* Bug in _und_usr on dual-core ARM?
@ 2011-06-21 8:31 ` TAO HU
0 siblings, 0 replies; 10+ messages in thread
From: TAO HU @ 2011-06-21 8:31 UTC (permalink / raw)
To: linux-arm-kernel; +Cc: linux-omap, Zhou Ming-a17711
Hi, All
We got an issue on our OMAP4 SMP system.
Looks like __und_user(), which was triggered by a user space
exception, got a page fault hence lead to might_sleep() failure.
Is it an race condition for dual-core system?
E.g. CPU0 exception->CPU0 __und_user()->CPU1 change MMU->CPU0 data abort
Any suggestions?
<3>[ 5655.430236] BUG: sleeping function called from invalid context
at arch/arm/mm/fault.c:295
<3>[ 5655.449554] in_atomic(): 0, irqs_disabled(): 128, pid: 189, name: aplogd
<4>[ 5655.456573] [<c005c65c>] (unwind_backtrace+0x0/0x164) from
[<c00a1a48>] (__might_sleep+0x11c/0x148)
<4>[ 5655.466033] [<c00a1a48>] (__might_sleep+0x11c/0x148) from
[<c065a654>] (do_page_fault+0x130/0x378)
<4>[ 5655.475372] [<c065a654>] (do_page_fault+0x130/0x378) from
[<c0056488>] (do_DataAbort+0x34/0xb4)
<4>[ 5655.484466] [<c0056488>] (do_DataAbort+0x34/0xb4) from
[<c065876c>] (__dabt_svc+0x4c/0x60)
<4>[ 5655.493103] Exception stack(0xdbad7f68 to 0xdbad7fb0)
<4>[ 5655.498382] 7f60: 10c53c7d afd4b2f0 afd0ce60
00000010 afd0ce5c 0f000000
<4>[ 5655.506927] 7f80: 0000000f 00000000 40005b04 c0658c60 40005b00
0000c8e4 00000065 dbad7fb0
<4>[ 5655.515472] 7fa0: c0658c04 c0658ae0 40000093 ffffffff
<4>[ 5655.520751] [<c065876c>] (__dabt_svc+0x4c/0x60) from
[<c0658ae0>] (__und_usr+0x40/0x6c)
<1>[ 5655.529113] Unable to handle kernel NULL pointer dereference at
virtual address 00000000
<1>[ 5655.537567] pgd = db304000
<1>[ 5655.540374] [00000000] *pgd=9b318031, *pte=00000000, *ppte=00000000
<0>[ 5655.546936] Internal error: Oops: 817 [#1] PREEMPT SMP
<0>[ 5655.552307] last sysfs file:
/sys/devices/virtual/net/ppp0/statistics/rx_packets
... ...
<4>[ 5655.575286] CPU: 0 Tainted: G WC (2.6.35.7-eng-gfa3c8e3 #1)
<4>[ 5655.582183] PC is at __might_sleep+0x120/0x148
<4>[ 5655.586822] LR is at unwind_frame+0xe0/0x5e0
<4>[ 5655.591278] pc : [<c00a1a4c>] lr : [<c005c15c>] psr: a0000193
<4>[ 5655.591278] sp : dbad7e30 ip : 00000008 fp : dbad7e3c
<4>[ 5655.603271] r10: dad0d58c r9 : 00000017 r8 : dad0d558
<4>[ 5655.608734] r7 : db3df4c0 r6 : afd0ce5c r5 : 00000000 r4 : dbad7f68
<4>[ 5655.615539] r3 : 00000000 r2 : dbad7fb0 r1 : 00000001 r0 : c0658ae0
<4>[ 5655.622344] Flags: NzCv IRQs off FIQs on Mode SVC_32 ISA ARM
Segment user
<4>[ 5655.629913] Control: 10c53c7d Table: 9b30404a DAC: 00000015
<4>[ 5655.635894]
<4>[ 5655.635894] PC: 0xc00a19cc:
<4>[ 5655.640350] 19cc e3520000 1a00001f e59f308c e1a0200c e1a01000
e59f0084 e593c000 e59f3074
<4>[ 5655.648956] 19ec e583c030 eb16cc06 e1a0200d e3c23d7f e3c3303f
e593200c e5931004 e5922014
<4>[ 5655.657531] 1a0c e3c11101 e1e02002 e1a02fa2 e0511002 13a01001
e10f2000 e593300c e2022080
<4>[ 5655.666137] 1a2c e59f003c e283cfbd e58dc000 e59331f4 eb16cbf3
e10f3000 eb16cb92 e3a03000
<4>[ 5655.674743] 1a4c e5833000 eafffffd e24bd004 e8bd8800 c09900e4
c098d368 c098f360 c08d0080
<4>[ 5655.683319] 1a6c c07bbbfc c07bbc3c e92d4830 e1a04001 e28db00c
e1a05000 e10f3000 e2133080
<4>[ 5655.691925] 1a8c 1a000001 e5833000 eafffffd e1500001 0a000006
2a000002 eb16d9fb e1a00004
<4>[ 5655.700500] 1aac ea000002 e1a00001 eb16d9f7 e1a00005 e8bd4830
ea16d9f4 e92d4bf0 e59f7060
<4>[ 5655.709106]
<4>[ 5655.709106] LR: 0xc005c0dc:
<4>[ 5655.713562] c0dc e5d3305f e3530000 1a000124 e594000c eb01c075
e3500000 0a00011d e59f3508
<4>[ 5655.722137] c0fc e3a01502 e594500c e1c360d0 e0073001 e3530000
0a000009 e59f34f0 e3a01002
<4>[ 5655.730743] c11c e1c360d0 e0073001 e3530000 0a000003 e59f34dc
e5d33077 e3530000 1a000116
<4>[ 5655.739318] c13c e1a00005 eb01c02c e3500000 0a000005 e1a00005
e59f14bc e59f24bc ebfffee2
<4>[ 5655.747924] c15c e1a05000 ea00001c e59f04b0 eb17f024 e59f34ac
e1a01003 e5933000 e1a06000
<4>[ 5655.756500] c17c ea00000d e5930010 e1550000 3a000009 e5930014
e1550000 2a000006 e593200c
<4>[ 5655.765106] c19c e1a00005 e5931008 e2422008 ebfffece e1a05000
ea000005 e1a03002 e5932000
<4>[ 5655.773681] c1bc f5d2f000 e1530001 1affffed e3a05000 e1a01006
e59f0444 eb17eefd e59f3428
<4>[ 5655.782287]
<4>[ 5655.782287] SP: 0xdbad7db0:
<4>[ 5655.786743] 7db0 c0658c60 40005b00 0000c8e4 00000065 dbad7fb0
c0658c04 00000000 c08c937c
<4>[ 5655.795318] 7dd0 ffffffff dbad7e1c afd0ce5c db3df4c0 dad0d558
