8<--- cut here --- Unable to handle kernel paging request at virtual address fee0007c when write [fee0007c] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 7763 Comm: syz.3.832 Not tainted syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at __raw_writeb arch/arm/include/asm/io.h:99 [inline] PC is at parport_attach drivers/comedi/drivers/comedi_parport.c:291 [inline] PC is at parport_attach+0x184/0x1e0 drivers/comedi/drivers/comedi_parport.c:224 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:291 [inline] LR is at parport_attach+0x174/0x1e0 drivers/comedi/drivers/comedi_parport.c:224 pc : [<8147b434>] lr : [<8147b424>] psr: 60000013 sp : ea5c5d30 ip : ea5c5d30 fp : ea5c5d54 r10: 82d2c99c r9 : 00000003 r8 : 8311b840 r7 : ea5c5d90 r6 : 8311b840 r5 : 00000000 r4 : 00000000 r3 : fee0007c r2 : 81e2d3a8 r1 : 00000001 r0 : 8147b094 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85fcf840 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:1048 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 8311b840 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xea5c4000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2746 Register r8 information: slab kmalloc-192 start 8311b840 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 0xea5c4000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2746 Register r12 information: 2-page vmalloc region starting at 0xea5c4000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2746 Process syz.3.832 (pid: 7763, stack limit = 0xea5c4000) Stack: (0xea5c5d30 to 0xea5c6000) 5d20: 824cbcc0 8311b840 82bd64c4 82bd64c4 5d40: 81e2d868 00000000 ea5c5d8c ea5c5d58 81476fac 8147b2bc 40946400 00000000 5d60: ea5c5d7c 20000180 8311b840 b5403587 40946400 00000003 00000009 840055c0 5d80: ea5c5e4c ea5c5d90 814727b8 81476eb0 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 0000007c 00000006 00000000 0000000c 00000010 00000006 008007ff 5dc0: 00000c5b 00000005 00004100 00000004 00000002 00000001 0001ffff 00000002 5de0: 00000007 00000083 00000002 01000003 00001b14 00000018 00000000 ffffffff 5e00: fffffffb 0000000b 00000142 0000003b 00000010 10000406 00000660 fffffff8 5e20: 00000000 94a16f22 00000000 85c80800 8311b840 20000180 40946400 00000003 5e40: ea5c5f14 ea5c5e50 81473adc 814726f0 00000000 94a16f22 00000000 00000000 5e60: 8254080c ea5c5ea4 0000005f 84391c00 00000064 8311b870 ea5c5ee4 ea5c5e88 5e80: 80802de4 807f9114 00000064 00000001 00000000 ea5c5ea4 86855410 834f1bb0 5ea0: 00006400 0000000b ea5c5e98 00000000 00000000 94a16f22 00000000 85c80800 5ec0: 40946400 20000180 20000180 85c80800 00000009 840055c0 ea5c5ef4 ea5c5ee8 5ee0: 80802f18 94a16f22 ea5c5f14 00000000 85c80801 40946400 20000180 85c80800 5f00: 00000009 840055c0 ea5c5fa4 ea5c5f18 805b9f1c 81473794 ecac8b10 840055c0 5f20: ea5c5f3c ea5c5f30 81b3ded8 81b3dda4 ea5c5f54 ea5c5f40 8025a7e8 8028e4c0 5f40: ea5c5fb0 40000000 ea5c5f84 ea5c5f58 80220bdc 8025a7a4 00000000 82a1ea8c 5f60: ea5c5fb0 0013e9c0 ecac8b10 80220b30 00000000 94a16f22 ea5c5fac 00000000 5f80: 00000000 00346310 00000036 8020029c 840055c0 00000036 00000000 ea5c5fa8 5fa0: 80200060 805b9ce4 00000000 00000000 00000009 40946400 20000180 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f4a0dc 5fe0: 76f49e88 76f49e78 00018ebc 00130820 60000010 00000009 00000000 00000000 Call trace: [<8147b2b0>] (parport_attach) from [<81476fac>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e2d868 r4:82bd64c4 [<81476ea4>] (comedi_device_attach) from [<814727b8>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:840055c0 r9:00000009 r8:00000003 r7:40946400 r6:b5403587 r5:8311b840 r4:20000180 [<814726e4>] (do_devconfig_ioctl) from [<81473adc>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20000180 r5:8311b840 r4:85c80800 [<81473788>] (comedi_unlocked_ioctl) from [<805b9f1c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81473788>] (comedi_unlocked_ioctl) from [<805b9f1c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81473788>] (comedi_unlocked_ioctl) from [<805b9f1c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81473788>] (comedi_unlocked_ioctl) from [<805b9f1c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:840055c0 r9:00000009 r8:85c80800 r7:20000180 r6:40946400 r5:85c80801 r4:00000000 [<805b9cd8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea5c5fa8 to 0xea5c5ff0) 5fa0: 00000000 00000000 00000009 40946400 20000180 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f4a0dc 5fe0: 76f49e88 76f49e78 00018ebc 00130820 r10:00000036 r9:840055c0 r8:8020029c r7:00000036 r6:00346310 r5:00000000 r4:00000000 Code: e5963064 e3a04000 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e5963064 ldr r3, [r6, #100] @ 0x64 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