8<--- cut here --- Unable to handle kernel paging request at virtual address fee08001 when write [fee08001] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 7224 Comm: syz.0.825 Not tainted syzkaller #0 PREEMPT 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:289 [inline] PC is at parport_attach+0x174/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:289 [inline] LR is at parport_attach+0x164/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 pc : [<813cb680>] lr : [<813cb670>] psr: 60000013 sp : dfbe5d30 ip : dfbe5d30 fp : dfbe5d54 r10: 82b24900 r9 : 00000003 r8 : 840eec00 r7 : dfbe5d90 r6 : 840eec00 r5 : 00000000 r4 : 00000000 r3 : fee08001 r2 : 81e1765c r1 : 00000001 r0 : 813cb2f0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 84853cc0 DAC: 00000000 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:1055 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 840eec00 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfbe4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 840eec00 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 0xdfbe4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xdfbe4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.0.825 (pid: 7224, stack limit = 0xdfbe4000) Stack: (0xdfbe5d30 to 0xdfbe6000) 5d20: 823eccd0 840eec00 829d1b3c 829d1b3c 5d40: 81e17b1c 840eec44 dfbe5d8c dfbe5d58 813c770c 813cb518 20000180 00000000 5d60: dfbe5d7c 20000180 840eec00 b5403587 20000180 859fe000 40946400 00000003 5d80: dfbe5e4c dfbe5d90 813c3258 813c7610 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00008001 00000007 00000004 00000000 00010001 00000cc7 00010001 5dc0: 00800004 0000000a 000000ff 00000c4f 00000001 00000008 01100004 00000006 5de0: 0000000a 00000008 00000007 00000043 40000003 0000000c 00000002 00000f27 5e00: 00000006 0000800b 00000008 00000005 00000005 00000008 00000004 0000000c 5e20: 00000000 bc72a837 00000000 84ea86c0 840eec00 20000180 20000180 859fe000 5e40: dfbe5f14 dfbe5e50 813c4224 813c3164 00000000 00000000 00000000 bc72a837 5e60: 00000000 00000000 8245d5b4 0000005f 84061be8 840eec30 84139b04 859fe000 5e80: dfbe5ee4 dfbe5e90 807a5ffc 8079c3f4 00000064 00000001 00000000 dfbe5eac 5ea0: 8586b610 834355d8 00006400 0000000b dfbe5ea0 00000000 00000000 bc72a837 5ec0: 84ea86c0 40946400 20000180 20000180 84ea86c0 00000003 dfbe5ef4 dfbe5ee8 5ee0: 807a611c bc72a837 dfbe5f14 40946400 00000000 84ea86c1 20000180 84ea86c0 5f00: 00000003 859fe000 dfbe5fa4 dfbe5f18 80577e20 813c3c54 ecac8b10 859fe000 5f20: dfbe5f3c dfbe5f30 81a36318 81a361e8 dfbe5f54 dfbe5f40 8025c478 8028d90c 5f40: dfbe5fb0 40000000 dfbe5f84 dfbe5f58 802229ec 8025c434 00000000 8281cf74 5f60: dfbe5fb0 0014ca70 ecac8b10 80222940 00000000 bc72a837 dfbe5fac 00000000 5f80: 00000000 00316308 00000036 8020029c 859fe000 00000036 00000000 dfbe5fa8 5fa0: 80200060 80577cfc 00000000 00000000 00000003 40946400 20000180 00000000 5fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76fd70bc 5fe0: 76fd6ec0 76fd6eb0 000195a4 00132510 60000010 00000003 00000000 00000000 Call trace: [<813cb50c>] (parport_attach) from [<813c770c>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:840eec44 r5:81e17b1c r4:829d1b3c [<813c7604>] (comedi_device_attach) from [<813c3258>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:859fe000 r7:20000180 r6:b5403587 r5:840eec00 r4:20000180 [<813c3158>] (do_devconfig_ioctl) from [<813c4224>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:859fe000 r7:20000180 r6:20000180 r5:840eec00 r4:84ea86c0 [<813c3c48>] (comedi_unlocked_ioctl) from [<80577e20>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c3c48>] (comedi_unlocked_ioctl) from [<80577e20>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c3c48>] (comedi_unlocked_ioctl) from [<80577e20>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c3c48>] (comedi_unlocked_ioctl) from [<80577e20>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:859fe000 r9:00000003 r8:84ea86c0 r7:20000180 r6:84ea86c1 r5:00000000 r4:40946400 [<80577cf0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfbe5fa8 to 0xdfbe5ff0) 5fa0: 00000000 00000000 00000003 40946400 20000180 00000000 5fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76fd70bc 5fe0: 76fd6ec0 76fd6eb0 000195a4 00132510 r10:00000036 r9:859fe000 r8:8020029c r7:00000036 r6:00316308 r5:00000000 r4:00000000 Code: e596306c e3a04000 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e596306c ldr r3, [r6, #108] @ 0x6c 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