8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f23 when write [fee04f23] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 4026 Comm: syz.2.17 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 : [<81401184>] lr : [<81401174>] psr: 60000013 sp : ea461d30 ip : ea461d30 fp : ea461d54 r10: 82b28b30 r9 : 00000003 r8 : 84577240 r7 : ea461d90 r6 : 84577240 r5 : 00000000 r4 : 00000000 r3 : fee04f23 r2 : 81e24f44 r1 : 00000001 r0 : 81400df4 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 859ac340 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:1055 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 84577240 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xea460000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Register r8 information: slab kmalloc-192 start 84577240 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 0xea460000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xea460000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Process syz.2.17 (pid: 4026, stack limit = 0xea460000) Stack: (0xea461d30 to 0xea462000) 1d20: 8243d0ec 84577240 829d3948 829d3948 1d40: 81e25404 00000000 ea461d8c ea461d58 813fcdb0 8140101c 40946400 00000000 1d60: ea461d7c 200000c0 84577240 b5403587 40946400 85b03c00 00000003 84577270 1d80: ea461e4c ea461d90 813f86e0 813fccb0 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00004f23 00000005 00000002 04000401 00000001 40000cc7 00000fff 1dc0: 5c952399 00000005 000003ff 00000802 00000008 00010001 00000001 00000009 1de0: 0000e1cb 00000006 00000401 00000003 00000395 80000089 fffffffd 00000032 1e00: fffffff5 ffffeadb 00000007 0000003c 00000008 00000003 08000000 00002ec0 1e20: 00000000 b760f551 00000000 84dafe40 84577240 200000c0 40946400 85b03c00 1e40: ea461f14 ea461e50 813f9260 813f8618 00000000 b760f551 00000000 00000000 1e60: 824b15ec ea461ea4 0000005f 83fdbbe8 00000064 844e051c ea461ee4 ea461e88 1e80: 807b404c 807aa6c8 00000064 00000001 00000000 ea461ea4 85a10550 83424088 1ea0: 00006400 0000000b ea461e98 00000000 00000000 b760f551 ea461f24 84dafe40 1ec0: 40946400 200000c0 200000c0 84dafe40 00000003 85b03c00 ea461ef4 ea461ee8 1ee0: 807b417c b760f551 ea461f14 00000000 84dafe40 40946400 200000c0 84dafe40 1f00: 00000003 85b03c00 ea461fa4 ea461f18 8058223c 813f9168 ea461f4c ea461f28 1f20: 8034b6ac 8034ea2c 80233e34 804d7224 ea461f54 ea461f40 8025ba7c 00000004 1f40: ea461fa4 ea461f50 8034bfcc 8034b5e8 00000000 00000004 ffffffff 80233c18 1f60: 00000000 00000000 00000000 00000000 00000000 b760f551 ea461fac 00000000 1f80: 00000000 00346310 00000036 8020029c 85b03c00 00000036 00000000 ea461fa8 1fa0: 80200060 80582004 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 003462d8 003462e4 1fe0: 7ed0e790 7ed0e780 00018734 0012fc20 60000010 00000003 00000000 00000000 Call trace: [<81401010>] (parport_attach) from [<813fcdb0>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r6:00000000 r5:81e25404 r4:829d3948 [<813fcca4>] (comedi_device_attach) from [<813f86e0>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:84577270 r9:00000003 r8:85b03c00 r7:40946400 r6:b5403587 r5:84577240 r4:200000c0 [<813f860c>] (do_devconfig_ioctl) from [<813f9260>] (comedi_unlocked_ioctl+0x104/0x1c88 drivers/comedi/comedi_fops.c:2240) r8:85b03c00 r7:40946400 r6:200000c0 r5:84577240 r4:84dafe40 [<813f915c>] (comedi_unlocked_ioctl) from [<8058223c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813f915c>] (comedi_unlocked_ioctl) from [<8058223c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813f915c>] (comedi_unlocked_ioctl) from [<8058223c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813f915c>] (comedi_unlocked_ioctl) from [<8058223c>] (sys_ioctl+0x244/0xb58 fs/ioctl.c:583) r10:85b03c00 r9:00000003 r8:84dafe40 r7:200000c0 r6:40946400 r5:84dafe40 r4:00000000 [<80581ff8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea461fa8 to 0xea461ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 003462d8 003462e4 1fe0: 7ed0e790 7ed0e780 00018734 0012fc20 r10:00000036 r9:85b03c00 r8:8020029c r7:00000036 r6:00346310 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