Hi, I have built a 3.1 mainline kernel with most stuff being configured as module. I hit two errors in the musb kernel driver: 1. When loading g_ether without ohci_hcd being loaded it crashes as in the first log. 2. When loading g_ether with ohci_hcd being loaded it crashes as in the second log. This also works with other usb gadget drivers, g_ether is just an example. -- Sebastian root@pandaboard:~# modprobe g_ether [ 4969.101165] gadget: using random self ethernet address [ 4969.106719] gadget: using random host ethernet address [ 4969.115814] usb0: MAC d2:12:be:ad:71:e2 [ 4969.119903] usb0: HOST MAC 56:f5:e8:c1:19:e0 [ 4969.125213] gadget: Ethernet Gadget, version: Memorial Day 2008 [ 4969.132385] gadget: g_ether ready [ 4969.136260] Unable to handle kernel NULL pointer dereference at virtual address 00000000 [ 4969.144775] pgd = da5d4000 [ 4969.147613] [00000000] *pgd=99cd2831, *pte=00000000, *ppte=00000000 [ 4969.154266] Internal error: Oops: 80000007 [#1] SMP [ 4969.159362] Modules linked in: g_ether(+) ehci_hcd smsc95xx usbnet mii twl6030_usb musb_hdrc omap2430 bnep rfcomm bluetooth rfkill crc16 nfsd nfs lockd fscache auth_rpcgss nfs_acl sunrpc ipv6 rtc_twl omap_wdt leds_gpio ext3 jbd mbcache [last unloaded: ohci_hcd] [ 4969.183746] CPU: 1 Not tainted (3.1.0-1-omap #1) [ 4969.188964] PC is at 0x0 [ 4969.191650] LR is at musb_gadget_start+0x64/0x12c [musb_hdrc] [ 4969.197692] pc : [<00000000>] lr : [<bf2a92b4>] psr: 60000193 [ 4969.197692] sp : d9617ec0 ip : 00000010 fp : 00000000 [ 4969.209716] r10: 0000001c r9 : 00000024 r8 : 00000001 [ 4969.215209] r7 : d95c5920 r6 : 60000113 r5 : da62c104 r4 : da62d0a4 [ 4969.222045] r3 : 00000000 r2 : 00000001 r1 : da62d0a4 r0 : da5696a0 [ 4969.228912] Flags: nZCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment user [ 4969.236480] Control: 10c5387d Table: 9a5d404a DAC: 00000015 [ 4969.242492] Process modprobe (pid: 875, stack limit = 0xd96162f8) [ 4969.248901] Stack: (0xd9617ec0 to 0xd9618000) [ 4969.253479] 7ec0: bf2a9250 d9525c00 00000000 bf30f0d4 d95c5920 c0218254 bf30f3f8 bf3129a4 [ 4969.262054] 7ee0: 00000000 c00087dc 00000000 00000001 bf30f3f8 bf30f3f8 bf30f440 bf30f3f8 [ 4969.270660] 7f00: bf30f440 00000001 d95c5920 00000001 00000024 c007ac5c bf30f404 c00d5f50 [ 4969.279235] 7f20: d9ae7c9c 00000124 c0077e30 c02f969c bf30f554 00a64f28 400fe000 dd3de000 [ 4969.287811] 7f40: 0000dac0 dd3e6758 dd3e65d9 dd3e8da0 d9700c00 0000663c 0000746c 00000000 [ 4969.296386] 7f60: 00000000 00000025 00000026 0000001a 0000001e 00000011 00000000 c03e5744 [ 4969.304992] 7f80: 00000000 00000000 00000000 00000000 00000080 c000da68 d9616000 00000000 [ 4969.313568] 7fa0: 00a6b0b0 c000d8c0 00000000 00000000 400fe000 0000dac0 00a64f28 00000000 [ 4969.322143] 7fc0: 00000000 00000000 00000000 00000080 00000000 00a64f18 00a63070 00a6b0b0 [ 4969.330718] 7fe0: 