8<--- cut here --- Unable to handle kernel paging request at virtual address fee00080 when write [fee00080] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 4247 Comm: syz.1.78 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 : [<813ab6a0>] lr : [<813ab690>] psr: 60000013 sp : dfa85d30 ip : dfa85d30 fp : dfa85d54 r10: 82b16f00 r9 : 00000003 r8 : 840e2480 r7 : dfa85d90 r6 : 840e2480 r5 : 00000000 r4 : 00000000 r3 : fee00080 r2 : 81e15364 r1 : 00000001 r0 : 813ab310 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 854734c0 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 840e2480 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfa84000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r8 information: slab kmalloc-192 start 840e2480 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 0xdfa84000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfa84000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.1.78 (pid: 4247, stack limit = 0xdfa84000) Stack: (0xdfa85d30 to 0xdfa86000) 5d20: 823fe2b4 840e2480 829cf92c 829cf92c 5d40: 81e15824 840e24c4 dfa85d8c dfa85d58 813a7738 813ab538 20000080 00000000 5d60: dfa85d7c 20000080 840e2480 b5403587 20000080 83a90c00 40946400 00000000 5d80: dfa85e4c dfa85d90 813a32b8 813a763c 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00000080 80008000 00000009 00000002 0000002f 00000000 00000000 5dc0: 0000000d 00000ffe 00000001 00000007 00000001 00000006 00000002 0000ffff 5de0: 0000ffff ffffffa8 4000000c 00000000 00000003 00000004 00010000 00000100 5e00: 0000e2df 00000002 00000008 00000005 00000003 00000005 00000004 00028047 5e20: 00000000 fa9e823e 00000000 85472e40 840e2480 20000080 20000080 83a90c00 5e40: dfa85f14 dfa85e50 813a4284 813a31c4 00000000 00000000 00000000 fa9e823e 5e60: 00000000 00000000 8247054c 0000005f 8405f258 840e24b0 840e0c24 83a90c00 5e80: dfa85ee4 dfa85e90 80797a1c 8078dd80 00000064 00000001 00000000 dfa85eac 5ea0: 859c2e50 83432d48 00006400 0000000b dfa85ea0 00000000 00000000 fa9e823e 5ec0: 85472e40 40946400 20000080 20000080 85472e40 00000003 dfa85ef4 dfa85ee8 5ee0: 80797b3c fa9e823e dfa85f14 40946400 00000000 85472e41 20000080 85472e40 5f00: 00000003 83a90c00 dfa85fa4 dfa85f18 8056cd60 813a3cb4 ecac8b10 83a90c00 5f20: dfa85f3c dfa85f30 81a394f8 81a393c8 dfa85f54 dfa85f40 8025e490 8028ef64 5f40: dfa85fb0 40000000 dfa85f84 dfa85f58 802229ec 8025e44c 00000000 8281cddc 5f60: dfa85fb0 0014c820 ecac8b10 80222940 00000000 fa9e823e dfa85fac 00000000 5f80: 00000000 002f6308 00000036 8020029c 83a90c00 00000036 00000000 dfa85fa8 5fa0: 80200060 8056cc3c 00000000 00000000 00000003 40946400 20000080 00000000 5fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76fa50bc 5fe0: 76fa4ec0 76fa4eb0 0001948c 001322c0 60000010 00000003 00000000 00000000 Call trace: [<813ab52c>] (parport_attach) from [<813a7738>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1006) r6:840e24c4 r5:81e15824 r4:829cf92c [<813a7630>] (comedi_device_attach) from [<813a32b8>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000000 r9:40946400 r8:83a90c00 r7:20000080 r6:b5403587 r5:840e2480 r4:20000080 [<813a31b8>] (do_devconfig_ioctl) from [<813a4284>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2173) r8:83a90c00 r7:20000080 r6:20000080 r5:840e2480 r4:85472e40 [<813a3ca8>] (comedi_unlocked_ioctl) from [<8056cd60>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a3ca8>] (comedi_unlocked_ioctl) from [<8056cd60>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a3ca8>] (comedi_unlocked_ioctl) from [<8056cd60>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a3ca8>] (comedi_unlocked_ioctl) from [<8056cd60>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:83a90c00 r9:00000003 r8:85472e40 r7:20000080 r6:85472e41 r5:00000000 r4:40946400 [<8056cc30>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa85fa8 to 0xdfa85ff0) 5fa0: 00000000 00000000 00000003 40946400 20000080 00000000 5fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76fa50bc 5fe0: 76fa4ec0 76fa4eb0 0001948c 001322c0 r10:00000036 r9:83a90c00 r8:8020029c r7:00000036 r6:002f6308 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