I've been trying with no luck to get the CIFS module work properly in
the 3.10 kernel compiled for ARM under the LG Webos 2.2.
I have an old samba NAS which can be mounted (using CIFS) by any of my
other linux boxes, but my TV running webos 2.2.
When I execute mount.cifs //nas_ip/share_name /mount_point it hangs
for a while (about 2 minutes), after which the command crashes with
seg fault. Dmesg reveals the following:
[ 988.072983] Error -110 connecting to server
[ 988.073011] Alignment trap: not handling instruction e1903f9f at [<80487b3c>]
[ 988.073019] Unhandled fault: alignment exception (0x001) at 0x000004e2
[ 988.073029] Internal error: : 1 [#1] PREEMPT SMP ARM
[ 31.554584]
[DIP INFO] dip open
[ 988.073036] Modules linked in:
[ 988.073042] cifs fscache sha256_generic hmac portal(O) tfat(PO)
tntfs(PO) btusb(O) wl(PO) bcm_dbus(O) mali_kbase(O) ump(O) kds(O)
mhal_alsa_audio(P) mdrv_alsa_audio snd_pcm_oss snd_pcm snd_timer
snd_rawmidi snd_page_alloc snd_mixer_oss snd_hwdep utpa2k(PO)
[ 988.073108] CPU: 1 PID: 3925 Comm: mount.cifs Tainted: P
O 3.10.23-p.21.biscayne.lm15u.10 #1
[ 988.073116] task: 9e960a00 ti: 9eff6000 task.ti: 9eff6000
[ 988.073128] PC is at __sk_free+0xcc/0x148
[ 988.073139] LR is at inet_sock_destruct+0x148/0x1e0
[ 988.073146] pc : [<80487b40>] lr : [<804fe56c>] psr: 20010013
sp : 9eff7d68 ip : 9eff7d48 fp : 9eff7d84
[ 988.073153] r10: 9e93f400 r9 : 00000080 r8 : 00000007
[ 988.073159] r7 : 9cf453cc r6 : 9cf452b8 r5 : 9cf452b0 r4 : 9cf45280
[ 988.073165] r3 : 00000000 r2 : 00004301 r1 : 00000000 r0 : 000004e2
[ 988.073172] Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user
[ 988.073178] Control: 10c5387d Table: 3f0d806a DAC: 00000015
[ 988.073183]
PC: 0x80487ac0:
[ 988.073189] 7ac0 e183cf91 e33c0000 1afffffa f57ff05f e1903f9f
e2433001 e1802f93 e3320000
[ 988.073211] 7ae0 1afffffa f57ff05f e3530000 0a00002a e3a03000
e58430a0 e59420b0 e3a03080
[ 988.073232] 7b00 e3403008 e0033002 e3530000 0a000003 e3c22702
e3c22080 e58420b0 eb002ffe
[ 988.073253] 7b20 e59430d0 e5940170 e3530000 159430d0 e3500000
0a000009 f57ff05f e1903f9f
[ 988.073274] 7b40 e2433001 e1802f93 e3320000 1afffffa f57ff05f
e3530000 1a000000 ebef2ca7
[ 988.073295] 7b60 e594016c ebef0160 e5943148 e1a00004 e5935080
e593609c ebf8c122 e3550000
[ 988.073315] 7b80 0a00000a e1a00005 e1a01004 ebf22de9 e1a00006
ebefeb9c e89da878 e30a1db4
[ 988.073336] 7ba0 e280000c e348104a ebf05252 eaffffcf e1a00004
ebf22d42 eafffff4 e1a0c00d
[ 988.073358]
LR: 0x804fe4ec:
[ 988.073363] e4ec 1afffff0 e5943020 e5933060 e3530000 0a000002
e5943090 e3530a01 aa000021
[ 988.073384] e50c e1d43fb6 e3530001 0a000015 e59430b0 e3130001
0a00001e e5943080 e3530000
[ 988.073404] e52c 1a000020 e59430cc e3530000 1a000022 e59430f8
e3530000 1a000024 e5943090
[ 988.073425] e54c e3530000 1a000026 e5940200 ebf052d9 e59400b8
