8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f27 when write [fee04f27] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 4113 Comm: syz.0.42 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 : [<813ce700>] lr : [<813ce6f0>] psr: 60000013 sp : ea8d5d30 ip : ea8d5d30 fp : ea8d5d54 r10: 82b25910 r9 : 00000003 r8 : 841769c0 r7 : ea8d5d90 r6 : 841769c0 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e1773c r1 : 00000001 r0 : 813ce370 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 8589a980 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 841769c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xea8d4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 841769c0 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 0xea8d4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xea8d4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.0.42 (pid: 4113, stack limit = 0xea8d4000) Stack: (0xea8d5d30 to 0xea8d6000) 5d20: 823f12ec 841769c0 829d1bf4 829d1bf4 5d40: 81e17bfc 84176a04 ea8d5d8c ea8d5d58 813ca790 813ce598 200000c0 00000000 5d60: ea8d5d7c 200000c0 841769c0 b5403587 200000c0 8553a400 40946400 00000003 5d80: ea8d5e4c ea8d5d90 813c62dc 813ca694 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00004f27 00000105 00000002 0000041f 00000001 00000cc7 7fffffff 5dc0: 5c952399 00000005 000003ff 00000002 00800300 00000001 00000001 00000009 5de0: 00000000 00000000 00000008 fffffffa 00000009 80000089 00000009 00400000 5e00: 00000001 ffffeade 00000003 00000f52 00000008 00000004 08000000 0000485b 5e20: 00000000 d528b476 00000000 8474ef00 841769c0 200000c0 200000c0 8553a400 5e40: ea8d5f14 ea8d5e50 813c72a8 813c61e8 00000000 00000000 00000000 d528b476 5e60: 00000000 00000000 824625b4 0000005f 83ce3210 841769f0 841a709c 8553a400 5e80: ea8d5ee4 ea8d5e90 807a7684 8079da7c 00000064 00000001 00000000 ea8d5eac 5ea0: 85805550 8342dc38 00006400 0000000b ea8d5ea0 00000000 00000000 d528b476 5ec0: 8474ef00 40946400 200000c0 200000c0 8474ef00 00000003 ea8d5ef4 ea8d5ee8 5ee0: 807a77a4 d528b476 ea8d5f14 40946400 00000000 8474ef01 200000c0 8474ef00 5f00: 00000003 8553a400 ea8d5fa4 ea8d5f18 805788b8 813c6cd8 ecac8b10 8553a400 5f20: ea8d5f3c ea8d5f30 81a60b38 81a60a08 ea8d5f54 ea8d5f40 8025c484 8028d914 5f40: ea8d5fb0 40000000 ea8d5f84 ea8d5f58 802229ec 8025c440 00000000 8281cfb4 5f60: ea8d5fb0 0014ced0 ecac8b10 80222940 00000000 d528b476 ea8d5fac 00000000 5f80: 00000000 00316308 00000036 8020029c 8553a400 00000036 00000000 ea8d5fa8 5fa0: 80200060 80578794 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76ffb0bc 5fe0: 76ffaec0 76ffaeb0 0001928c 00132970 60000010 00000003 00000000 00000000 Call trace: [<813ce58c>] (parport_attach) from [<813ca790>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:84176a04 r5:81e17bfc r4:829d1bf4 [<813ca688>] (comedi_device_attach) from [<813c62dc>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:8553a400 r7:200000c0 r6:b5403587 r5:841769c0 r4:200000c0 [<813c61dc>] (do_devconfig_ioctl) from [<813c72a8>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:8553a400 r7:200000c0 r6:200000c0 r5:841769c0 r4:8474ef00 [<813c6ccc>] (comedi_unlocked_ioctl) from [<805788b8>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c6ccc>] (comedi_unlocked_ioctl) from [<805788b8>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c6ccc>] (comedi_unlocked_ioctl) from [<805788b8>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c6ccc>] (comedi_unlocked_ioctl) from [<805788b8>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:8553a400 r9:00000003 r8:8474ef00 r7:200000c0 r6:8474ef01 r5:00000000 r4:40946400 [<80578788>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea8d5fa8 to 0xea8d5ff0) 5fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76ffb0bc 5fe0: 76ffaec0 76ffaeb0 0001928c 00132970 r10:00000036 r9:8553a400 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