
| backtrace:SyS_newstat                                       | 0          | 2          |
| WARNING:at_kernel/module.c:#module_put()                    | 0          | 1          |
| Kernel_panic-not_syncing:Fatal_exception                    | 0          | 5          |
| RIP:map_id_up                                               | 0          | 1          |
| backtrace:cp_new_stat                                       | 0          | 1          |
| backtrace:SyS_newfstat                                      | 0          | 1          |
| RIP:radix_tree_next_chunk                                   | 0          | 1          |
| backtrace:link_path_walk                                    | 0          | 1          |
| backtrace:path_init                                         | 0          | 1          |
| RIP:down_write                                              | 0          | 1          |
| general_protection_fault                                    | 0          | 1          |
| RIP:mntput_no_expire                                        | 0          | 1          |
| RIP:legitimize_mnt                                          | 0          | 1          |
| backtrace:mprotect_fixup                                    | 0          | 1          |
| backtrace:SyS_mprotect                                      | 0          | 1          |
| backtrace:do_group_exit                                     | 0          | 1          |
| backtrace:SyS_exit_group                                    | 0          | 1          |
+-------------------------------------------------------------+------------+------------+

When running xfstests, system panic with the following warning in dmesg.

[  178.642528] XFS (vdd): Quotacheck needed: Please wait.
[  178.742321] XFS (vdd): Quotacheck: Done.
[  178.766701] ------------[ cut here ]------------
[  178.768403] WARNING: CPU: 1 PID: 385 at fs/dcache.c:274 dentry_free+0x29/0x66()
[  178.771585] Modules linked in: ipmi_watchdog ipmi_msghandler microcode acpi_cpufreq processor
[  178.775362] CPU: 1 PID: 385 Comm: setquota Not tainted 4.0.0-rc7-00076-gd06842f #1
[  178.779048] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140531_083030-gandalf 04/01/2014
[  178.781978]  0000000000000009 ffff88007e247c78 ffffffff81a13ec9 ffff88007828ecf8
[  178.785243]  0000000000000000 ffff88007e247cb8 ffffffff810edd33 ffff88007e247dc8
[  178.798083] ------------[ cut here ]------------
[  178.798089] WARNING: CPU: 2 PID: 429 at fs/dcache.c:274 dentry_free+0x29/0x66()
[  178.798094] Modules linked in: ipmi_watchdog ipmi_msghandler microcode acpi_cpufreq processor
[  178.813557]  ffffffff81213804 ffff88007e8b2180 0000000000000000 ffff88007e8b21d8
[  178.815868] Call Trace:
[  178.816614]  [<ffffffff81a13ec9>] dump_stack+0x4c/0x65
[  178.817584]  [<ffffffff810edd33>] warn_slowpath_common+0xa1/0xbb
[  178.818629]  [<ffffffff81213804>] ? dentry_free+0x29/0x66
[  178.819919]  [<ffffffff810eddf0>] warn_slowpath_null+0x1a/0x1c
[  178.821423]  [<ffffffff81213804>] dentry_free+0x29/0x66
[  178.822541]  [<ffffffff81214458>] __dentry_kill+0x1a6/0x1ae
[  178.823540]  [<ffffffff8121461d>] dput+0x1bd/0x1e7
[  178.824472]  [<ffffffff81209790>] path_put+0x17/0x23
[  178.825411]  [<ffffffff8120e020>] path_openat+0x332/0x63d
[  178.826479]  [<ffffffff8120f039>] do_filp_open+0x3a/0x8a
[  178.827457]  [<ffffffff81219d8b>] ? __alloc_fd+0x5f/0xf6
[  178.828535]  [<ffffffff812009df>] do_sys_open+0x14b/0x1da
[  178.829525]  [<ffffffff81200a8c>] SyS_open+0x1e/0x20
[  178.830459]  [<ffffffff81a1b549>] system_call_fastpath+0x12/0x17
[  178.831494] ---[ end trace ca507ea65ca0f2bf ]---
[  178.831498] CPU: 2 PID: 429 Comm: setquota Not tainted 4.0.0-rc7-00076-gd06842f #1



Thanks,
Ying Huang


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