ebfe89b8 e59400b4 ebfe89b6
[ 988.073446] e56c e89da878 e5d43012 e3530007 0affffe6 e30c0cd8
e5d41012 e1a02004 e3480076
[ 988.073467] e58c eb03139b e89da878 e1a00004 ebfe2021 eaffffda
e30c0d10 e1a01004 e3480076
[ 988.073487] e5ac eb031393 e89da878 e30c0d44 e3a010a6 e3480076
ebeca1e4 eaffffd9 e30c0d44
[ 988.073508] e5cc e3a010a7 e3480076 ebeca1df eaffffd7 e30c0d44
e3a010a8 e3480076 ebeca1da
[ 988.073530]
SP: 0x9eff7ce8:
[ 988.073535] 7ce8 800c7308 80057fb0 80807340 80487b3c 20010013
80487b3c 20010013 ffffffff
[ 988.073555] 7d08 9eff7d54 00000007 9eff7d84 9eff7d20 8000e81c
800083cc 000004e2 00000000
[ 988.073576] 7d28 00004301 00000000 9cf45280 9cf452b0 9cf452b8
9cf453cc 00000007 00000080
[ 988.073597] 7d48 9e93f400 9eff7d84 9eff7d48 9eff7d68 804fe56c
80487b40 20010013 ffffffff
[ 988.073618] 7d68 9cf4534c 9cf45280 9cf452b0 9cf452b8 9eff7d94
9eff7d88 80487bfc 80487a80
[ 988.073638] 7d88 9eff7dc4 9eff7d98 804db8ec 80487bc8 00000020
9e93f400 ffffff92 9cf45280
[ 988.073659] 7da8 a30a0e00 00000010 0000bd01 9f3ba600 9eff7ddc
9eff7dc8 804febf0 804db768
[ 988.073679] 7dc8 a30a0e00 00000000 9eff7df4 9eff7de0 80482e6c
804feb74 9e93f400 ffffff92
[ 988.073701]
IP: 0x9eff7cc8:
[ 988.073706] 7cc8 0000002f 805cabc0 9eff6000 81d9d340 00000001
800c7308 9eff7d04 9eff7cf0
[ 988.073727] 7ce8 800c7308 80057fb0 80807340 80487b3c 20010013
80487b3c 20010013 ffffffff
[ 988.073747] 7d08 9eff7d54 00000007 9eff7d84 9eff7d20 8000e81c
800083cc 000004e2 00000000
[ 988.073768] 7d28 00004301 00000000 9cf45280 9cf452b0 9cf452b8
9cf453cc 00000007 00000080
[ 988.073789] 7d48 9e93f400 9eff7d84 9eff7d48 9eff7d68 804fe56c
80487b40 20010013 ffffffff
[ 988.073809] 7d68 9cf4534c 9cf45280 9cf452b0 9cf452b8 9eff7d94
9eff7d88 80487bfc 80487a80
[ 988.073830] 7d88 9eff7dc4 9eff7d98 804db8ec 80487bc8 00000020
9e93f400 ffffff92 9cf45280
[ 988.073851] 7da8 a30a0e00 00000010 0000bd01 9f3ba600 9eff7ddc
9eff7dc8 804febf0 804db768
[ 988.073872]
FP: 0x9eff7d04:
[ 988.073877] 7d04 ffffffff 9eff7d54 00000007 9eff7d84 9eff7d20
8000e81c 800083cc 000004e2
[ 988.073898] 7d24 00000000 00004301 00000000 9cf45280 9cf452b0
9cf452b8 9cf453cc 00000007
[ 988.073918] 7d44 00000080 9e93f400 9eff7d84 9eff7d48 9eff7d68
804fe56c 80487b40 20010013
[ 988.073939] 7d64 ffffffff 9cf4534c 9cf45280 9cf452b0 9cf452b8
9eff7d94 9eff7d88 80487bfc
[ 988.073960] 7d84 80487a80 9eff7dc4 9eff7d98 804db8ec 80487bc8
00000020 9e93f400 ffffff92
[ 988.073980] 7da4 9cf45280 a30a0e00 00000010 0000bd01 9f3ba600
9eff7ddc 9eff7dc8 804febf0
[ 988.074001] 7dc4 804db768 a30a0e00 00000000 9eff7df4 9eff7de0
80482e6c 804feb74 9e93f400
[ 988.074022] 7de4 ffffff92 9eff7e24 9eff7df8 7fb997e8 80482e48
9eff7e00 00000001 a30a0e00
[ 988.074043]
R4: 0x9cf45200:
[ 988.074048] 5200 00000000 00000000 00000000 00000000 00000008
32574385 0000f9b3 00003908
[ 988.074069] 5220 32570f67 0000f9c4 00000000 00000000 00000000
