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Message-ID: <1422494319.24875.56.camel@intel.com>
Date: Thu, 29 Jan 2015 09:18:39 +0800
From: Huang Ying <ying.huang@...el.com>
To: David Howells <dhowells@...hat.com>
Cc: LKML <linux-kernel@...r.kernel.org>, LKP ML <lkp@...org>
Subject: [LKP] [VFS] BUG: unable to handle kernel NULL pointer dereference
at (null)
FYI, we noticed the below changes on
git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs file-pin
commit 1bdc0d05755a7b261658f4d7b9d5e5a66773fa72 ("VFS: Split DCACHE_FILE_TYPE into regular and special types")
+----------------------------------------------------------------------------+------------+------------+
| | d0d43c410c | 1bdc0d0575 |
+----------------------------------------------------------------------------+------------+------------+
| boot_successes | 19 | 0 |
| boot_failures | 11 | 30 |
| Kernel_panic-not_syncing:VFS:Unable_to_mount_root_fs_on_unknown-block(#,#) | 1 | |
| backtrace:prepare_namespace | 1 | |
| backtrace:kernel_init_freeable | 1 | 30 |
| Out_of_memory:Kill_process | 10 | |
| Kernel_panic-not_syncing:Out_of_memory_and_no_killable_processes | 8 | |
| backtrace:vfs_mknod | 2 | |
| backtrace:SyS_mknodat | 2 | |
| backtrace:SyS_mknod | 2 | |
| backtrace:do_fork | 10 | |
| backtrace:__call_usermodehelper | 8 | |
| backtrace:do_execveat_common | 6 | |
| backtrace:compat_SyS_execve | 6 | |
| backtrace:SyS_clone | 8 | |
| backtrace:link_path_walk | 3 | |
| backtrace:path_init | 3 | |
| backtrace:pgd_alloc | 2 | |
| backtrace:mm_init | 2 | |
| BUG:unable_to_handle_kernel | 0 | 30 |
| Oops | 0 | 30 |
| Kernel_panic-not_syncing:Fatal_exception | 0 | 30 |
| backtrace:user_path_at | 0 | 30 |
| backtrace:SyS_fchownat | 0 | 30 |
| backtrace:SyS_chown | 0 | 30 |
| backtrace:populate_rootfs | 0 | 30 |
+----------------------------------------------------------------------------+------------+------------+
[ 1.697632] pci 0000:00:01.0: Activating ISA DMA hang workarounds
[ 1.699483] pci 0000:00:02.0: Video device with shadowed ROM
[ 1.701265] PCI: CLS 0 bytes, default 64
[ 1.704035] BUG: unable to handle kernel NULL pointer dereference at (null)
[ 1.704562] IP: [< (null)>] (null)
[ 1.704562] PGD 0
[ 1.704562] Oops: 0010 [#1] SMP
[ 1.704562] Modules linked in:
[ 1.704562] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.19.0-rc6-gb6c48b1 #1457
[ 1.704562] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140531_083030-gandalf 04/01/2014
[ 1.704562] task: ffff880006400000 ti: ffff880006408000 task.ti: ffff880006408000
[ 1.704562] RIP: 0010:[<0000000000000000>] [< (null)>] (null)
[ 1.704562] RSP: 0000:ffff88000640baf0 EFLAGS: 00010246
[ 1.704562] RAX: ffffffff83440080 RBX: ffff88000640bbe8 RCX: 0000000000800000
[ 1.704562] RDX: 000000001bfd6df1 RSI: ffff88000640bbe8 RDI: ffff8800053db9a0