c065876c c0658ae0 00000001
<4>[ 5655.803924] 7df0 dbad7fb0 00000000 dbad7f68 00000000 afd0ce5c
db3df4c0 dad0d558 00000017
<4>[ 5655.812500] 7e10 dad0d58c dbad7e3c 00000008 dbad7e30 c005c15c
c00a1a4c a0000193 ffffffff
<4>[ 5655.821105] 7e30 db3df7b4 00000000 0000c8e4 c065a654 00000073
00000000 00000000 00000000
<4>[ 5655.829681] 7e50 c098d6e0 c0056488 00080000 c0062c74 00000073
00000073 00080000 c0062fe0
<4>[ 5655.838256] 7e70 c08d3a80 00000073 c08d3abc c00f6b80 00000073
00000000 dbad7f14 c00ba5f4
<4>[ 5655.846862] 7e90 00000073 c0056088 ffffffff fa240100 00000073
00000017 dbad7f9c dbad7f68
<4>[ 5655.855438]
<4>[ 5655.855438] FP: 0xdbad7dbc:
<4>[ 5655.859893] 7dbc 00000065 dbad7fb0 c0658c04 00000000 c08c937c
ffffffff dbad7e1c afd0ce5c
<4>[ 5655.868499] 7ddc db3df4c0 dad0d558 c065876c c0658ae0 00000001
dbad7fb0 00000000 dbad7f68
<4>[ 5655.877075] 7dfc 00000000 afd0ce5c db3df4c0 dad0d558 00000017
dad0d58c dbad7e3c 00000008
<4>[ 5655.885681] 7e1c dbad7e30 c005c15c c00a1a4c a0000193 ffffffff
db3df7b4 00000000 0000c8e4
<4>[ 5655.894256] 7e3c c065a654 00000073 00000000 00000000 00000000
c098d6e0 c0056488 00080000
<4>[ 5655.902862] 7e5c c0062c74 00000073 00000073 00080000 c0062fe0
c08d3a80 00000073 c08d3abc
<4>[ 5655.911437] 7e7c c00f6b80 00000073 00000000 dbad7f14 c00ba5f4
00000073 c0056088 ffffffff
<4>[ 5655.920043] 7e9c fa240100 00000073 00000017 dbad7f9c dbad7f68
c08ddb28 afd0ce5c 00000193
<4>[ 5655.928619]
<4>[ 5655.928619] R0: 0xc0658a60:
<4>[ 5655.933074] 8a60 11a0000d 124fe068 1ae7f634 e5990004 e5898004
e1300007 17000000 e3a08000
<4>[ 5655.941680] 8a80 eae7f83e fa240100 000003fd e320f000 e320f000
e320f000 e320f000 e320f000
<4>[ 5655.950256] 8aa0 e24dd048 e98d1ffe e890000e e28d003c e3e04000
e58d1000 e880001c e9406000
<4>[ 5655.958862] 8ac0 e51f0168 e5900000 ee010f10 e28f9f63 e28fef4b
e3130020 02424004 12424002
<4>[ 5655.967437] 8ae0 04b40000 0a000008 e0f450b2 e2050b3e e3500b3a
3a000042 e0f400b0 e2822002
<4>[ 5655.976013] 8b00 e1800805 e28f60cc ea000000 e28f60ac e4967004
e3570000 0a000009 e0008007
<4>[ 5655.984619] 8b20 e4967004 e1580007 1afffff8 e1a0a6ad e1a0a68a
e3a07001 e5ca705a e5ca705b
<4>[ 5655.993194] 8b40 eae8ff95 e3100302 13100301 01a0f00e e1a0a6ad
e1a0a68a e2008c0f e3a07001
<4>[ 5656.001800]
<4>[ 5656.001800] R2: 0xdbad7f30:
<4>[ 5656.006256] 7f30 00000000 00000001 dc2c5aa8 dba42598 dbad6000
0000000b 0000c25c c014e3f8
<4>[ 5656.014831] 7f50 ffffffff dbad7f9c 0000000f 00000000 40005b04
c065876c 10c53c7d afd4b2f0
<4>[ 5656.023437] 7f70 afd0ce60 00000010 afd0ce5c 0f000000 0000000f
00000000 40005b04 c0658c60
<4>[ 5656.032012] 7f90 40005b00 0000c8e4 00000065 dbad7fb0 c0658c04
c0658ae0 40000093 ffffffff
<4>[ 5656.040618] 7fb0 afd4b2f0 40005b04 00000010 00000000 40005ae0
0f000000 0000000f 00000000
<4>[ 5656.049194] 7fd0 40005b04 afd4b2f0 40005b00 0000c8e4 00000065
be92f8f8 afd293d5 afd0ce60
<4>[ 5656.057800] 7ff0 00000010 ffffffff 80fdc021 80fdc421 9accb031
9accb431 00000000 00000000
<4>[ 5656.066375] 8010 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000
<4>[ 5656.074951]
<4>[ 5656.074981] R4: 0xdbad7ee8:
<4>[ 5656.079437] 7ee8 c0965c3c c0655f80 c0965bfc 00000043 dada7a00
c04a0e50 000480e5 00048128
<4>[ 5656.088012] 7f08 c0965c24 00001000 be931af0 00000000 db3df4c0
c00ce8a8 00000000 dba42598
<4>[ 5656.096588] 7f28 dc2c5aa8 00000043 00000000 00000001 dc2c5aa8
dba42598 dbad6000 0000000b
<4>[ 5656.105194] 7f48 0000c25c c014e3f8 ffffffff dbad7f9c 0000000f
00000000 40005b04 c065876c
<4>[ 5656.113769] 7f68 10c53c7d afd4b2f0 afd0ce60 00000010 afd0ce5c
0f000000 0000000f 00000000
<4>[ 5656.122375] 7f88 40005b04 c0658c60 40005b00 0000c8e4 00000065
dbad7fb0 c0658c04 c0658ae0
<4>[ 5656.130950] 7fa8 40000093 ffffffff afd4b2f0 40005b04 00000010
00000000 40005ae0 0f000000
<4>[ 5656.139556] 7fc8 0000000f 00000000 40005b04 afd4b2f0 40005b00
0000c8e4 00000065 be92f8f8
<4>[ 5656.148132]
<4>[ 5656.148132] R7: 0xdb3df440:
<4>[ 5656.152587] f440 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000
<4>[ 5656.161193] f460 00000000 0000c350 0000c350 00000000 00000000
00000000 91e1140e 91f1140e
<4>[ 5656.169769] f480 9201140e 9211140e 9221140e 9231140e 635688c0
d84156c5 9261140e c00b1d60
<4>[ 5656.178375] f4a0 9281140e 9291140e 92a1140e 92b1140e 92c1140e
92d1140e 635688c0 d84156c5
<4>[ 5656.186950] f4c0 00000000 dbad6000 00000002 00400100 00000000
ffffffff 00000001 00000078