00000000 00000000 00000000
[ 988.074089] 5240 9cf44200 00000000 00000000 000001c5 00000000
1b000000 1cf35ce9 1fffe748
[ 988.074110] 5260 00001fff 00000000 00000000 00000000 00000000
00000000 00000000 00000000
[ 988.074130] 5280 0102a8c0 6702a8c0 c609a2a2 00000000 00070002
00000000 00000000 a15c6974
[ 988.074151] 52a0 8088e8fc 00000545 00000000 ffffffff 00000000
00000000 000e000e dead4ead
[ 988.074171] 52c0 ffffffff ffffffff 00000000 00000000 dead4ead
ffffffff ffffffff 9cf452dc
[ 988.074192] 52e0 9cf452dc 9cf452e4 9cf452e4 00000000 00000000
dead4ead ffffffff ffffffff
[ 988.074213]
R5: 0x9cf45230:
[ 988.074218] 5230 00000000 00000000 00000000 00000000 9cf44200
00000000 00000000 000001c5
[ 988.074239] 5250 00000000 1b000000 1cf35ce9 1fffe748 00001fff
00000000 00000000 00000000
[ 988.074259] 5270 00000000 00000000 00000000 00000000 0102a8c0
6702a8c0 c609a2a2 00000000
[ 988.074279] 5290 00070002 00000000 00000000 a15c6974 8088e8fc
00000545 00000000 ffffffff
[ 988.074300] 52b0 00000000 00000000 000e000e dead4ead ffffffff
ffffffff 00000000 00000000
[ 988.074320] 52d0 dead4ead ffffffff ffffffff 9cf452dc 9cf452dc
9cf452e4 9cf452e4 00000000
[ 988.074341] 52f0 00000000 dead4ead ffffffff ffffffff 00000000
00000000 00000000 00000000
[ 988.074361] 5310 00000000 00000000 00000000 00015554 00000000
00000000 00000000 00000000
[ 988.074382]
R6: 0x9cf45238:
[ 988.074387] 5238 00000000 00000000 9cf44200 00000000 00000000
000001c5 00000000 1b000000
[ 988.074408] 5258 1cf35ce9 1fffe748 00001fff 00000000 00000000
00000000 00000000 00000000
[ 988.074428] 5278 00000000 00000000 0102a8c0 6702a8c0 c609a2a2
00000000 00070002 00000000
[ 988.074448] 5298 00000000 a15c6974 8088e8fc 00000545 00000000
ffffffff 00000000 00000000
[ 988.074469] 52b8 000e000e dead4ead ffffffff ffffffff 00000000
00000000 dead4ead ffffffff
[ 988.074490] 52d8 ffffffff 9cf452dc 9cf452dc 9cf452e4 9cf452e4
00000000 00000000 dead4ead
[ 988.074510] 52f8 ffffffff ffffffff 00000000 00000000 00000000
00000000 00000000 00000000
[ 988.074530] 5318 00000000 00015554 00000000 00000000 00000000
00000000 00004301 00000000
[ 988.074551]
R7: 0x9cf4534c:
[ 988.074556] 534c 00000000 00000000 00004000 9cf45358 9cf45358
00000000 00000000 dead4ead
[ 988.074577] 536c ffffffff ffffffff 00000053 00000000 000000d0
ffffffff 00000000 00004000
[ 988.074597] 538c 00000000 00000000 00000000 00000001 00000000
00000000 00000001 00000000
[ 988.074617] 53ac 9cf453ac 9cf453ac 00000000 00000000 dead4ead
ffffffff ffffffff 8088e8fc
[ 988.074638] 53cc 00000000 deaf1eed ffffffff ffffffff 00000000
00000000 00000000 00000000
[ 988.074658] 53ec 000006d6 000004e2 7fffffff 7fffffff 00000000
00000000 00000000 00000000
[ 988.074679] 540c a3612000 804e957c 9cf45280 ffffffff 00000000
c4653600 ffffffff 00000000
[ 988.074699] 542c 00000000 00000000 00000000 00000000 ffffffff
