Public bug reported:
Kernel oops when mounting with cifs.
Mount command: sudo mount -t cifs -o user=myuser //server.com/directory
/mnt/mountpoint
Ubuntu 12.04
Linux image package version 3.2.0-24.39
[ 128.277660] CIFS VFS: default security mechanism requested. The default
security mechanism will be upgraded from ntlm to ntlmv2 in kernel release 3.3
[ 152.814578] BUG: unable to handle kernel NULL pointer dereference at
(null)
[ 152.818553] IP: [< (null)>] (null)
[ 152.818553] PGD 411007067 PUD 414f08067 PMD 0
[ 152.818553] Oops: 0010 [#1] SMP
[ 152.818553] CPU 0
[ 152.818553] Modules linked in: des_generic md4 nls_utf8 cifs ip6table_filter
ip6_tables ebtable_nat ebtables ipt_MASQUERADE iptable_nat nf_nat
nf_conntrack_ipv4 nf_defrag_ipv4 xt_state nf_conntrack ipt_REJECT xt_CHECKSUM
iptable_mangle xt_tcpudp iptable_filter ip_tables x_tables bridge stp kvm_intel
autofs4 kvm ib_iser rdma_cm ib_cm iw_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp
libiscsi_tcp libiscsi scsi_transport_iscsi bnep rfcomm bluetooth parport_pc
ppdev nfsd binfmt_misc nfs lockd fscache auth_rpcgss nfs_acl sunrpc radeon
i5000_edac ttm edac_core i5k_amb drm_kms_helper shpchp drm ioatdma serio_raw
dca i2c_algo_bit dm_multipath mac_hid lp parport mptsas mptscsih mptbase
scsi_transport_sas qla2xxx scsi_transport_fc bnx2 scsi_tgt
[ 152.818553]
[ 152.818553] Pid: 1991, comm: mount.cifs Not tainted 3.2.0-24-generic
#39-Ubuntu IBM IBM eServer BladeCenter HS21 -[8853G4G]-/Server Blade
[ 152.818553] RIP: 0010:[<0000000000000000>] [< (null)>]
(null)
[ 152.818553] RSP: 0018:ffff880412723c60 EFLAGS: 00010286
[ 152.818553] RAX: ffffffffa05d66c0 RBX: ffff880409282000 RCX: 0000000000000000
[ 152.818553] RDX: 0000000000000000 RSI: ffff880409282000 RDI: ffff880400d44850
[ 152.818553] RBP: ffff880412723c98 R08: ffff88042fc16e50 R09: 0000000000000000
[ 152.818553] R10: ffff88041054de10 R11: ffffc90000000000 R12: ffff880400d44850
[ 152.818553] R13: 0000000000000000 R14: 0000000000000000 R15: ffff880400d448f0
[ 152.818553] FS: 00007f121231a700(0000) GS:ffff88042fc00000(0000)
knlGS:0000000000000000
[ 152.818553] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 152.818553] CR2: 0000000000000000 CR3: 0000000408de8000 CR4: 00000000000006f0
[ 152.818553] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 152.818553] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 152.818553] Process mount.cifs (pid: 1991, threadinfo ffff880412722000, task
ffff8804024dade0)
[ 152.818553] Stack:
[ 152.818553] ffffffff811828f5 ffff880412723c98 ffffffff81190035
0000000000000020
[ 152.818553] 0000000000000000 ffff8804092826c0 ffff880412723cf8
ffff880412723cd8
[ 152.818553] ffffffff8118344f ffff880412723cd8 ffffffff8118367a
ffff8804092826c0
[ 152.818553] Call Trace:
[ 152.818553] [<ffffffff811828f5>] ? d_alloc_and_lookup+0x45/0x90
[ 152.818553] [<ffffffff81190035>] ? d_lookup+0x35/0x60
[ 152.818553] [<ffffffff8118344f>] __lookup_hash.part.28+0xbf/0xe0
[ 152.818553] [<ffffffff8118367a>] ? inode_permission+0x4a/0x110
[ 152.818553] [<ffffffff8118394e>] lookup_one_len+0xee/0x120
[ 152.818553] [<ffffffffa05aa851>] cifs_get_root+0x111/0x190 [cifs]
[ 152.818553] [<ffffffffa05aaa6c>] cifs_do_mount+0x19c/0x280 [cifs]
[ 152.818553] [<ffffffff8117b6e3>] mount_fs+0x43/0x1b0
[ 152.818553] [<ffffffff81195f2a>] vfs_kern_mount+0x6a/0xc0
[ 152.818553] [<ffffffff81197434>] do_kern_mount+0x54/0x110
[ 152.818553] [<ffffffff81198f84>] do_mount+0x1a4/0x260
[ 152.818553] [<ffffffff81199460>] sys_mount+0x90/0xe0
[ 152.818553] [<ffffffff81664d82>] system_call_fastpath+0x16/0x1b
[ 152.818553] Code: Bad RIP value.
[ 152.818553] RIP [< (null)>] (null)
[ 152.818553] RSP <ffff880412723c60>
[ 152.818553] CR2: 0000000000000000
[ 153.718929] ---[ end trace 4cf1ea832a5313fc ]---
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete
** Tags: precise
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https://bugs.launchpad.net/bugs/1018852
Title:
cifs causes kernel oops on mount
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