<4>[ 5656.195556] f4e0 00000078 00000078 00000000 c0662fa0 00000400
00400000 c8a7a159 00000000
<4>[ 5656.204132] f500 00000000 c13e9db0 c13e9db0 00000001 c290ade8
00000524 63221a18 00000004
<4>[ 5656.212707] f520 b9d7fe54 0000032d 627899ea 00000004 000009fa
00000000 00000000 00000000
<4>[ 5656.221313]
<4>[ 5656.221313] R8: 0xdad0d4d8:
<4>[ 5656.225769] d4d8 beed6d34 00000000 00000000 00000000 00000000
00000000 00000000 00000030
<4>[ 5656.234375] d4f8 00000010 00000000 c08feee8 00000001 000001b6
00000000 00000000 00000000
<4>[ 5656.242950] d518 00000000 00000000 00000000 000001fd 00000000
00000000 00000000 00000000
<4>[ 5656.251525] d538 dba1f128 00000002 635688c0 d84156c5 00000000
c00b12a8 635688c0 d84156c5
<4>[ 5656.260131] d558 dad38350 daceb91c dbaf63c0 c0060ab0 c0137190
40000000 bf000000 ffffffff
<4>[ 5656.268707] d578 40015000 db304000 00000001 00000001 00000021
00000002 00000000 00000000
<4>[ 5656.277313] d598 dad0d598 dad0d598 00000000 00000000 dad0d5a8
dad0d5a8 0000167c 00001855
<4>[ 5656.285888] d5b8 0000033f 00000000 000002d7 000002a9 00000022
00000000 00000000 0000000c
<4>[ 5656.294494]
<4>[ 5656.294494] R10: 0xdad0d50c:
<4>[ 5656.299041] d50c 00000000 00000000 00000000 00000000 00000000
00000000 000001fd 00000000
<4>[ 5656.307617] d52c 00000000 00000000 00000000 dba1f128 00000002
635688c0 d84156c5 00000000
<4>[ 5656.316223] d54c c00b12a8 635688c0 d84156c5 dad38350 daceb91c
dbaf63c0 c0060ab0 c0137190
<4>[ 5656.324798] d56c 40000000 bf000000 ffffffff 40015000 db304000
00000001 00000001 00000021
<4>[ 5656.333404] d58c 00000002 00000000 00000000 dad0d598 dad0d598
00000000 00000000 dad0d5a8
<4>[ 5656.341979] d5ac dad0d5a8 0000167c 00001855 0000033f 00000000
000002d7 000002a9 00000022
<4>[ 5656.350555] d5cc 00000000 00000000 0000000c 00008000 0000b470
0000c000 0000c7ac 0000d000
<4>[ 5656.359161] d5ec 0002a000 be931c20 be931d13 be931d26 be931d26
be931fe9 00000010 000038d7
<0>[ 5656.367736] Process aplogd (pid: 189, stack limit = 0xdbad62f8)
<0>[ 5656.373931] Stack: (0xdbad7e30 to 0xdbad8000)
<0>[ 5656.378479] 7e20: db3df7b4
00000000 0000c8e4 c065a654
<0>[ 5656.387023] 7e40: 00000073 00000000 00000000 00000000 c098d6e0
c0056488 00080000 c0062c74
<0>[ 5656.395538] 7e60: 00000073 00000073 00080000 c0062fe0 c08d3a80
00000073 c08d3abc c00f6b80
<0>[ 5656.404083] 7e80: 00000073 00000000 dbad7f14 c00ba5f4 00000073
c0056088 ffffffff fa240100
<0>[ 5656.412628] 7ea0: 00000073 00000017 dbad7f9c dbad7f68 c08ddb28
afd0ce5c 00000193 40005b00
<0>[ 5656.421173] 7ec0: 0000c8e4 c0056488 00000043 be92fb30 dace2880
dbad7f14 00000000 dbad7ef0
<0>[ 5656.429687] 7ee0: c04a0e50 c0655f08 c0965c3c c0655f80 c0965bfc
00000043 dada7a00 c04a0e50
<0>[ 5656.438232] 7f00: 000480e5 00048128 c0965c24 00001000 be931af0
00000000 db3df4c0 c00ce8a8
<0>[ 5656.446777] 7f20: 00000000 dba42598 dc2c5aa8 00000043 00000000
00000001 dc2c5aa8 dba42598
<0>[ 5656.455322] 7f40: dbad6000 0000000b 0000c25c c014e3f8 ffffffff
dbad7f9c 0000000f 00000000
<0>[ 5656.463867] 7f60: 40005b04 c065876c 10c53c7d afd4b2f0 afd0ce60
00000010 afd0ce5c 0f000000
<0>[ 5656.472381] 7f80: 0000000f 00000000 40005b04 c0658c60 40005b00
0000c8e4 00000065 dbad7fb0
<0>[ 5656.480926] 7fa0: c0658c04 c0658ae0 40000093 ffffffff afd4b2f0
40005b04 00000010 00000000
<0>[ 5656.489471] 7fc0: 40005ae0 0f000000 0000000f 00000000 40005b04
afd4b2f0 40005b00 0000c8e4
<0>[ 5656.498016] 7fe0: 00000065 be92f8f8 afd293d5 afd0ce60 00000010
ffffffff 80fdc021 80fdc421
<4>[ 5656.506561] [<c00a1a4c>] (__might_sleep+0x120/0x148) from
[<c065a654>] (do_page_fault+0x130/0x378)
<4>[ 5656.515930] [<c065a654>] (do_page_fault+0x130/0x378) from
[<c0056488>] (do_DataAbort+0x34/0xb4)
<4>[ 5656.524993] [<c0056488>] (do_DataAbort+0x34/0xb4) from
[<c065876c>] (__dabt_svc+0x4c/0x60)
<4>[ 5656.533630] Exception stack(0xdbad7f68 to 0xdbad7fb0)
<4>[ 5656.538909] 7f60: 10c53c7d afd4b2f0 afd0ce60
00000010 afd0ce5c 0f000000
<4>[ 5656.547454] 7f80: 0000000f 00000000 40005b04 c0658c60 40005b00
0000c8e4 00000065 dbad7fb0
<4>[ 5656.555999] 7fa0: c0658c04 c0658ae0 40000093 ffffffff
<4>[ 5656.561248] [<c065876c>] (__dabt_svc+0x4c/0x60) from
[<c0658ae0>] (__und_usr+0x40/0x6c)
<0>[ 5656.569610] Code: eb16cbf3 e10f3000 eb16cb92 e3a03000 (e5833000)
<4>[ 5656.576202] ---[ end trace 1b75b31a2719ed25 ]---
--
Best Regards
Hu Tao
^ permalink raw reply [flat|nested] 10+ messages in thread
* Bug in _und_usr on dual-core ARM?