00000000 00000000 00000000
[ 988.074720]
R10: 0x9e93f380:
[ 988.074725] f380 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000
[ 988.074745] f3a0 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000
[ 988.074765] f3c0 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000
[ 988.074786] f3e0 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000
[ 988.074806] f400 9e93f400 9e93f400 9e93f408 9e93f408 00000001
00000000 00000000 00000000
[ 988.074826] f420 00000000 7fbdee20 7fbdede4 00000000 9c158a40
a30a0e00 bd010002 0102a8c0
[ 988.074847] f440 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000
[ 988.074867] f460 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000
[ 988.074889] Process mount.cifs (pid: 3925, stack limit = 0x9eff6238)
[ 988.074895] Stack: (0x9eff7d68 to 0x9eff8000)
[ 988.074903] 7d60: 9cf4534c 9cf45280 9cf452b0
9cf452b8 9eff7d94 9eff7d88
[ 988.074912] 7d80: 80487bfc 80487a80 9eff7dc4 9eff7d98 804db8ec
80487bc8 00000020 9e93f400
[ 988.074920] 7da0: ffffff92 9cf45280 a30a0e00 00000010 0000bd01
9f3ba600 9eff7ddc 9eff7dc8
[ 988.074928] 7dc0: 804febf0 804db768 a30a0e00 00000000 9eff7df4
9eff7de0 80482e6c 804feb74
[ 988.074936] 7de0: 9e93f400 ffffff92 9eff7e24 9eff7df8 7fb997e8
80482e48 9eff7e00 00000001
[ 988.074944] 7e00: a30a0e00 7fb9d6d4 9e93f43a 00000000 9e93f048
9e93f000 9eff7e64 9eff7e28
[ 988.074952] 7e20: 7fb9d740 7fb99610 9ee4d000 9e93f648 9e93f400
00000000 7fb9b318 9d940e00
[ 988.074960] 7e40: 9f3ba600 9e93f000 9ee4d000 00000000 9f193000
7fbde844 9eff7eb4 9eff7e68
[ 988.074968] 7e60: 7fb8dcb4 7fb9d418 802e38e4 800dccf0 80d5a260
00000000 9ee4d000 9d940e00
[ 988.074977] 7e80: 7fbde844 9ee4d000 9eff7ea4 00000000 9ee4d000
9d940e00 7fbde844 9ee4d000
[ 988.074985] 7ea0: 9f193000 00000000 9eff7eec 9eff7eb8 80126028
7fb8dc18 9eff7eec 9eff7ec8
[ 988.074993] 7ec0: 8013f238 9c18c0c0 9d940e00 00000000 7fbde844
9ee4d000 9d940e80 00000000
[ 988.075001] 7ee0: 9eff7f14 9eff7ef0 8013f3b4 80125fe0 9ee4d000
7fbde844 8082da60 9ee4d000
[ 988.075009] 7f00: 9d940e00 00000000 9eff7f6c 9eff7f18 80141934
8013f368 9ee4d000 7e7447d8
[ 988.075017] 7f20: 00000000 00000020 9cedb790 a04ceed8 800dccf0
800f62ec 9eff7f6c 9eff7f48
[ 988.075025] 7f40: 80141618 00000000 9f2d1000 7e7447d8 00000000
8000ef84 9eff6000 00000000
[ 988.075033] 7f60: 9eff7fa4 9eff7f70 80142100 80141754 9ee4d000
00000000 00000015 9d940e80
[ 988.075041] 7f80: 9d940e00 9ee4d000 76d77010 76d6c73c 00000000
00000015 00000000 9eff7fa8
[ 988.075049] 7fa0: 8000ed00 80142078 76d77010 76d6c73c 7e7447d8
76d6c634 76d6c73c 00000000
[ 988.075057] 7fc0: 76d77010 76d6c73c 00000000 00000015 76d77010
76d76008 00000000 76d5f90b
[ 988.075065] 7fe0: 76d74fcc 7e744420 76d6a6b0 76cb1450 60000010
7e7447d8 48544150 4e4f435f
[ 988.075069] Backtrace:
[ 988.075081] [<80487a74>] (__sk_free+0x0/0x148) from [<80487bfc>]
