8<--- cut here --- Unable to handle kernel paging request at virtual address fee01610 when write [fee01610] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 31929 Comm: syz.0.12528 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 : [<813ce650>] lr : [<813ce640>] psr: 60000013 sp : e822dd30 ip : e822dd30 fp : e822dd54 r10: 82b25910 r9 : 00000003 r8 : 841459c0 r7 : e822dd90 r6 : 841459c0 r5 : 00000000 r4 : 00000000 r3 : fee01610 r2 : 81e177dc r1 : 00000001 r0 : 813ce2c0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85312ec0 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 841459c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xe822c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 841459c0 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 0xe822c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xe822c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.0.12528 (pid: 31929, stack limit = 0xe822c000) Stack: (0xe822dd30 to 0xe822e000) dd20: e822dd4c e822dd40 829d1bf4 829d1bf4 dd40: 81e17c9c 84145a04 e822dd8c e822dd58 813ca6e0 813ce4e8 200000c0 00000000 dd60: e822dd7c 200000c0 841459c0 b5403587 200000c0 852f3c00 40946400 00000003 dd80: e822de4c e822dd90 813c622c 813ca5e4 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 00001610 00000000 00000001 00000000 00000003 00000cc7 00000009 ddc0: 00000aab 0000000a 00000100 00000002 00000001 00000008 01100004 00000006 dde0: 00000009 00000001 0001a449 00000003 40000003 00000089 00000002 00000f27 de00: 00000006 0000800b 00000ca8 00000005 00000004 00000400 00010000 fffffff7 de20: 00000000 1b880aba 00000000 860d76c0 841459c0 200000c0 200000c0 852f3c00 de40: e822df14 e822de50 813c71f8 813c6138 00000000 00000000 00000000 1b880aba de60: 00000000 00000000 824625b4 0000005f 83f4e250 841459f0 8416951c 852f3c00 de80: e822dee4 e822de90 807a766c 8079da64 00000064 00000001 00000000 e822deac dea0: 89c773d0 83429770 00006400 0000000b e822dea0 00000000 00000000 1b880aba dec0: 860d76c0 40946400 200000c0 200000c0 860d76c0 00000003 e822def4 e822dee8 dee0: 807a778c 1b880aba e822df14 40946400 00000000 860d76c1 200000c0 860d76c0 df00: 00000003 852f3c00 e822dfa4 e822df18 805788a0 813c6c28 ecac8b10 852f3c00 df20: e822df3c e822df30 81a60a38 81a60908 e822df54 e822df40 8025c484 8028d914 df40: e822dfb0 40000000 e822df84 e822df58 802229ec 8025c440 00000000 8281cfb4 df60: e822dfb0 0014ca70 ecac8b10 80222940 00000000 1b880aba e822dfac 00000000 df80: 00000000 00316308 00000036 8020029c 852f3c00 00000036 00000000 e822dfa8 dfa0: 80200060 8057877c 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f060bc dfe0: 76f05ec0 76f05eb0 000195a4 00132510 60000010 00000003 00000000 00000000 Call trace: [<813ce4dc>] (parport_attach) from [<813ca6e0>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:84145a04 r5:81e17c9c r4:829d1bf4 [<813ca5d8>] (comedi_device_attach) from [<813c622c>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:852f3c00 r7:200000c0 r6:b5403587 r5:841459c0 r4:200000c0 [<813c612c>] (do_devconfig_ioctl) from [<813c71f8>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:852f3c00 r7:200000c0 r6:200000c0 r5:841459c0 r4:860d76c0 [<813c6c1c>] (comedi_unlocked_ioctl) from [<805788a0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c6c1c>] (comedi_unlocked_ioctl) from [<805788a0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c6c1c>] (comedi_unlocked_ioctl) from [<805788a0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c6c1c>] (comedi_unlocked_ioctl) from [<805788a0>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:852f3c00 r9:00000003 r8:860d76c0 r7:200000c0 r6:860d76c1 r5:00000000 r4:40946400 [<80578770>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe822dfa8 to 0xe822dff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f060bc dfe0: 76f05ec0 76f05eb0 000195a4 00132510 r10:00000036 r9:852f3c00 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