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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
View attachment "config-4.0.0-rc7-00072-gbaadac3" of type "text/plain" (86802 bytes)
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