(sk_free+0x40/0x44)
[ 988.075087] r6:9cf452b8 r5:9cf452b0 r4:9cf45280 r3:9cf4534c
[ 988.075108] [<80487bbc>] (sk_free+0x0/0x44) from [<804db8ec>]
(tcp_close+0x190/0x490)
[ 988.075119] [<804db75c>] (tcp_close+0x0/0x490) from [<804febf0>]
(inet_release+0x88/0xb4)
[ 988.075124] r8:9f3ba600 r7:0000bd01 r6:00000010 r5:a30a0e00 r4:9cf45280
[ 988.075147] [<804feb68>] (inet_release+0x0/0xb4) from [<80482e6c>]
(sock_release+0x30/0xb0)
[ 988.075152] r5:00000000 r4:a30a0e00
[ 988.075200] [<80482e3c>] (sock_release+0x0/0xb0) from [<7fb997e8>]
(generic_ip_connect+0x1e4/0x2fc [cifs])
[ 988.075205] r5:ffffff92 r4:9e93f400
[ 988.075255] [<7fb99604>] (generic_ip_connect+0x0/0x2fc [cifs]) from
[<7fb9d740>] (cifs_mount+0x334/0x784 [cifs])
[ 988.075260] r7:9e93f000 r6:9e93f048 r5:00000000 r4:9e93f43a
[ 988.075307] [<7fb9d40c>] (cifs_mount+0x0/0x784 [cifs]) from
[<7fb8dcb4>] (cifs_do_mount+0xa8/0x454 [cifs])
[ 988.075332] [<7fb8dc0c>] (cifs_do_mount+0x0/0x454 [cifs]) from
[<80126028>] (mount_fs+0x54/0x194)
[ 988.075345] [<80125fd4>] (mount_fs+0x0/0x194) from [<8013f3b4>]
(vfs_kern_mount+0x58/0xd8)
[ 988.075356] [<8013f35c>] (vfs_kern_mount+0x0/0xd8) from
[<80141934>] (do_mount+0x1ec/0x924)
[ 988.075360] r8:00000000 r7:9d940e00 r6:9ee4d000 r5:8082da60 r4:7fbde844
r3:9ee4d000
[ 988.075383] [<80141748>] (do_mount+0x0/0x924) from [<80142100>]
(SyS_mount+0x94/0xc8)
[ 988.075397] [<8014206c>] (SyS_mount+0x0/0xc8) from [<8000ed00>]
(ret_fast_syscall+0x0/0x48)
[ 988.075402] r7:00000015 r6:00000000 r5:76d6c73c r4:76d77010
[ 988.075418] Code: e3500000 0a000009 f57ff05f e1903f9f (e2433001)
[ 988.075453] ---[ end trace 634f6b4ee6025b11 ]---
I've traced the problem in the CIFS module, file
kernel/fs/cifs/connect.c function generic_ip_connect. The crash
happens in sock_release() after a timeout trying to connect to the NAS
via a server socket. Th code snippet is this:
rc = socket->ops->connect(socket, saddr, slen, 0);
if (rc < 0) {
cifs_dbg(FYI, "Error %d connecting to server\n", rc);
sock_release(socket);
server->ssocket = NULL;
return rc;
}
The error is 110 (timeout error) and the crash appears to be inside
the sock_release function due to alignment exception.
It seems to me hard to believe that there is a bug inside
sock_release(). I suspect more that maybe there is a mismatch between
the original kernel configuration and my own. Or maybe gcc compile
flags....
Anyways I've already tried the following:
- use a different arm toolchain. Result was identical.
- use a slightly different version of the cifs module (copied from a
3.9 kernel source code tree). Same result.
What else can I try ? Anyone can help with this ? I'm not even sure if
this is the appropriate forum to ask such questions. Anyhow, any help
appreciated !
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