linux-kernel - [lkp] [namei] fda89e6574: kernel BUG at fs/namei.c:679!

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Date:	Mon, 14 Mar 2016 08:48:26 +0800
From:	kernel test robot <ying.huang@...ux.intel.com>
TO:	Al Viro <viro@...iv.linux.org.uk>
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: [lkp] [namei] fda89e6574: kernel BUG at fs/namei.c:679!

FYI, we noticed the below changes on

https://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs.git work.lookups
commit fda89e65743179d09e55bc6c265d06fa5efa8803 ("namei: untanlge lookup_fast()")


+------------------------------------------+------------+------------+
|                                          | 6c51e513a3 | fda89e6574 |
+------------------------------------------+------------+------------+
| boot_successes                           | 0          | 1          |
| boot_failures                            | 1          | 4          |
| invoked_oom-killer:gfp_mask=0x           | 1          | 1          |
| Mem-Info                                 | 1          | 1          |
| Out_of_memory:Kill_process               | 1          | 1          |
| kernel_BUG_at_fs/namei.c                 | 0          | 3          |
| invalid_opcode:#[##]SMP                  | 0          | 3          |
| RIP:unlazy_walk                          | 0          | 3          |
| Kernel_panic-not_syncing:Fatal_exception | 0          | 3          |
| backtrace:SYSC_newfstatat                | 0          | 3          |
| backtrace:SyS_newfstatat                 | 0          | 3          |
+------------------------------------------+------------+------------+



[   19.082726] gre: GRE over IPv4 demultiplexor driver
[   19.084132] PPTP driver version 0.8.5
[   19.622035] ------------[ cut here ]------------
[   19.623051] kernel BUG at fs/namei.c:679!
[   19.624142] invalid opcode: 0000 [#1] SMP 
[   19.625196] Modules linked in: pptp gre nfnetlink scsi_transport_iscsi pppoe inet_diag crypto_user sctp vmw_vsock_vmci_transport vsock vmw_vmci ieee802154_socket ieee802154 pppox ppp_generic slhc atm rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver sg sr_mod cdrom ata_generic pata_acpi snd_pcm ppdev snd_timer snd soundcore pcspkr serio_raw ata_piix parport_pc parport floppy acpi_cpufreq libata i2c_piix4
[   19.634478] CPU: 2 PID: 471 Comm: trinity-main Not tainted 4.5.0-rc4-00017-gfda89e6 #1
[   19.636222] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[   19.638068] task: ffff88007e49a440 ti: ffff88007ecfc000 task.ti: ffff88007ecfc000
[   19.639728] RIP: 0010:[<ffffffff811fc7c1>]  [<ffffffff811fc7c1>] unlazy_walk+0x151/0x170
[   19.641705] RSP: 0018:ffff88007ecffc30  EFLAGS: 00010246
[   19.643337] RAX: 0000000000001000 RBX: ffff88007ecffd40 RCX: ffff88007ecffcc4
[   19.644713] RDX: 0000000000000002 RSI: ffff8800a486a240 RDI: ffff88007ecffd40
[   19.646082] RBP: ffff88007ecffc58 R08: 0000000000000001 R09: 0000000000200000
[   19.647451] R10: ffffffffffffffff R11: 0000000b5ae0aec3 R12: ffff8800a486a240
[   19.648820] R13: ffff8800a486a480 R14: ffff88007ecffcc8 R15: ffff88013a53aaa0
[   19.650323] FS:  00007f1ba2185700(0000) GS:ffff88013fd00000(0000) knlGS:0000000000000000
[   19.652545] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   19.654211] CR2: 000000000239b000 CR3: 000000007f654000 CR4: 00000000000006e0
[   19.656138] Stack:
[   19.657186]  ffff88007ecffd40 ffff8800a486a240 ffff88007ecffcd0 ffff88007ecffcc8
[   19.660359]  ffff88013a53aaa0 ffff88007ecffcb0 ffffffff811fc937 ffff88007ecffcc4
[   19.663448]  ffff88007ecffcc4 ffff88007ecffcc4 0000000280808080 ffff88007ecffd40
[   19.666064] Call Trace:
[   19.666835]  [<ffffffff811fc937>] lookup_fast+0x157/0x330
[   19.667898]  [<ffffffff811fd3aa>] walk_component+0x3a/0x410
[   19.668968]  [<ffffffff811fe1fd>] path_lookupat+0x5d/0x110
[   19.670047]  [<ffffffff8120176e>] filename_lookup+0x9e/0x150
[   19.671163]  [<ffffffff8109d479>] ? __might_sleep+0x49/0x80
[   19.672276]  [<ffffffff812013b6>] ? getname_flags+0x56/0x1f0
[   19.673370]  [<ffffffff811ce84e>] ? kmem_cache_alloc+0x18e/0x1f0
[   19.674545]  [<ffffffff812013b6>] ? getname_flags+0x56/0x1f0
[   19.675665]  [<ffffffff812013d2>] ? getname_flags+0x72/0x1f0
[   19.676755]  [<ffffffff812018d6>] user_path_at_empty+0x36/0x40
[   19.677859]  [<ffffffff811f6a33>] vfs_fstatat+0x53/0xa0
[   19.678902]  [<ffffffff811f6f55>] SYSC_newfstatat+0x15/0x30
[   19.679998]  [<ffffffff811f716e>] SyS_newfstatat+0xe/0x10
[   19.681087]  [<ffffffff818daf6e>] entry_SYSCALL_64_fastpath+0x12/0x6d
[   19.682253] Code: 00 41 8b 7e 40 49 8d 76 20 e8 6c fe ff ff 84 c0 75 ba 48 89 df 65 ff 0d a6 f5 e0 7e e8 69 cb 00 00 b8 f6 ff ff ff e9 53 ff ff ff <0f> 0b 48 89 df 65 ff 0d 8b f5 e0 7e e8 4e cb 00 00 e9 29 ff ff 
[   19.690108] RIP  [<ffffffff811fc7c1>] unlazy_walk+0x151/0x170
[   19.691269]  RSP <ffff88007ecffc30>
[   19.692149] ---[ end trace 563d316f4eb96ab1 ]---
[   19.693134] Kernel panic - not syncing: Fatal exception


To reproduce:

        git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
        cd lkp-tests
        bin/lkp install job.yaml  # job file is attached in this email
        bin/lkp run     job.yaml



Thanks,
Kernel Test Robot

View attachment "config-4.5.0-rc4-00017-gfda89e6" of type "text/plain" (145419 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (13708 bytes)

View attachment "job.yaml" of type "text/plain" (2746 bytes)