@ 2011-06-21 8:31 ` TAO HU
0 siblings, 0 replies; 10+ messages in thread
From: TAO HU @ 2011-06-21 8:31 UTC (permalink / raw)
To: linux-arm-kernel
Hi, All
We got an issue on our OMAP4 SMP system.
Looks like __und_user(), which was triggered by a user space
exception, got a page fault hence lead to might_sleep() failure.
Is it an race condition for dual-core system?
E.g. CPU0 exception->CPU0 __und_user()->CPU1 change MMU->CPU0 data abort
Any suggestions?
<3>[ 5655.430236] BUG: sleeping function called from invalid context
at arch/arm/mm/fault.c:295
<3>[ 5655.449554] in_atomic(): 0, irqs_disabled(): 128, pid: 189, name: aplogd
<4>[ 5655.456573] [<c005c65c>] (unwind_backtrace+0x0/0x164) from
[<c00a1a48>] (__might_sleep+0x11c/0x148)
<4>[ 5655.466033] [<c00a1a48>] (__might_sleep+0x11c/0x148) from
[<c065a654>] (do_page_fault+0x130/0x378)
<4>[ 5655.475372] [<c065a654>] (do_page_fault+0x130/0x378) from
[<c0056488>] (do_DataAbort+0x34/0xb4)
<4>[ 5655.484466] [<c0056488>] (do_DataAbort+0x34/0xb4) from
[<c065876c>] (__dabt_svc+0x4c/0x60)
<4>[ 5655.493103] Exception stack(0xdbad7f68 to 0xdbad7fb0)
<4>[ 5655.498382] 7f60: 10c53c7d afd4b2f0 afd0ce60
00000010 afd0ce5c 0f000000
<4>[ 5655.506927] 7f80: 0000000f 00000000 40005b04 c0658c60 40005b00
0000c8e4 00000065 dbad7fb0
<4>[ 5655.515472] 7fa0: c0658c04 c0658ae0 40000093 ffffffff
<4>[ 5655.520751] [<c065876c>] (__dabt_svc+0x4c/0x60) from
[<c0658ae0>] (__und_usr+0x40/0x6c)
<1>[ 5655.529113] Unable to handle kernel NULL pointer dereference at
virtual address 00000000
<1>[ 5655.537567] pgd = db304000
<1>[ 5655.540374] [00000000] *pgd=9b318031, *pte=00000000, *ppte=00000000
<0>[ 5655.546936] Internal error: Oops: 817 [#1] PREEMPT SMP
<0>[ 5655.552307] last sysfs file:
/sys/devices/virtual/net/ppp0/statistics/rx_packets
... ...
<4>[ 5655.575286] CPU: 0 Tainted: G WC (2.6.35.7-eng-gfa3c8e3 #1)
<4>[ 5655.582183] PC is at __might_sleep+0x120/0x148
<4>[ 5655.586822] LR is at unwind_frame+0xe0/0x5e0
<4>[ 5655.591278] pc : [<c00a1a4c>] lr : [<c005c15c>] psr: a0000193
<4>[ 5655.591278] sp : dbad7e30 ip : 00000008 fp : dbad7e3c
<4>[ 5655.603271] r10: dad0d58c r9 : 00000017 r8 : dad0d558
<4>[ 5655.608734] r7 : db3df4c0 r6 : afd0ce5c r5 : 00000000 r4 : dbad7f68
<4>[ 5655.615539] r3 : 00000000 r2 : dbad7fb0 r1 : 00000001 r0 : c0658ae0
<4>[ 5655.622344] Flags: NzCv IRQs off FIQs on Mode SVC_32 ISA ARM
Segment user
<4>[ 5655.629913] Control: 10c53c7d Table: 9b30404a DAC: 00000015
<4>[ 5655.635894]
<4>[ 5655.635894] PC: 0xc00a19cc:
<4>[ 5655.640350] 19cc e3520000 1a00001f e59f308c e1a0200c e1a01000
e59f0084 e593c000 e59f3074
<4>[ 5655.648956] 19ec e583c030 eb16cc06 e1a0200d e3c23d7f e3c3303f
e593200c e5931004 e5922014
<4>[ 5655.657531] 1a0c e3c11101 e1e02002 e1a02fa2 e0511002 13a01001
e10f2000 e593300c e2022080
<4>[ 5655.666137] 1a2c e59f003c e283cfbd e58dc000 e59331f4 eb16cbf3
e10f3000 eb16cb92 e3a03000
<4>[ 5655.674743] 1a4c e5833000 eafffffd e24bd004 e8bd8800 c09900e4
c098d368 c098f360 c08d0080
<4>[ 5655.683319] 1a6c c07bbbfc c07bbc3c e92d4830 e1a04001 e28db00c
e1a05000 e10f3000 e2133080
<4>[ 5655.691925] 1a8c 1a000001 e5833000 eafffffd e1500001 0a000006
2a000002 eb16d9fb e1a00004
<4>[ 5655.700500] 1aac ea000002 e1a00001 eb16d9f7 e1a00005 e8bd4830
ea16d9f4 e92d4bf0 e59f7060
<4>[ 5655.709106]
<4>[ 5655.709106] LR: 0xc005c0dc:
<4>[ 5655.713562] c0dc e5d3305f e3530000 1a000124 e594000c eb01c075
e3500000 0a00011d e59f3508
<4>[ 5655.722137] c0fc e3a01502 e594500c e1c360d0 e0073001 e3530000
0a000009 e59f34f0 e3a01002
<4>[ 5655.730743] c11c e1c360d0 e0073001 e3530000 0a000003 e59f34dc
e5d33077 e3530000 1a000116
<4>[ 5655.739318] c13c e1a00005 eb01c02c e3500000 0a000005 e1a00005
e59f14bc e59f24bc ebfffee2
<4>[ 5655.747924] c15c e1a05000 ea00001c e59f04b0 eb17f024 e59f34ac
e1a01003 e5933000 e1a06000
<4>[ 5655.756500] c17c ea00000d e5930010 e1550000 3a000009 e5930014
e1550000 2a000006 e593200c
<4>[ 5655.765106] c19c e1a00005 e5931008 e2422008 ebfffece e1a05000
ea000005 e1a03002 e5932000
<4>[ 5655.773681] c1bc f5d2f000 e1530001 1affffed e3a05000 e1a01006
e59f0444 eb17eefd e59f3428
<4>[ 5655.782287]
<4>[ 5655.782287] SP: 0xdbad7db0:
<4>[ 5655.786743] 7db0 c0658c60 40005b00 0000c8e4 00000065 dbad7fb0
c0658c04 00000000 c08c937c
