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 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
