UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy misc raw-gadget: fail, usb_gadget_register_driver returned -16 8<--- cut here --- Unable to handle kernel paging request at virtual address fee00400 when write [fee00400] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 29334 Comm: syz.8.4393 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: ARM-Versatile Express PC is at __raw_writeb arch/arm/include/asm/io.h:88 [inline] PC is at parport_attach drivers/comedi/drivers/comedi_parport.c:291 [inline] PC is at parport_attach+0x184/0x1e0 drivers/comedi/drivers/comedi_parport.c:224 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:291 [inline] LR is at parport_attach+0x174/0x1e0 drivers/comedi/drivers/comedi_parport.c:224 pc : [<8145b874>] lr : [<8145b864>] psr: 60000113 sp : df9c5d30 ip : df9c5d30 fp : df9c5d54 r10: 82d29754 r9 : 00000003 r8 : 845c8e40 r7 : df9c5d90 r6 : 845c8e40 r5 : 00000000 r4 : 00000000 r3 : fee00400 r2 : 81e27308 r1 : 00000001 r0 : 8145b4d4 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 86dd5d00 DAC: fffffffd Register r0 information: non-slab/vmalloc memory Register r1 information: non-paged memory Register r2 information: non-slab/vmalloc memory Register r3 information: 0-page vmalloc region starting at 0xfee00000 allocated at pci_reserve_io+0x0/0x38 arch/arm/mm/mmu.c:1048 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 845c8e40 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdf9c4000 allocated at kernel_clone+0xc4/0x444 kernel/fork.c:2722 Register r8 information: slab kmalloc-192 start 845c8e40 pointer offset 0 size 192 Register r9 information: non-paged memory Register r10 information: non-slab/vmalloc memory Register r11 information: 2-page vmalloc region starting at 0xdf9c4000 allocated at kernel_clone+0xc4/0x444 kernel/fork.c:2722 Register r12 information: 2-page vmalloc region starting at 0xdf9c4000 allocated at kernel_clone+0xc4/0x444 kernel/fork.c:2722 Process syz.8.4393 (pid: 29334, stack limit = 0xdf9c4000) Stack: (0xdf9c5d30 to 0xdf9c6000) 5d20: 824bcb94 845c8e40 00000000 82bd2368 5d40: 81e277c8 00000000 df9c5d8c df9c5d58 814573f0 8145b6fc 40946400 00000000 5d60: df9c5d7c 20000140 845c8e40 b5403587 40946400 00000001 00000003 84554b00 5d80: df9c5e4c df9c5d90 81452bfc 814572f4 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00000400 00000002 7fffffff 000084e1 0000002f 00002006 00000006 5dc0: 00000008 000a0ffa 00000000 00000007 00000002 00001003 01000004 0000000f 5de0: 00010000 ffffffa8 7ffbfffd 000001ff 0000ecd0 00000010 0003fffe 00000008 5e00: 00000007 0000746f 00000004 00000005 00000408 00000004 00000000 00007ffd 5e20: 00000000 f9e2110f 00000000 86377000 845c8e40 20000140 40946400 00000001 5e40: df9c5f14 df9c5e50 81453f20 81452b34 00000000 f9e2110f 00000000 00000000 5e60: 82531804 df9c5ea4 0000005f 84140b68 00000064 845c8e70 df9c5ee4 df9c5e88 5e80: 807eaa5c 807e0d70 00000064 00000001 00000000 df9c5ea4 838adb50 83424550 5ea0: 00006400 0000000b df9c5e98 00000000 00000000 f9e2110f 00000000 86377000 5ec0: 40946400 20000140 20000140 86377000 00000003 84554b00 df9c5ef4 df9c5ee8 5ee0: 807eab90 f9e2110f df9c5f14 00000000 86377000 40946400 20000140 86377000 5f00: 00000003 84554b00 df9c5fa4 df9c5f18 805a2310 81453bd8 ecac8b10 84554b00 5f20: df9c5f3c df9c5f30 81b1b254 81b1b120 df9c5f54 df9c5f40 8025a6ac 8028e2e4 5f40: df9c5fb0 40000000 df9c5f84 df9c5f58 80220be0 8025a668 00000000 82a1c63c 5f60: df9c5fb0 0013e9b0 ecac8b10 80220b34 00000000 f9e2110f df9c5fac 00000000 5f80: 00000000 00346310 00000036 8020029c 84554b00 00000036 00000000 df9c5fa8 5fa0: 80200060 805a20d8 00000000 00000000 00000003 40946400 20000140 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f5c0dc 5fe0: 76f5be88 76f5be78 00018ebc 00130810 60000010 00000003 00000000 00000000 Call trace: [<8145b6f0>] (parport_attach) from [<814573f0>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e277c8 r4:82bd2368 [<814572e8>] (comedi_device_attach) from [<81452bfc>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:84554b00 r9:00000003 r8:00000001 r7:40946400 r6:b5403587 r5:845c8e40 r4:20000140 [<81452b28>] (do_devconfig_ioctl) from [<81453f20>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000001 r7:40946400 r6:20000140 r5:845c8e40 r4:86377000 [<81453bcc>] (comedi_unlocked_ioctl) from [<805a2310>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81453bcc>] (comedi_unlocked_ioctl) from [<805a2310>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81453bcc>] (comedi_unlocked_ioctl) from [<805a2310>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81453bcc>] (comedi_unlocked_ioctl) from [<805a2310>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:84554b00 r9:00000003 r8:86377000 r7:20000140 r6:40946400 r5:86377000 r4:00000000 [<805a20cc>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf9c5fa8 to 0xdf9c5ff0) 5fa0: 00000000 00000000 00000003 40946400 20000140 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f5c0dc 5fe0: 76f5be88 76f5be78 00018ebc 00130810 r10:00000036 r9:84554b00 r8:8020029c r7:00000036 r6:00346310 r5:00000000 r4:00000000 Code: e5963064 e3a04000 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e5963064 ldr r3, [r6, #100] @ 0x64 4: e3a04000 mov r4, #0 8: e7f33053 ubfx r3, r3, #0, #20 c: e2433612 sub r3, r3, #18874368 @ 0x1200000 * 10: e5c34000 strb r4, [r3] <-- trapping instruction