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: 5032 Comm: syz.0.330 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 : [<813ab5e0>] lr : [<813ab5d0>] psr: 60000013 sp : dfa8dd30 ip : dfa8dd30 fp : dfa8dd54 r10: 82b16f00 r9 : 00000003 r8 : 840f9900 r7 : dfa8dd90 r6 : 840f9900 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e15364 r1 : 00000001 r0 : 813ab250 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85898540 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 840f9900 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfa8c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r8 information: slab kmalloc-192 start 840f9900 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 0xdfa8c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfa8c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.0.330 (pid: 5032, stack limit = 0xdfa8c000) Stack: (0xdfa8dd30 to 0xdfa8e000) dd20: dfa8dd4c dfa8dd40 829cf92c 829cf92c dd40: 81e15824 840f9944 dfa8dd8c dfa8dd58 813a7678 813ab478 200000c0 00000000 dd60: dfa8dd7c 200000c0 840f9900 b5403587 200000c0 84150000 40946400 00000003 dd80: dfa8de4c dfa8dd90 813a31f8 813a757c 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 00004f27 00000000 00000004 00000007 00000005 00000005 00000004 ddc0: 00000007 54c6cff3 000000fd 00000002 00008401 00000001 00000001 00000006 dde0: 00000101 00000000 0000007f 00000007 40000001 00000005 0000caa3 00000000 de00: 20001e5b 00000000 00000e66 00000003 00000008 00004086 00000000 fffffff8 de20: 00000000 1ba52a29 00000000 84e18b40 840f9900 200000c0 200000c0 84150000 de40: dfa8df14 dfa8de50 813a41c4 813a3104 00000000 00000000 00000000 1ba52a29 de60: 00000000 00000000 8247054c 0000005f 842ba458 840f9930 841e23b4 84150000 de80: dfa8dee4 dfa8de90 80797934 8078dc98 00000064 00000001 00000000 dfa8deac dea0: 84e1e9d0 834325d8 00006400 0000000b dfa8dea0 00000000 00000000 1ba52a29 dec0: 84e18b40 40946400 200000c0 200000c0 84e18b40 00000003 dfa8def4 dfa8dee8 dee0: 80797a54 1ba52a29 dfa8df14 40946400 00000000 84e18b41 200000c0 84e18b40 df00: 00000003 84150000 dfa8dfa4 dfa8df18 8056cd50 813a3bf4 ecac8b10 84150000 df20: dfa8df3c dfa8df30 81a39438 81a39308 dfa8df54 dfa8df40 8025e490 8028ef54 df40: dfa8dfb0 40000000 dfa8df84 dfa8df58 802229ec 8025e44c 00000000 8281cddc df60: dfa8dfb0 0014c820 ecac8b10 80222940 00000000 1ba52a29 dfa8dfac 00000000 df80: 00000000 002f6308 00000036 8020029c 84150000 00000036 00000000 dfa8dfa8 dfa0: 80200060 8056cc2c 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76f670bc dfe0: 76f66ec0 76f66eb0 0001948c 001322c0 60000010 00000003 00000000 00000000 Call trace: [<813ab46c>] (parport_attach) from [<813a7678>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1006) r6:840f9944 r5:81e15824 r4:829cf92c [<813a7570>] (comedi_device_attach) from [<813a31f8>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:84150000 r7:200000c0 r6:b5403587 r5:840f9900 r4:200000c0 [<813a30f8>] (do_devconfig_ioctl) from [<813a41c4>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2173) r8:84150000 r7:200000c0 r6:200000c0 r5:840f9900 r4:84e18b40 [<813a3be8>] (comedi_unlocked_ioctl) from [<8056cd50>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a3be8>] (comedi_unlocked_ioctl) from [<8056cd50>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a3be8>] (comedi_unlocked_ioctl) from [<8056cd50>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a3be8>] (comedi_unlocked_ioctl) from [<8056cd50>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:84150000 r9:00000003 r8:84e18b40 r7:200000c0 r6:84e18b41 r5:00000000 r4:40946400 [<8056cc20>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa8dfa8 to 0xdfa8dff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76f670bc dfe0: 76f66ec0 76f66eb0 0001948c 001322c0 r10:00000036 r9:84150000 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