8<--- cut here --- Unable to handle kernel paging request at virtual address fee00101 when write [fee00101] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 22444 Comm: syz.6.4098 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: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 : [<81408d38>] lr : [<81408d28>] psr: 60000013 sp : df9d5d28 ip : df9d5d28 fp : df9d5d4c r10: 82b28ad8 r9 : 00000003 r8 : 8449cf00 r7 : df9d5d88 r6 : 8449cf00 r5 : 00000000 r4 : 00000000 r3 : fee00101 r2 : 81e1a2b8 r1 : 00000001 r0 : 814089a8 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 8664c7c0 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 8449cf00 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdf9d4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r8 information: slab kmalloc-192 start 8449cf00 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 0xdf9d4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xdf9d4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.6.4098 (pid: 22444, stack limit = 0xdf9d4000) Stack: (0xdf9d5d28 to 0xdf9d6000) 5d20: 82432e8c 8449cf00 829d3f08 829d3f08 81e1a778 8449cf44 5d40: df9d5d84 df9d5d50 814049e0 81408bd0 8449cf30 00000000 df9d5d74 200000c0 5d60: 8449cf00 b5403587 8449cf30 845a2400 40946400 00000000 df9d5e44 df9d5d88 5d80: 81400338 814048e4 656d6f63 705f6964 6f707261 00007472 00000000 00000101 5da0: 80000004 40010080 00005149 00000008 00000006 00000fff 00000000 ffffffff 5dc0: 00000100 00000401 00000001 0000000d 00000003 00000000 1bfffffe 00000000 5de0: 0001a449 00000003 40000003 00000085 ffdffffb 00000000 00000003 00400002 5e00: 00000005 00009ee0 00000004 00000106 00000007 00000000 00000000 fff34bbb 5e20: 00000000 85790000 8449cf00 200000c0 8449cf30 845a2400 df9d5f14 df9d5e48 5e40: 8140132c 81400244 00000000 00000000 00000000 00000000 00000000 fff34bbb 5e60: 00000000 00000000 824a35ec 0000005f 83ff17f8 00000064 844c012c 845a2400 5e80: df9d5ee4 df9d5e90 807b7f80 807ae4a4 00000064 00000001 00000000 df9d5eac 5ea0: 84c5d790 834e75d8 00006400 0000000b df9d5ea0 00000000 00000000 fff34bbb 5ec0: 85790000 40946400 200000c0 200000c0 85790000 00000003 df9d5ef4 df9d5ee8 5ee0: 807b80a0 fff34bbb df9d5f14 40946400 00000000 85790001 200000c0 85790000 5f00: 00000003 845a2400 df9d5fa4 df9d5f18 80585608 81400d7c ecac8b10 845a2400 5f20: df9d5f3c df9d5f30 81aaf9ac 81aaf87c df9d5f54 df9d5f40 8025bcbc 8028e0c4 5f40: df9d5fb0 40000000 df9d5f84 df9d5f58 80221a38 8025bc78 00000000 8281d17c 5f60: df9d5fb0 0014c8c0 ecac8b10 8022198c 00000000 fff34bbb df9d5fac 00000000 5f80: 00000000 00326310 00000036 8020029c 845a2400 00000036 00000000 df9d5fa8 5fa0: 80200060 805854e4 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f9b0bc 5fe0: 76f9aec0 76f9aeb0 000192bc 00132360 60000010 00000003 00000000 00000000 Call trace: [<81408bc4>] (parport_attach) from [<814049e0>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r6:8449cf44 r5:81e1a778 r4:829d3f08 [<814048d8>] (comedi_device_attach) from [<81400338>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000000 r9:40946400 r8:845a2400 r7:8449cf30 r6:b5403587 r5:8449cf00 r4:200000c0 [<81400238>] (do_devconfig_ioctl) from [<8140132c>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:845a2400 r7:8449cf30 r6:200000c0 r5:8449cf00 r4:85790000 [<81400d70>] (comedi_unlocked_ioctl) from [<80585608>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81400d70>] (comedi_unlocked_ioctl) from [<80585608>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81400d70>] (comedi_unlocked_ioctl) from [<80585608>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81400d70>] (comedi_unlocked_ioctl) from [<80585608>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:845a2400 r9:00000003 r8:85790000 r7:200000c0 r6:85790001 r5:00000000 r4:40946400 [<805854d8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf9d5fa8 to 0xdf9d5ff0) 5fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f9b0bc 5fe0: 76f9aec0 76f9aeb0 000192bc 00132360 r10:00000036 r9:845a2400 r8:8020029c r7:00000036 r6:00326310 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