00a64f28 beac396c 0000b935 402d66c4 80000010 400fe000 00000000 00000000 [ 4969.339385] [<bf2a92b4>] (musb_gadget_start+0x64/0x12c [musb_hdrc]) from [<c0218254>] (usb_gadget_probe_driver+0xb8/0x168) [ 4969.350982] [<c0218254>] (usb_gadget_probe_driver+0xb8/0x168) from [<c00087dc>] (do_one_initcall+0x90/0x160) [ 4969.361297] [<c00087dc>] (do_one_initcall+0x90/0x160) from [<c007ac5c>] (sys_init_module+0x1854/0x19f8) [ 4969.371185] [<c007ac5c>] (sys_init_module+0x1854/0x19f8) from [<c000d8c0>] (ret_fast_syscall+0x0/0x30) [ 4969.380950] Code: bad PC value [ 4969.384185] ---[ end trace 62287d71178ad298 ]--- Segmentation fault root@pandaboard:~# modprobe g_ether [ 68.920532] gadget: using random self ethernet address [ 68.926116] gadget: using random host ethernet address [ 68.933197] usb0: MAC 3e:2d:6b:8c:c2:40 [ 68.937225] usb0: HOST MAC d2:02:40:84:39:96 [ 68.941833] gadget: Ethernet Gadget, version: Memorial Day 2008 [ 68.950927] gadget: g_ether ready [ 68.954589] omap_device: musb-omap2430.-1: new worst case activate latency 0: 61035 [ 69.158050] musb-hdrc musb-hdrc: MUSB HDRC host driver [ 69.163879] musb-hdrc musb-hdrc: new USB bus registered, assigned bus number 3 [ 69.171569] usb usb3: New USB device found, idVendor=1d6b, idProduct=0002 [ 69.178710] usb usb3: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 69.186309] usb usb3: Product: MUSB HDRC host driver [ 69.191528] usb usb3: Manufacturer: Linux 3.1.0-1-omap musb-hcd [ 69.197753] usb usb3: SerialNumber: musb-hdrc [ 69.202819] hub 3-0:1.0: USB hub found [ 69.206787] hub 3-0:1.0: 1 port detected [ 69.711425] gadget: high speed config #1: CDC Ethernet (ECM) [ 69.717498] Unable to handle kernel NULL pointer dereference at virtual address 00000000 [ 69.725982] pgd = c0004000 [ 69.728820] [00000000] *pgd=00000000 [ 69.732574] Internal error: Oops: 5 [#1] SMP [ 69.737030] Modules linked in: g_ether musb_hdrc omap2430 rfcomm bnep bluetooth rfkill crc16 nfsd nfs lockd fscache auth_rpcgss nfs_acl sunrpc ipv6 omap_wdt rtc_twl twl6030_usb leds_gpio ext3 jbd mbcache ohci_hcd ehci_hcd [ 69.757781] CPU: 0 Not tainted (3.1.0-1-omap #1) [ 69.763031] PC is at composite_setup+0x6b0/0xa34 [g_ether] [ 69.768768] LR is at composite_setup+0x630/0xa34 [g_ether] [ 69.774536] pc : [<bf2b7d90>] lr : [<bf2b7d10>] psr: 60000093 [ 69.774536] sp : c0461e58 ip : d9678160 fp : bf2bb274 [ 69.786560] r10: 00000000 r9 : d9dd5260 r8 : 00000000 [ 69.792053] r7 : da5cf0a4 r6 : bf2bb274 r5 : d9dd52a8 r4 : da630c60 [ 69.798889] r3 : d9dd52a8 r2 : c0461e14 r1 : c03c64d2 r0 : 00000047 [ 69.805755] Flags: nZCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment kernel [ 69.813507] Control: 10c5387d Table: 9a65804a DAC: 00000015 [ 69.819549] Process swapper (pid: 0, stack limit = 0xc04602f8) [ 69.825653] Stack: (0xc0461e58 to 0xc0462000) [ 69.830230] 1e40: bf2baaf5 c046fd98 [ 69.838806] 1e60: d94c1d74 00000000 00000008 da5cf0a4 c0461eec da484040 00000010 c08da280 [ 69.847381] 1e80: c08dee00 da5ce104 da5ce340 fc0ab100 00000008 fc0ab000 00000000 fc0ab100 [ 69.855987] 1ea0: 00000000 bf2a5e88 00000000 0900e2a0 00000001 c0460000 00000000 da5ce104 [ 69.864562] 1ec0: 00000008 00000099 00000099 c0465f00 00000000 bf2a5180 da5ce104 00000008 [ 69.873168] 1ee0: 00000000 da5ce104 60000093 c0461fac c0465f00 00000000 00000000 bf2a52a0 [ 69.881744] 1f00: da61c220 0000007c fa240100 c008c0e8 60000093 00000010 3c72f18c 00000000 [ 69.890350] 1f20: 411fc092 c0465f00 c0465f54 fa240100 c0461fac 8000406a 411fc092 00000000 [ 69.898925] 1f40: 00000000 c008c2c0 c0465f00 00000000 fa240100 c008e5c0 0000007c c008ba60 [ 69.907501] 1f60: 0000019a c000e7c8 c000ea0c c000ea10 60000013 c000d3b8 00000000 00000000 [ 69.916076] 1f80: c0461fc0 00000000 c0460000 c04c6b84 c02f6570 c047329c 8000406a 411fc092 [ 69.924682] 1fa0: 00000000 00000000 60000013 c0461fc0 c000ea0c c000ea10 60000013 ffffffff [ 69.933258] 1fc0: c000e9ec c000ebe4 c046fbb4 00000000 c08d7920 c041f790 c041f1bc 00000ae7 [ 69.941833] 1fe0: 80000100 c044cefc 10c5387d c046ef8c c044cef8 80008040 00000000 00000000 [ 69.950500] [<bf2b7d90>] (composite_setup+0x6b0/0xa34 [g_ether]) from [<bf2a5e88>] (musb_g_ep0_irq+0x7c8/0x888 [musb_hdrc]) [ 69.962188] [<bf2a5e88>] (musb_g_ep0_irq+0x7c8/0x888 [musb_hdrc]) from [<bf2a5180>] (musb_interrupt+0x710/0x7d8 [musb_hdrc]) [ 69.973968] [<bf2a5180>] (musb_interrupt+0x710/0x7d8 [musb_hdrc]) from [<bf2a52a0>] (generic_interrupt+0x58/0x70 [musb_hdrc]) [ 69.985900] [<bf2a52a0>] (generic_interrupt+0x58/0x70 [musb_hdrc]) from [<c008c0e8>] (handle_irq_event_percpu+0x7c/0x214) [ 69.997406] [<c008c0e8>] (handle_irq_event_percpu+0x7c/0x214) from [<c008c2c0>] (handle_irq_event+0x40/0x60) [ 70.007720] [<c008c2c0>] (handle_irq_event+0x40/0x60) from [<c008e5c0>] (handle_fasteoi_irq+0xc4/0x10c) [ 70.017578] [<c008e5c0>] (handle_fasteoi_irq+0xc4/0x10c) from [<c008ba60>] (generic_handle_irq+0x2c/0x40) [ 70.027648] [<c008ba60>] (generic_handle_irq+0x2c/0x40) from [<c000e7c8>] (handle_IRQ+0x78/0xb8) [ 70.036865] [<c000e7c8>] (handle_IRQ+0x78/0xb8) from [<c000d3b8>] (__irq_svc+0x38/0x100) [ 70.045379] [<c000d3b8>] (__irq_svc+0x38/0x100) from [<c000ea10>] (default_idle+0x24/0x28) [ 70.054046] [<c000ea10>] (default_idle+0x24/0x28) from [<c000ebe4>] (cpu_idle+0x8c/0xe4) [ 70.062561] [<c000ebe4>] (cpu_idle+0x8c/0xe4) from [<c041f790>] (start_kernel+0x2b8/0x310) [ 70.071228] Code: e18201a1 e1a01005 eb3b96f4 e59dc008 (e4982004) [ 70.077606] ---[ end trace fe6fb50eed7e07a8 ]--- [ 70.082458] Kernel panic - not syncing: Fatal exception in interrupt [ 70.089141] [<c001410c>] (unwind_backtrace+0x0/0xe0) from [<c02ec168>] (panic+0x50/0x190) [ 70.097717] [<c02ec168>] (panic+0x50/0x190) from [<c00116d4>] (die+0x2ac/0x2fc) [ 