[ 1.704562] RBP: ffff88000640bb88 R08: 0000000000000004 R09: 0000000000000001
[ 1.704562] R10: ffff88000640bab4 R11: 0000000000000000 R12: ffff8800053db9a0
[ 1.704562] R13: ffff88000640bbe8 R14: 0000000000000001 R15: ffff880006400000
[ 1.704562] FS: 0000000000000000(0000) GS:ffff880007a00000(0000) knlGS:0000000000000000
[ 1.704562] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 1.704562] CR2: 0000000000000000 CR3: 0000000002189000 CR4: 00000000000006f0
[ 1.704562] Stack:
[ 1.704562] ffffffff811aff40 0000000000000246 0000000000000246 ffff88000640bb38
[ 1.704562] ffff880006400000 ffff880006400000 ffff880006400000 ffff880006dcc000
[ 1.704562] 0000000000000000 ffff880006f06020 ffff8800053db9a0 ffff880006f06020
[ 1.704562] Call Trace:
[ 1.704562] [<ffffffff811aff40>] ? path_lookupat+0x2e4/0x657
[ 1.704562] [<ffffffff811b02dd>] filename_lookup+0x2a/0x9c
[ 1.704562] [<ffffffff811b18fb>] user_path_at_empty+0x5a/0x98
[ 1.704562] [<ffffffff810aa827>] ? local_clock+0x19/0x22
[ 1.704562] [<ffffffff811bf1cd>] ? mntput_no_expire+0x63/0x1db
[ 1.704562] [<ffffffff811bf372>] ? mntput+0x2d/0x2f
[ 1.704562] [<ffffffff811ab800>] ? path_put+0x1f/0x23
[ 1.704562] [<ffffffff811b194a>] user_path_at+0x11/0x13
[ 1.704562] [<ffffffff811a23b8>] SyS_fchownat+0x60/0xc5
[ 1.704562] [<ffffffff824deb06>] ? md_run_setup+0x9c/0x9c
[ 1.704562] [<ffffffff811a243a>] SyS_chown+0x1d/0x1f
[ 1.704562] [<ffffffff824dfaf2>] do_name+0x244/0x27f
[ 1.704562] [<ffffffff824dec3c>] write_buffer+0x24/0x36
[ 1.704562] [<ffffffff824dec7a>] flush_buffer+0x2c/0x87
[ 1.704562] [<ffffffff8251fe13>] gunzip+0x261/0x2fb
[ 1.704562] [<ffffffff8251fba8>] ? decompress_method+0x58/0x58
[ 1.704562] [<ffffffff824dec4e>] ? write_buffer+0x36/0x36
[ 1.704562] [<ffffffff824df6aa>] unpack_to_rootfs+0x149/0x247
[ 1.704562] [<ffffffff824deb06>] ? md_run_setup+0x9c/0x9c
[ 1.704562] [<ffffffff810002bd>] ? do_one_initcall+0x90/0x17f
[ 1.704562] [<ffffffff824df7a8>] ? unpack_to_rootfs+0x247/0x247
[ 1.704562] [<ffffffff824df7c1>] populate_rootfs+0x19/0x106
[ 1.704562] [<ffffffff8100031a>] do_one_initcall+0xed/0x17f
[ 1.704562] [<ffffffff824dd0e2>] kernel_init_freeable+0x1f0/0x278
[ 1.704562] [<ffffffff81b6bad8>] ? rest_init+0xca/0xca
[ 1.704562] [<ffffffff81b6bae6>] kernel_init+0xe/0xda
[ 1.704562] [<ffffffff81b881fc>] ret_from_fork+0x7c/0xb0
[ 1.704562] [<ffffffff81b6bad8>] ? rest_init+0xca/0xca
[ 1.704562] Code: Bad RIP value.
[ 1.704562] RIP [< (null)>] (null)
[ 1.704562] RSP <ffff88000640baf0>
[ 1.704562] CR2: 0000000000000000
[ 1.704562] ---[ end trace ca633ac8ec2a95d9 ]---
[ 1.704562] Kernel panic - not syncing: Fatal exception
Thanks,
Huang, Ying
View attachment "config-3.19.0-rc3-g1bdc0d0" of type "text/plain" (101718 bytes)
View attachment ".dmesg" of type "text/plain" (43369 bytes)
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