<4>[ 5655.795318] 7dd0 ffffffff dbad7e1c afd0ce5c db3df4c0 dad0d558
c065876c c0658ae0 00000001
<4>[ 5655.803924] 7df0 dbad7fb0 00000000 dbad7f68 00000000 afd0ce5c
db3df4c0 dad0d558 00000017
<4>[ 5655.812500] 7e10 dad0d58c dbad7e3c 00000008 dbad7e30 c005c15c
c00a1a4c a0000193 ffffffff
<4>[ 5655.821105] 7e30 db3df7b4 00000000 0000c8e4 c065a654 00000073
00000000 00000000 00000000
<4>[ 5655.829681] 7e50 c098d6e0 c0056488 00080000 c0062c74 00000073
00000073 00080000 c0062fe0
<4>[ 5655.838256] 7e70 c08d3a80 00000073 c08d3abc c00f6b80 00000073
00000000 dbad7f14 c00ba5f4
<4>[ 5655.846862] 7e90 00000073 c0056088 ffffffff fa240100 00000073
00000017 dbad7f9c dbad7f68
<4>[ 5655.855438]
<4>[ 5655.855438] FP: 0xdbad7dbc:
<4>[ 5655.859893] 7dbc 00000065 dbad7fb0 c0658c04 00000000 c08c937c
ffffffff dbad7e1c afd0ce5c
<4>[ 5655.868499] 7ddc db3df4c0 dad0d558 c065876c c0658ae0 00000001
dbad7fb0 00000000 dbad7f68
<4>[ 5655.877075] 7dfc 00000000 afd0ce5c db3df4c0 dad0d558 00000017
dad0d58c dbad7e3c 00000008
<4>[ 5655.885681] 7e1c dbad7e30 c005c15c c00a1a4c a0000193 ffffffff
db3df7b4 00000000 0000c8e4
<4>[ 5655.894256] 7e3c c065a654 00000073 00000000 00000000 00000000
c098d6e0 c0056488 00080000
<4>[ 5655.902862] 7e5c c0062c74 00000073 00000073 00080000 c0062fe0
c08d3a80 00000073 c08d3abc
<4>[ 5655.911437] 7e7c c00f6b80 00000073 00000000 dbad7f14 c00ba5f4
00000073 c0056088 ffffffff
<4>[ 5655.920043] 7e9c fa240100 00000073 00000017 dbad7f9c dbad7f68
c08ddb28 afd0ce5c 00000193
<4>[ 5655.928619]
<4>[ 5655.928619] R0: 0xc0658a60:
<4>[ 5655.933074] 8a60 11a0000d 124fe068 1ae7f634 e5990004 e5898004
e1300007 17000000 e3a08000
<4>[ 5655.941680] 8a80 eae7f83e fa240100 000003fd e320f000 e320f000
e320f000 e320f000 e320f000
<4>[ 5655.950256] 8aa0 e24dd048 e98d1ffe e890000e e28d003c e3e04000
e58d1000 e880001c e9406000
<4>[ 5655.958862] 8ac0 e51f0168 e5900000 ee010f10 e28f9f63 e28fef4b
e3130020 02424004 12424002
<4>[ 5655.967437] 8ae0 04b40000 0a000008 e0f450b2 e2050b3e e3500b3a
3a000042 e0f400b0 e2822002
<4>[ 5655.976013] 8b00 e1800805 e28f60cc ea000000 e28f60ac e4967004
e3570000 0a000009 e0008007
<4>[ 5655.984619] 8b20 e4967004 e1580007 1afffff8 e1a0a6ad e1a0a68a
e3a07001 e5ca705a e5ca705b
<4>[ 5655.993194] 8b40 eae8ff95 e3100302 13100301 01a0f00e e1a0a6ad
e1a0a68a e2008c0f e3a07001
<4>[ 5656.001800]
<4>[ 5656.001800] R2: 0xdbad7f30:
<4>[ 5656.006256] 7f30 00000000 00000001 dc2c5aa8 dba42598 dbad6000
0000000b 0000c25c c014e3f8
<4>[ 5656.014831] 7f50 ffffffff dbad7f9c 0000000f 00000000 40005b04
c065876c 10c53c7d afd4b2f0
<4>[ 5656.023437] 7f70 afd0ce60 00000010 afd0ce5c 0f000000 0000000f
00000000 40005b04 c0658c60
<4>[ 5656.032012] 7f90 40005b00 0000c8e4 00000065 dbad7fb0 c0658c04
c0658ae0 40000093 ffffffff
<4>[ 5656.040618] 7fb0 afd4b2f0 40005b04 00000010 00000000 40005ae0
0f000000 0000000f 00000000
<4>[ 5656.049194] 7fd0 40005b04 afd4b2f0 40005b00 0000c8e4 00000065
be92f8f8 afd293d5 afd0ce60
<4>[ 5656.057800] 7ff0 00000010 ffffffff 80fdc021 80fdc421 9accb031
9accb431 00000000 00000000
<4>[ 5656.066375] 8010 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000
<4>[ 5656.074951]
<4>[ 5656.074981] R4: 0xdbad7ee8:
<4>[ 5656.079437] 7ee8 c0965c3c c0655f80 c0965bfc 00000043 dada7a00
c04a0e50 000480e5 00048128
<4>[ 5656.088012] 7f08 c0965c24 00001000 be931af0 00000000 db3df4c0
c00ce8a8 00000000 dba42598
<4>[ 5656.096588] 7f28 dc2c5aa8 00000043 00000000 00000001 dc2c5aa8
dba42598 dbad6000 0000000b
<4>[ 5656.105194] 7f48 0000c25c c014e3f8 ffffffff dbad7f9c 0000000f
00000000 40005b04 c065876c
<4>[ 5656.113769] 7f68 10c53c7d afd4b2f0 afd0ce60 00000010 afd0ce5c
0f000000 0000000f 00000000
<4>[ 5656.122375] 7f88 40005b04 c0658c60 40005b00 0000c8e4 00000065
dbad7fb0 c0658c04 c0658ae0
<4>[ 5656.130950] 7fa8 40000093 ffffffff afd4b2f0 40005b04 00000010
00000000 40005ae0 0f000000
<4>[ 5656.139556] 7fc8 0000000f 00000000 40005b04 afd4b2f0 40005b00
0000c8e4 00000065 be92f8f8
<4>[ 5656.148132]
<4>[ 5656.148132] R7: 0xdb3df440:
<4>[ 5656.152587] f440 00000000 00000000 00000000 00000000 00000000
00000000 00000000 00000000
<4>[ 5656.161193] f460 00000000 0000c350 0000c350 00000000 00000000
00000000 91e1140e 91f1140e
<4>[ 5656.169769] f480 9201140e 9211140e 9221140e 9231140e 635688c0