70.105407] [<c00116d4>] (die+0x2ac/0x2fc) from [<c02ebef8>] (__do_kernel_fault.part.3+0x54/0x74) [ 70.114746] [<c02ebef8>] (__do_kernel_fault.part.3+0x54/0x74) from [<c0016d14>] (do_page_fault+0x278/0x294) [ 70.124969] [<c0016d14>] (do_page_fault+0x278/0x294) from [<c0008624>] (do_DataAbort+0x34/0x98) [ 70.134094] [<c0008624>] (do_DataAbort+0x34/0x98) from [<c000d358>] (__dabt_svc+0x38/0x60) [ 70.142761] Exception stack(0xc0461e10 to 0xc0461e58) [ 70.148071] 1e00: 00000047 c03c64d2 c0461e14 d9dd52a8 [ 70.156646] 1e20: da630c60 d9dd52a8 bf2bb274 da5cf0a4 00000000 d9dd5260 00000000 bf2bb274 [ 70.165222] 1e40: d9678160 c0461e58 bf2b7d10 bf2b7d90 60000093 ffffffff [ 70.172180] [<c000d358>] (__dabt_svc+0x38/0x60) from [<bf2b7d90>] (composite_setup+0x6b0/0xa34 [g_ether]) [ 70.182250] [<bf2b7d90>] (composite_setup+0x6b0/0xa34 [g_ether]) from [<bf2a5e88>] (musb_g_ep0_irq+0x7c8/0x888 [musb_hdrc]) [ 70.193939] [<bf2a5e88>] (musb_g_ep0_irq+0x7c8/0x888 [musb_hdrc]) from [<bf2a5180>] (musb_interrupt+0x710/0x7d8 [musb_hdrc]) [ 70.205718] [<bf2a5180>] (musb_interrupt+0x710/0x7d8 [musb_hdrc]) from [<bf2a52a0>] (generic_interrupt+0x58/0x70 [musb_hdrc]) [ 70.217590] [<bf2a52a0>] (generic_interrupt+0x58/0x70 [musb_hdrc]) from [<c008c0e8>] (handle_irq_event_percpu+0x7c/0x214) [ 70.229095] [<c008c0e8>] (handle_irq_event_percpu+0x7c/0x214) from [<c008c2c0>] (handle_irq_event+0x40/0x60) [ 70.239410] [<c008c2c0>] (handle_irq_event+0x40/0x60) from [<c008e5c0>] (handle_fasteoi_irq+0xc4/0x10c) [ 70.249267] [<c008e5c0>] (handle_fasteoi_irq+0xc4/0x10c) from [<c008ba60>] (generic_handle_irq+0x2c/0x40) [ 70.259338] [<c008ba60>] (generic_handle_irq+0x2c/0x40) from [<c000e7c8>] (handle_IRQ+0x78/0xb8) [ 70.268554] [<c000e7c8>] (handle_IRQ+0x78/0xb8) from [<c000d3b8>] (__irq_svc+0x38/0x100) [ 70.277038] [<c000d3b8>] (__irq_svc+0x38/0x100) from [<c000ea10>] (default_idle+0x24/0x28) [ 70.285705] [<c000ea10>] (default_idle+0x24/0x28) from [<c000ebe4>] (cpu_idle+0x8c/0xe4) [ 70.294219] [<c000ebe4>] (cpu_idle+0x8c/0xe4) from [<c041f790>] (start_kernel+0x2b8/0x310) [ 70.302917] CPU1: stopping [ 70.305755] [<c001410c>] (unwind_backtrace+0x0/0xe0) from [<c0008578>] (do_IPI+0xc0/0x138) [ 70.314422] [<c0008578>] (do_IPI+0xc0/0x138) from [<c000d3b8>] (__irq_svc+0x38/0x100) [ 70.322631] Exception stack(0xda469f98 to 0xda469fe0) [ 70.327941] 9f80: 00000000 00000000 [ 70.336517] 9fa0: da469fe0 00000000 da468000 c04c6b84 c02f6570 c04c6d18 8000406a 411fc092 [ 70.345123] 9fc0: 00000000 00000000 60000113 da469fe0 c000ea0c c000ea10 60000113 ffffffff [ 70.353698] [<c000d3b8>] (__irq_svc+0x38/0x100) from [<c000ea10>] (default_idle+0x24/0x28) [ 70.362365] [<c000ea10>] (default_idle+0x24/0x28) from [<c000ebe4>] (cpu_idle+0x8c/0xe4) [ 70.370880] [<c000ebe4>] (cpu_idle+0x8c/0xe4) from [<802e8654>] (0x802e8654)
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