d84156c5 9261140e c00b1d60
<4>[ 5656.178375] f4a0 9281140e 9291140e 92a1140e 92b1140e 92c1140e
92d1140e 635688c0 d84156c5
<4>[ 5656.186950] f4c0 00000000 dbad6000 00000002 00400100 00000000
ffffffff 00000001 00000078
<4>[ 5656.195556] f4e0 00000078 00000078 00000000 c0662fa0 00000400
00400000 c8a7a159 00000000
<4>[ 5656.204132] f500 00000000 c13e9db0 c13e9db0 00000001 c290ade8
00000524 63221a18 00000004
<4>[ 5656.212707] f520 b9d7fe54 0000032d 627899ea 00000004 000009fa
00000000 00000000 00000000
<4>[ 5656.221313]
<4>[ 5656.221313] R8: 0xdad0d4d8:
<4>[ 5656.225769] d4d8 beed6d34 00000000 00000000 00000000 00000000
00000000 00000000 00000030
<4>[ 5656.234375] d4f8 00000010 00000000 c08feee8 00000001 000001b6
00000000 00000000 00000000
<4>[ 5656.242950] d518 00000000 00000000 00000000 000001fd 00000000
00000000 00000000 00000000
<4>[ 5656.251525] d538 dba1f128 00000002 635688c0 d84156c5 00000000
c00b12a8 635688c0 d84156c5
<4>[ 5656.260131] d558 dad38350 daceb91c dbaf63c0 c0060ab0 c0137190
40000000 bf000000 ffffffff
<4>[ 5656.268707] d578 40015000 db304000 00000001 00000001 00000021
00000002 00000000 00000000
<4>[ 5656.277313] d598 dad0d598 dad0d598 00000000 00000000 dad0d5a8
dad0d5a8 0000167c 00001855
<4>[ 5656.285888] d5b8 0000033f 00000000 000002d7 000002a9 00000022
00000000 00000000 0000000c
<4>[ 5656.294494]
<4>[ 5656.294494] R10: 0xdad0d50c:
<4>[ 5656.299041] d50c 00000000 00000000 00000000 00000000 00000000
00000000 000001fd 00000000
<4>[ 5656.307617] d52c 00000000 00000000 00000000 dba1f128 00000002
635688c0 d84156c5 00000000
<4>[ 5656.316223] d54c c00b12a8 635688c0 d84156c5 dad38350 daceb91c
dbaf63c0 c0060ab0 c0137190
<4>[ 5656.324798] d56c 40000000 bf000000 ffffffff 40015000 db304000
00000001 00000001 00000021
<4>[ 5656.333404] d58c 00000002 00000000 00000000 dad0d598 dad0d598
00000000 00000000 dad0d5a8
<4>[ 5656.341979] d5ac dad0d5a8 0000167c 00001855 0000033f 00000000
000002d7 000002a9 00000022
<4>[ 5656.350555] d5cc 00000000 00000000 0000000c 00008000 0000b470
0000c000 0000c7ac 0000d000
<4>[ 5656.359161] d5ec 0002a000 be931c20 be931d13 be931d26 be931d26
be931fe9 00000010 000038d7
<0>[ 5656.367736] Process aplogd (pid: 189, stack limit = 0xdbad62f8)
<0>[ 5656.373931] Stack: (0xdbad7e30 to 0xdbad8000)
<0>[ 5656.378479] 7e20: db3df7b4
00000000 0000c8e4 c065a654
<0>[ 5656.387023] 7e40: 00000073 00000000 00000000 00000000 c098d6e0
c0056488 00080000 c0062c74
<0>[ 5656.395538] 7e60: 00000073 00000073 00080000 c0062fe0 c08d3a80
00000073 c08d3abc c00f6b80
<0>[ 5656.404083] 7e80: 00000073 00000000 dbad7f14 c00ba5f4 00000073
c0056088 ffffffff fa240100
<0>[ 5656.412628] 7ea0: 00000073 00000017 dbad7f9c dbad7f68 c08ddb28
afd0ce5c 00000193 40005b00
<0>[ 5656.421173] 7ec0: 0000c8e4 c0056488 00000043 be92fb30 dace2880
dbad7f14 00000000 dbad7ef0
<0>[ 5656.429687] 7ee0: c04a0e50 c0655f08 c0965c3c c0655f80 c0965bfc
00000043 dada7a00 c04a0e50
<0>[ 5656.438232] 7f00: 000480e5 00048128 c0965c24 00001000 be931af0
00000000 db3df4c0 c00ce8a8
<0>[ 5656.446777] 7f20: 00000000 dba42598 dc2c5aa8 00000043 00000000
00000001 dc2c5aa8 dba42598
<0>[ 5656.455322] 7f40: dbad6000 0000000b 0000c25c c014e3f8 ffffffff
dbad7f9c 0000000f 00000000
<0>[ 5656.463867] 7f60: 40005b04 c065876c 10c53c7d afd4b2f0 afd0ce60
00000010 afd0ce5c 0f000000
<0>[ 5656.472381] 7f80: 0000000f 00000000 40005b04 c0658c60 40005b00
0000c8e4 00000065 dbad7fb0
<0>[ 5656.480926] 7fa0: c0658c04 c0658ae0 40000093 ffffffff afd4b2f0
40005b04 00000010 00000000
<0>[ 5656.489471] 7fc0: 40005ae0 0f000000 0000000f 00000000 40005b04
afd4b2f0 40005b00 0000c8e4
<0>[ 5656.498016] 7fe0: 00000065 be92f8f8 afd293d5 afd0ce60 00000010
ffffffff 80fdc021 80fdc421
<4>[ 5656.506561] [<c00a1a4c>] (__might_sleep+0x120/0x148) from
[<c065a654>] (do_page_fault+0x130/0x378)
<4>[ 5656.515930] [<c065a654>] (do_page_fault+0x130/0x378) from
[<c0056488>] (do_DataAbort+0x34/0xb4)
<4>[ 5656.524993] [<c0056488>] (do_DataAbort+0x34/0xb4) from
[<c065876c>] (__dabt_svc+0x4c/0x60)
<4>[ 5656.533630] Exception stack(0xdbad7f68 to 0xdbad7fb0)
<4>[ 5656.538909] 7f60: 10c53c7d afd4b2f0 afd0ce60
00000010 afd0ce5c 0f000000
<4>[ 5656.547454] 7f80: 0000000f 00000000 40005b04 c0658c60 40005b00
0000c8e4 00000065 dbad7fb0
<4>[ 5656.555999] 7fa0: c0658c04 c0658ae0 40000093 ffffffff
<4>[ 5656.561248] [<c065876c>] (__dabt_svc+0x4c/0x60) from
[<c0658ae0>] (__und_usr+0x40/0x6c)
<0>[ 5656.569610] Code: eb16cbf3 e10f3000 eb16cb92 e3a03000 (e5833000)
<4>[ 5656.576202] ---[ end trace 1b75b31a2719ed25 ]---
--
Best Regards
Hu Tao
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: Bug in _und_usr on dual-core ARM?
2011-06-21 8:31 ` TAO HU
@ 2011-06-21 9:15 ` Russell King - ARM Linux
-1 siblings, 0 replies; 10+ messages in thread
From: Russell King - ARM Linux @ 2011-06-21 9:15 UTC (permalink / raw)
To: TAO HU; +Cc: linux-arm-kernel, linux-omap, Zhou Ming-a17711
On Tue, Jun 21, 2011 at 04:31:19PM +0800, TAO HU wrote:
> Hi, All
>
> We got an issue on our OMAP4 SMP system.
> Looks like __und_user(), which was triggered by a user space
> exception, got a page fault hence lead to might_sleep() failure.
Could you see whether this patch prevents the warning please.
diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c
index bc0e1d8..d52b940 100644
--- a/arch/arm/mm/fault.c
+++ b/arch/arm/mm/fault.c
@@ -289,7 +289,7 @@ do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
* If we're in an interrupt or have no user
* context, we must not take the fault..
*/
- if (in_atomic() || !mm)
+ if (in_atomic() || irqs_disabled() || !mm)
goto no_context;
/*
^ permalink raw reply related [flat|nested] 10+ messages in thread
* Bug in _und_usr on dual-core ARM?
@ 2011-06-21 9:15 ` Russell King - ARM Linux
0 siblings, 0 replies; 10+ messages in thread
From: Russell King - ARM Linux @ 2011-06-21 9:15 UTC (permalink / raw)
To: linux-arm-kernel
On Tue, Jun 21, 2011 at 04:31:19PM +0800, TAO HU wrote:
> Hi, All
>
> We got an issue on our OMAP4 SMP system.
> Looks like __und_user(), which was triggered by a user space
> exception, got a page fault hence lead to might_sleep() failure.
Could you see whether this patch prevents the warning please.
diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c
index bc0e1d8..d52b940 100644
--- a/arch/arm/mm/fault.c
+++ b/arch/arm/mm/fault.c
@@ -289,7 +289,7 @@ do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
* If we're in an interrupt or have no user
* context, we must not take the fault..
*/
- if (in_atomic() || !mm)
+ if (in_atomic() || irqs_disabled() || !mm)
goto no_context;
/*
^ permalink raw reply related [flat|nested] 10+ messages in thread
* Re: Bug in _und_usr on dual-core ARM?
2011-06-21 9:15 ` Russell King - ARM Linux
@ 2011-06-21 9:37 ` TAO HU
-1 siblings, 0 replies; 10+ messages in thread
From: TAO HU @ 2011-06-21 9:37 UTC (permalink / raw)
To: Russell King - ARM Linux; +Cc: linux-arm-kernel, linux-omap, Zhou Ming-a17711
Hi, Russell
Wouldn't it lead to oops with your patch?
We're trying avoid oops actually.
On Tue, Jun 21, 2011 at 5:15 PM, Russell King - ARM Linux
<linux@arm.linux.org.uk> wrote:
> On Tue, Jun 21, 2011 at 04:31:19PM +0800, TAO HU wrote:
>> Hi, All
>>
>> We got an issue on our OMAP4 SMP system.
>> Looks like __und_user(), which was triggered by a user space
>> exception, got a page fault hence lead to might_sleep() failure.
>
> Could you see whether this patch prevents the warning please.
>
> diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c
> index bc0e1d8..d52b940 100644
> --- a/arch/arm/mm/fault.c
> +++ b/arch/arm/mm/fault.c
> @@ -289,7 +289,7 @@ do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
> * If we're in an interrupt or have no user
> * context, we must not take the fault..
> */
> - if (in_atomic() || !mm)
> + if (in_atomic() || irqs_disabled() || !mm)
> goto no_context;
>
> /*
>
>
--
Best Regards
Hu Tao
--
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
^ permalink raw reply [flat|nested] 10+ messages in thread
* Bug in _und_usr on dual-core ARM?
@ 2011-06-21 9:37 ` TAO HU
0 siblings, 0 replies; 10+ messages in thread
From: TAO HU @ 2011-06-21 9:37 UTC (permalink / raw)
To: linux-arm-kernel
Hi, Russell
Wouldn't it lead to oops with your patch?
We're trying avoid oops actually.
On Tue, Jun 21, 2011 at 5:15 PM, Russell King - ARM Linux
<linux@arm.linux.org.uk> wrote:
> On Tue, Jun 21, 2011 at 04:31:19PM +0800, TAO HU wrote:
>> Hi, All
>>
>> We got an issue on our OMAP4 SMP system.
>> Looks like __und_user(), which was triggered by a user space
>> exception, got a page fault hence lead to might_sleep() failure.
>
> Could you see whether this patch prevents the warning please.
>
> diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c
> index bc0e1d8..d52b940 100644
> --- a/arch/arm/mm/fault.c
> +++ b/arch/arm/mm/fault.c
> @@ -289,7 +289,7 @@ do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
> ? ? ? ? * If we're in an interrupt or have no user
> ? ? ? ? * context, we must not take the fault..
> ? ? ? ? */
> - ? ? ? if (in_atomic() || !mm)
> + ? ? ? if (in_atomic() || irqs_disabled() || !mm)
> ? ? ? ? ? ? ? ?goto no_context;
>
> ? ? ? ?/*
>
>
--
Best Regards
Hu Tao
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: Bug in _und_usr on dual-core ARM?
2011-06-21 9:37 ` TAO HU
@ 2011-06-21 9:58 ` Russell King - ARM Linux
-1 siblings, 0 replies; 10+ messages in thread
From: Russell King - ARM Linux @ 2011-06-21 9:58 UTC (permalink / raw)
To: TAO HU; +Cc: linux-arm-kernel, linux-omap, Zhou Ming-a17711
On Tue, Jun 21, 2011 at 05:37:31PM +0800, TAO HU wrote:
> Hi, Russell
>
> Wouldn't it lead to oops with your patch?
The might_sleep() occurs because its trying to process the page fault.
We shouldn't be trying to do that with IRQs disabled - instead, we
should try to fix up the fault from kernel space by invoking the fixup
for the ldrt instructions in __und_usr.
This may throw the system into a loop against your process (which you
should still be able to kill) which will suggest that there's dirty
I-cache lines - we seem to be executing code in a non-present page
(at 0xafd0ce5c).
^ permalink raw reply [flat|nested] 10+ messages in thread
* Bug in _und_usr on dual-core ARM?
@ 2011-06-21 9:58 ` Russell King - ARM Linux
0 siblings, 0 replies; 10+ messages in thread
From: Russell King - ARM Linux @ 2011-06-21 9:58 UTC (permalink / raw)
To: linux-arm-kernel
On Tue, Jun 21, 2011 at 05:37:31PM +0800, TAO HU wrote:
> Hi, Russell
>
> Wouldn't it lead to oops with your patch?
The might_sleep() occurs because its trying to process the page fault.
We shouldn't be trying to do that with IRQs disabled - instead, we
should try to fix up the fault from kernel space by invoking the fixup
for the ldrt instructions in __und_usr.
This may throw the system into a loop against your process (which you
should still be able to kill) which will suggest that there's dirty
I-cache lines - we seem to be executing code in a non-present page
(at 0xafd0ce5c).
^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: Bug in _und_usr on dual-core ARM?
2011-06-21 9:15 ` Russell King - ARM Linux
@ 2012-04-20 12:37 ` Rabin Vincent
-1 siblings, 0 replies; 10+ messages in thread
From: Rabin Vincent @ 2012-04-20 12:37 UTC (permalink / raw)
To: Russell King - ARM Linux
Cc: TAO HU, linux-omap, Zhou Ming-a17711, linux-arm-kernel
On Tue, Jun 21, 2011 at 14:45, Russell King - ARM Linux
<linux@arm.linux.org.uk> wrote:
> On Tue, Jun 21, 2011 at 04:31:19PM +0800, TAO HU wrote:
>> We got an issue on our OMAP4 SMP system.
>> Looks like __und_user(), which was triggered by a user space
>> exception, got a page fault hence lead to might_sleep() failure.
>
> Could you see whether this patch prevents the warning please.
>
> diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c
> index bc0e1d8..d52b940 100644
> --- a/arch/arm/mm/fault.c
> +++ b/arch/arm/mm/fault.c
> @@ -289,7 +289,7 @@ do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
> * If we're in an interrupt or have no user
> * context, we must not take the fault..
> */
> - if (in_atomic() || !mm)
> + if (in_atomic() || irqs_disabled() || !mm)
> goto no_context;
>
> /*
I am able to trigger the discussed warning on current mainline with a
constructed test case, and the above patch does prevent it. Could it
please be applied?
--
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
^ permalink raw reply [flat|nested] 10+ messages in thread
* Bug in _und_usr on dual-core ARM?
@ 2012-04-20 12:37 ` Rabin Vincent
0 siblings, 0 replies; 10+ messages in thread
From: Rabin Vincent @ 2012-04-20 12:37 UTC (permalink / raw)
To: linux-arm-kernel
On Tue, Jun 21, 2011 at 14:45, Russell King - ARM Linux
<linux@arm.linux.org.uk> wrote:
> On Tue, Jun 21, 2011 at 04:31:19PM +0800, TAO HU wrote:
>> We got an issue on our OMAP4 SMP system.
>> Looks like __und_user(), which was triggered by a user space
>> exception, got a page fault hence lead to might_sleep() failure.
>
> Could you see whether this patch prevents the warning please.
>
> diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c
> index bc0e1d8..d52b940 100644
> --- a/arch/arm/mm/fault.c
> +++ b/arch/arm/mm/fault.c
> @@ -289,7 +289,7 @@ do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
> ? ? ? ? * If we're in an interrupt or have no user
> ? ? ? ? * context, we must not take the fault..
> ? ? ? ? */
> - ? ? ? if (in_atomic() || !mm)
> + ? ? ? if (in_atomic() || irqs_disabled() || !mm)
> ? ? ? ? ? ? ? ?goto no_context;
>
> ? ? ? ?/*
I am able to trigger the discussed warning on current mainline with a
constructed test case, and the above patch does prevent it. Could it
please be applied?
^ permalink raw reply [flat|nested] 10+ messages in thread
end of thread, other threads:[~2012-04-20 12:38 UTC | newest]
Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2011-06-21 8:31 Bug in _und_usr on dual-core ARM? TAO HU
2011-06-21 8:31 ` TAO HU
2011-06-21 9:15 ` Russell King - ARM Linux
2011-06-21 9:15 ` Russell King - ARM Linux
2011-06-21 9:37 ` TAO HU
2011-06-21 9:37 ` TAO HU
2011-06-21 9:58 ` Russell King - ARM Linux
2011-06-21 9:58 ` Russell King - ARM Linux
2012-04-20 12:37 ` Rabin Vincent
2012-04-20 12:37 ` Rabin Vincent
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